--- title: "$49 Cheap Flights to Southwest Illinois, IL - Expedia" description: "Looking for cheap flights to Southwest Illinois? Many airlines offer no change fee on selected flights and book now to earn your airline miles on top of our rewards! Find great 2026 Southwest Illinois flight deals now!" canonical: "https://www.expedia.com/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights" language: en-US market: US currency: USD prices_as_of: 2026-11-13T09:58:10Z --- # $49 Cheap Flights to Southwest Illinois, IL ![A calm lake surrounded by trees and vegetation.](https://images.trvl-media.com/place/6058943/ba13542c-304d-47c2-bad4-d7c83a7389e4.jpg?impolicy=fcrop&w=1200&h=500&q=medium) [View $49 flight on Fri, Feb 19, 2027](https://www.expedia.com/Flights-Search?leg1=from:FLL,to:BLV,departure:2/19/2027TANYT&trip=oneway&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:49.00&airProductToken=AQorCikIx2gSAzQ4NxjlWiDhqgEorNSlAzDc1aUDOEpAAFgBagJERnIESk5FVxIKCAEQARgBKgJHNBgBIgQIARABKAIoAygEMA0) Photo by Southernmost Illinois Tourism Bureau ## Popular airlines Allegiant Air American Airlines ### Be in the know Get alerts if flight prices drop or rise\* ### Book smarter Save up to 30% on select hotels after you book a flight\* ### Earn twice Earn your airline miles on top of our OneKeyCash [Learn about One Key](https://www.expedia.com/welcome-one-key) ## How much is the cheapest flight to Southwest Illinois? Prices were available within the past 7 days and start at $49 for one-way flights and $81 for roundtrip, for the period specified. Prices and availability are subject to change. All deals One way Roundtrip [Select Frontier Airlines flight, departing Mon, Jan 4 from Columbus to St. Louis, returning Fri, Jan 8, priced at $290 Found 8 hours ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:1/4/2027TANYT&leg2=from:STL,to:CMH,departure:1/8/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:289.96&airProductToken=AQpgCi4IxnISBDE2MTIYgjsgzHAostShAzDG1aEDOEVAAFgBagRQQ18xcgdHMjFWWFAyCi4IxnISBDI2MzUYzHAg8lwo79WhAzCR16EDOEVAAVgBagRQQ18xcgdHMjFWWFAyCmAKLgjGchIEMTYzMhjyXCDMcCji%5FaEDMPj-oQM4RUAAWAFqBFBDXzFyB0MyMVBYUDQKLgjGchIEMjc1NxjMcCCCOyi%5F%5F6EDMNKAogM4RUABWAFqBFBDXzFyB0MyMVBYUDQSCggBEAEYASoCRjkYASIECAEQASgCKAMoBDAN) Mon, J · an 4 - Fri, Jan 8 · CMH · STL · Roundtrip [Select Frontier Airlines flight, departing Tue, Dec 1 from Columbus to St. Louis, returning Sat, Dec 5, priced at $310 Found 8 hours ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:12/1/2026TANYT&leg2=from:STL,to:CMH,departure:12/5/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:309.99&airProductToken=AQpeCi0IxnISBDQxOTAYgjsgzHAowNGeAzDN0p4DOEdAAFgBagNFQ09yB0cxNE9YUDQKLQjGchIEMjYzNRjMcCDyXCiZ1Z4DML%5FWngM4R0ABWAFqA0VDT3IHRzE0T1hQNBIKCAEQARgBKgJGORgBIgQIARABKAIoAygEMAE) Tue, Dec 1 - Sat, Dec 5 · CMH · STL · Roundtrip [Select Frontier Airlines flight, departing Wed, Dec 2 from Columbus to St. Louis, returning Sun, Dec 6, priced at $318 Found 3 days ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:12/2/2026TANYT&leg2=from:STL,to:CMH,departure:12/6/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:317.79&airProductToken=AQpeCi0IxnISBDQxOTAYgjsgzHAo4NyeAzDt3Z4DOFJAAFgBagNFQ09yB1IyMU9YUDQKLQjGchIEMjYyORjMcCDyXCi94J4DMOPhngM4UkABWAFqA0VDT3IHUjIxT1hQNBIKCAEQARgBKgJGORgBIgQIARABKAIoAygEMAE) Wed, Dec 2 - Sun, Dec 6 · CMH · STL · Roundtrip [Select Frontier Airlines flight, departing Mon, Dec 28 from Columbus to St. Louis, returning Wed, Dec 30, priced at $320 Found 14 hours ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:12/28/2026TANYT&leg2=from:STL,to:CMH,departure:12/30/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:319.38&airProductToken=AQpgCi4IxnISBDE2MTIYgjsgzHAo0oWhAzDmhqEDOEVAAFgBagRQQ18xcgdDMjFQWFA0Ci4IxnISBDI2MzUYzHAg8lwoj4ehAzCxiKEDOEVAAVgBagRQQ18xcgdDMjFQWFA0EgoIARABGAEqAkY5GAEiBAgBEAEoAigDKAQwDQ) Mon, Dec 28 - Wed, Dec 30 · CMH · STL · Roundtrip [Select Frontier Airlines flight, departing Sat, Jan 23 from Columbus to St. Louis, returning Tue, Jan 26, priced at $325 Found 1 day ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:1/23/2027TANYT&leg2=from:STL,to:CMH,departure:1/26/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:324.98&airProductToken=AQpgCi4IxnISBDQxOTAYgjsgzHAo36mjAzD0qqMDOEVAAFgBagRQQ18xcgdDMDdPWFA0Ci4IxnISBDE2MzEYzHAg8lwozbCjAzD8saMDOEVAAVgBagRQQ18xcgdDMDdPWFA0EgoIARABGAEqAkY5GAEiBAgBEAEoAigDKAQwDQ) Sat, Jan 23 - Tue, Jan 26 · CMH · STL · Roundtrip [Select Frontier Airlines flight, departing Tue, Nov 24 from Columbus to St. Louis, returning Fri, Nov 27, priced at $328 Found 3 days ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:11/24/2026TANYT&leg2=from:STL,to:CMH,departure:11/27/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:327.18&airProductToken=AQpgCi4IxnISBDQxOTAYgjsgzHAoi4aeAzCZh54DOEVAAFgBagRQQ18xcgdHMTRPWFA0Ci4IxnISBDE2MzEYzHAg8lwopYieAzDHiZ4DOEVAAVgBagRQQ18xcgdHMTRPWFA0EgoIARABGAEqAkY5GAEiBAgBEAEoAigDKAQwDQ) Tue, Nov 24 - Fri, Nov 27 · CMH · STL · Roundtrip [Select Southwest Airlines flight, departing Mon, Jan 4 from Columbus to St. Louis, returning Fri, Jan 8, priced at $340 Found 8 hours ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:1/4/2027TANYT&leg2=from:STL,to:CMH,departure:1/8/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:339.38&airProductToken=AQowCi4I15wBEgQxMjgxGII7IPJcKKvOoQMwis-hAzhFQABYAWoDV0dBcgdFWk5WUzJFEgoIARABGAEqAldOGAEiBAgBEAEoAigDKAQwAQ) Mon, Jan 4 - Fri, Jan 8 · CMH · STL · Roundtrip [Select Delta flight, departing Mon, Jan 4 from Columbus to St. Louis, returning Fri, Jan 8, priced at $353 Found 8 hours ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:1/4/2027TANYT&leg2=from:STL,to:CMH,departure:1/8/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:352.18&airProductToken=AQpuCjUIxJgBEgQyNDY5GII7IOBcKPTNoQMw3M6hAzhFQABYAWoJTUFJTkJBU0lDcghWQVVOQTBCQwo1CMSYARIEMTQwMBjgXCDyXCjuz6EDMODQoQM4RUABWAFqCU1BSU5CQVNJQ3IIVkFVTkEwQkMSCggBEAEYASoCREwYASIECAEQASgCKAMoBDAB) Mon, Jan 4 - Fri, Jan 8 · CMH · STL · Roundtrip [Select United flight, departing Wed, Jan 6 from Columbus to St. Louis, returning Wed, Feb 3, priced at $369 Found 8 hours ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:1/6/2027TANYT&leg2=from:STL,to:CMH,departure:2/3/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:368.40&airProductToken=AQpwCjYI1YIBEgQ0NjU1GII7IK4cKLDnoQMwmuihAzhOQABYAWoKMV9iYXNpY2Vjb3IIU0FLMkFLQlMKNgjVggESBDQ0NzQYrhwg8lwor-mhAzCR6qEDOE5AAFgBagoxX2Jhc2ljZWNvcghTQUsyQUtCUxIKCAEQARgBKgJVQRgBIgQIARABKAIoAygEMAs) Wed, Jan 6 - Wed, Feb 3 · CMH · STL · Roundtrip [Select American Airlines flight, departing Sat, Jan 23 from Columbus to St. Louis, returning Tue, Jan 26, priced at $369 Found 1 day ago](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:1/23/2027TANYT&leg2=from:STL,to:CMH,departure:1/26/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:368.40&airProductToken=AQpmCjEIwYIBEgQzNTcyGII7IK4cKN6kowMwxKWjAzhCQABYAWoFQkFTSUNyCE5WQUlVU0JYCjEIwYIBEgQ0MzM2GK4cIPJcKOKlowMwwaajAzhCQAFYAWoFQkFTSUNyCE5WQUlVU0JYEgoIARABGAEqAkFBGAEiBAgBEAEoAigDKAQwCw) Sat, Jan 23 - Tue, Jan 26 · CMH · STL · Roundtrip ## Alternative airports Prices were available within the past 7 days. Prices and availability are subject to change. [Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Flights from $346](https://www.expedia.com/Flights-Search?leg1=from:CMH,to:STL,departure:11/27/2026TANYT&leg2=from:STL,to:CMH,departure:11/30/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) ## Frequently Asked Questions ### What month is the cheapest to fly to Southwest Illinois? The cheapest month to fly to Southwest Illinois is January when there's less demand. Off-peak months are often when you'll find cheap fares. To save money, steer clear of flying during school breaks and public holidays. ### Which US cities have the cheapest flights to Southwest Illinois? Generally, New York, Washington and Dallas offer cheap flights to Southwest Illinois. However, flexibility is the secret to getting the best prices. Book midweek or during the off-peak season to keep costs to a minimum. ### Which US cities fly direct to Southwest Illinois? You can fly to Southwest Illinois without any stops from 150 US destinations. To find a nonstop route, use the "Direct flights only" filter when organizing your flights to Southwest Illinois on Expedia. Then, explore the options and pick the best departure out of any of these cities: - New York - Washington - Dallas - Boston - Phoenix ### How to find a cheap flight to Southwest Illinois? Book your trip early to increase your chances of finding cheap flights to Southwest Illinois. Also, consider visiting during off-peak months like December and January. If you fly on a Thursday, you can save 16% on average compared to those departing on a Sunday.\* Save time searching every day and track your flight prices using the [Expedia app](https://www.expedia.com/app). We'll update you when fares change. *\*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.* ### How to get a cheap last-minute flight to Southwest Illinois? Being flexible with your travel plans can help you find last-minute deals on cheap flights to Southwest Illinois. To view all the available options, try exploring different ticket types, tweaking your Southwest Illinois trip dates, jetting out of an alternative airport or using another airline. ### How far in advance should I book a flight to Southwest Illinois? To pick up the best deals on domestic journeys, book your flight to Southwest Illinois 28 days ahead of your travel dates. For international flights, it's between two and four months in advance. This improves your chances of locking in the departure dates and seats you want.\* *\*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.* ### Which day of the week is the cheapest day to buy a plane ticket to Southwest Illinois? Sundays are usually the best day to book a cheap flight to Southwest Illinois, where you can save 8% on average compared to a Friday. If you decide to buy tickets on a Friday, expect to spend more as this is often the most expensive day.\* *\*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.* ### Which airlines fly to Southwest Illinois? Choose the window or aisle seat and head to Southwest Illinois with one of these reputable airlines: - American Airlines - 1,079 flights to Southwest Illinois each month, including 927 flights to Lambert-St. Louis Intl. Airport (STL) per month. - Delta Air Lines - 723 flights to Southwest Illinois each month, including 637 flights to Lambert-St. Louis Intl. Airport (STL) per month. ### Where do you fly into Southwest Illinois? When flying to Southwest Illinois, the main airport to arrive at is Williamson County Regional Airport (MWA). You can also jet into nearby hubs like Lambert-St. Louis Intl. Airport (STL), MidAmerica-St. Louis Airport (BLV) or Mount Vernon, IL (MVN-Mount Vernon Outland). Another possibility to think about when you fly to Southwest Illinois is St. Louis Downtown Airport (CPS). ### Can I save money by booking a Southwest Illinois trip package? It's possible to save hundreds of dollars if you choose a [Southwest Illinois flight and hotel package deal](https://www.expedia.com/Southwest-Illinois.d6058943.Destination-Travel-Guides) on Expedia. And you'll save time and hassle by having all your travel arrangements in one place. Try bundling your flight and hotel with add-ons like tours and activities for your own personalized Southwest Illinois vacation. ### Can I change or cancel my flight to Southwest Illinois? If you reserved your flight to Southwest Illinois within the last 24 hours, you can usually change or cancel it for free. After that, extra charges may apply depending on the airline's rules and restrictions. For more information, check out our [Customer Service Portal](https://www.expedia.com/service/?langid=1033). Remember that some flights are non-refundable, so you may receive a credit for a future trip rather than a direct refund. When browsing Expedia, select the "No cancel fee" or "Changes included" filters to find tickets with flexible change policies. ## Travel information | Airlines serving | Allegiant Air | | ---------------- | ------------- | | Popular airline | Allegiant Air | | Roundtrip price | $290 | ## Explore a world of travel with Expedia - [Lodging](?equalTargetTab=tab-0) - [Flights](?equalTargetTab=tab-1) - [Packages](?equalTargetTab=tab-2) - [Cars](?equalTargetTab=tab-3) - [Vacation Rentals](?equalTargetTab=tab-4) - [Family Hotels in Southwest Illinois](https://www.expedia.com/Southwest-Illinois-Hotels-Family-Hotel.0-0-d6058943-tFamilyHotel.Travel-Guide-Filter-Hotels) - [Cabin Rentals in Carlyle](https://www.expedia.com/Carlyle-Cabins.d6058956-aaCabins.Travel-Guide-Accommodation) - [Rv Parks in Southwest Illinois](https://www.expedia.com/Southwest-Illinois-RV-Parks.d6058943-aaRVParks.Travel-Guide-Accommodation) - [4 Star Hotels in Nashville](https://www.expedia.com/4Star-Nashville-Hotels.s40-0-d180762.Travel-Guide-Filter-Hotels) - 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Prices and availability are subject to change. All deals One way Roundtrip [Select Allegiant Air flight, departing Thu, Jan 14 from Fort Lauderdale to Belleville, returning Sun, Jan 17, priced at $81 Found 6 hours ago](https://www.expedia.com/Flights-Search?leg1=from:FLL,to:BLV,departure:1/14/2027TANYT&leg2=from:BLV,to:FLL,departure:1/17/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:81.00&airProductToken=AQorCikIx2gSAzQ5NBjlWiDhqgEojr-iAzC4wKIDOEtAAFgBagJERnIES05FVworCikIx2gSAzQ5NxjhqgEg5VooyuKiAzDp46IDOEpAAFgBagJERnIESk5FVxIKCAEQARgBKgJHNBgBIgQIARABKAIoAygEMA0) Thu, Jan 14 - Sun, Jan 17 · FLL · BLV · Roundtrip \*Available to One Key members. ## Other language versions ```yaml hreflang: x-default: https://www.expedia.com/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights nl-NL: https://www.expedia.nl/Goedkope-Vliegtickets-Southwest-Illinois.d6058943.Reisgids-Vliegtickets es-MX: https://www.expedia.mx/Vuelos-Baratos-Suroeste-De-Illinois.d6058943.Guia-de-vuelos en-US: https://www.expedia.com/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights pt-BR: https://www.expedia.com.br/Voos-Para-Sudoeste-De-Illinois.d6058943.guia-de-voos en-TW: https://www.expedia.com.tw/en/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights en-GB: https://www.expedia.co.uk/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights fr-BE: https://www.expedia.be/fr/Vols-Sud-Ouest-De-LIllinois.d6058943.Guide-De-Vol en-SG: https://www.expedia.com.sg/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights ko-KR: https://www.expedia.co.kr/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights en-JP: https://www.expedia.co.jp/en/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights en-KR: https://www.expedia.co.kr/en/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights de-DE: https://www.expedia.de/Billigflug-Southwest-Illinois.d6058943.Reise-Angebote-Flug de-CH: https://www.expedia.ch/Billigflug-Southwest-Illinois.d6058943.Reise-Angebote-Flug zh-TW: https://www.expedia.com.tw/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights nb-NO: https://www.expedia.no/Fly-Til-Srvest-Illinois.d6058943.Reise-Guide-Fly it-IT: https://www.expedia.it/Voli-Per-Illinois-Sud-Occidentale.d6058943.Guida-Voli-aerei es: https://www.expedia.com/es/Vuelos-Baratos-Suroeste-De-Illinois.d6058943.Guia-de-vuelos zh-hans-HK: https://www.expedia.com.hk/cn/Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights en-AU: https://www.expedia.com.au/Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights da-DK: https://www.expedia.dk/Fly-Til-Sydvest-Illinois.d6058943.Rejse-Guide-Fly de-AT: https://www.expedia.at/Billigflug-Southwest-Illinois.d6058943.Reise-Angebote-Flug en-NZ: https://www.expedia.co.nz/Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights en-CA: https://www.expedia.ca/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights ja-JP: https://www.expedia.co.jp/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights sv-SE: https://www.expedia.se/Flyg-Till-Sydvastra-Illinois.d6058943.Reseguide-Flyg fr-CH: https://www.expedia.ch/fr/Vols-Pas-Cher-Sud-Ouest-De-LIllinois.d6058943.Voyage-Guide-Vols en-IE: https://www.expedia.ie/Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights fr-CA: https://www.expedia.ca/fr/Cheap-Flights-To-Sud-Ouest-De-LIllinois.d6058943.Travel-Guide-Flights nl-BE: https://www.expedia.be/Destinations-In-Southwest-Illinois.d6058943.Vliegtickets en-MY: https://www.expedia.com.my/Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights en-HK: https://www.expedia.com.hk/en/Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights fi-FI: https://www.expedia.fi/Halvat-Lennot-Lounais-Illinois.d6058943.Matkaopas-Lennot zh-hant-HK: https://www.expedia.com.hk/Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights en-IN: https://www.expedia.co.in/Cheap-Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights zh-CN: https://www.expedia.com/cn/Flights-To-Southwest-Illinois.d6058943.Travel-Guide-Flights ```