Title: Cheap flights from Harrisburg to Islip (MDT to ISP) - Expedia.com ![Aerial South Shore Long Island During Sunset](https://images.trvl-media.com/place/1638/af7d1356-1b17-43db-b716-450cf420d6e9.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/1638/af7d1356-1b17-43db-b716-450cf420d6e9.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from Harrisburg (MDT) to Islip (ISP) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travelers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Harrisburg Intl. Airport (MDT) to MacArthur Airport (ISP) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.com/Flights-Search?leg1=from:MDT,to:ISP,departure:3/3/2026TANYT&leg2=from:ISP,to:MDT,departure:3/10/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.com/Flights-Search?leg1=from:MDT,to:ISP,departure:3/3/2026TANYT&leg2=from:ISP,to:MDT,departure:3/10/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WN.svg) Southwest Airlines [](https://www.expedia.com/Flights-Search?leg1=from:MDT,to:ISP,departure:3/3/2026TANYT&leg2=from:ISP,to:MDT,departure:3/10/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.com/Flights-Search?leg1=from:MDT,to:ISP,departure:3/3/2026TANYT&leg2=from:ISP,to:MDT,departure:3/10/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_F9.svg) Frontier Airlines [](https://www.expedia.com/Flights-Search?leg1=from:MDT,to:ISP,departure:3/3/2026TANYT&leg2=from:ISP,to:MDT,departure:3/10/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_B6.svg) JetBlue Airways [](https://www.expedia.com/Flights-Search?leg1=from:MDT,to:ISP,departure:3/3/2026TANYT&leg2=from:ISP,to:MDT,departure:3/10/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"B6"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AS.svg) Alaska Airlines [](https://www.expedia.com/Flights-Search?leg1=from:MDT,to:ISP,departure:3/3/2026TANYT&leg2=from:ISP,to:MDT,departure:3/10/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* - ![](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our OneKeyCash [Learn about One Key](https://www.expedia.com/welcome-one-key) ## Cheap Flights from Harrisburg to Islip (MDT-ISP) Prices were available within the past 7 days and start at for one-way flights and $937 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Tue, Feb 24 - Tue, Mar 3 MDT Harrisburg ISP Islip $937 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/24/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:936.40&airProductToken=AQpoCiEI1YIBEgQzNDc1GOyYASCuHCjRgYYDMOGChgM4VkAAWAEKIQjVggESBDE0OTEYrhwgwZMBKKGEhgMwsYWGAzhWQAFYAQogCLmWARIDMjE3GMGTASDIfCjahoYDMLCHhgM4QkABWAEKZwogCLmWARIDMjEyGMh8IMGTASiD0oYDMNjShgM4QkAAWAEKIAjVggESAzcyMRjBkwEgiBgoiNSGAzDw1IYDOEtAAVgBCiEI1YIBEgQ0OTg2GIgYIOyYASjP3IYDMI3dhgM4S0ABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Tue, Feb 24 - Tue, Mar 3 MDT Harrisburg ISP Islip $941 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/24/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:940.41&airProductToken=AQqXAQo0CNWCARIEMzQ3NRjsmAEgrhwo0YGGAzDhgoYDOFZAAFgBagdFQ09OT01ZcghWRkswQUZFTgo0CNWCARIEMTQ5MRiuHCDBkwEooYSGAzCxhYYDOFZAAVgBagdFQ09OT01ZcghWRkswQUZFTgopCLmWARIDMjE3GMGTASDIfCjahoYDMLCHhgM4QkABWAFqAkVScgNCSVAKlwEKKQi5lgESAzIxMhjIfCDBkwEog9KGAzDY0oYDOEJAAFgBagJFUnIDQklQCjQI1YIBEgQxNzMyGMGTASCuHCif04YDMNnUhgM4VkABWAFqB0VDT05PTVlyCFZGSzBBRkVOCjQI1YIBEgQzNjA2GK4cIOyYASil1oYDMJ_XhgM4VkABWAFqB0VDT05PTVlyCFZGSzBBRkVOEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwAQ) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Feb 27 - Tue, Mar 3 MDT Harrisburg ISP Islip $948 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/27/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:947.40&airProductToken=AQpoCiEI1YIBEgQyNjg0GOyYASCuHCixo4YDMLqkhgM4VkAAWAEKIQjVggESBDE0OTEYrhwgwZMBKIGmhgMwkaeGAzhWQAFYAQogCLmWARIDMjE3GMGTASDIfCi6qIYDMJCphgM4QkABWAEKZwogCLmWARIDMjEyGMh8IMGTASiD0oYDMNjShgM4QkAAWAEKIAjVggESAzcyMRjBkwEgiBgoiNSGAzDw1IYDOEtAAVgBCiEI1YIBEgQ0OTg2GIgYIOyYASjP3IYDMI3dhgM4S0ABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Tue, Feb 24 - Thu, Mar 5 MDT Harrisburg ISP Islip $952 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/24/2026TANYT&leg2=from:ISP,to:MDT,departure:3/5/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:951.41&airProductToken=AQpoCiEI1YIBEgQzNDc1GOyYASCuHCjRgYYDMOGChgM4VkAAWAEKIQjVggESBDE0OTEYrhwgwZMBKKGEhgMwsYWGAzhWQAFYAQogCLmWARIDMjE3GMGTASDIfCjahoYDMLCHhgM4QkABWAEKaAogCLmWARIDMjEyGMh8IMGTASjD6IYDMJjphgM4QkAAWAEKIQjVggESBDE3MzQYwZMBIIgYKOXxhgMwzfKGAzhWQAFYAQohCNWCARIENDk4NhiIGCDsmAEoivOGAzDI84YDOFZAAVgBEgoIARABGAEqAlVBGAEiBAgBEAEoBDAB) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Tue, Feb 24 - Tue, Mar 3 MDT Harrisburg ISP Islip $958 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/24/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:957.11&airProductToken=AQpfCjIIwYIBEgQ1OTM3GOyYASDBkwEorIKGAzCKg4YDOE5AAFgBagRNQUlOcghOMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCjahoYDMLCHhgM4QkABWAFqAkVScgNCSVAKkQEKKQi5lgESAzIxMhjIfCDBkwEog9KGAzDY0oYDOEJAAFgBagJFUnIDQklQCjEIwYIBEgQ0MzQwGMGTASDvWSjd1IYDMMbVhgM4TkABWAFqBE1BSU5yCE4wRldaTk4xCjEIwYIBEgQ1OTQ5GO9ZIOyYASju1YYDMKrWhgM4TkABWAFqBE1BSU5yCE4wRldaTk4xEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Tue, Feb 24 - Tue, Mar 3 MDT Harrisburg ISP Islip $963 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/24/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:962.41&airProductToken=AQqRAQoxCMGCARIENTg0MRjsmAEg71kom4OGAzDUg4YDOE5AAFgBagRNQUlOcghOMEZXWk5OMQoxCMGCARIENDQ4MRjvWSDBkwEohoWGAzDehYYDOE5AAVgBagRNQUlOcghOMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCjahoYDMLCHhgM4QkABWAFqAkVScgNCSVAKkQEKKQi5lgESAzIxMhjIfCDBkwEog9KGAzDY0oYDOEJAAFgBagJFUnIDQklQCjEIwYIBEgQ0MzQwGMGTASDvWSjd1IYDMMbVhgM4TkABWAFqBE1BSU5yCE4wRldaTk4xCjEIwYIBEgQ1OTQ5GO9ZIOyYASju1YYDMKrWhgM4TkABWAFqBE1BSU5yCE4wRldaTk4xEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Tue, Feb 24 - Tue, Mar 3 MDT Harrisburg ISP Islip $966 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/24/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:965.11&airProductToken=AQpfCjIIwYIBEgQ1OTM3GOyYASDBkwEorIKGAzCKg4YDOE5AAFgBagRNQUlOcghOMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCjahoYDMLCHhgM4QkABWAFqAkVScgNCSVAKkwEKKQi5lgESAzIxMhjIfCDBkwEog9KGAzDY0oYDOEJAAFgBagJFUnIDQklQCjIIwYIBEgQyNDkwGMGTASDimgEoi9OGAzCm1IYDOEdAAVgBagRNQUlOcghHMEZXVU5OMQoyCMGCARIENjAxNBjimgEg7JgBKOvVhgMw1daGAzhHQAFYAWoETUFJTnIIRzBGV1VOTjESCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAB) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Tue, Feb 24 - Tue, Mar 3 MDT Harrisburg ISP Islip $971 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/24/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:970.41&airProductToken=AQqRAQoxCMGCARIENTg0MRjsmAEg71kom4OGAzDUg4YDOE5AAFgBagRNQUlOcghOMEZXWk5OMQoxCMGCARIEMTY5NRjvWSDBkwEosoSGAzCFhYYDOE5AAVgBagRNQUlOcghOMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCjahoYDMLCHhgM4QkABWAFqAkVScgNCSVAKkwEKKQi5lgESAzIxMhjIfCDBkwEog9KGAzDY0oYDOEJAAFgBagJFUnIDQklQCjIIwYIBEgQyNDkwGMGTASDimgEoi9OGAzCm1IYDOEdAAVgBagRNQUlOcghHMEZXVU5OMQoyCMGCARIENjAxMxjimgEg7JgBKPbUhgMw4dWGAzhHQAFYAWoETUFJTnIIRzBGV1VOTjESCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAB) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Tue, Feb 24 - Tue, Mar 3 MDT Harrisburg ISP Islip $975 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/24/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:974.41&airProductToken=AQqdAQo3CMSYARIENTEwNBjsmAEg47QBKLSBhgMwm4KGAzhYQABYAWoJTUFJTkNMQVNDcghYRjBOSDNNTAo3CMSYARIEMjY0OBjjtAEgwZMBKLODhgMwtISGAzhYQAFYAWoJTUFJTkNMQVNDcghYRjBOSDNNTAopCLmWARIDMjE3GMGTASDIfCjahoYDMLCHhgM4QkABWAFqAkVScgNCSVAKnQEKKQi5lgESAzIxMhjIfCDBkwEog9KGAzDY0oYDOEJAAFgBagJFUnIDQklQCjcIxJgBEgQxNDMyGMGTASDjtAEoptWGAzC01oYDOFhAAVgBaglNQUlOQ0xBU0NyCFhGME5IM01MCjcIxJgBEgQ1MTQxGOO0ASDsmAEotteGAzCQ2IYDOFhAAVgBaglNQUlOQ0xBU0NyCFhGME5IM01MEgoIARABGAEqAkRMGAEiBAgBEAEoAigDKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Mon, Mar 2 - Mon, Mar 9 MDT Harrisburg ISP Islip $979 Roundtrip found 13 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:3/2/2026TANYT&leg2=from:ISP,to:MDT,departure:3/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:978.11&airProductToken=AQpfCjIIwYIBEgQ1OTM3GOyYASDBkwEo7MWGAzDKxoYDOFNAAFgBagRNQUlOcghTMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCiayoYDMPDKhgM4QkABWAFqAkVScgNCSVAKkwEKKQi5lgESAzIxMhjIfCDBkwEoh5WHAzDclYcDOEJAAFgBagJFUnIDQklQCjIIwYIBEgQyMDMzGMGTASDimgEoypiHAzDumYcDOE5AAVgBagRNQUlOcghOMEZXWk5OMQoyCMGCARIENjA2NBjimgEg7JgBKIubhwMw85uHAzhOQAFYAWoETUFJTnIITjBGV1pOTjESCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Wed, Feb 25 - Tue, Mar 3 MDT Harrisburg ISP Islip $997 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/25/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:996.40&airProductToken=AQpoCiEI1YIBEgQzNDc1GOyYASCuHCjxjIYDMIGOhgM4VkAAWAEKIQjVggESBDE0OTEYrhwgwZMBKMGPhgMw0ZCGAzhWQAFYAQogCLmWARIDMjE3GMGTASDIfCj6kYYDMNCShgM4U0ABWAEKZwogCLmWARIDMjEyGMh8IMGTASiD0oYDMNjShgM4QkAAWAEKIAjVggESAzcyMRjBkwEgiBgoiNSGAzDw1IYDOEtAAVgBCiEI1YIBEgQ0OTg2GIgYIOyYASjP3IYDMI3dhgM4S0ABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Fri, Feb 27 - Sun, Mar 1 MDT Harrisburg ISP Islip $1,001 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/27/2026TANYT&leg2=from:ISP,to:MDT,departure:3/1/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1000.11&airProductToken=AQpfCjIIwYIBEgQ1OTM3GOyYASDBkwEojKSGAzDqpIYDOE5AAFgBagRNQUlOcghOMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCi6qIYDMJCphgM4QkABWAFqAkVScgNCSVAKkQEKKQi5lgESAzIxMhjIfCDBkwEow7uGAzCYvIYDOEJAAFgBagJFUnIDQklQCjEIwYIBEgQxNjk1GMGTASDvWSjTvYYDMLK-hgM4R0ABWAFqBE1BSU5yCEcwRldaTk4xCjEIwYIBEgQ1OTQ5GO9ZIOyYASiuv4YDMOq_hgM4R0ABWAFqBE1BSU5yCEcwRldaTk4xEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwAQ) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Sat, Feb 21 - Sat, Feb 28 MDT Harrisburg ISP Islip $1,004 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/21/2026TANYT&leg2=from:ISP,to:MDT,departure:2/28/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1003.41&airProductToken=AQpqCiIIxJgBEgQ1MTA0GOyYASDjtAEo1N-FAzC74IUDOFRAAFgBCiIIxJgBEgQyNjQ4GOO0ASDBkwEo0-GFAzDU4oUDOFRAAVgBCiAIuZYBEgMyMTcYwZMBIMh8KPrkhQMw0OWFAzhCQAFYAQpqCiAIuZYBEgMyMTIYyHwgwZMBKKOwhgMw-LCGAzhCQABYAQoiCMSYARIEMTQzMhjBkwEg47QBKMazhgMw1LSGAzhYQAFYAQoiCMSYARIENTE0MRjjtAEg7JgBKNa1hgMwsLaGAzhYQAFYARIKCAEQARgBKgJETBgBIgQIARABKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Mon, Mar 2 - Mon, Mar 9 MDT Harrisburg ISP Islip $1,006 Roundtrip found 13 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:3/2/2026TANYT&leg2=from:ISP,to:MDT,departure:3/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1005.41&airProductToken=AQqRAQoxCMGCARIENTg0MRjsmAEg71ko1saGAzCPx4YDOEdAAFgBagRNQUlOcghHMEZXWk5OMQoxCMGCARIEMTY5NRjvWSDBkwEo8seGAzDFyIYDOEdAAVgBagRNQUlOcghHMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCiayoYDMPDKhgM4QkABWAFqAkVScgNCSVAKkwEKKQi5lgESAzIxMhjIfCDBkwEoh5WHAzDclYcDOEJAAFgBagJFUnIDQklQCjIIwYIBEgQyMDMzGMGTASDimgEoypiHAzDumYcDOE5AAVgBagRNQUlOcghOMEZXWk5OMQoyCMGCARIENjA2NBjimgEg7JgBKIubhwMw85uHAzhOQAFYAWoETUFJTnIITjBGV1pOTjESCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAB) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Sun, Feb 22 - Tue, Mar 3 MDT Harrisburg ISP Islip $1,008 Roundtrip found 6 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/22/2026TANYT&leg2=from:ISP,to:MDT,departure:3/3/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1007.40&airProductToken=AQpoCiEI1YIBEgQyNjg0GOyYASCuHCiR64UDMJrshQM4VkAAWAEKIQjVggESBDEwNDQYrhwgwZMBKPXshQMwiu6FAzhWQAFYAQogCLmWARIDMjE3GMGTASDIfCia8IUDMPDwhQM4U0ABWAEKZwogCLmWARIDMjEyGMh8IMGTASiD0oYDMNjShgM4QkAAWAEKIAjVggESAzcyMRjBkwEgiBgoiNSGAzDw1IYDOEtAAVgBCiEI1YIBEgQ0OTg2GIgYIOyYASjP3IYDMI3dhgM4S0ABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Feb 27 - Sun, Mar 1 MDT Harrisburg ISP Islip $1,032 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/27/2026TANYT&leg2=from:ISP,to:MDT,departure:3/1/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1031.41&airProductToken=AQqXAQo0CNWCARIEMjY4NBjsmAEgrhwosaOGAzC6pIYDOFZAAFgBagdFQ09OT01ZcghWRkEwQUZFTgo0CNWCARIEMTA0NBiuHCDBkwEolaWGAzCqpoYDOFZAAVgBagdFQ09OT01ZcghWRkEwQUZFTgopCLmWARIDMjE3GMGTASDIfCi6qIYDMJCphgM4QkABWAFqAkVScgNCSVAKlwEKKQi5lgESAzIxMhjIfCDBkwEow7uGAzCYvIYDOEJAAFgBagJFUnIDQklQCjQI1YIBEgQxNzMyGMGTASCuHCjfvIYDMJi-hgM4SEABWAFqB0VDT05PTVlyCEhGQTBBRkVOCjQI1YIBEgQxNTgzGK4cIOyYASjlv4YDMNTAhgM4SEABWAFqB0VDT05PTVlyCEhGQTBBRkVOEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Mon, Mar 2 - Mon, Mar 9 MDT Harrisburg ISP Islip $1,048 Roundtrip found 13 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:3/2/2026TANYT&leg2=from:ISP,to:MDT,departure:3/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1047.11&airProductToken=AQpfCjIIwYIBEgQ1OTM3GOyYASDBkwEo7MWGAzDKxoYDOFNAAFgBagRNQUlOcghTMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCiayoYDMPDKhgM4QkABWAFqAkVScgNCSVAKkQEKKQi5lgESAzIxMhjIfCDBkwEoh5WHAzDclYcDOEJAAFgBagJFUnIDQklQCjEIwYIBEgQzMDQ0GMGTASDvWSi7locDMJqXhwM4VkABWAFqBE1BSU5yCFYwRldaTk4xCjEIwYIBEgQ1OTQ5GO9ZIOyYASiBmYcDML2ZhwM4VkABWAFqBE1BSU5yCFYwRldaTk4xEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Fri, Feb 27 - Sun, Mar 1 MDT Harrisburg ISP Islip $1,054 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:2/27/2026TANYT&leg2=from:ISP,to:MDT,departure:3/1/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1053.12&airProductToken=AQpfCjIIwYIBEgQ1OTM3GOyYASDBkwEojKSGAzDqpIYDOE5AAFgBagRNQUlOcghOMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCi6qIYDMJCphgM4QkABWAFqAkVScgNCSVAKkwEKKQi5lgESAzIxMhjIfCDBkwEow7uGAzCYvIYDOEJAAFgBagJFUnIDQklQCjIIwYIBEgQxNDk1GMGTASDimgEohr-GAzCqwIYDOExAAVgBagRNQUlOcghMMEZXWk5OMQoyCMGCARIENjA2NBjimgEg7JgBKMfBhgMwr8KGAzhMQAFYAWoETUFJTnIITDBGV1pOTjESCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAB) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Mon, Mar 2 - Mon, Mar 9 MDT Harrisburg ISP Islip $1,059 Roundtrip found 13 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:3/2/2026TANYT&leg2=from:ISP,to:MDT,departure:3/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1058.42&airProductToken=AQqRAQoxCMGCARIENTg0MRjsmAEg71ko1saGAzCPx4YDOExAAFgBagRNQUlOcghMMEZXWk5OMQoxCMGCARIENDQ4MRjvWSDBkwEoxsiGAzCeyYYDOExAAVgBagRNQUlOcghMMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCiayoYDMPDKhgM4QkABWAFqAkVScgNCSVAKkQEKKQi5lgESAzIxMhjIfCDBkwEoh5WHAzDclYcDOEJAAFgBagJFUnIDQklQCjEIwYIBEgQxNzc2GMGTASDvWSidmYcDMIKahwM4TkABWAFqBE1BSU5yCE4wRldaTk4xCjEIwYIBEgQ1ODEyGO9ZIOyYASirmocDMOaahwM4TkABWAFqBE1BSU5yCE4wRldaTk4xEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Mon, Mar 2 - Mon, Mar 9 MDT Harrisburg ISP Islip $1,075 Roundtrip found 13 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:MDT,to:ISP,departure:3/2/2026TANYT&leg2=from:ISP,to:MDT,departure:3/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1074.11&airProductToken=AQpfCjIIwYIBEgQ1OTM3GOyYASDBkwEo7MWGAzDKxoYDOFNAAFgBagRNQUlOcghTMEZXWk5OMQopCLmWARIDMjE3GMGTASDIfCiayoYDMPDKhgM4QkABWAFqAkVScgNCSVAKkAEKKQi5lgESAzIxMhjIfCDBkwEoh5WHAzDclYcDOEJAAFgBagJFUnIDQklQCjAIwYIBEgM4NzcYwZMBIO9ZKKCXhwMw_5eHAzhMQAFYAWoETUFJTnIITDBGV1pOTjEKMQjBggESBDU5NDkY71kg7JgBKIGZhwMwvZmHAzhMQAFYAWoETUFJTnIITDBGV1pOTjESCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAB) ![](https://forever.travel-assets.com/flex/flexmanager/images/2026/02/06/expedia-sale-2026-desktop-us-ca.jpg?impolicy=fcrop&w=1400&h=600&q=mediumHigh) ## The Annual Vacation Sale Members save up to 40% on hotels and homes. Plan this year’s big trip and save. [Book now](https://expedia.com/deals?rfrr=FTG_SPRING_PROMO_) ## Frequently asked questions ### How much does a flight from Harrisburg Intl. Airport (MDT) to MacArthur Airport (ISP) cost? ### What is the cheapest month to fly from Harrisburg Intl. Airport (MDT) to MacArthur Airport (ISP)? ### What is the cheapest airline that flies from Harrisburg Intl. Airport (MDT) to MacArthur Airport (ISP)? ### How many flights per day from Harrisburg Intl. Airport (MDT) to MacArthur Airport (ISP)? ### What day of the week has the most flights from MDT to ISP? ### What is the best time to fly from Harrisburg Intl. Airport (MDT) to MacArthur Airport (ISP)? ### Is it cheaper to buy a plane ticket from Harrisburg Intl. Airport (MDT) to MacArthur Airport (ISP) last-minute? ### Is it cheaper to book a MDT to ISP flight and hotel package? ### Can I cancel or change the date of my flight from Harrisburg Intl. Airport (MDT) to MacArthur Airport (ISP)? ## Travel information | Origin airport | Harrisburg Intl. | | ------------------- | ---------------- | | Destination airport | MacArthur | | Roundtrip price | $936 | | Distance | 196 mi | ## Book with confidence # Harrisburg to Islip Flights The cheapest times to fly from Harrisburg to Islip On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Harrisburg to Islip are during the month of February. You can find some of the cheapest flights from Harrisburg to Islip with Expedia's search tool and vast selection of airlines. The best time to book a flight from Harrisburg to Islip Sunday is one of the best days to book for cheap flights from Harrisburg to Islip: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance. How to find cheap round-trip tickets from Harrisburg to Islip Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Harrisburg to Islip in 2026\. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference\*. This is available for a small fee, and is free to One Key Gold and Platinum tier members. Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Harrisburg to Islip flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps. You could also save big by booking one of Expedia's [vacation packages](https://www.expedia.com/package-deals). Bundling together your Harrisburg to Islip airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures. \*Terms apply. Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023\. The percentages you see are averages. \*Flight schedules are subject to change. ## Explore a world of travel with Expedia - Lodging - Flights - Packages - Cars - Vacation Rentals - [New York Hotels ](https://www.expedia.com/New-York-Hotels.d178293.Travel-Guide-Hotels) - [Long Island Hotels ](https://www.expedia.com/Long-Island-Hotels.d602887.Travel-Guide-Hotels) - [Hotels near Bohemia Historical Society Museum ](https://www.expedia.com/Bohemia-Historical-Society-Museum-Hotels.0-l553248621554204748-0.Travel-Guide-Filter-Hotels) - [Cheap Hotels in Long Island ](https://www.expedia.com/Long-Island-Hotels-Cheap-Hotels.0-0-d602887-tCheapHotels.Travel-Guide-Filter-Hotels) - [Hotels near Ronkonkoma Station ](https://www.expedia.com/Ronkonkoma-Station-Hotels.d6186166.Travel-Guide-Hotels) - [Motels in Ronkonkoma Station ](https://www.expedia.com/Ronkonkoma-Station-Motels.d6186166-aaMotels.Travel-Guide-Accommodation) - [Oceanfront Hotels in Long Island ](https://www.expedia.com/Long-Island-Hotels-Oceanfront-Hotels.0-0-d602887-tOceanfrontHotels.Travel-Guide-Filter-Hotels) - 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