Title: Cheap Flights to Southern Illinois , IL from CA $238 - Expedia.ca ![Southern Illinois featuring a sunset, forests and landscape views](https://images.trvl-media.com/place/553248635944113522/0e29d2f8-2d58-457a-908d-4b89b13776d9.jpg?impolicy=fcrop&w=1200&h=500&q=medium) Photo by Southernmost Illinois Tourism Bureau ![](https://images.trvl-media.com/place/553248635944113522/0e29d2f8-2d58-457a-908d-4b89b13776d9.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights to Southern Illinois , IL from CA $238 [View CA $238 flight on Sat, Feb 14, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:YVR,to:STL,departure:14/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:237.42&airProductToken=AQpECiEIwaYBEgQyMzA0GLiNASCSASiokoUDMOaShQM4WEAAWAEKHwjBpgESAzYxOBiSASDyXCibk4UDMIeVhQM4WEABWAESCggBEAEYASoCQVMYASIECAEQASgEMAE) - [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 [Southern Illinois Travel Guide](https://expedia.ca/Southern-Illinois.dx6233859)[Hotels in Southern Illinois](https://expedia.ca/Southern-Illinois-Hotels.d6233859.Travel-Guide-Hotels)[Southern Illinois Car Rentals](https://expedia.ca/Car-Rentals-In-Southern-Illinois.d6233859.Car-Rental-Guide)[Southern Illinois Vacation Packages](https://expedia.ca/Southern-Illinois.d6233859.Destination-Travel-Guides) ## Popular airlines - ![Contour Airlines](https://a.travel-assets.com/air/airlines/lf_sq.svg) Contour Airlines - ![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) ## How much is the cheapest flight to Southern Illinois? Prices were available within the past 7 days and start at CA $238 for one-way flights and CA $413 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) Tue, Feb 17 - Tue, Feb 24 YUL Montreal STL St. Louis CA $442 Roundtrip found 8 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:YUL,to:STL,departure:17/02/2026TANYT&leg2=from:STL,to:YUL,departure:24/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:441.29&airProductToken=AQqbAQoyCMGCARIENTY3ORiYXSDimgEonLOFAzDatIUDOEJAAFgBagVCQVNJQ3IIT1ZBQ1pTQlgKMgjBggESBDIyOTAY4poBIK4cKIm3hQMwj7iFAzhCQAFYAWoFQkFTSUNyCE9WQUNaU0JYCjEIwYIBEgQxOTI2GK4cIPJcKI-6hQMw2bqFAzhCQAFYAWoFQkFTSUNyCE9WQUlLU0JYCmUKMAjBggESAzgxMBjyXCCuHCjwgYYDMMaChgM4QkAAWAFqBUJBU0lDcghPVkFJS1NCWAoxCMGCARIEMzgzMxiuHCCYXSjPhIYDMNqFhgM4QkABWAFqBUJBU0lDcghPVkFDWlNCWBIKCAEQARgBKgJBQRgBIgQIARABKAIoAygEMAs) ![Air Canada](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AC.gif) Tue, Mar 31 - Wed, Apr 1 YYZ Toronto STL St. Louis CA $493 Roundtrip found 4 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:YYZ,to:STL,departure:31/03/2026TANYT&leg2=from:STL,to:YYZ,departure:01/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:492.16&airProductToken=AQo0CjIIwYYBEgQ4OTY5GJjOASDyXCjCjokDMMiPiQM4R0AAWAFqBUJBU0lDcghHTkE0QTJCQQo0CjIIwYYBEgQ4OTcwGPJcIJjOASiRm4kDMIaciQM4R0AAWAFqBUJBU0lDcghHTkE0QTJCQRIKCAEQARgBKgJBQxgBIgQIARABKAIoAygEMA0) ![United](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/UA.gif) Fri, Jan 9 - Sat, Jan 10 YYZ Toronto STL St. Louis CA $500 Roundtrip just found [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:YYZ,to:STL,departure:09/01/2026TANYT&leg2=from:STL,to:YYZ,departure:10/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:499.86&airProductToken=AQptCjUI1YIBEgQzNTE0GJjOASCuHCim_IEDMK39gQM4TkAAWAFqCEVDT0JBU0lDcghHTkE0QTJCTgo0CNWCARIENDYxMxiuHCDyXCj9_YEDMN7-gQM4TkABWAFqCEVDT0JBU0lDcghHTkE0QTJCTgptCjQI1YIBEgQ0NTA2GPJcIIgYKOaIggMw6ImCAzhOQABYAWoIRUNPQkFTSUNyCEdOQTRBMkJOCjUI1YIBEgQzNDkwGIgYIJjOASifioIDMIKLggM4TkABWAFqCEVDT0JBU0lDcghHTkE0QTJCThIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAE) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Fri, Jan 30 - Mon, Feb 2 YYZ Toronto STL St. Louis CA $526 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:YYZ,to:STL,departure:30/01/2026TANYT&leg2=from:STL,to:YYZ,departure:02/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:525.28&airProductToken=AQpvCjYIxJgBEgQ1MTgzGJjOASDLASia6IMDMIzpgwM4RUAAWAFqCU1BSU5CQVNJQ3IIVkFVU0EwQlEKNQjEmAESBDU4MjIYywEg8lwoouqDAzDZ64MDOEVAAVgBaglNQUlOQkFTSUNyCFZBVVNBMEJREgoIARABGAEqAkRMGAEiBAgBEAEoAigDKAQwAQ) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Tue, Jan 27 - Tue, Feb 3 YYZ Toronto STL St. Louis CA $538 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:YYZ,to:STL,departure:27/01/2026TANYT&leg2=from:STL,to:YYZ,departure:03/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:537.37&airProductToken=AQpDCiAIwaYBEgMzOTEYmM4BIJIBKLnLgwMwhc6DAzhYQABYAQofCMGmARIDNjE4GJIBIPJcKPvTgwMw6tWDAzhYQAFYAQpDCh8IwaYBEgM2MTgY8lwgkgEo4pmEAzD1m4QDOFhAAFgBCiAIwaYBEgMzODUYkgEgmM4BKNuihAMw86SEAzhYQAFYARIKCAEQARgBKgJBUxgBIgQIARABKAQwAQ) ## Frequently asked questions ### How do I find cheap flights to Southern Illinois that have flexible change policies? ### Which airlines fly to Southern Illinois? > - Southwest Airlines - 2,907 flights to or near Southern Illinois each month, including 2,907 flights to Lambert-St. Louis Intl. Airport (STL) per month. > - American Airlines - 1,023 flights to or near Southern Illinois each month, including 810 flights to Lambert-St. Louis Intl. Airport (STL) per month. > - Delta - 602 flights to or near Southern Illinois each month, including 516 flights to Lambert-St. Louis Intl. Airport (STL) per month. ### How can I find cheap tickets to Southern Illinois? ### How much is a flight to Southern Illinois? ### What are the most popular airports to fly into in Southern Illinois? > - Lambert-St. Louis Intl. Airport (STL) - 5,094 flights per month. > - Evansville Regional Airport (EVV) - 325 flights per month. > - Williamson County Regional Airport (MWA) - 52 flights per month. ### When is the cheapest time to fly to Southern Illinois? ### How much is a plane ticket to Southern Illinois? ### What are the best things to do in Southern Illinois? > - Get your vacation underway in the premier city of Alton and you'll have a seemingly endless list of attractions to enjoy. Argosy Casino is just the tip of the sightseeing iceberg. You'll want to soak up the buzzing nightlife, taste the local cuisine and shop up a storm while you're in town as well. > - If you're not sure what to pack beyond your credit card, passport and cellphone, check the local forecast. This will help you choose your travel wardrobe for the time of year you're staying in Alton, which has a humid subtropical climate. ### What is the best time to go to Southern Illinois? ### What months are the cheapest to book a flight to Southern Illinois? ## Book with confidence Expedia.ca gives you the best tools to secure great deals on flights to Southern Illinois. 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 Southern Illinois. Whatever your travel needs, you can always rely on Expedia.ca to help you find cheap flights to Southern Illinois. 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 Southern Illinois 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 Southern Illinois. Looking to save even more? Get additional savings by bundling your Southern Illinois 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 Southern Illinois trip! ## Travel information | Destination airport | Lambert-St. Louis Intl. | | ----------------------------- | ----------------------- | | Destination airport IATA code | STL | | Destination city name | St. Louis | | Roundtrip price | CA $413 | ## Trending flights to Southern Illinois Prices were available within the past 7 days and start at CA $238 for one-way flights and CA $413 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Tue, Feb 24 - Sat, Feb 28 YVR Vancouver STL St. Louis CA $413 Roundtrip found 8 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:YVR,to:STL,departure:24/02/2026TANYT&leg2=from:STL,to:YVR,departure:28/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:412.88&airProductToken=AQpECiEIwaYBEgQyMzA0GLiNASCSASjogoYDMKaDhgM4WEAAWAEKHwjBpgESAzYxOBiSASDyXCjbg4YDMMeFhgM4WEABWAEKRAofCMGmARIDMzE0GPJcIJIBKP-yhgMwlrWGAzhYQABYAQohCMGmARIEMjA0MRiSASC4jQEoq7aGAzDntoYDOFhAAVgBEgoIARABGAEqAkFTGAEiBAgBEAEoBDAB) ## Explore a world of travel with Expedia - Lodging - Flights - Packages - Cars - [Ashley Hotels ](https://www.expedia.ca/Ashley-Hotels.d553248634983445011.Travel-Guide-Hotels) - [Belle Prairie City Hotels ](https://www.expedia.ca/Belle-Prairie-City-Hotels.d553248634983187790.Travel-Guide-Hotels) - 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