$85+ Cheap flights from Oklahoma City (OKC) to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
OKC — ORD
Aug 31 — Sep 71
Round-trip
1 adult, Economy
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Find cheap flights from Oklahoma City to Illinois with Cheapflights
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Cheapest flights from Oklahoma City to IllinoisExplore the most affordable flight options available from Oklahoma City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 1, 2026.
Explore the most affordable flight options available from Oklahoma City to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 1, 2026.
This CheapOair deal was found by Cheapflights users on 7/30. 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.
Thu 10/12:25 pm
OKC
- STL
1 stop20h 52m
Frontier
Fri 10/28:10 pm
STL
- OKC
1 stop23h 25m
Frontier
Deal found 7/30![Frontier logo]()
$203
This CheapOair deal was found by Cheapflights users on 8/1. 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.
Thu 9/178:30 pm
OKC
- STL
1 stop22h 47m
Frontier
Sat 9/1912:17 pm
STL
- OKC
1 stop25h 20m
Frontier
Deal found 8/1![Frontier logo]()
$204
This CheapOair deal was found by Cheapflights users on 7/31. 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.
Thu 9/178:30 pm
OKC
- STL
1 stop22h 47m
Frontier
Mon 9/218:10 pm
STL
- OKC
1 stop23h 25m
Frontier
Deal found 7/31![Frontier logo]()
$229
This CheapOair deal was found by Cheapflights users on 7/30. 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.
Fri 9/188:30 pm
OKC
- STL
1 stop22h 47m
Frontier
Sun 9/2012:27 pm
STL
- OKC
1 stop25h 10m
Frontier
Deal found 7/30![Frontier logo]()
$250
This CheapOair deal was found by Cheapflights users on 7/28. 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.
Thu 11/121:56 pm
OKC
- STL
1 stop5h 19m
Frontier
Sat 11/145:32 pm
STL
- OKC
1 stop18h 01m
Frontier
Deal found 7/28![Frontier logo]()
$253
This Southwest deal was found by Cheapflights users on 7/27. 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 8/242:10 pm
OKC
- STL
1 stop5h 00m
Southwest
Mon 8/318:25 am
STL
- OKC
1 stop5h 05m
Southwest
Deal found 7/27![Southwest logo]()
$257
This CheapOair deal was found by Cheapflights users on 7/30. 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.
Thu 9/248:30 pm
OKC
- STL
1 stop22h 47m
Frontier
Sun 9/2712:27 pm
STL
- OKC
1 stop25h 10m
Frontier
Deal found 7/30![Frontier logo]()
$259
This CheapOair deal was found by Cheapflights users on 7/29. 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 10/78:30 pm
OKC
- STL
1 stop22h 45m
Frontier
Fri 10/98:10 pm
STL
- OKC
1 stop16h 51m
Frontier
Deal found 7/29![Frontier logo]()
$260
This Southwest deal was found by Cheapflights users on 7/30. 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 8/2512:05 pm
OKC
- STL
1 stop5h 50m
Southwest
Tue 9/12:50 pm
STL
- OKC
2 stops5h 55m
Southwest
Deal found 7/30![Southwest logo]()
$262
This Southwest deal was found by Cheapflights users on 7/29. 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 9/167:15 am
OKC
- MDW
2 stops8h 50m
Southwest
Sat 9/196:50 am
MDW
- OKC
1 stop6h 55m
Southwest
Deal found 7/29![Southwest logo]()
$262
This United Airlines deal was found by Cheapflights users on 7/29. 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 9/37:19 am
OKC
- ORD
Nonstop2h 26m
United Airlines
Sat 9/58:35 pm
ORD
- OKC
Nonstop2h 21m
United Airlines
Deal found 7/29![United Airlines logo]()
$262
This CheapOair deal was found by Cheapflights users on 7/31. 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.
Fri 9/118:30 pm
OKC
- ORD
1 stop27h 53m
Frontier
Sun 9/138:55 pm
ORD
- OKC
1 stop16h 42m
Frontier
Deal found 7/31![Frontier logo]()
$263
Best flights from Oklahoma City to IllinoisDiscover carefully curated flight deals from Oklahoma City to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 1, 2026.
Discover carefully curated flight deals from Oklahoma City to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 1, 2026.
This CheapOair deal was found by Cheapflights users on 7/27. 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 8/117:16 pm
OKC
- STL
1 stop24h 07m
Frontier
Sat 8/158:08 pm
STL
- OKC
1 stop18h 51m
Frontier
Deal found 7/27![Frontier logo]()
$250
This Southwest deal was found by Cheapflights users on 7/30. 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 8/207:10 am
OKC
- STL
1 stop5h 55m
Southwest
Tue 8/252:50 pm
STL
- OKC
2 stops5h 55m
Southwest
Deal found 7/30![Southwest logo]()
$262
This United Airlines deal was found by Cheapflights users on 7/29. 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 9/37:19 am
OKC
- ORD
Nonstop2h 26m
United Airlines
Sat 9/58:35 pm
ORD
- OKC
Nonstop2h 21m
United Airlines
Deal found 7/29![United Airlines logo]()
$262
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Sat 9/195:00 am
OKC
- PIA
1 stop6h 44m
American Airlines
Sat 9/2612:17 pm
PIA
- OKC
1 stop6h 17m
American Airlines
Deal found 7/29![American Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 7/31. 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 9/511:40 am
OKC
- ORD
1 stop6h 01m
Delta
Sun 9/65:30 am
ORD
- OKC
1 stop5h 30m
Delta
Deal found 7/31![Delta logo]()
$335
This Southwest deal was found by Cheapflights users on 7/29. 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 9/169:05 am
OKC
- MDW
2 stops6h 25m
Southwest
Mon 9/215:30 pm
MDW
- OKC
1 stop5h 25m
Southwest
Deal found 7/29![Southwest logo]()
$262
This United Airlines deal was found by Cheapflights users on 7/30. 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 9/45:45 pm
OKC
- ORD
Nonstop2h 31m
United Airlines
Mon 9/79:25 am
ORD
- OKC
Nonstop2h 22m
United Airlines
Deal found 7/30![United Airlines logo]()
$285
This Southwest deal was found by Cheapflights users on 7/29. 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 8/256:50 am
OKC
- STL
2 stops5h 50m
Southwest
Tue 9/12:50 pm
STL
- OKC
2 stops5h 55m
Southwest
Deal found 7/29![Southwest logo]()
$267
This Southwest deal was found by Cheapflights users on 7/29. 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 9/1612:05 pm
OKC
- MDW
2 stops8h 40m
Southwest
Sat 9/196:35 am
MDW
- OKC
2 stops7h 10m
Southwest
Deal found 7/29![Southwest logo]()
$267
This United Airlines deal was found by Cheapflights users on 7/29. 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 10/215:00 am
OKC
- MLI
2 stops7h 37m
United Airlines
Sat 10/2410:49 am
MLI
- OKC
2 stops9h 16m
United Airlines
Deal found 7/29![United Airlines logo]()
$295
This Delta deal was found by Cheapflights users on 7/31. 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 8/205:20 am
OKC
- STL
1 stop4h 34m
Delta
Mon 8/245:23 pm
STL
- OKC
1 stop5h 33m
Delta
Deal found 7/31![Delta logo]()
$342
This Southwest deal was found by Cheapflights users on 7/31. 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 8/263:20 pm
OKC
- MDW
Nonstop1h 50m
Southwest
Thu 8/271:05 pm
MDW
- OKC
2 stops9h 05m
Southwest
Deal found 7/31![Southwest logo]()
$276
This United Airlines deal was found by Cheapflights users on 7/29. 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 10/53:00 pm
OKC
- STL
1 stop7h 30m
United Airlines
Tue 10/61:36 pm
STL
- OKC
1 stop6h 29m
United Airlines
Deal found 7/29![United Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 7/30. 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 9/243:30 pm
OKC
- MDW
Nonstop1h 50m
Southwest
Mon 9/288:55 pm
MDW
- OKC
Nonstop2h 05m
Southwest
Deal found 7/30![Southwest logo]()
$285
This United Airlines deal was found by Cheapflights users on 7/27. 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 8/191:30 pm
OKC
- ORD
Nonstop2h 21m
United Airlines
Sun 8/239:00 pm
ORD
- OKC
Nonstop2h 19m
United Airlines
Deal found 7/27![United Airlines logo]()
$331
This Southwest deal was found by Cheapflights users on 7/31. 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 9/107:40 am
OKC
- MDW
2 stops9h 25m
Southwest
Mon 9/1412:00 pm
MDW
- OKC
1 stop6h 25m
Southwest
Deal found 7/31![Southwest logo]()
$286
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Fri 8/147:09 pm
OKC
- EVV
1 stop4h 50m
American Airlines
Wed 8/1912:20 pm
EVV
- OKC
1 stop4h 55m
American Airlines
Deal found 7/29![American Airlines logo]()
$477
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Sat 9/127:19 am
OKC
- STL
1 stop6h 56m
United Airlines
Tue 9/2211:15 am
STL
- OKC
2 stops8h 41m
United Airlines
Deal found 7/28![United Airlines logo]()
$332
This Delta deal was found by Cheapflights users on 7/30. 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 8/285:12 pm
OKC
- BMI
1 stop6h 04m
Delta
Fri 9/44:24 pm
BMI
- OKC
1 stop7h 34m
Delta
Deal found 7/30![Delta logo]()
$467
This Southwest deal was found by Cheapflights users on 8/1. 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 10/292:00 pm
OKC
- MDW
2 stops6h 55m
Southwest
Mon 11/212:55 pm
MDW
- OKC
2 stops9h 30m
Southwest
Deal found 8/1![Southwest logo]()
$291
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Fri 8/144:38 pm
OKC
- EVV
1 stop6h 49m
American Airlines
Thu 8/205:01 pm
EVV
- OKC
1 stop6h 58m
American Airlines
Deal found 7/27![American Airlines logo]()
$477
This United Airlines deal was found by Cheapflights users on 7/28. 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 9/232:38 pm
OKC
- STL
2 stops8h 21m
United Airlines
Mon 9/281:29 pm
STL
- OKC
2 stops9h 46m
United Airlines
Deal found 7/28![United Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 7/29. 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 8/314:25 pm
OKC
- STL
1 stop5h 25m
Southwest
Thu 9/38:30 am
STL
- OKC
2 stops6h 50m
Southwest
Deal found 7/29![Southwest logo]()
$293
This United Airlines deal was found by Cheapflights users on 7/30. 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 8/141:30 pm
OKC
- PIA
1 stop5h 33m
United Airlines
Tue 8/188:29 am
PIA
- OKC
2 stops9h 41m
United Airlines
Deal found 7/30![United Airlines logo]()
$354
This Southwest deal was found by Cheapflights users on 8/1. 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 9/175:15 am
OKC
- STL
1 stop5h 15m
Southwest
Sat 9/192:05 pm
STL
- OKC
2 stops7h 05m
Southwest
Deal found 8/1![Southwest logo]()
$298
This American Airlines deal was found by Cheapflights users on 7/30. 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.
Fri 8/2811:11 am
OKC
- BMI
1 stop12h 48m
American Airlines
Fri 9/45:00 am
BMI
- OKC
2 stops10h 53m
American Airlines
Deal found 7/30![American Airlines logo]()
$576
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Sat 9/195:00 am
OKC
- PIA
2 stops8h 39m
United Airlines
Sat 9/268:30 am
PIA
- OKC
2 stops7h 37m
United Airlines
Deal found 7/29![United Airlines logo]()
$362
This Southwest deal was found by Cheapflights users on 7/31. 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 9/57:00 am
OKC
- MDW
2 stops6h 20m
Southwest
Sun 9/68:10 am
MDW
- OKC
1 stop7h 10m
Southwest
Deal found 7/31![Southwest logo]()
$310
This American Airlines deal was found by Cheapflights users on 7/29. 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.
Thu 8/134:38 pm
OKC
- BMI
1 stop6h 15m
American Airlines
Mon 8/171:46 pm
BMI
- OKC
1 stop4h 37m
American Airlines
Deal found 7/29![American Airlines logo]()
$587
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Sat 10/311:18 pm
OKC
- MLI
1 stop4h 15m
United Airlines
Tue 11/38:15 am
MLI
- OKC
1 stop7h 50m
United Airlines
Deal found 7/30![United Airlines logo]()
$365
Last-minute flights from Oklahoma City to IllinoisDiscover last-minute flight deals from Oklahoma City to Illinois. Data last updated August 1, 2026 and is based on user searches.
Discover last-minute flight deals from Oklahoma City to Illinois. Data last updated August 1, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 7/27. 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 8/117:16 pm
OKC
- STL
1 stop24h 07m
Frontier
Sat 8/158:08 pm
STL
- OKC
1 stop18h 51m
Frontier
Deal found 7/27![Frontier logo]()
$250
This Southwest deal was found by Cheapflights users on 7/28. 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 8/201:10 pm
OKC
- MDW
1 stop6h 55m
Southwest
Mon 8/241:05 pm
MDW
- OKC
2 stops9h 05m
Southwest
Deal found 7/28![Southwest logo]()
$262
This Southwest deal was found by Cheapflights users on 7/30. 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 8/2212:35 pm
OKC
- MDW
2 stops6h 35m
Southwest
Tue 8/2511:10 am
MDW
- OKC
2 stops7h 20m
Southwest
Deal found 7/30![Southwest logo]()
$267
This Southwest deal was found by Cheapflights users on 7/28. 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 8/229:00 am
OKC
- MDW
2 stops8h 05m
Southwest
Thu 8/2710:05 am
MDW
- OKC
1 stop5h 45m
Southwest
Deal found 7/28![Southwest logo]()
$274
This Southwest deal was found by Cheapflights users on 7/27. 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 8/242:10 pm
OKC
- STL
1 stop5h 00m
Southwest
Mon 8/318:25 am
STL
- OKC
1 stop5h 05m
Southwest
Deal found 7/27![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 7/30. 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 8/2512:05 pm
OKC
- STL
1 stop5h 50m
Southwest
Tue 9/12:50 pm
STL
- OKC
2 stops5h 55m
Southwest
Deal found 7/30![Southwest logo]()
$262
This Southwest deal was found by Cheapflights users on 7/31. 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 8/265:45 am
OKC
- MDW
Nonstop2h 00m
Southwest
Thu 8/272:05 pm
MDW
- OKC
1 stop4h 55m
Southwest
Deal found 7/31![Southwest logo]()
$271
This American Airlines deal was found by Cheapflights users on 7/31. 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 8/264:38 pm
OKC
- ORD
1 stop6h 52m
American Airlines
Thu 8/276:40 pm
ORD
- OKC
Nonstop2h 20m
American Airlines
Deal found 7/31![American Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 7/31. 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 8/265:12 pm
OKC
- MDW
1 stop5h 24m
Delta
Sat 8/296:11 am
MDW
- OKC
1 stop4h 49m
Delta
Deal found 7/31![Delta logo]()
$281
This Delta deal was found by Cheapflights users on 8/1. 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 8/265:12 pm
OKC
- ORD
1 stop6h 45m
Delta
Sat 8/298:05 am
ORD
- OKC
1 stop6h 49m
Delta
Deal found 8/1![Delta logo]()
$281
This Southwest deal was found by Cheapflights users on 7/29. 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 8/277:10 am
OKC
- STL
1 stop5h 55m
Southwest
Thu 9/38:30 am
STL
- OKC
2 stops6h 50m
Southwest
Deal found 7/29![Southwest logo]()
$293
This Southwest deal was found by Cheapflights users on 7/28. 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 8/311:10 pm
OKC
- STL
2 stops6h 45m
Southwest
Wed 9/22:50 pm
STL
- OKC
2 stops5h 55m
Southwest
Deal found 7/28![Southwest logo]()
$290
One-way flights from Oklahoma City to IllinoisSearch for one-way flight options from Oklahoma City to Illinois. Find affordable one-way fares based on user searches. Data last updated August 1, 2026.
Search for one-way flight options from Oklahoma City to Illinois. Find affordable one-way fares based on user searches. Data last updated August 1, 2026.
This Travelocity deal was found by Cheapflights users on 7/29. 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.
Thu 10/291:56 pm
OKC
- ORD
1 stop20h 05m
Frontier
Deal found 7/29![Frontier logo]()
$85
This CheapOair deal was found by Cheapflights users on 7/29. 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.
Sat 9/58:20 pm
OKC
- STL
1 stop22h 53m
Frontier
Deal found 7/29![Frontier logo]()
$90
This CheapOair deal was found by Cheapflights users on 7/29. 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 9/98:30 pm
OKC
- ORD
1 stop27h 53m
Frontier
Deal found 7/29![Frontier logo]()
$90
This iWofly deal was found by Cheapflights users on 7/31. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:25 pm
OKC
- ORD
1 stop15h 13m
Frontier
Deal found 7/31![Frontier logo]()
$97
This Trip.com deal was found by Cheapflights users on 8/1. 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.
Mon 8/313:44 pm
OKC
- ORD
1 stop21h 52m
Frontier
Deal found 8/1![Frontier logo]()
$99
This Trip.com deal was found by Cheapflights users on 7/31. 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 9/128:30 pm
OKC
- ORD
1 stop27h 53m
Frontier
Deal found 7/31![Frontier logo]()
$100
This Southwest deal was found by Cheapflights users on 7/28. 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 8/255:45 am
OKC
- MDW
Nonstop2h 00m
Southwest
Deal found 7/28![Southwest logo]()
$119
This United Airlines deal was found by Cheapflights users on 7/28. 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 8/279:15 am
OKC
- ORD
Nonstop2h 35m
United Airlines
Deal found 7/28![United Airlines logo]()
$119
This American Airlines deal was found by Cheapflights users on 7/28. 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.
Tue 8/258:08 am
OKC
- ORD
Nonstop2h 27m
American Airlines
Deal found 7/28![American Airlines logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 10/309:24 am
OKC
- MDW
1 stop10h 44m
Allegiant Air
Deal found 8/1![Allegiant Air logo]()
$122
This Expedia deal was found by Cheapflights users on 7/31. 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 10/301:56 pm
OKC
- ORD
1 stop20h 05m
Frontier
Deal found 7/31![Frontier logo]()
$123
This Southwest deal was found by Cheapflights users on 7/29. 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 9/113:30 pm
OKC
- MDW
Nonstop1h 50m
Southwest
Deal found 7/29![Southwest logo]()
$124
Find flight deals from Oklahoma City to Illinois
Keep the following information in mind while searching for Oklahoma City to Illinois flight deals. Data was last updated August 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $203 (CheapOair) |
One-way from | $85 (Travelocity) |
Popular in | June |
Cheapest in | September |
Average price | $347 |
Good round-trip deal | $349 or less |
Good one-way deal | $187 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Oklahoma City 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 2,558,603 searches. Data last updated August 1, 2026.
Use the filters below to find and compare flights from Oklahoma City to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Oklahoma CitySt. Louis
OKC - STL
OKCSTL
Oklahoma City Will Rogers World
Tue 8/11
7:16 pm-7:23 pm
1 stop24h 07m
Lambert-St Louis
Sat 8/15
8:08 pm-2:59 pm
1 stop18h 51m
$250
Oklahoma CitySt. Louis
OKC - STL
OKCSTL
Oklahoma City Will Rogers World
Thu 8/20
7:10 am-1:05 pm
1 stop5h 55m
Lambert-St Louis
Tue 8/25
2:50 pm-8:45 pm
2 stops5h 55m
$262
Oklahoma CityChicago
OKC - ORD
OKCORD
Oklahoma City Will Rogers World
Thu 9/3
7:19 am-9:45 am
Nonstop2h 26m
Chicago O'Hare Intl
Sat 9/5
8:35 pm-10:56 pm
Nonstop2h 21m
$262
Oklahoma CityChicago
OKC - MDW
OKCMDW
Oklahoma City Will Rogers World
Wed 9/16
9:05 am-3:30 pm
2 stops6h 25m
Chicago Midway
Mon 9/21
5:30 pm-10:55 pm
1 stop5h 25m
$262
Oklahoma CitySt. Louis
OKC - STL
OKCSTL
Oklahoma City Will Rogers World
Tue 8/25
6:50 am-12:40 pm
2 stops5h 50m
Lambert-St Louis
Tue 9/1
2:50 pm-8:45 pm
2 stops5h 55m
$267
Oklahoma CityChicago
OKC - MDW
OKCMDW
Oklahoma City Will Rogers World
Wed 9/16
12:05 pm-8:45 pm
2 stops8h 40m
Chicago Midway
Sat 9/19
6:35 am-1:45 pm
2 stops7h 10m
$267
Oklahoma CityChicago
OKC - MDW
OKCMDW
Oklahoma City Will Rogers World
Wed 8/26
3:20 pm-5:10 pm
Nonstop1h 50m
Chicago Midway
Thu 8/27
1:05 pm-10:10 pm
2 stops9h 05m
$276
Oklahoma CityChicago
OKC - ORD
OKCORD
Oklahoma City Will Rogers World
Fri 9/4
5:45 pm-8:16 pm
Nonstop2h 31m
Chicago O'Hare Intl
Mon 9/7
9:25 am-11:47 am
Nonstop2h 22m
$285
Quickest round-trip
Oklahoma CityChicago
OKC - MDW
OKCMDW
Oklahoma City Will Rogers World
Thu 9/24
3:30 pm-5:20 pm
Nonstop1h 50m
Chicago Midway
Mon 9/28
8:55 pm-11:00 pm
Nonstop2h 05m
$285
Oklahoma CityChicago
OKC - MDW
OKCMDW
Oklahoma City Will Rogers World
Thu 9/10
7:40 am-5:05 pm
2 stops9h 25m
Chicago Midway
Mon 9/14
12:00 pm-6:25 pm
1 stop6h 25m
$286
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Oklahoma City to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Oklahoma City with our price prediction graph.
OKC-STL
OKC-MDW
OKC-ORD
OKC-PIA
OKC-MLI
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 Oklahoma City to Illinois
OKC-USIL
OKC-STL
OKC-MDW
OKC-ORD
OKC-PIA
What is the cheapest month to book a flight from Oklahoma City to Illinois?
Currently, September is the cheapest month in which you can book a flight from Oklahoma City to Illinois (average of $298). Flying from Oklahoma City to Illinois in July is currently the most expensive (average of $446). 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 OKC to IL?
Find hourly flight availability from Oklahoma City 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 August 1, 2026.
It’s optimal to fly from Oklahoma City to Illinois in the morning. By choosing this option you can save up to 25% on the cost of your flight, compared to a flight at noon.
Weekly flight availability from Oklahoma City to Illinois
Explore weekly flight availability from Oklahoma City 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 August 1, 2026.
The most flights from OKC to USIL are scheduled on a Friday (29 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (11 on average).
How much does it cost to fly round-trip from Oklahoma City to Illinois?
Airfare is below average for this route at the moment.
Oklahoma City to Illinois flights typically cost between $296 and $404 in September.The cheapest round-trip price found within the last 5 days was $262 on United Airlines (Sep 3-Sep 5).
How far ahead should I book a flight from Oklahoma City to Illinois?
The best time to book flights from Oklahoma City to Illinois is 76 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest day to fly from Oklahoma City to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Oklahoma City to Illinois. Price data was last updated on July 25, 2026.
Travelers seeking maximum savings on their Oklahoma City to Illinois flight should consider departing on Tuesday 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.
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 August 1, 2026.
Peruse reviews from past customers who have flown with Southwest,United Airlines, andAmerican Airlines from Oklahoma City to Illinois to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Overall
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 Oklahoma City to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Oklahoma City 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.
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Find flights from Oklahoma City to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Oklahoma City and Illinois flights
Browse other Oklahoma City and Illinois flight options. Last updated on August 1, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Oklahoma City to Illinois flights
Consider these flights traveling from Oklahoma City to Illinois.
Top 4 airlines flying from Oklahoma City to Illinois
Discover the top 4 airlines that operate flights from Oklahoma City 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 2,558,603 searches. Data last updated August 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$151 | Average$182 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$237 | Average$487 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$425 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$248 | Average$391 | FlexibilityNo cancel fee | On-time69% |