Title: Cheap flights from Islip to Southampton (ISP to SOU) - Expedia.com ![](https://images.trvl-media.com/place/3245/acf3792e-6d54-4d71-86cf-feb4fa305abd.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/3245/acf3792e-6d54-4d71-86cf-feb4fa305abd.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from Islip (ISP) to Southampton (SOU) ## Popular airlines from MacArthur Airport (ISP) to Southampton (SOU) - ![](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:ISP,to:SOU,departure:3/7/2026TANYT&leg2=from:SOU,to:ISP,departure:3/14/2026TANYT&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:ISP,to:SOU,departure:3/7/2026TANYT&leg2=from:SOU,to:ISP,departure:3/14/2026TANYT&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:ISP,to:SOU,departure:3/7/2026TANYT&leg2=from:SOU,to:ISP,departure:3/14/2026TANYT&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:ISP,to:SOU,departure:3/7/2026TANYT&leg2=from:SOU,to:ISP,departure:3/14/2026TANYT&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:ISP,to:SOU,departure:3/7/2026TANYT&leg2=from:SOU,to:ISP,departure:3/14/2026TANYT&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:ISP,to:SOU,departure:3/7/2026TANYT&leg2=from:SOU,to:ISP,departure:3/14/2026TANYT&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:ISP,to:SOU,departure:3/7/2026TANYT&leg2=from:SOU,to:ISP,departure:3/14/2026TANYT&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 Islip to Southampton (ISP-SOU) Prices were available within the past 7 days and start at for one-way flights and $2,109 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![JetBlue Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/b6.gif) Sun, Apr 5 - Sun, Apr 12 ISP Islip SOU Southampton $2,109 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:ISP,to:SOU,departure:4/5/2026TANYT&leg2=from:SOU,to:ISP,departure:4/12/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:2108.80&airProductToken=AQqGAQosCMJsEgM1NDcYyHwgzHAoo8aJAzDSx4kDOEJAAFgBagJBTnIIQkkwQVVFWTUKKQjFkgESAzEyMBjMcCCDDSi_yYkDMLTNiQM4UUABWAFyCFFMWDJDMU01CisIxZIBEgQzMzAwGIMNINKjASjI14kDMKzYiQM4UUABWAFyCFFTWDFGTFhHCoYBCisIxZIBEgQzMzAxGNKjASCDDSjqkIoDMM6RigM4R0AAWAFyCEdTVzFGTFhHCikIxZIBEgMxMjEYgw0gzHAogpOKAzC3l4oDOFFAAVgBcghRTFcyQzFNNQosCMJsEgM1NDYYzHAgyHwolp2KAzC1nooDOFFAAVgBagJBTnIIUUkwSlVFWTUSCggBEAEYASoCRUkYASIECAEQASgCKAMoBDAB) ![](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 MacArthur Airport (ISP) to Southampton Airport (SOU) cost? ### What is the cheapest month to fly from MacArthur Airport (ISP) to Southampton Airport (SOU)? ### What is the cheapest airline that flies from MacArthur Airport (ISP) to Southampton Airport (SOU)? ### How many flights per day from MacArthur Airport (ISP) to Southampton Airport (SOU)? ### What day of the week has the most flights from ISP to SOU? ### What is the best time to fly from MacArthur Airport (ISP) to Southampton Airport (SOU)? ### Is it cheaper to buy a plane ticket from MacArthur Airport (ISP) to Southampton Airport (SOU) last-minute? ### Is it cheaper to book an ISP to SOU flight and hotel package? ### Can I cancel or change the date of my flight from MacArthur Airport (ISP) to Southampton Airport (SOU)? ## Travel information | Origin airport | MacArthur | | ------------------- | ----------- | | Destination airport | Southampton | | Roundtrip price | $2,109 | | Distance | 3381 mi | ## Book with confidence # Islip to Southampton Flights The cheapest times to fly from Islip to Southampton 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 Islip to Southampton are during the month of April. You can find some of the cheapest flights from Islip to Southampton with Expedia's search tool and vast selection of airlines. The best time to book a flight from Islip to Southampton Sunday is one of the best days to book for cheap flights from Islip to Southampton: 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 Islip to Southampton 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 Islip to Southampton 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 Islip to Southampton 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 Islip to Southampton 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\. 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