Title: $28 Cheap flights from O'Fallon, MO - Expedia.com ![](https://a.travel-assets.com/travel-assets-manager/fallback-images-brand/bex_flights_v2.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # $28 Cheap flights from O'Fallon, MO [View $28 flight on Sat, May 9, 2026](https://expedia.com/Flights-Search?trip=oneway&leg1=from:STL,to:DEN,departure:5/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:27.98&airProductToken=AQowCi4IxnISBDQ1NjcY8lwgg2koyMiMAzDhyYwDOEVAAFgBagRQQ18xcgdLMjFTWFMyEgoIARABGAEqAkY5GAEiBAgBEAEoAigDMA0) - [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 [O'Fallon Travel Guide](https://expedia.com/OFallon.dx140195)[Hotels in O'Fallon](https://expedia.com/OFallon-Hotels.d140195.Travel-Guide-Hotels)[Car Rentals in O'Fallon](https://expedia.com/Car-Rentals-In-OFallon.d140195.Car-Rental-Guide)[O'Fallon Vacation Packages](https://expedia.com/OFallon.d140195.Destination-Travel-Guides) ## Popular airlines from O'Fallon - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WN.svg) Southwest Airlines - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_F9.svg) Frontier Airlines - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AS.svg) Alaska Airlines - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada - ![](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) ## Today's featured flight deals from O'Fallon Nonstop Carry-on included Lower price than typical - St. Louis (STL)Phoenix (PHX) Sat, Mar 14 Sat, Mar 21 ![Southwest Airlines](https://a.travel-assets.com/air/airlines/wn_sq.svg)Southwest Airlines • Nonstop --- 6-day trip found 5 hours ago 35% less than typical $418 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:PHX,departure:3/14/2026TANYT&leg2=from:PHX,to:STL,departure:3/21/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-6f7f07ee71014e9b9a9102d619161541-1292-2~8.S.1~AQoCCAESBwjUBBABGAEoAlgCcAB6A2Jmc4gBg_fdXJABK6oBBwoDU1RMEACyAQcKA1BIWBAA~AQoxCi8I15wBEgQxNTAzGPJcIO-5ASib04cDMOjUhwM4VEAAWAFqA1dHQXIHVEROMFcyRgphCi8I15wBEgQzNDM3GO-5ASDMQCium4gDML-ciAM4WkAAWAFqA1dHQXIHWlhBVk4yRgouCNecARIEMzgyNBjMQCDyXCiVoIgDMNagiAM4WkABWAFqA1dHQXIHWlhBVk4yRhIKCAIQARgCKgJXThgBIgQIARABKAIoAygEMAE&medianPrice=863.00&displayPrice=417.39&src=dflp) - St. Louis (STL)Phoenix (PHX) Mon, Mar 16 Sat, Mar 21 ![Southwest Airlines](https://a.travel-assets.com/air/airlines/wn_sq.svg)Southwest Airlines • Nonstop --- 4-day trip found 1 hour ago 35% less than typical $410 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:PHX,departure:3/16/2026TANYT&leg2=from:PHX,to:STL,departure:3/21/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-5b3b32ef13b547bba11f9992c7857884-824-2~8.S.1~AQoGCAEQ2vYSEgcI1AQQARgBKAJYAnAAegNiZnOIAcLc3lyqAQcKA1NUTBAAsgEHCgNQSFgQAA~AQoxCi8I15wBEgQzNTg4GPJcIO-5ASje6IcDMLDqhwM4RUAAWAFqA1dHQXIHRUxOMFcyRgphCi8I15wBEgQzNDM3GO-5ASDMQCium4gDML-ciAM4RUAAWAFqA1dHQXIHRURBMFcyRgouCNecARIEMzgyNBjMQCDyXCiVoIgDMNagiAM4RUABWAFqA1dHQXIHRURBMFcyRhIKCAIQARgCKgJXThgBIgQIARABKAIoAygEMAE&medianPrice=830.00&displayPrice=409.21&src=dflp) - St. Louis (STL)Phoenix (PHX) Mon, Mar 16 Sat, Mar 21 ![Southwest Airlines](https://a.travel-assets.com/air/airlines/wn_sq.svg)Southwest Airlines • Nonstop --- 4-day trip found 1 hour ago 35% less than typical $410 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:PHX,departure:3/16/2026TANYT&leg2=from:PHX,to:STL,departure:3/21/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-0177053926134696931d3111ba272308-2452-2~8.S.1~AQoGCAEQ2vYSEgcI1AQQARgBKAJYAnAAegNiZnOIAcLc3lyqAQcKA1NUTBAAsgEHCgNQSFgQAA~AQoxCi8I15wBEgQxNTAzGPJcIO-5ASjl6YcDMLfrhwM4RUAAWAFqA1dHQXIHRUxOMFcyRgphCi8I15wBEgQzNDM3GO-5ASDMQCium4gDML-ciAM4RUAAWAFqA1dHQXIHRURBMFcyRgouCNecARIEMzgyNBjMQCDyXCiVoIgDMNagiAM4RUABWAFqA1dHQXIHRURBMFcyRhIKCAIQARgCKgJXThgBIgQIARABKAIoAygEMAE&medianPrice=830.00&displayPrice=409.21&src=dflp) - St. Louis (STL)Los Angeles (LAX) Wed, Mar 4 Mon, Mar 9 ![American Airlines](https://a.travel-assets.com/air/airlines/aa_sq.svg)American Airlines • Nonstop --- 5-day trip found 8 hours ago 30% less than typical $425 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:LAX,departure:3/4/2026TANYT&leg2=from:LAX,to:STL,departure:3/9/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-d18f2c2ad58945b8a4c80d44f563f826-586-1~8.S.1~AQoCCAESBwjUBBABGAEoAlgCcAB6A2Jmc4gB3pvdXKoBBwoDU1RMEACyAQcKA0xBWBAA~AQo0CjIIwYIBEgQ2MTk1GPJcIIu4ASiW3IYDMJ7ehgM4QkAAWAFqBUJBU0lDcghTMEZXVU5CWAppCjMIwYIBEgQyMTU5GIu4ASCjsQEog52HAzDFnocDOEJAAFgBagVCQVNJQ3IIUzBGV1pOQloKMgjBggESBDI4OTcYo7EBIPJcKLifhwMwo6CHAzhCQAFYAWoFQkFTSUNyCFMwRldaTkJaEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwCw&medianPrice=776.00&displayPrice=424.60&src=dflp) - St. Louis (STL)Los Angeles (LAX) Wed, Mar 11 Sun, Mar 15 ![American Airlines](https://a.travel-assets.com/air/airlines/aa_sq.svg)American Airlines • Nonstop --- 3-day trip found 4 hours ago 30% less than typical $425 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:LAX,departure:3/11/2026TANYT&leg2=from:LAX,to:STL,departure:3/15/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-23dd5c1b878948c29e5612a73a937711-824-1~8.S.1~AQoCCAESBwjUBBABGAEoAlgCcAB6A2Jmc4gBjJHeXKoBBwoDU1RMEACyAQcKA0xBWBAA~AQo0CjIIwYIBEgQ2MjE2GPJcIIu4ASi6qocDMMKshwM4QkAAWAFqBUJBU0lDcghTMEZXVU5CWAppCjMIwYIBEgQyMDc5GIu4ASCjsQEo79WHAzCo14cDOEJAAFgBagVCQVNJQ3IIUzBGV1pOQloKMgjBggESBDI4OTcYo7EBIPJcKNjXhwMww9iHAzhCQAFYAWoFQkFTSUNyCFMwRldaTkJaEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwCw&medianPrice=763.00&displayPrice=424.60&src=dflp) - St. Louis (STL)Los Angeles (LAX) Wed, Mar 11 Sun, Mar 15 ![American Airlines](https://a.travel-assets.com/air/airlines/aa_sq.svg)American Airlines • Nonstop --- 3-day trip found 4 hours ago 30% less than typical $425 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:LAX,departure:3/11/2026TANYT&leg2=from:LAX,to:STL,departure:3/15/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-18ba49e7d6494ed8a627b155869331bf-281-1~8.S.1~AQoCCAESBwjUBBABGAEoAlgCcAB6A2Jmc4gBupDeXKoBBwoDU1RMEACyAQcKA0xBWBAA~AQo0CjIIwYIBEgQ2MjE2GPJcIIu4ASi6qocDMMKshwM4QkAAWAFqBUJBU0lDcghTMEZXVU5CWAppCjMIwYIBEgQyMDU2GIu4ASCjsQEowtWHAzD51ocDOEJAAFgBagVCQVNJQ3IIUzBGV1pOQloKMgjBggESBDI4OTcYo7EBIPJcKNjXhwMww9iHAzhCQAFYAWoFQkFTSUNyCFMwRldaTkJaEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwCw&medianPrice=763.00&displayPrice=424.60&src=dflp) - St. Louis (STL)Atlanta (ATL) Sat, Mar 21 Sat, Mar 28 ![Southwest Airlines](https://a.travel-assets.com/air/airlines/wn_sq.svg)Southwest Airlines • Nonstop --- 6-day trip found 9 hours ago 40% less than typical $201 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:ATL,departure:3/21/2026TANYT&leg2=from:ATL,to:STL,departure:3/28/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-2963a4497385495b8a490ec2c0ba173e-227-1~8.S.1~AQoCCAESBwjUBBABGAEoAlgCcAB6A2Jmc4gBiYLdXKoBBwoDU1RMEACyAQcKA0FUTBAC~AQowCi4I15wBEgQ0NTM1GPJcIOBcKLWhiAMwlKKIAzhBQABYAWoDV0dBcgdBWk5WTjJECjAKLgjXnAESBDEwNzAY4Fwg8lwou--IAzCp8IgDOEFAAFgBagNXR0FyB0FaTlZOMkQSCggBEAEYASoCV04YASIECAEQASgCKAMoBDAB&medianPrice=431.00&displayPrice=200.80&src=dflp) - St. Louis (STL)Atlanta (ATL) Fri, Mar 27 Mon, Mar 30 ![Delta](https://a.travel-assets.com/air/airlines/dl_sq.svg)Delta • Nonstop --- 3-day trip found 20 hours ago 30% less than typical $218 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:ATL,departure:3/27/2026TANYT&leg2=from:ATL,to:STL,departure:3/30/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-13ba9777c3024f408d47a00cd1a5ca61-300-1~8.S.1~AQoCCAESBwjUBBABGAEoAlgCcAB6A2Jmc4gBn77aXKoBBwoDU1RMEACyAQcKA0FUTBAA~AQo3CjUIxJgBEgQxNTI0GPJcIOBcKJTeiAMw-d6IAzhFQABYAWoJTUFJTkJBU0lDcghWQVZTQTZCQwo3CjUIxJgBEgQxNDAzGOBcIPJcKMOHiQMwqoiJAzhFQABYAWoJTUFJTkJBU0lDcghWQVZTQTVCQxIKCAEQARgBKgJETBgBIgQIARABKAIoAygEMAE&medianPrice=413.00&displayPrice=217.80&src=dflp) - St. Louis (STL)Atlanta (ATL) Fri, Mar 27 Mon, Mar 30 ![Delta](https://a.travel-assets.com/air/airlines/dl_sq.svg)Delta • Nonstop --- 3-day trip found 21 hours ago 30% less than typical $218 [](https://www.expedia.com/Flights-Search?leg1=from:STL,to:ATL,departure:3/27/2026TANYT&leg2=from:ATL,to:STL,departure:3/30/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&airOfferToken=v5-sos-93a50435503a4e33808242dc63066afc-220-1~8.S.1~AQoCCAESBwjUBBABGAEoAlgCcAB6A2Jmc4gBu7TaXJABDKoBBwoDU1RMEACyAQcKA0FUTBAA~AQo3CjUIxJgBEgQxNTI0GPJcIOBcKJTeiAMw-d6IAzhFQABYAWoJTUFJTkJBU0lDcghWQVZTQTZCQwo3CjUIxJgBEgQxMTAyGOBcIPJcKJuGiQMw_oaJAzhFQABYAWoJTUFJTkJBU0lDcghWQVZTQTVCQxIKCAEQARgBKgJETBgBIgQIARABKAIoAygEMAE&medianPrice=413.00&displayPrice=217.80&src=dflp) ## Cheapest flights from O'Fallon These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Frontier Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/F9.gif) Sat, May 2 - Sat, May 9 STL St. Louis DEN Denver $56 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:5/2/2026TANYT&leg2=from:DEN,to:STL,departure:5/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:55.96&airProductToken=AQowCi4IxnISBDQ1NjcY8lwgg2ko7fmLAzCG-4sDOEVAAFgBagRQQ18xcgdLMjFTWFMyCjAKLgjGchIEMzMwMhiDaSDyXCiIx4wDMIzIjAM4RUAAWAFqBFBDXzFyB0syMVNYUzISCggBEAEYASoCRjkYASIECAEQASgCKAMwDQ) ![Frontier Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/F9.gif) Thu, May 7 - Sat, May 16 STL St. Louis DEN Denver $72 Roundtrip just found [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:5/7/2026TANYT&leg2=from:DEN,to:STL,departure:5/16/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:71.96&airProductToken=AQowCi4IxnISBDQ1NjcY8lwgg2koiLKMAzChs4wDOEVAAFgBagRQQ18xcgdaMjFSWFMyCjAKLgjGchIEMzMwMhiDaSDyXCjolY0DMOyWjQM4RUAAWAFqBFBDXzFyB0syMVNYUzISCggBEAEYASoCRjkYASIECAEQASgCKAMwDQ) ![Frontier Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/F9.gif) Sat, May 9 - Mon, May 18 STL St. Louis DEN Denver $82 Roundtrip just found [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:5/9/2026TANYT&leg2=from:DEN,to:STL,departure:5/18/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:81.97&airProductToken=AQovCi0IxnISBDQ1NjcY8lwgg2koyMiMAzDhyYwDOEtAAFgBagNFQ09yB0syMVNYUzIKLwotCMZyEgQzMzAyGINpIPJcKKisjQMwrK2NAzhaQABYAWoDRUNPcgdaMjFOWFMyEgoIARABGAEqAkY5GAEiBAgBEAEoAigDKAQwAQ) ![Frontier Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/F9.gif) Thu, May 7 - Mon, May 11 STL St. Louis DEN Denver $88 Roundtrip just found [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:5/7/2026TANYT&leg2=from:DEN,to:STL,departure:5/11/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:87.96&airProductToken=AQowCi4IxnISBDQ1NjcY8lwgg2koiLKMAzChs4wDOEVAAFgBagRQQ18xcgdaMjFSWFMyCjAKLgjGchIEMzMwMhiDaSDyXCjI3YwDMMzejAM4RUAAWAFqBFBDXzFyB1oyMU5YUzISDAgBEAEYASoCRjkyABgBIgQIARABKAIoAzAN) ![Frontier Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/F9.gif) Mon, Apr 13 - Sat, Apr 18 STL St. Louis DEN Denver $92 Roundtrip found 9 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:4/13/2026TANYT&leg2=from:DEN,to:STL,departure:4/18/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:91.96&airProductToken=AQowCi4IxnISBDQ1NjcY8lwgg2koj6SKAzCopYoDOEVAAFgBagRQQ18xcgdaMjFOWFMyCjAKLgjGchIEMzMwMhiDaSDyXCj82ooDMIDcigM4RUAAWAFqBFBDXzFyB0syMVNYUzISCggBEAEYASoCRjkYASIECAEQASgCKAMwDQ) ![Frontier Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/F9.gif) Sat, Apr 11 - Mon, Apr 20 STL St. Louis DEN Denver $98 Roundtrip just found [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:4/11/2026TANYT&leg2=from:DEN,to:STL,departure:4/20/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:97.97&airProductToken=AQovCi0IxnISBDQ1NjcY8lwgg2kozI2KAzDljooDOFpAAFgBagNFQ09yB1oyMVNYUzIKLwotCMZyEgQzMzAyGINpIPJcKLzxigMwwPKKAzhaQABYAWoDRUNPcgdaMjFOWFMyEgoIARABGAEqAkY5GAEiBAgBEAEoAigDKAQwAQ) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Sat, May 2 - Sat, May 9 STL St. Louis DEN Denver $157 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:5/2/2026TANYT&leg2=from:DEN,to:STL,departure:5/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:156.79&airProductToken=AQo4CjYI1YIBEgQxNzI5GPJcIINpKPv3iwMwlfmLAzhOQABYAWoKMV9iYXNpY2Vjb3IIS0FGNUFXQk4KOAo2CNWCARIEMTI5MxiDaSDyXCjmx4wDMOfIjAM4TkAAWAFqCjFfYmFzaWNlY29yCEtBRjVBV0JOEgoIARABGAEqAlVBGAEiBAgBEAEoAigDKAQwCw) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Sat, May 2 - Sat, May 9 STL St. Louis DEN Denver $177 Roundtrip found 1 hour ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:5/2/2026TANYT&leg2=from:DEN,to:STL,departure:5/9/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:176.39&airProductToken=AQpuCjUIxJgBEgQxNTM2GPJcIOBcKOnziwMwzPSLAzhFQABYAWoJTUFJTkJBU0lDcghWQVdOSDFCRwo1CMSYARIEMTY3NRjgXCCDaSi49osDMP33iwM4RUABWAFqCU1BSU5CQVNJQ3IIVkFXTkgxQkcKbQo0CMSYARIDMzAyGINpIOBcKP-_jAMwtcGMAzhFQABYAWoJTUFJTkJBU0lDcghWQVdOSDFCRwo1CMSYARIEMTU3MRjgXCDyXCiYwowDMP_CjAM4RUABWAFqCU1BSU5CQVNJQ3IIVkFXTkgxQkcSCggBEAEYASoCREwYASIECAEQASgCKAMoBDAB) ![Southwest Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/wn.gif) Sat, May 2 - Mon, May 4 STL St. Louis DEN Denver $177 Roundtrip found 15 hours ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DEN,departure:5/2/2026TANYT&leg2=from:DEN,to:STL,departure:5/4/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:176.80&airProductToken=AQowCi4I15wBEgQxNjg4GPJcIINpKNr4iwMw5vmLAzhEQABYAWoDV0dBcgdESk5XVDJFCjAKLgjXnAESBDIxMDIYg2kg8lwonJCMAzCZkYwDOEFAAFgBagNXR0FyB0FOTldUMkUSCggBEAEYASoCV04YASIECAEQASgCKAMoBDAB) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Tue, Apr 7 - Wed, Apr 8 STL St. Louis DFW Dallas $179 Roundtrip found 2 days ago [](https://expedia.com/Flights-Search?trip=roundtrip&leg1=from:STL,to:DFW,departure:4/7/2026TANYT&leg2=from:DFW,to:STL,departure:4/8/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:178.80&airProductToken=AQo0CjIIwYIBEgQyOTQ1GPJcIKOxASjP34kDMMngiQM4QkAAWAFqBUJBU0lDcghPVkFJS1NCWBIKCAEQARgBKgJBQRgBIgQIARABKAIoAygEMAs) ![](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_) ## How to Find Cheap Flights from O'Fallon, MO #### How much is a flight from O'Fallon? This week, flights from O'Fallon are available between $56 – $179\. #### How to find cheap flights from O'Fallon? Expedia makes it easy to compare cheap flights from O'Fallon to many destinations. Check out excellent deals on domestic and international flights from O'Fallon. Once you select an offer, use our filters and sort by “Price (Lowest)” to see some of the cheapest and suitable options. #### How can I get the best deal on flights from O'Fallon? On Expedia, you have some of best airline ticket deals at your fingertips. Whether it’s a beach escape with your partner, a family vacation with your kids, or business trip with colleagues, these low airline ticket prices mean more savings for you. An excellent strategy for finding some of the best deals on flights from O'Fallon is to be flexible with your dates. Within each offer, you can compare prices for similar timeframes using our “Show flexible dates” feature. Depending on your destination, direct flights from O'Fallon may be more expensive. Airlines with strict bag policies or fees can also impact your costs. #### What is the best airline to fly from O'Fallon? At Expedia, we give you all the available options from our reputable partners. Select the airline that best suits your preferences and membership loyalties. You can fly from O'Fallon with: Frontier Airlines, United, Delta, American Airlines, Southwest Airlines. #### What is the best month to fly from O'Fallon? One of the cheapest times to fly from O'Fallon airport(s) is May, based on the current list of flights available now. Prices on plane tickets vary considerably throughout the year due to availability and seasonal demand. #### Are there any last-minute flights from O'Fallon? Expedia is the place to find last-minute flights from O'Fallon, making it easy for you to compare prices on flights in the near future for different combinations of travel dates and from multiple airlines. We source some of the best deals for you and display some of the best offers available over the next 2 weeks. #### Why book your ticket with Expedia? Booking flights from O'Fallon with Expedia is the obvious choice to get low prices, save money, and see more value from every dollar spent. We show you some of the best deals happening right now and provide a vast inventory of airlines and flight routes to choose from, so you can find some of the cheapest flights from O'Fallon. You can customize your journey to your timeline, route preferences, budget, rewards programs, and more. #### Can I change/cancel my flight? Some flights can be changed or canceled, but fees and refunds will depend on the unique terms of your flight agreement. Airlines have different rules and restrictions for exchanging or refunding flights. For more information, go to your itinerary or visit our [customer service portal](https://www.expedia.com/service/). We recommend choosing flights with no change fees for the most flexibility. Filter by “Flexible change policies” to see flights with no change fees. \*Data specialists from both ARC and Expedia Group analysed ARC's global flight data to distil actionable information to help people save money on travel. While it's impossible to guarantee when to find the lowest prices, after examining the variables, we were able to observe trends. Analysis based on ARC, round-trip flight data between 1 October 2017 - 30 September 2018 for Economy and Premium cabin ATPs on a global basis. ## Travel information ## Flights from O'Fallon: Essential Travel Information | Cheapest flight from O'Fallon | $56 (roundtrip) | | ----------------------------------- | ----------------------------------------------------------------------- | | Best airlines to fly from O'Fallon | Frontier Airlines, United, Delta, American Airlines, Southwest Airlines | | Cheapest month to fly from O'Fallon | May | | O'Fallon IATA code | STL | | O'Fallon Country/State | St. Louis | | Airline ticket deals from O'Fallon | $56 - $179 | \*Flight schedules are subject to change. ## Explore a world of travel with Expedia - Lodging - Flights - Packages - Cars - Vacation Rentals - [Hotels near CarShield Field ](https://www.expedia.com/CarShield-Field-Hotels.0-l681801061030821888-0.Travel-Guide-Filter-Hotels) - [Dardenne Prairie Hotels ](https://www.expedia.com/Dardenne-Prairie-Hotels.d553248634983507896.Travel-Guide-Hotels) - 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