$84+ Cheap flights from Buffalo (BUF) 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 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Jul 16 — Jul 231
Round-trip
1 adult, Economy
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Cheapest flights from Buffalo to IllinoisExplore the most affordable flight options available from Buffalo to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 16, 2026.
Explore the most affordable flight options available from Buffalo to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 7/292:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Sun 8/26:34 pm
STL
- BUF
1 stop18h 19m
Frontier
Deal found 6/14![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 8/282:50 pm
BUF
- STL
1 stop19h 02m
Frontier
Mon 8/315:33 pm
STL
- BUF
1 stop16h 07m
Frontier
Deal found 6/11![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 7/222:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Tue 8/116:34 pm
STL
- BUF
1 stop18h 19m
Frontier
Deal found 6/14![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 6/14. 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.
Tue 7/2111:29 am
BUF
- STL
1 stop7h 08m
Frontier
Thu 7/236:34 pm
STL
- BUF
1 stop18h 19m
Frontier
Deal found 6/14![Frontier logo]()
$209
This American Airlines deal was found by Cheapflights users on 6/11. 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 10/2011:57 am
BUF
- STL
1 stop5h 14m
American Airlines
Sat 10/246:28 pm
STL
- BUF
1 stop3h 58m
American Airlines
Deal found 6/11![American Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 6/11. 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 10/2010:10 am
BUF
- STL
2 stops6h 40m
Southwest
Sat 10/249:20 am
STL
- BUF
1 stop3h 50m
Southwest
Deal found 6/11![Southwest logo]()
$252
This Southwest deal was found by Cheapflights users on 6/11. 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 12/121:10 pm
BUF
- MDW
1 stop4h 20m
Southwest
Tue 12/158:10 am
MDW
- BUF
Nonstop1h 35m
Southwest
Deal found 6/11![Southwest logo]()
$256
This Super.com deal was found by Cheapflights users on 6/15. 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.
Sat 8/83:52 pm
BUF
- ORD
1 stop7h 03m
JetBlue
Sun 8/99:39 am
ORD
- BUF
1 stop8h 15m
JetBlue
Deal found 6/15![JetBlue logo]()
$256
This Trip.com deal was found by Cheapflights users on 6/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/152:48 pm
BUF
- MDW
1 stop8h 15m
Frontier
Mon 7/206:05 am
MDW
- BUF
1 stop6h 48m
Frontier
Deal found 6/12![Frontier logo]()
$257
This JetBlue deal was found by Cheapflights users on 6/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/303:52 pm
BUF
- ORD
1 stop7h 03m
JetBlue
Sat 9/51:55 pm
ORD
- BUF
1 stop8h 37m
JetBlue
Deal found 6/14![JetBlue logo]()
$257
This Trip.com deal was found by Cheapflights users on 6/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/272:48 pm
BUF
- MDW
1 stop8h 15m
Frontier
Fri 7/316:05 am
MDW
- BUF
1 stop6h 48m
Frontier
Deal found 6/12![Frontier logo]()
$258
This Super.com deal was found by Cheapflights users on 6/11. 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 7/96:00 am
BUF
- ORD
1 stop5h 06m
JetBlue
Thu 7/166:00 am
ORD
- BUF
1 stop7h 59m
JetBlue
Deal found 6/11![JetBlue logo]()
$258
Best flights from Buffalo to IllinoisDiscover carefully curated flight deals from Buffalo to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 16, 2026.
Discover carefully curated flight deals from Buffalo to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 16, 2026.
This United Airlines deal was found by Cheapflights users on 6/11. 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 8/76:04 pm
BUF
- ORD
Nonstop1h 59m
United Airlines
Tue 8/112:07 pm
ORD
- BUF
Nonstop1h 49m
United Airlines
Deal found 6/11![United Airlines logo]()
$285
This Delta deal was found by Cheapflights users on 6/11. 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 12/113:50 pm
BUF
- MDW
1 stop3h 47m
Delta
Tue 12/159:30 am
MDW
- BUF
1 stop4h 41m
Delta
Deal found 6/11![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 6/13. 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.
Fri 8/287:10 pm
BUF
- MDW
Nonstop1h 35m
Southwest
Tue 9/18:40 am
MDW
- BUF
Nonstop1h 40m
Southwest
Deal found 6/13![Southwest logo]()
$303
This American Airlines deal was found by Cheapflights users on 6/15. 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.
Fri 7/36:27 am
BUF
- MLI
1 stop5h 46m
American Airlines
Mon 7/66:50 pm
MLI
- BUF
1 stop4h 09m
American Airlines
Deal found 6/15![American Airlines logo]()
$324
This JetBlue deal was found by Cheapflights users on 6/13. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/73:32 pm
BUF
- ORD
1 stop7h 23m
JetBlue
Sun 8/96:00 am
ORD
- BUF
1 stop7h 57m
JetBlue
Deal found 6/13![JetBlue logo]()
$336
This CheapOair deal was found by Cheapflights users on 6/11. 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 7/177:57 pm
BUF
- STL
1 stop29h 02m
Frontier
Sun 7/194:09 pm
STL
- BUF
1 stop25h 57m
Frontier
Deal found 6/11![Frontier logo]()
$378
This United Airlines deal was found by Cheapflights users on 6/11. 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 9/12:26 pm
BUF
- ORD
Nonstop2h 04m
United Airlines
Wed 9/26:49 am
ORD
- BUF
Nonstop1h 39m
United Airlines
Deal found 6/11![United Airlines logo]()
$291
This Southwest deal was found by Cheapflights users on 6/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/15:25 pm
BUF
- MDW
1 stop6h 05m
Southwest
Wed 8/58:40 am
MDW
- BUF
Nonstop1h 40m
Southwest
Deal found 6/12![Southwest logo]()
$313
This Delta deal was found by Cheapflights users on 6/12. 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.
Sat 8/16:29 am
BUF
- MDW
1 stop3h 44m
Delta
Tue 8/46:42 pm
MDW
- BUF
1 stop4h 16m
Delta
Deal found 6/12![Delta logo]()
$323
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/166:04 pm
BUF
- ORD
Nonstop1h 59m
United Airlines
Tue 7/211:55 pm
ORD
- BUF
Nonstop1h 46m
United Airlines
Deal found 6/11![United Airlines logo]()
$301
This Southwest deal was found by Cheapflights users on 6/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/612:30 pm
BUF
- MDW
2 stops8h 00m
Southwest
Mon 8/103:15 pm
MDW
- BUF
1 stop6h 00m
Southwest
Deal found 6/14![Southwest logo]()
$324
This United Airlines deal was found by Cheapflights users on 6/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/285:58 pm
BUF
- ORD
Nonstop2h 02m
United Airlines
Tue 9/12:07 pm
ORD
- BUF
Nonstop1h 49m
United Airlines
Deal found 6/13![United Airlines logo]()
$303
This Delta deal was found by Cheapflights users on 6/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/156:20 am
BUF
- STL
1 stop4h 09m
Delta
Fri 9/185:57 pm
STL
- BUF
1 stop4h 57m
Delta
Deal found 6/14![Delta logo]()
$345
This Southwest deal was found by Cheapflights users on 6/11. 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 7/296:25 am
BUF
- MDW
1 stop9h 50m
Southwest
Sat 8/16:30 am
MDW
- BUF
1 stop7h 20m
Southwest
Deal found 6/11![Southwest logo]()
$326
This American Airlines deal was found by Cheapflights users on 6/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/275:25 pm
BUF
- STL
1 stop4h 56m
American Airlines
Tue 7/281:25 pm
STL
- BUF
1 stop9h 34m
American Airlines
Deal found 6/14![American Airlines logo]()
$432
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Tue 8/115:58 pm
BUF
- ORD
Nonstop2h 02m
United Airlines
Wed 8/126:15 pm
ORD
- BUF
Nonstop1h 52m
United Airlines
Deal found 6/12![United Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 6/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/15:25 am
BUF
- MDW
2 stops7h 35m
Southwest
Tue 8/412:45 pm
MDW
- BUF
2 stops7h 20m
Southwest
Deal found 6/12![Southwest logo]()
$333
This Delta deal was found by Cheapflights users on 6/11. 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 8/16:29 am
BUF
- STL
1 stop4h 02m
Delta
Mon 8/36:25 pm
STL
- BUF
1 stop4h 33m
Delta
Deal found 6/11![Delta logo]()
$383
This Southwest deal was found by Cheapflights users on 6/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:00 am
BUF
- MDW
1 stop6h 00m
Southwest
Sun 7/267:45 am
MDW
- BUF
Nonstop1h 35m
Southwest
Deal found 6/12![Southwest logo]()
$333
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Sun 8/2310:30 am
BUF
- ORD
Nonstop1h 59m
United Airlines
Thu 8/276:49 am
ORD
- BUF
Nonstop1h 39m
United Airlines
Deal found 6/12![United Airlines logo]()
$344
This American Airlines deal was found by Cheapflights users on 6/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/246:09 pm
BUF
- MLI
1 stop6h 59m
American Airlines
Fri 8/286:45 pm
MLI
- BUF
1 stop13h 54m
American Airlines
Deal found 6/13![American Airlines logo]()
$461
This Southwest deal was found by Cheapflights users on 6/15. 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.
Mon 8/107:10 pm
BUF
- MDW
Nonstop1h 35m
Southwest
Mon 8/176:20 pm
MDW
- BUF
Nonstop1h 30m
Southwest
Deal found 6/15![Southwest logo]()
$334
This United Airlines deal was found by Cheapflights users on 6/14. 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.
Thu 7/1610:57 am
BUF
- ORD
Nonstop2h 00m
United Airlines
Fri 7/171:55 pm
ORD
- BUF
Nonstop1h 46m
United Airlines
Deal found 6/14![United Airlines logo]()
$349
This Delta deal was found by Cheapflights users on 6/15. 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 7/76:05 am
BUF
- MLI
2 stops11h 20m
Delta
Mon 7/1311:08 am
MLI
- BUF
2 stops12h 38m
Delta
Deal found 6/15![Delta logo]()
$423
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/1510:57 am
BUF
- ORD
Nonstop2h 00m
United Airlines
Sat 7/186:12 pm
ORD
- BUF
1 stop4h 47m
United Airlines
Deal found 6/11![United Airlines logo]()
$361
This Delta deal was found by Cheapflights users on 6/13. 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.
Mon 8/246:05 am
BUF
- MLI
1 stop5h 20m
Delta
Fri 8/285:09 pm
MLI
- BUF
2 stops30h 31m
Delta
Deal found 6/13![Delta logo]()
$440
This United Airlines deal was found by Cheapflights users on 6/11. 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 9/156:00 am
BUF
- STL
2 stops10h 38m
United Airlines
Fri 9/188:50 am
STL
- BUF
1 stop7h 06m
United Airlines
Deal found 6/11![United Airlines logo]()
$372
This Southwest deal was found by Cheapflights users on 6/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/12:40 pm
BUF
- STL
2 stops8h 10m
Southwest
Mon 8/311:25 am
STL
- BUF
2 stops6h 50m
Southwest
Deal found 6/12![Southwest logo]()
$425
This United Airlines deal was found by Cheapflights users on 6/11. 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 8/115:58 pm
BUF
- STL
1 stop5h 02m
United Airlines
Wed 8/1212:59 pm
STL
- BUF
1 stop7h 08m
United Airlines
Deal found 6/11![United Airlines logo]()
$384
This American Airlines deal was found by Cheapflights users on 6/15. 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.
Sun 6/284:47 pm
BUF
- MLI
1 stop7h 43m
American Airlines
Thu 7/211:43 am
MLI
- BUF
2 stops9h 12m
American Airlines
Deal found 6/15![American Airlines logo]()
$787
Last-minute flights from Buffalo to IllinoisDiscover last-minute flight deals from Buffalo to Illinois. Data last updated June 16, 2026 and is based on user searches.
Discover last-minute flight deals from Buffalo to Illinois. Data last updated June 16, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 6/15. 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.
Fri 7/32:50 pm
BUF
- ORD
1 stop6h 00m
Multiple Airlines
Sat 7/410:12 am
ORD
- BUF
1 stop8h 01m
Multiple Airlines
Deal found 6/15![Multiple Airlines logo]()
$261
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/310:07 am
BUF
- ORD
Nonstop2h 02m
American Airlines
Sat 7/48:29 am
ORD
- BUF
1 stop4h 50m
American Airlines
Deal found 6/12![American Airlines logo]()
$263
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/33:32 pm
BUF
- ORD
1 stop6h 58m
JetBlue
Sat 7/45:22 pm
ORD
- BUF
1 stop5h 51m
JetBlue
Deal found 6/15![JetBlue logo]()
$264
This Super.com deal was found by Cheapflights users on 6/11. 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 7/96:00 am
BUF
- ORD
1 stop5h 06m
JetBlue
Thu 7/166:00 am
ORD
- BUF
1 stop7h 59m
JetBlue
Deal found 6/11![JetBlue logo]()
$258
This Expedia deal was found by Cheapflights users on 6/11. 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 7/102:48 pm
BUF
- ORD
1 stop6h 05m
Frontier
Fri 7/175:13 pm
ORD
- BUF
1 stop26h 54m
Frontier
Deal found 6/11![Frontier logo]()
$260
This Trip.com deal was found by Cheapflights users on 6/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/152:48 pm
BUF
- MDW
1 stop8h 15m
Frontier
Mon 7/206:05 am
MDW
- BUF
1 stop6h 48m
Frontier
Deal found 6/12![Frontier logo]()
$257
This American Airlines deal was found by Cheapflights users on 6/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/1510:07 am
BUF
- ORD
Nonstop2h 02m
American Airlines
Tue 7/216:46 am
ORD
- BUF
Nonstop1h 51m
American Airlines
Deal found 6/13![American Airlines logo]()
$257
This Kiwi.com deal was found by Cheapflights users on 6/14. 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.
Tue 7/2111:29 am
BUF
- STL
1 stop7h 08m
Frontier
Thu 7/236:34 pm
STL
- BUF
1 stop18h 19m
Frontier
Deal found 6/14![Frontier logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 7/222:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Tue 8/116:34 pm
STL
- BUF
1 stop18h 19m
Frontier
Deal found 6/14![Frontier logo]()
$191
This Trip.com deal was found by Cheapflights users on 6/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/272:48 pm
BUF
- MDW
1 stop8h 15m
Frontier
Fri 7/316:05 am
MDW
- BUF
1 stop6h 48m
Frontier
Deal found 6/12![Frontier logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 6/14. 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 7/292:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Sun 8/26:34 pm
STL
- BUF
1 stop18h 19m
Frontier
Deal found 6/14![Frontier logo]()
$186
This Frontier deal was found by Cheapflights users on 6/15. 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.
Wed 7/292:48 pm
BUF
- MDW
1 stop8h 15m
Frontier
Mon 8/36:05 am
MDW
- BUF
1 stop6h 48m
Frontier
Deal found 6/15![Frontier logo]()
$260
One-way flights from Buffalo to IllinoisSearch for one-way flight options from Buffalo to Illinois. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
Search for one-way flight options from Buffalo to Illinois. Find affordable one-way fares based on user searches. Data last updated June 16, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 6/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/113:52 pm
BUF
- ORD
1 stop7h 03m
JetBlue
Deal found 6/13![JetBlue logo]()
$84
This JetBlue deal was found by Cheapflights users on 6/12. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/83:52 pm
BUF
- ORD
1 stop7h 03m
JetBlue
Deal found 6/12![JetBlue logo]()
$85
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/43:55 pm
BUF
- ORD
1 stop7h 03m
JetBlue
Deal found 6/15![JetBlue logo]()
$89
This JetBlue deal was found by Cheapflights users on 6/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/129:15 am
BUF
- ORD
1 stop9h 05m
JetBlue
Deal found 6/14![JetBlue logo]()
$90
This Trip.com deal was found by Cheapflights users on 6/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1811:35 am
BUF
- STL
1 stop6h 55m
Frontier
Deal found 6/15![Frontier logo]()
$93
This JetBlue deal was found by Cheapflights users on 6/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/143:32 pm
BUF
- ORD
1 stop7h 23m
JetBlue
Deal found 6/14![JetBlue logo]()
$93
This Trip.com deal was found by Cheapflights users on 6/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/911:29 am
BUF
- STL
1 stop22h 28m
Frontier
Deal found 6/15![Frontier logo]()
$94
This JetBlue deal was found by Cheapflights users on 6/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/86:00 am
BUF
- ORD
1 stop5h 06m
JetBlue
Deal found 6/14![JetBlue logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 6/13. 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.
Tue 7/2811:29 am
BUF
- STL
1 stop22h 28m
Frontier
Deal found 6/13![Frontier logo]()
$99
This Cheapflightsfares deal was found by Cheapflights users on 6/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/254:01 pm
BUF
- ORD
1 stop6h 57m
JetBlue
Deal found 6/12![JetBlue logo]()
$100
This JetBlue deal was found by Cheapflights users on 6/11. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/143:30 pm
BUF
- ORD
1 stop7h 36m
JetBlue
Deal found 6/11![JetBlue logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 6/13. 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.
Sat 9/121:16 pm
BUF
- STL
1 stop21h 24m
Frontier
Deal found 6/13![Frontier logo]()
$102
Find flight deals from Buffalo to Illinois
Keep the following information in mind while searching for Buffalo to Illinois flight deals. Data was last updated June 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $186 (Kiwi.com) |
One-way from | $84 (Cheapflightsfares) |
Popular in | March |
Cheapest in | September |
Average price | $349 |
Good round-trip deal | $392 or less |
Good one-way deal | $203 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Buffalo 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 June 16, 2026.
Use the filters below to find and compare flights from Buffalo to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Fri 8/7
6:04 pm-7:03 pm
Nonstop1h 59m
Chicago O'Hare Intl
Tue 8/11
2:07 pm-4:56 pm
Nonstop1h 49m
$285
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Fri 12/11
3:50 pm-6:37 pm
1 stop3h 47m
Chicago Midway
Tue 12/15
9:30 am-3:11 pm
1 stop4h 41m
$289
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Tue 9/1
2:26 pm-3:30 pm
Nonstop2h 04m
Chicago O'Hare Intl
Wed 9/2
6:49 am-9:28 am
Nonstop1h 39m
$291
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Thu 7/16
6:04 pm-7:03 pm
Nonstop1h 59m
Chicago O'Hare Intl
Tue 7/21
1:55 pm-4:41 pm
Nonstop1h 46m
$301
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Fri 8/28
7:10 pm-7:45 pm
Nonstop1h 35m
Chicago Midway
Tue 9/1
8:40 am-11:20 am
Nonstop1h 40m
$303
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Fri 8/28
5:58 pm-7:00 pm
Nonstop2h 02m
Chicago O'Hare Intl
Tue 9/1
2:07 pm-4:56 pm
Nonstop1h 49m
$303
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Sat 8/1
5:25 pm-10:30 pm
1 stop6h 05m
Chicago Midway
Wed 8/5
8:40 am-11:20 am
Nonstop1h 40m
$313
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Sat 8/1
6:29 am-9:13 am
1 stop3h 44m
Chicago Midway
Tue 8/4
6:42 pm-11:58 pm
1 stop4h 16m
$323
BuffaloMoline
BUF - MLI
BUFMLI
Buffalo
Fri 7/3
6:27 am-11:13 am
1 stop5h 46m
Moline Quad-City
Mon 7/6
6:50 pm-11:59 pm
1 stop4h 09m
$324
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Thu 8/6
12:30 pm-7:30 pm
2 stops8h 00m
Chicago Midway
Mon 8/10
3:15 pm-10:15 pm
1 stop6h 00m
$324
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Buffalo to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Buffalo with our price prediction graph.
BUF-ORD
BUF-STL
BUF-MDW
BUF-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 Buffalo to Illinois
BUF-USIL
BUF-ORD
BUF-STL
BUF-MDW
BUF-MLI
What is the cheapest month to book a flight from Buffalo to Illinois?
Currently, March is the cheapest month in which you can book a flight from Buffalo to Illinois (average of $73). Flying from Buffalo to Illinois in April is currently the most expensive (average of $200). 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 BUF to IL?
Find hourly flight availability from Buffalo 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 June 16, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 27% on flights from Buffalo to Illinois by exploring options for tickets in the afternoon.
Weekly flight availability from Buffalo to Illinois
Explore weekly flight availability from Buffalo 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 June 16, 2026.
The most flights from BUF to USIL are scheduled on a Monday (35 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (26 on average).
How much does it cost to fly round-trip from Buffalo to Illinois?
How far ahead should I book a flight from Buffalo to Illinois?
The best time to book flights from Buffalo to Illinois is 57 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 Buffalo to Illinois?
Use this chart to determine the cheapest time to fly round-trip from Buffalo to Illinois. Price data was last updated on June 13, 2026.
Travelers seeking maximum savings on their Buffalo to Illinois flight should consider departing on Tuesday evenings when fares are most often at their lowest. Thursday at noon 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 June 16, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andAmerican Airlines from Buffalo to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Entertainment
7.5
Overall
7.9
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Overall
7.9
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Overall
7.9
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Overall
7.9
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Overall
7.9
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Boarding
8.1
Entertainment
7.5
Overall
7.9
Comfort
8.0
Food
7.0
Crew
8.6
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from Buffalo 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 Buffalo to Illinois
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Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Buffalo to Illinois by cabin class
Find flights from Buffalo to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Buffalo and Illinois flights
Browse other Buffalo and Illinois flight options. Last updated on June 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Buffalo to Illinois flights
Consider these flights traveling from Buffalo to Illinois.
Top 4 airlines flying from Buffalo to Illinois
Discover the top 4 airlines that operate flights from Buffalo 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 June 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$92 | Average$202 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$145 | Average$330 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$232 | Average$347 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$237 | Average$389 | FlexibilityNo cancel fee | On-time63% |