$72+ Cheap flights from Illinois to St. Louis (STL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — STL
Nov 19 — Nov 261
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Illinois to St. LouisExplore the most affordable flight options available from Illinois to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2026.
Explore the most affordable flight options available from Illinois to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2026.
This Southwest deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/216:55 pm -
2 stops5h 00m
Sun 11/228:20 am -
1 stop5h 25m
Deal found 10/16![Southwest logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/177:35 pm -
1 stop22h 07m
Thu 11/197:24 pm -
1 stop4h 49m
Deal found 10/15![Frontier logo]()
$200
This Southwest deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1810:05 am -
1 stop3h 15m
Thu 11/194:40 pm -
Nonstop1h 10m
Deal found 10/16![Southwest logo]()
$201
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/149:59 am -
1 stop6h 42m
Sat 11/2110:20 am -
1 stop3h 39m
Deal found 10/16![Delta logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/68:15 am -
1 stop27h 02m
Mon 12/1412:02 pm -
1 stop26h 28m
Deal found 10/15![Frontier logo]()
$205
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:05 am -
1 stop5h 15m
Tue 11/178:30 am -
1 stop3h 45m
Deal found 10/15![Southwest logo]()
$211
This Delta deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:20 am -
1 stop4h 34m
Sat 11/144:39 pm -
1 stop3h 38m
Deal found 10/15![Delta logo]()
$211
This Frontier deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:30 am -
1 stop12h 44m
Fri 11/206:05 pm -
1 stop6h 38m
Deal found 10/20![Frontier logo]()
$215
This Travelocity deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:16 am -
1 stop11h 24m
Fri 11/66:34 pm -
1 stop5h 13m
Deal found 10/16![Frontier logo]()
$216
This Frontier deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/149:51 am -
1 stop13h 25m
Sun 11/1512:14 pm -
1 stop7h 01m
Deal found 10/15![Frontier logo]()
$216
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1610:45 am -
Nonstop1h 25m
Mon 11/238:30 am -
Nonstop1h 34m
Deal found 10/19![United Airlines logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:35 pm -
2 stops14h 59m
Sat 11/213:04 pm -
1 stop9h 49m
Deal found 10/16![Frontier logo]()
$219
Best flights from Illinois to St. LouisDiscover carefully curated flight deals from Illinois to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 20, 2026.
Discover carefully curated flight deals from Illinois to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 20, 2026.
This Southwest deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/216:55 pm -
2 stops5h 00m
Sun 11/228:20 am -
1 stop5h 25m
Deal found 10/16![Southwest logo]()
$196
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/126:20 am -
1 stop4h 40m
Fri 1/295:30 pm -
1 stop4h 07m
Deal found 10/16![Delta logo]()
$211
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1610:45 am -
Nonstop1h 25m
Mon 11/238:30 am -
Nonstop1h 34m
Deal found 10/19![United Airlines logo]()
$217
This Mytrip deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/186:42 pm -
2 stops15h 52m
Sat 11/213:04 pm -
2 stops17h 10m
Deal found 10/16![Frontier logo]()
$338
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1811:40 am -
1 stop5h 05m
Sat 11/217:10 pm -
1 stop5h 35m
Deal found 10/15![Southwest logo]()
$201
This United Airlines deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/89:45 pm -
Nonstop1h 14m
Fri 12/119:40 am -
Nonstop1h 36m
Deal found 10/20![United Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:05 am -
1 stop5h 15m
Tue 11/178:30 am -
1 stop3h 45m
Deal found 10/15![Southwest logo]()
$211
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/234:35 pm -
Nonstop1h 34m
Fri 11/278:30 am -
Nonstop1h 34m
Deal found 10/19![United Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:30 am -
Nonstop1h 15m
Sun 11/155:45 am -
Nonstop1h 10m
Deal found 10/15![Southwest logo]()
$245
This Delta deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:05 am -
1 stop5h 51m
Fri 11/2710:20 am -
1 stop3h 39m
Deal found 10/19![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/198:10 am -
1 stop5h 10m
Mon 11/231:05 pm -
Nonstop1h 05m
Deal found 10/19![Southwest logo]()
$267
This United Airlines deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/222:31 pm -
1 stop4h 52m
Sat 11/285:00 am -
1 stop5h 05m
Deal found 10/16![United Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/231:26 pm -
1 stop4h 00m
Mon 12/286:30 am -
1 stop5h 23m
Deal found 10/16![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/910:20 am -
1 stop2h 50m
Sat 1/1610:35 am -
1 stop3h 30m
Deal found 10/19![Southwest logo]()
$272
This United Airlines deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/302:30 pm -
1 stop4h 53m
Mon 11/25:00 am -
1 stop5h 05m
Deal found 10/16![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/611:19 am -
1 stop4h 18m
Tue 11/109:45 am -
1 stop6h 56m
Deal found 10/16![Delta logo]()
$375
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:30 am -
1 stop5h 40m
Sat 11/71:08 pm -
1 stop4h 44m
Deal found 10/19![United Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1311:10 am -
Nonstop1h 10m
Fri 11/206:40 am -
1 stop7h 00m
Deal found 10/15![Southwest logo]()
$309
This KAYAK deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/238:29 am -
1 stop4h 27m
Thu 11/266:40 am -
1 stop3h 58m
Deal found 10/17![Delta logo]()
$377
This Southwest deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2312:45 pm -
2 stops6h 25m
Fri 11/278:20 am -
1 stop5h 25m
Deal found 10/19![Southwest logo]()
$337
This Delta deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/263:47 pm -
1 stop3h 44m
Sat 11/286:40 am -
1 stop3h 59m
Deal found 10/15![Delta logo]()
$419
This United Airlines deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/59:45 pm -
Nonstop1h 35m
Sun 2/77:29 am -
Nonstop1h 31m
Deal found 10/17![United Airlines logo]()
$407
This Delta deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/263:47 pm -
1 stop3h 44m
Sun 11/296:40 am -
1 stop3h 59m
Deal found 10/15![Delta logo]()
$419
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/611:19 am -
1 stop4h 18m
Sun 11/86:47 am -
1 stop6h 12m
Deal found 10/16![Delta logo]()
$429
Last-minute flights from Illinois to St. LouisDiscover last-minute flight deals from Illinois to St. Louis. Data last updated October 20, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to St. Louis. Data last updated October 20, 2026 and is based on user searches.
This Travelocity deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:16 am -
1 stop11h 24m
Fri 11/66:34 pm -
1 stop5h 13m
Deal found 10/16![Frontier logo]()
$216
This Frontier deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:30 am -
1 stop12h 44m
Fri 11/206:05 pm -
1 stop6h 38m
Deal found 10/20![Frontier logo]()
$215
This Delta deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/149:59 am -
1 stop6h 42m
Sat 11/2110:20 am -
1 stop3h 39m
Deal found 10/16![Delta logo]()
$201
This Southwest deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:05 am -
1 stop5h 15m
Tue 11/178:30 am -
1 stop3h 45m
Deal found 10/15![Southwest logo]()
$211
This Delta deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:20 am -
1 stop4h 34m
Sat 11/144:39 pm -
1 stop3h 38m
Deal found 10/15![Delta logo]()
$211
This Frontier deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/149:51 am -
1 stop13h 25m
Sun 11/1512:14 pm -
1 stop7h 01m
Deal found 10/15![Frontier logo]()
$216
This Frontier deal was found by Cheapflights users on 10/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:30 am -
1 stop12h 44m
Sat 11/215:15 pm -
1 stop11h 55m
Deal found 10/17![Frontier logo]()
$220
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1610:45 am -
Nonstop1h 25m
Mon 11/238:30 am -
Nonstop1h 34m
Deal found 10/19![United Airlines logo]()
$217
This Kiwi.com deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/177:35 pm -
1 stop22h 07m
Thu 11/197:24 pm -
1 stop4h 49m
Deal found 10/15![Frontier logo]()
$200
This Southwest deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1810:05 am -
1 stop3h 15m
Thu 11/194:40 pm -
Nonstop1h 10m
Deal found 10/16![Southwest logo]()
$201
This Kiwi.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:35 pm -
2 stops14h 59m
Sat 11/213:04 pm -
1 stop9h 49m
Deal found 10/16![Frontier logo]()
$219
This Southwest deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/216:55 pm -
2 stops5h 00m
Sun 11/228:20 am -
1 stop5h 25m
Deal found 10/16![Southwest logo]()
$196
One-way flights from Illinois to St. LouisSearch for one-way flight options from Illinois to St. Louis. Find affordable one-way fares based on user searches. Data last updated October 20, 2026.
Search for one-way flight options from Illinois to St. Louis. Find affordable one-way fares based on user searches. Data last updated October 20, 2026.
This Southwest deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/168:45 pm -
Nonstop1h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Southwest logo]()
$72
This Priceline deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/257:49 am -
1 stop9h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![Frontier logo]()
$77
This Frontier deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/275:12 pm -
1 stop6h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/197:31 am -
1 stop11h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![Frontier logo]()
$87
This Super.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:08 am -
1 stop11h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$91
This Super.com deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:30 am -
1 stop12h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/196:08 am -
1 stop12h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![Frontier logo]()
$94
This Travelocity deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/166:30 am -
1 stop12h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Frontier logo]()
$95
This Southwest deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/276:30 am -
Nonstop1h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Southwest logo]()
$96
This United Airlines deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/273:30 pm -
Nonstop1h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![United Airlines logo]()
$96
This CheapOair deal was found by Cheapflights users on 10/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/245:40 am -
1 stop18h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/16![Frontier logo]()
$97
This American Airlines deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/302:29 pm -
Nonstop1h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![American Airlines logo]()
$98
Find flight deals from Illinois to St. Louis
Keep the following information in mind while searching for Illinois to St. Louis flight deals. Data was last updated October 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $196 (Southwest) |
One-way from | $72 (Southwest) |
Popular in | April |
Cheapest in | December |
Average price | $528 |
Good round-trip deal | $61 or less |
Good one-way deal | $167 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 20, 2026.
Use the filters below to find and compare flights from Illinois to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
ChicagoSt. Louis
MDW Chicago Midway - STL Lambert-St Louis
MDWSTL
Chicago Midway
Mon 11/16
8:45 pm-10:00 pm
Nonstop1h 15m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$72
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Fri 11/13
10:00 pm-11:24 pm
Nonstop1h 24m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$96
ChicagoSt. Louis
MDW Chicago Midway - STL Lambert-St Louis
MDWSTL
Chicago Midway
Thu 11/19
9:40 am-11:00 am
Nonstop1h 20m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$96
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Tue 3/2
10:00 pm-11:19 pm
Nonstop1h 19m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$96
ChicagoSt. Louis
MDW Chicago Midway - STL Lambert-St Louis
MDWSTL
Chicago Midway
Tue 3/2
7:50 pm-9:05 pm
Nonstop1h 15m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$96
ChicagoSt. Louis
MDW Chicago Midway - STL Lambert-St Louis
MDWSTL
Chicago Midway
Fri 11/27
6:30 pm-7:50 pm
Nonstop1h 20m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$96
ChicagoSt. Louis
MDW Chicago Midway - STL Lambert-St Louis
MDWSTL
Chicago Midway
Tue 3/2
1:00 pm-4:50 pm
1 stop3h 50m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$106
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Wed 1/13
5:20 pm-11:18 pm
1 stop5h 58m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$138
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Mon 11/16
6:30 am-7:14 pm
1 stop12h 44m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$143
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Mon 11/9
2:44 pm-8:29 pm
1 stop5h 45m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$145
Showing 1-10 of 47 resultsSorted by cheapest first
Best time to book a flight from Illinois to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Illinois with our price prediction graph.
MDW-STL
ORD-STL
MLI-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Illinois to St. Louis
USIL-STL
MDW-STL
ORD-STL
MLI-STL
What is the cheapest month to book a flight from Illinois to St. Louis?
Currently, December is the cheapest month in which you can book a flight from Illinois to St. Louis (average of $217). Flying from Illinois to St. Louis in April is currently the most expensive (average of $612). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from IL to STL?
Find hourly flight availability from Illinois to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 20, 2026.
It’s typically best to fly out from Illinois to St. Louis at noon. Doing so could potentially save you 23% on the flight price compared to flying in the evening, which is usually more expensive.
Weekly flight availability from Illinois to St. Louis
Explore weekly flight availability from Illinois to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated October 20, 2026.
The most flights from USIL to STL are scheduled on a Monday (62 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (9 on average).
How much does it cost to fly round-trip from Illinois to St. Louis?
Airfare is below average for this route at the moment.
Illinois to St. Louis flights typically cost between $316 and $658 in November.The cheapest round-trip price found within the last 5 days was $200 on Frontier (Nov 17-Nov 19).
What is the cheapest day to fly from Illinois to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Illinois to St. Louis. Price data was last updated on October 17, 2026.
Travelers seeking maximum savings on their Illinois to St. Louis flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Illinois to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Wentzville
Maryland Heights
Chesterfield
Collinsville
Edwardsville
Glencoe
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Illinois and St. Louis flights
Browse other Illinois and St. Louis flight options. Last updated on October 20, 2026.
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Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 20, 2026.
Illinois to St. Louis flights
Consider these flights traveling from Illinois to St. Louis.
Top 3 airlines flying from Illinois to St. Louis
Discover the top 3 airlines that operate flights from Illinois to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$151 | Average$401 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$187 | Average$494 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$202 | Average$505 | FlexibilityNo cancel fee | On-time69% |