Title: Boston to Castries cheap flights from $286 (BOS to SLU) - Expedia.com ![](https://images.trvl-media.com/place/553248621533157962/427c3ca0-a24c-4935-aa2f-199315cd7f76.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/553248621533157962/427c3ca0-a24c-4935-aa2f-199315cd7f76.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # $286 Cheap Flights from Boston (BOS) to Castries (SLU) [View $286 flight on Sat, Jun 13, 2026](https://expedia.com/Flights-Search?trip=oneway&leg1=from:BOS,to:SLU,departure:6/13/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:285.07&airProductToken=AQqbAQoyCMGGARIDNzczGMGTASCYzgEorNCPAzCd0Y8DOEdAAFgBagVCQVNJQ3IIR05BMkE5QkEKMgjBhgESBDE4NDAYmM4BIMFBKKjYjwMw6NqPAzhLQAFYAWoFQkFTSUNyCEtMWURUMkJBCjEIyrIBEgM3NjYYwUEg8qIBKJfcjwMwxNyPAzhUQAFYAWoFQkFTSUNyCEtMWURUMkJBEgwIAhABGAIqAkFDMgAYASIECAEQASgCKAMoBDAB) ## Popular airlines from Logan International Airport (BOS) to George F. L. Charles Airport (SLU) - ![](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:BOS,to:SLU,departure:4/21/2026TANYT&leg2=from:SLU,to:BOS,departure:4/28/2026TANYT&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:BOS,to:SLU,departure:4/21/2026TANYT&leg2=from:SLU,to:BOS,departure:4/28/2026TANYT&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:BOS,to:SLU,departure:4/21/2026TANYT&leg2=from:SLU,to:BOS,departure:4/28/2026TANYT&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:BOS,to:SLU,departure:4/21/2026TANYT&leg2=from:SLU,to:BOS,departure:4/28/2026TANYT&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:BOS,to:SLU,departure:4/21/2026TANYT&leg2=from:SLU,to:BOS,departure:4/28/2026TANYT&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:BOS,to:SLU,departure:4/21/2026TANYT&leg2=from:SLU,to:BOS,departure:4/28/2026TANYT&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:BOS,to:SLU,departure:4/21/2026TANYT&leg2=from:SLU,to:BOS,departure:4/28/2026TANYT&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 Boston to Castries (BOS-SLU) Prices were available within the past 7 days and start at $286 for one-way flights and $647 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Air Canada](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AC.gif) Wed, Jun 3 - Mon, Jun 8 BOS Boston SLU Castries $647 Roundtrip found 5 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:BOS,to:SLU,departure:6/3/2026TANYT&leg2=from:SLU,to:BOS,departure:6/8/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:646.67&airProductToken=AQqbAQoyCMGGARIDNzY1GMGTASCYzgEo3-COAzDL4Y4DOEdAAFgBagVCQVNJQ3IIR05BMkE5QkEKMgjBhgESBDE4NDAYmM4BIMFBKOjnjgMwqOqOAzhLQAFYAWoFQkFTSUNyCEtMWURUMkJBCjEIyrIBEgM3NjYYwUEg8qIBKNfrjgMwhOyOAzhUQAFYAWoFQkFTSUNyCEtMWURUMkJBCpsBCjEIyrIBEgM3MTUY8qIBIMFBKIOWjwMwsJaPAzhUQABYAWoFQkFTSUNyCEtMWURUMkJBCjIIwYYBEgQxODQxGMFBIJjOASjkl48DMLiajwM4S0ABWAFqBUJBU0lDcghLTFlEVDJCQQoyCMGGARIDNzY2GJjOASDBkwEolZ-PAzD9n48DOEdAAVgBagVCQVNJQ3IIR05BMkE5QkESDAgCEAEYAioCQUMyABgBIgQIARABKAIoAygEMAE) ## Alternative airports near Castries Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.com/Flights-Search?leg1=from:BOS,to:UVF,departure:4/21/2026TANYT&leg2=from:UVF,to:BOS,departure:4/28/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) UVF Hewanorra Intl. Cheapest 53 min [Flights from $631 ](https://www.expedia.com/Flights-Search?leg1=from:BOS,to:UVF,departure:4/21/2026TANYT&leg2=from:UVF,to:BOS,departure:4/28/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) ## Frequently asked questions ### How much does a flight from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) cost? ### What is the cheapest month to fly from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### Which airlines fly direct from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### What is the cheapest airline that flies from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### How do I find cheap flights from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### What is the best airline to fly with from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### What is the best time to fly from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### What is the earliest flight from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### What are the most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### How long does it take to fly from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### Can you fly business or first class from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ### How do I earn miles on a Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) flight with Expedia? ### What airports do you fly into for Castries from Logan Intl. (BOS)? ### Is it cheaper to buy a plane ticket from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) at the last minute? ### Is it cheaper to book a Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles) flight and hotel package? ### Can I cancel or change the date of my flight from Boston, MA (BOS-Logan Intl.) to Castries (SLU-George F. L. Charles)? ## Travel information | Origin airport | Logan Intl. | | ------------------- | -------------------- | | Destination airport | George F. L. 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