Title: Cheap Flights to O'Fallon , IL from CA $129 - Expedia.ca ![Lodging Image](https://a.travel-assets.com/travel-assets-manager/bex-affinities/lodging.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://a.travel-assets.com/travel-assets-manager/bex-affinities/lodging.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights to O'Fallon , IL from CA $129 [View CA $129 flight on Fri, Apr 24, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:SEA,to:STL,departure:24/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:128.20&airProductToken=AQpvCjUIxJgBEgM4MTAYkgEg47QBKJaiiwMwlqSLAzhFQABYAWoJTUFJTkJBU0lDcghWQVZTQTBCQwo2CMSYARIEMzU2OBjjtAEg8lwoq6WLAzCYposDOEVAAVgBaglNQUlOQkFTSUNyCFZBVlNBMEJDEgoIARABGAEqAkRMGAEiBAgBEAEoAigDKAQwAQ) - [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 [Hotels in O'Fallon](https://expedia.ca/OFallon-Hotels.d7403.Travel-Guide-Hotels)[O'Fallon Car Rentals](https://expedia.ca/Car-Rentals-In-OFallon.d7403.Car-Rental-Guide)[O'Fallon Vacation Packages](https://expedia.ca/OFallon.d7403.Destination-Travel-Guides) ## Popular airlines to O'Fallon - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:CMH,to:O'Fallon, Illinois, United States of America,departure:01/03/2026TANYT&leg2=from:O'Fallon, Illinois, United States of America,to:CMH,departure:08/03/2026TANYT&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_DL.svg) Delta [](https://www.expedia.ca/Flights-Search?leg1=from:CMH,to:O'Fallon, Illinois, United States of America,departure:01/03/2026TANYT&leg2=from:O'Fallon, Illinois, United States of America,to:CMH,departure:08/03/2026TANYT&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_UA.svg) United [](https://www.expedia.ca/Flights-Search?leg1=from:CMH,to:O'Fallon, Illinois, United States of America,departure:01/03/2026TANYT&leg2=from:O'Fallon, Illinois, United States of America,to:CMH,departure:08/03/2026TANYT&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.ca/Flights-Search?leg1=from:CMH,to:O'Fallon, Illinois, United States of America,departure:01/03/2026TANYT&leg2=from:O'Fallon, Illinois, United States of America,to:CMH,departure:08/03/2026TANYT&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_F9.svg) Frontier Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:CMH,to:O'Fallon, Illinois, United States of America,departure:01/03/2026TANYT&leg2=from:O'Fallon, Illinois, United States of America,to:CMH,departure:08/03/2026TANYT&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_AS.svg) Alaska Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:CMH,to:O'Fallon, Illinois, United States of America,departure:01/03/2026TANYT&leg2=from:O'Fallon, Illinois, United States of America,to:CMH,departure:08/03/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) - ![](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada [](https://www.expedia.ca/Flights-Search?leg1=from:CMH,to:O'Fallon, Illinois, United States of America,departure:01/03/2026TANYT&leg2=from:O'Fallon, Illinois, United States of America,to:CMH,departure:08/03/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![](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 rewards [Sign in](https://www.expedia.ca/login) ## How much is the cheapest flight to O'Fallon? Prices were available within the past 7 days and start at CA $129 for one-way flights and CA $239 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Fri, Apr 24 - Tue, Apr 28 SEA Seattle STL St. Louis CA $239 Roundtrip found 4 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:STL,departure:24/04/2026TANYT&leg2=from:STL,to:SEA,departure:28/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:238.66&airProductToken=AQpvCjUIxJgBEgM4MTAYkgEg47QBKJaiiwMwlqSLAzhFQABYAWoJTUFJTkJBU0lDcghWQVZTQTBCQwo2CMSYARIEMzU2OBjjtAEg8lwoq6WLAzCYposDOEVAAVgBaglNQUlOQkFTSUNyCFZBVlNBMEJDEgoIARABGAEqAkRMGAEiBAgBEAEoAigDKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Fri, Apr 24 - Tue, Apr 28 SEA Seattle STL St. Louis CA $252 Roundtrip found 4 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:STL,departure:24/04/2026TANYT&leg2=from:STL,to:SEA,departure:28/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:251.10&airProductToken=AQpmCjEIwYIBEgQyNzQxGJIBIK4cKMOdiwMw0Z-LAzhCQABYAWoFQkFTSUNyCFFWQVpaTkJWCjEIwYIBEgQyOTU2GK4cIPJcKPKgiwMwvqGLAzhCQAFYAWoFQkFTSUNyCFFWQVpaTkJWCmUKMAjBggESAzQxOBjyXCCuHCi9y4sDMJvMiwM4QkAAWAFqBUJBU0lDcghPVkFLVVNCVgoxCMGCARIEMTI4OBiuHCCSASjPzYsDMOLPiwM4QkABWAFqBUJBU0lDcghPVkFLVVNCVhIKCAEQARgBKgJBQRgBIgQIARABKAIoAygEMAs) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Fri, Apr 24 - Tue, Apr 28 SEA Seattle STL St. Louis CA $259 Roundtrip found 4 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:STL,departure:24/04/2026TANYT&leg2=from:STL,to:SEA,departure:28/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:258.87&airProductToken=AQovCi0IwaYBEgM0NzIYkgEg8lwo2Z-LAzDLoYsDOFhAAFgBagJTVnIIT0gyT0FVQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) ![Hawaiian Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/HA.gif) Tue, Apr 7 - Tue, Apr 21 SEA Seattle STL St. Louis CA $295 Roundtrip found 2 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:STL,departure:07/04/2026TANYT&leg2=from:STL,to:SEA,departure:21/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:294.40&airProductToken=AQoiCiAIyIIBEgQ2OTM5GJIBIPJcKL7giQMwq-KJAzhVQABYAQoiCiAIyIIBEgQ3MTI2GPJcIJIBKIL8igMwk_6KAzhVQABYARIKCAEQARgBKgJIQRgBIgQIARABKAQwAQ) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Mon, Apr 27 - Tue, Apr 28 YVR Vancouver STL St. Louis CA $343 Roundtrip found 21 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:YVR,to:STL,departure:27/04/2026TANYT&leg2=from:STL,to:YVR,departure:28/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:342.32&airProductToken=AQpFCiEI1YIBEgQxMDgzGLiNASCycSiMwosDMJ7DiwM4TkAAWAEKIAjVggESBDU3MzkYsnEg8lwo_MOLAzCKxosDOE5AAVgBCkUKIAjVggESBDU3MjgY8lwgsnEoqseLAzDFyYsDOE5AAFgBCiEI1YIBEgQyNDI5GLJxILiNASj1zIsDMI_OiwM4TkABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) ## Find the cheapest month to fly from Columbus (CMH) to St. Louis (STL) ### October is typically the cheapest month to fly From CA $193 - CA $632 per traveller. ![](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.ca/deals?rfrr=FTG_SPRING_PROMO_) Expedia.ca gives you the best tools to secure great deals on flights to O'Fallon. Use our easy and convenient booking engine to browse nonstop flights and convenient departure points every day of the year. Search airfares from the top airlines to book your perfect flight to O'Fallon. Whatever your travel needs, you can always rely on Expedia.ca to help you find cheap flights to O'Fallon. Using our booking engine is simple - just type in your points of travel and preferred dates and Expedia.ca does the rest! If your travel times are flexible, you can find even better bargains by adjusting your flight dates. Browse connecting flights to increase your chances of finding even lower fares. Thanks to Expedia's Best Price Guarantee, you can book your O'Fallon flights with full confidence knowing that you've found the best deal online. Expedia.ca makes the booking process easy and stress-free by offering support along the entire way. Our friendly staff is available 24 hours a day to provide assistance and help you book your ticket. Call us toll-free at 1-888-397-3342 to answer any questions that you may have about your trip to O'Fallon. Looking to save even more? Get additional savings by bundling your O'Fallon flight with a hotel and/or car rental to create a bargain travel package. Early birds can discover terrific savings by booking in advance while last minute travelers can enjoy great last minute deals. With Expedia.ca, there's no shortage of options to save even more on your O'Fallon trip! ## Frequently asked questions ### What is the name of O'Fallon's airport? ### How far is STL from central O'Fallon? ### What airport is best to fly into O'Fallon? ### How many airlines fly to O'Fallon? ### Which airlines fly to O'Fallon? ### How many nonstop flights are there to O'Fallon? ### Where are the most popular flights to O'Fallon departing from? ### How long is the flight to O'Fallon Airport? ### How to book the cheapest flight to O'Fallon? ### Do you have any tips for my flight to O'Fallon? > - It's simple — first, pack in your passport, travel documents, credit cards and vital medications. Next, you'll need some in-flight entertainment to while away the hours. A thrilling novel and a laptop crammed with your favourite shows are good options. If you plan to take a quick snooze, a comfy neck pillow and a pair of earplugs will also be useful. Finally, leave some space for a few toiletry items so you'll step off the plane looking and feeling fresh. > > > Do not pack the following items in your hand luggage: > > > - Check carefully that you don't have a sharp object hiding in the bottom of your hand luggage. Other banned items include flammable or explosive goods, such as aerosol cans and bleach, and liquids and gels in containers larger than 3.4 ounces (100 millilitres). > > > What to wear on a flight: > > > - Your main aim is to be as comfortable as possible. Choose slip-on footwear, dress in loose, breathable clothing and remember to take a sweater in case it gets cold in the cabin. > - The result of sustained periods of inactivity, deep vein thrombosis (DVT) is a blood clot condition that can affect passengers during long flights. Reduce the risks by staying hydrated, keeping your legs moving and wearing compression tights or socks. ### How to get through airport security fast when flying to O'Fallon? > - First things first. Your travel ID and boarding pass will need to be inspected by security personnel. Have them close by so you don't hold up the line. > - The X-ray machine is up next. Remove anything on you that is likely to beep. This includes things like headphones or earphones, as well as your coat or jacket. They'll need to be placed on the conveyor belt for screening. > - Electronic devices like phones and laptops will also need to go on a tray for inspection. No need to worry though, you'll be back online before you know it. > - Any gels or liquids, such as perfume or hairspray, that you want to bring on board must be no larger than 3.4 ounces (100 millilitres). Also, everything must fit inside a quart-size (one litre), clear zip-lock bag. > - It's also likely that you'll need to remove your shoes to be X-rayed, so wearing slip-on sneakers is always a good idea. > - Airlines will not allow any sharp items or pocket knives to come on board with you. If you need to bring these kinds of items, put them in your checked luggage. __Flights to O'Fallon information__ | Destination airport | Lambert-St. Louis Intl. | | ----------------------------- | ----------------------- | | Destination airport IATA code | STL | | Destination city name | St. Louis | | Roundtrip price | CA $234 | ## Trending flights to O'Fallon Prices were available within the past 7 days and start at CA $129 for one-way flights and CA $239 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) Mon, Apr 27 - Tue, Apr 28 YVR Vancouver STL St. Louis CA $343 Roundtrip found 21 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:YVR,to:STL,departure:27/04/2026TANYT&leg2=from:STL,to:YVR,departure:28/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:342.32&airProductToken=AQpFCiEI1YIBEgQxMDgzGLiNASCycSiMwosDMJ7DiwM4TkAAWAEKIAjVggESBDU3MzkYsnEg8lwo_MOLAzCKxosDOE5AAVgBCkUKIAjVggESBDU3MjgY8lwgsnEoqseLAzDFyYsDOE5AAFgBCiEI1YIBEgQyNDI5GLJxILiNASj1zIsDMI_OiwM4TkABWAESCggBEAEYASoCVUEYASIECAEQASgEMAE) \*Available to Expedia members.