Title: CA $175 Cheap American Airlines fights from St. Louis to Washington - Expedia.ca ![Washington DC in Spring](https://images.trvl-media.com/place/3763/58eb1a51-e7f1-4f17-88af-21174d495e42.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/3763/58eb1a51-e7f1-4f17-88af-21174d495e42.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # CA $175 Cheap American Airlines fights from St. Louis (STL) to Washington (WAS) [View CA $175 flight on Sat, Jan 24, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:STL,to:IAD,departure:24/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:174.10&airProductToken=AQpoCjIIwYIBEgQ1NjE0GPJcIOKaASiRp4MDMIaogwM4QkAAWAFqBUJBU0lDcghRVkFXVVNCWgoyCMGCARIENTMxNxjimgEgiBgonamDAzD4qYMDOEJAAVgBagVCQVNJQ3IIUVZBV1VTQloSCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAL) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers 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 - ![notification illustration](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\* - ![deals illustration](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\* - ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## American Airlines flights from St. Louis to Washington (STL→WAS) Prices were available within the past 7 days and start at CA $175 for one-way flights and CA $349 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Sat, Jan 24 - Tue, Jan 27 STL St. Louis IAD Washington CA $349 Roundtrip found 23 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:IAD,departure:24/01/2026TANYT&leg2=from:IAD,to:STL,departure:27/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:348.10&airProductToken=AQpoCjIIwYIBEgQyNDg2GPJcIOKaASjiqYMDMNCqgwM4QkAAWAFqBUJBU0lDcghRVkFXVVNCWgoyCMGCARIEMzE0NhjimgEgiBgoo6yDAzD6rIMDOEJAAVgBagVCQVNJQ3IIUVZBV1VTQloKaAoyCMGCARIENTU0MxiIGCDimgEo4MmDAzDByoMDOEJAAFgBagVCQVNJQ3IIUVZBV1VTQloKMgjBggESBDI5MzcY4poBIPJcKOHLgwMw4syDAzhCQAFYAWoFQkFTSUNyCFFWQVdVU0JaEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwCw) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Sat, Jan 17 - Tue, Jan 20 STL St. Louis IAD Washington CA $395 Roundtrip found 23 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:IAD,departure:17/01/2026TANYT&leg2=from:IAD,to:STL,departure:20/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:394.10&airProductToken=AQpmCjEIwYIBEgQyNDg2GPJcIOKaASiC24IDMPDbggM4UUAAWAFqBE1BSU5yCFFWQVdVU00xCjEIwYIBEgQzMTQ2GOKaASCIGCjD3YIDMJreggM4UUABWAFqBE1BSU5yCFFWQVdVU00xEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwCw) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Sat, Jan 24 - Tue, Jan 27 STL St. Louis IAD Washington CA $396 Roundtrip found 23 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:IAD,departure:24/01/2026TANYT&leg2=from:IAD,to:STL,departure:27/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:395.21&airProductToken=AQpoCjIIwYIBEgQxMjUwGPJcIOKaASiQpYMDMIamgwM4QkAAWAFqBUJBU0lDcghOVkFJWlNCWgoyCMGCARIENTU0MxjimgEgiBgog6eDAzDgp4MDOEJAAVgBagVCQVNJQ3IITlZBSVpTQloSCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAL) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Sat, Jan 17 - Tue, Jan 20 STL St. Louis BWI Baltimore CA $403 Roundtrip found 23 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:BWI,departure:17/01/2026TANYT&leg2=from:BWI,to:STL,departure:20/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:402.90&airProductToken=AQpoCjIIwYIBEgQyNDg2GPJcIOKaASiC24IDMPDbggM4QkAAWAFqBUJBU0lDcghOVkFJWFNCWAoyCMGCARIEMjc5ORjimgEgwUUozd2CAzCe3oIDOEJAAVgBagVCQVNJQ3IITlZBSVhTQlgKZgoxCMGCARIEMzg0ORjBRSCuHCjU94IDMOr4ggM4QkAAWAFqBUJBU0lDcghPN0FXWlNCWgoxCMGCARIEMzc2NBiuHCDyXCjN-4IDMKL8ggM4QkABWAFqBUJBU0lDcghPVkFJS1NCWBIKCAEQARgBKgJBQRgBIgQIARABKAIoAygEMAs) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Sat, Jan 17 - Tue, Jan 20 STL St. Louis BWI Baltimore CA $409 Roundtrip found 23 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:BWI,departure:17/01/2026TANYT&leg2=from:BWI,to:STL,departure:20/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:408.30&airProductToken=AQpoCjIIwYIBEgQyNDc1GPJcIOKaASi114IDMKvYggM4QkAAWAFqBUJBU0lDcghOVkFJWFNCWAoyCMGCARIEMjMxNhjimgEgwUUo-9iCAzDQ2YIDOEJAAVgBagVCQVNJQ3IITlZBSVhTQlgKaAoyCMGCARIEMTQ2NBjBRSDimgEojfqCAzDv-oIDOEJAAFgBagVCQVNJQ3IITlZBSUtTQlgKMgjBggESBDI0ODYY4poBIPJcKLP7ggMwsPyCAzhCQAFYAWoFQkFTSUNyCE5WQUlLU0JYEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwCw) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Sat, Jan 17 - Tue, Jan 20 STL St. Louis IAD Washington CA $428 Roundtrip found 23 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:IAD,departure:17/01/2026TANYT&leg2=from:IAD,to:STL,departure:20/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:427.81&airProductToken=AQpoCjIIwYIBEgQxMjUwGPJcIOKaASiw1oIDMKbXggM4QkAAWAFqBUJBU0lDcghHVkFJWFNCWgoyCMGCARIENTU0MxjimgEgiBgoo9iCAzCA2YIDOEJAAVgBagVCQVNJQ3IIR1ZBSVhTQloSCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAL) ## Find the cheapest month to fly from St. Louis (STL) to Washington (WAS) ### August is typically the cheapest month to fly From CA $182 - CA $545 per traveller. ## Alternative airports near Washington Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:BWI,departure:11/01/2026TANYT&leg2=from:BWI,to:STL,departure:23/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) BWI Baltimore Washington Intl. Thurgood Marshall Cheapest 40 min [Flights from CA $500 ](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:BWI,departure:11/01/2026TANYT&leg2=from:BWI,to:STL,departure:23/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:IAD,departure:11/01/2026TANYT&leg2=from:IAD,to:STL,departure:27/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) IAD Washington Dulles Intl. 36 min [Flights from CA $509 ](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:IAD,departure:11/01/2026TANYT&leg2=from:IAD,to:STL,departure:27/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) ## Travel information | Origin airport | Lambert-St. Louis Intl. | | ------------------- | ----------------------- | | Destination airport | Washington Dulles Intl. | | Distance | 1111 km | \*Available to Expedia members.