$79+ Cheap flights from Missouri to Illinois
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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ORD
Oct 17 — Oct 241
Round-trip
1 adult, Economy
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Find cheap flights from Missouri to Illinois 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 Missouri to IllinoisExplore the most affordable flight options available from Missouri to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
Explore the most affordable flight options available from Missouri to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/286:44 pm -
1 stop14h 12m
Wed 11/47:15 am -
1 stop10h 25m
Deal found 9/13![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/216:35 pm -
1 stop14h 46m
Thu 10/297:50 pm -
1 stop21h 50m
Deal found 9/13![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 10/146:35 pm -
1 stop23h 10m
Wed 10/216:21 am -
1 stop11h 19m
Deal found 9/12![Frontier logo]()
$152
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 11/116:44 pm -
1 stop23h 03m
Tue 11/176:42 pm -
1 stop22h 58m
Deal found 9/14![Frontier logo]()
$154
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/126:35 pm -
1 stop16h 57m
Tue 10/137:44 pm -
1 stop21h 56m
Deal found 9/14![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/286:44 pm -
1 stop5h 03m
Wed 11/46:16 am -
1 stop11h 24m
Deal found 9/13![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 9/12. 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.
Mon 10/126:35 pm -
1 stop16h 57m
Wed 10/146:00 am -
1 stop11h 40m
Deal found 9/12![Frontier logo]()
$164
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/286:44 pm -
2 stops27h 59m
Tue 11/37:28 pm -
1 stop22h 12m
Deal found 9/16![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/52:29 pm -
1 stop21h 22m
Wed 10/76:20 am -
1 stop6h 50m
Deal found 9/14![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/52:29 pm -
1 stop9h 14m
Wed 10/76:25 am -
1 stop6h 45m
Deal found 9/14![Frontier logo]()
$170
This Expedia deal was found by Cheapflights users on 9/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:19 pm -
1 stop8h 05m
Wed 10/216:00 am -
1 stop11h 40m
Deal found 9/16![Frontier logo]()
$170
This Mytrip deal was found by Cheapflights users on 9/16. 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.
Tue 11/109:40 am -
Nonstop1h 55m
Thu 11/1211:15 am -
Nonstop1h 35m
Deal found 9/16![Contour logo]()
$180
Best flights from Missouri to IllinoisDiscover carefully curated flight deals from Missouri to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
Discover carefully curated flight deals from Missouri to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/149:40 am -
Nonstop1h 55m
Thu 10/2211:15 am -
Nonstop1h 35m
Deal found 9/15![Contour logo]()
$181
This Southwest deal was found by Cheapflights users on 9/15. 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 10/158:40 pm -
Nonstop1h 20m
Mon 10/197:50 am -
Nonstop1h 30m
Deal found 9/15![Southwest logo]()
$259
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Mon 10/510:27 am -
Nonstop1h 32m
Tue 10/66:10 pm -
Nonstop1h 31m
Deal found 9/16![United Airlines logo]()
$261
This Delta deal was found by Cheapflights users on 9/15. 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.
Tue 10/276:47 am -
1 stop6h 12m
Tue 10/275:30 pm -
1 stop5h 51m
Deal found 9/15![Delta logo]()
$263
This Booking.com deal was found by Cheapflights users on 9/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/179:40 am -
Nonstop1h 55m
Sat 10/3111:15 am -
Nonstop1h 35m
Deal found 9/12![Contour logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Wed 10/149:40 am -
Nonstop1h 55m
Sat 10/1711:15 am -
Nonstop1h 35m
Deal found 9/15![Contour logo]()
$198
This Southwest deal was found by Cheapflights users on 9/15. 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.
Tue 11/32:25 pm -
Nonstop1h 05m
Thu 11/59:25 pm -
Nonstop1h 25m
Deal found 9/15![Southwest logo]()
$261
This American Airlines deal was found by Cheapflights users on 9/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:00 am -
1 stop14h 57m
Wed 10/2111:31 am -
1 stop9h 24m
Deal found 9/16![American Airlines logo]()
$548
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:00 am -
Nonstop1h 53m
Mon 10/128:13 pm -
Nonstop1h 47m
Deal found 9/15![United Airlines logo]()
$276
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/279:50 am -
Nonstop1h 55m
Wed 9/3011:15 am -
Nonstop1h 35m
Deal found 9/13![Contour logo]()
$237
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/126:30 am -
1 stop5h 12m
Thu 1/149:30 am -
1 stop5h 11m
Deal found 9/17![Delta logo]()
$291
This Southwest deal was found by Cheapflights users on 9/16. 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 10/144:35 pm -
Nonstop1h 05m
Wed 10/218:55 pm -
Nonstop1h 10m
Deal found 9/16![Southwest logo]()
$265
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Wed 10/1411:15 am -
Nonstop1h 43m
Wed 10/219:20 pm -
Nonstop1h 35m
Deal found 9/14![United Airlines logo]()
$289
This Southwest deal was found by Cheapflights users on 9/16. 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.
Mon 10/196:10 pm -
Nonstop1h 05m
Tue 10/206:00 am -
1 stop3h 15m
Deal found 9/16![Southwest logo]()
$271
This Contour deal was found by Cheapflights users on 9/16. 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 Contour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/19:40 am -
Nonstop1h 55m
Fri 2/511:15 am -
Nonstop1h 35m
Deal found 9/16![Contour logo]()
$248
This KAYAK deal was found by Cheapflights users on 9/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:47 am -
1 stop6h 12m
Wed 10/77:00 am -
1 stop6h 53m
Deal found 9/16![Delta logo]()
$302
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2111:15 am -
Nonstop1h 43m
Wed 10/2812:45 pm -
Nonstop1h 33m
Deal found 9/15![United Airlines logo]()
$289
This Southwest deal was found by Cheapflights users on 9/16. 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.
Mon 10/510:00 pm -
Nonstop1h 10m
Tue 10/64:45 pm -
1 stop5h 45m
Deal found 9/16![Southwest logo]()
$271
This Contour deal was found by Cheapflights users on 9/17. 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 Contour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/29:40 am -
Nonstop1h 55m
Tue 10/611:15 am -
Nonstop1h 35m
Deal found 9/17![Contour logo]()
$258
This Delta deal was found by Cheapflights users on 9/12. 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 10/215:27 pm -
1 stop6h 30m
Sat 10/246:30 am -
1 stop4h 55m
Deal found 9/12![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Tue 10/610:27 am -
Nonstop1h 32m
Wed 10/77:50 pm -
Nonstop1h 31m
Deal found 9/16![United Airlines logo]()
$296
This Southwest deal was found by Cheapflights users on 9/15. 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 10/248:55 am -
2 stops6h 20m
Mon 10/267:50 am -
Nonstop1h 10m
Deal found 9/15![Southwest logo]()
$276
This Delta deal was found by Cheapflights users on 9/15. 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 10/295:27 pm -
1 stop6h 30m
Sat 10/316:30 am -
1 stop5h 36m
Deal found 9/15![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 9/12. 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.
Thu 10/226:00 am -
Nonstop2h 00m
Thu 10/294:15 pm -
Nonstop1h 50m
Deal found 9/12![United Airlines logo]()
$299
This Southwest deal was found by Cheapflights users on 9/15. 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 11/1912:20 pm -
1 stop3h 10m
Mon 11/2310:00 am -
1 stop4h 20m
Deal found 9/15![Southwest logo]()
$279
This Contour deal was found by Cheapflights users on 9/14. 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 Contour is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/289:50 am -
Nonstop1h 55m
Thu 10/111:15 am -
Nonstop1h 35m
Deal found 9/14![Contour logo]()
$283
This Delta deal was found by Cheapflights users on 9/13. 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 11/135:18 pm -
1 stop6h 36m
Sun 11/158:04 am -
1 stop6h 41m
Deal found 9/13![Delta logo]()
$319
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Wed 12/26:35 pm -
Nonstop1h 49m
Sat 12/53:55 pm -
Nonstop1h 58m
Deal found 9/14![United Airlines logo]()
$299
This Southwest deal was found by Cheapflights users on 9/13. 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 10/213:35 pm -
2 stops6h 45m
Thu 10/298:35 am -
1 stop5h 15m
Deal found 9/13![Southwest logo]()
$283
This Delta deal was found by Cheapflights users on 9/16. 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 11/135:18 pm -
1 stop5h 36m
Sun 11/156:00 am -
1 stop5h 00m
Deal found 9/16![Delta logo]()
$319
Last-minute flights from Missouri to IllinoisDiscover last-minute flight deals from Missouri to Illinois. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Missouri to Illinois. Data last updated September 17, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/52:29 pm -
1 stop21h 22m
Wed 10/76:20 am -
1 stop6h 50m
Deal found 9/14![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/52:29 pm -
1 stop9h 14m
Wed 10/76:25 am -
1 stop6h 45m
Deal found 9/14![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Mon 10/126:35 pm -
1 stop16h 57m
Tue 10/137:44 pm -
1 stop21h 56m
Deal found 9/14![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 10/146:35 pm -
1 stop23h 10m
Wed 10/216:21 am -
1 stop11h 19m
Deal found 9/12![Frontier logo]()
$152
This Expedia deal was found by Cheapflights users on 9/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:19 pm -
1 stop8h 05m
Wed 10/216:00 am -
1 stop11h 40m
Deal found 9/16![Frontier logo]()
$170
This Trip.com deal was found by Cheapflights users on 9/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/177:42 pm -
1 stop28h 42m
Wed 10/216:00 am -
1 stop11h 40m
Deal found 9/16![Frontier logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/216:35 pm -
1 stop14h 46m
Thu 10/297:50 pm -
1 stop21h 50m
Deal found 9/13![Frontier logo]()
$143
This Expedia deal was found by Cheapflights users on 9/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/238:00 pm -
1 stop28h 24m
Wed 11/47:15 am -
1 stop10h 25m
Deal found 9/15![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Fri 10/236:35 pm -
1 stop23h 56m
Thu 11/57:50 pm -
1 stop21h 50m
Deal found 9/15![Frontier logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/286:44 pm -
1 stop14h 12m
Wed 11/47:15 am -
1 stop10h 25m
Deal found 9/13![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 10/286:44 pm -
1 stop5h 03m
Wed 11/46:16 am -
1 stop11h 24m
Deal found 9/13![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/286:44 pm -
2 stops27h 59m
Tue 11/37:28 pm -
1 stop22h 12m
Deal found 9/16![Frontier logo]()
$168
One-way flights from Missouri to IllinoisSearch for one-way flight options from Missouri to Illinois. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from Missouri to Illinois. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This CheapOair deal was found by Cheapflights users on 9/16. 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.
Wed 10/286:44 pm -
1 stop5h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Fri 10/166:35 pm -
2 stops28h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$83
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/109:40 am -
Nonstop1h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Contour logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Mon 11/166:44 pm -
1 stop23h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$85
This Booking.com deal was found by Cheapflights users on 9/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/309:40 am -
Nonstop1h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Contour logo]()
$86
This Booking.com deal was found by Cheapflights users on 9/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/299:40 am -
Nonstop1h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Contour logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/146:35 pm -
1 stop5h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 9/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1612:02 pm -
1 stop6h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$90
This Mytrip deal was found by Cheapflights users on 9/13. 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.
Thu 10/159:40 am -
Nonstop1h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Contour logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 11/186:44 pm -
1 stop5h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 10/286:44 pm -
2 stops27h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Fri 11/136:44 pm -
1 stop23h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$94
Find flight deals from Missouri to Illinois
Keep the following information in mind while searching for Missouri to Illinois flight deals. Data was last updated September 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $133 (Kiwi.com) |
One-way from | $79 (CheapOair) |
Popular in | January |
Cheapest in | August |
Average price | $323 |
Good round-trip deal | $150 or less |
Good one-way deal | $213 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Missouri to Illinois 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 September 17, 2026.
Use the filters below to find and compare flights from Missouri to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Cape GirardeauChicago
CGI Cape Girardeau - ORD Chicago O'Hare Intl
CGIORD
Cape Girardeau
Sat 12/19
2:10 pm-4:05 pm
Nonstop1h 55m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$85
Cape GirardeauChicago
CGI Cape Girardeau - ORD Chicago O'Hare Intl
CGIORD
Cape Girardeau
Tue 11/10
9:40 am-11:35 am
Nonstop1h 55m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$85
Cape GirardeauChicago
CGI Cape Girardeau - ORD Chicago O'Hare Intl
CGIORD
Cape Girardeau
Fri 10/30
9:40 am-11:35 am
Nonstop1h 55m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$86
Cape GirardeauChicago
CGI Cape Girardeau - ORD Chicago O'Hare Intl
CGIORD
Cape Girardeau
Thu 10/29
9:40 am-11:35 am
Nonstop1h 55m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$90
Quickest round-trip
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Tue 10/20
5:50 am-6:55 am
Nonstop1h 05m
Chicago Midway
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$122
St. LouisChicago
STL Lambert-St Louis - ORD Chicago O'Hare Intl
STLORD
Lambert-St Louis
Tue 10/20
11:35 am-1:11 pm
Nonstop1h 36m
Chicago O'Hare Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$122
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Tue 11/3
6:20 am-7:25 am
Nonstop1h 05m
Chicago Midway
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$122
Kansas CityChicago
MCI Kansas City - MDW Chicago Midway
MCIMDW
Kansas City
Thu 10/22
8:40 pm-10:00 pm
Nonstop1h 20m
Chicago Midway
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$130
Kansas CitySt. Louis
MCI Kansas City - STL Lambert-St Louis
MCISTL
Kansas City
Sat 11/14
9:49 am-2:34 pm
1 stop4h 45m
Lambert-St Louis
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$131
St. LouisChicago
STL Lambert-St Louis - MDW Chicago Midway
STLMDW
Lambert-St Louis
Tue 11/17
2:21 pm-6:04 pm
1 stop3h 43m
Chicago Midway
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$132
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Missouri to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Missouri with our price prediction graph.
STL-MDW
STL-ORD
CGI-ORD
MCI-STL
SGF-MDW
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 Missouri to Illinois
USMO-USIL
STL-MDW
STL-ORD
CGI-ORD
MCI-STL
What is the cheapest month to book a flight from Missouri to Illinois?
Currently, December is the cheapest month in which you can book a flight from Missouri to Illinois (average of $283). Flying from Missouri to Illinois in July is currently the most expensive (average of $385). 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 MO to IL?
Find hourly flight availability from Missouri to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2026.
When flying from Missouri to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 34% versus a flight in the evening.
Weekly flight availability from Missouri to Illinois
Explore weekly flight availability from Missouri to Illinois. 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 September 17, 2026.
The most flights from USMO to USIL are scheduled on a Wednesday (61 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (37 on average).
How much does it cost to fly round-trip from Missouri to Illinois?
Airfare is below average for this route at the moment.
Missouri to Illinois flights typically cost between $183 and $526 in October.The cheapest round-trip price found within the last 5 days was $133 on Frontier (Oct 28-Nov 4).
How far ahead should I book a flight from Missouri to Illinois?
The price you pay for your flight from Missouri to Illinois may vary depending on when you book. For the best chance of a lower fare, look to book 83 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from Missouri to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Missouri to Illinois. Price data was last updated on September 12, 2026.
Travelers seeking maximum savings on their Missouri to Illinois flight should consider departing on Friday at noon when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated September 17, 2026.
Read reviews from past customers who have flown Southwest,Contour, andUnited Airlines from Missouri to Illinois. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Overall
8.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Comfort
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from Missouri to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Missouri to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Missouri to Illinois by cabin class
Find flights from Missouri to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Missouri and Illinois flights
Browse other Missouri and Illinois flight options. Last updated on September 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Illinois
Find the right flight back to Missouri after your stay in Illinois
Missouri to Illinois flights
Consider these flights traveling from Missouri to Illinois.
Top 5 airlines flying from Missouri to Illinois
Discover the top 5 airlines that operate flights from Missouri to Illinois. 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 September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$62 | Average$168 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$97 | Average$330 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$128 | Average$381 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$143 | Average$176 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$187 | Average$474 | FlexibilityNo cancel fee | On-time63% |