$79+ 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Aug 29 — Sep 51
Round-trip
1 adult, Economy
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Find cheap flights from Buffalo to Illinois with Cheapflights
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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 July 30, 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 July 30, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:20 pm
BUF
- STL
1 stop23h 02m
Frontier
Thu 9/36:17 pm
STL
- BUF
1 stop15h 12m
Frontier
Deal found 7/27![Frontier logo]()
$159
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/91:13 pm
BUF
- STL
1 stop21h 27m
Frontier
Thu 10/1510:35 am
STL
- BUF
1 stop24h 43m
Frontier
Deal found 7/27![Frontier logo]()
$165
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:36 am
BUF
- STL
1 stop6h 46m
Frontier
Fri 8/216:17 pm
STL
- BUF
1 stop15h 12m
Frontier
Deal found 7/27![Frontier logo]()
$176
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:36 am
BUF
- STL
1 stop6h 46m
Frontier
Sat 8/296:45 pm
STL
- BUF
2 stops14h 44m
Frontier
Deal found 7/28![Frontier logo]()
$239
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1512:28 pm
BUF
- ORD
1 stop8h 25m
Frontier
Tue 8/181:59 pm
ORD
- BUF
1 stop19h 30m
Frontier
Deal found 7/28![Frontier logo]()
$241
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 9/311:45 am
BUF
- MDW
Nonstop1h 35m
Southwest
Sun 9/69:25 am
MDW
- BUF
Nonstop1h 30m
Southwest
Deal found 7/29![Southwest logo]()
$242
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 9/56:55 am
BUF
- ORD
Nonstop2h 00m
United Airlines
Sun 9/610:25 am
ORD
- BUF
Nonstop1h 51m
United Airlines
Deal found 7/28![United Airlines logo]()
$242
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.
Wed 9/3012:35 pm
BUF
- MDW
Nonstop1h 35m
Southwest
Thu 10/17:25 am
MDW
- BUF
1 stop3h 35m
Southwest
Deal found 7/28![Southwest logo]()
$243
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:49 pm
BUF
- ORD
1 stop11h 10m
Multiple Airlines
Tue 9/2910:59 am
ORD
- BUF
1 stop6h 34m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$243
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:40 pm
BUF
- ORD
1 stop5h 43m
Multiple Airlines
Sun 9/207:00 am
ORD
- BUF
1 stop7h 37m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$244
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/511:36 am
BUF
- ORD
1 stop9h 32m
Frontier
Sun 9/61:59 pm
ORD
- BUF
1 stop19h 30m
Frontier
Deal found 7/28![Frontier logo]()
$245
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/101:13 pm
BUF
- STL
2 stops31h 26m
Frontier
Thu 10/1510:35 am
STL
- BUF
1 stop24h 43m
Frontier
Deal found 7/27![Frontier logo]()
$246
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 July 30, 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 July 30, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/101:13 pm
BUF
- STL
2 stops31h 26m
Frontier
Thu 10/1510:35 am
STL
- BUF
1 stop24h 43m
Frontier
Deal found 7/27![Frontier logo]()
$246
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 9/195:30 am
BUF
- ORD
1 stop4h 38m
American Airlines
Sat 9/197:20 pm
ORD
- BUF
Nonstop1h 50m
American Airlines
Deal found 7/29![American Airlines logo]()
$247
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.
Sat 9/197:50 am
BUF
- MDW
Nonstop1h 35m
Southwest
Sat 9/199:55 am
MDW
- BUF
2 stops10h 15m
Southwest
Deal found 7/29![Southwest logo]()
$252
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3012:02 pm
BUF
- ORD
1 stop5h 11m
Delta
Thu 10/11:55 pm
ORD
- BUF
1 stop4h 09m
Delta
Deal found 7/28![Delta logo]()
$257
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 9/2110:30 am
BUF
- ORD
Nonstop1h 59m
United Airlines
Fri 9/256:56 pm
ORD
- BUF
Nonstop1h 47m
United Airlines
Deal found 7/29![United Airlines logo]()
$288
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/104:31 pm
BUF
- ORD
1 stop6h 27m
JetBlue
Thu 9/1710:59 am
ORD
- BUF
1 stop6h 59m
JetBlue
Deal found 7/28![JetBlue logo]()
$296
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/196:00 am
BUF
- MDW
2 stops7h 05m
Southwest
Mon 8/248:05 am
MDW
- BUF
Nonstop1h 40m
Southwest
Deal found 7/25![Southwest logo]()
$252
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:20 am
BUF
- ORD
1 stop5h 17m
Delta
Sat 9/196:00 pm
ORD
- BUF
1 stop3h 35m
Delta
Deal found 7/29![Delta logo]()
$257
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 9/2412:49 pm
BUF
- STL
1 stop28h 45m
Frontier
Mon 9/285:19 pm
STL
- BUF
1 stop23h 30m
Frontier
Deal found 7/28![Frontier logo]()
$258
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 9/107:10 pm
BUF
- MDW
Nonstop1h 35m
Southwest
Mon 9/216:20 pm
MDW
- BUF
Nonstop1h 35m
Southwest
Deal found 7/28![Southwest logo]()
$258
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3011:36 am
BUF
- ORD
1 stop21h 17m
Frontier
Sat 9/51:59 pm
ORD
- BUF
1 stop19h 30m
Frontier
Deal found 7/29![Frontier logo]()
$259
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.
Tue 9/15:58 pm
BUF
- ORD
Nonstop2h 02m
United Airlines
Wed 9/26:49 am
ORD
- BUF
Nonstop1h 39m
United Airlines
Deal found 7/27![United Airlines logo]()
$306
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 8/176:00 am
BUF
- MDW
2 stops7h 25m
Southwest
Wed 8/196:30 am
MDW
- BUF
1 stop6h 50m
Southwest
Deal found 7/27![Southwest logo]()
$262
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:10 am
BUF
- MDW
1 stop4h 07m
Delta
Thu 10/86:44 pm
MDW
- BUF
1 stop4h 15m
Delta
Deal found 7/27![Delta logo]()
$308
This United Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 8/1510:30 am
BUF
- ORD
Nonstop1h 59m
United Airlines
Mon 8/176:49 am
ORD
- BUF
Nonstop1h 39m
United Airlines
Deal found 7/25![United Airlines logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/151:13 pm
BUF
- STL
1 stop21h 27m
Frontier
Sun 10/188:10 pm
STL
- BUF
2 stops15h 08m
Frontier
Deal found 7/25![Frontier logo]()
$284
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 8/206:30 am
BUF
- MDW
2 stops9h 00m
Southwest
Mon 8/243:15 pm
MDW
- BUF
1 stop6h 00m
Southwest
Deal found 7/26![Southwest logo]()
$262
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 9/43:54 pm
BUF
- ORD
1 stop3h 35m
Delta
Mon 9/77:30 pm
ORD
- BUF
1 stop3h 28m
Delta
Deal found 7/26![Delta logo]()
$308
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.
Thu 8/2010:30 am
BUF
- ORD
Nonstop1h 59m
United Airlines
Mon 8/246:49 am
ORD
- BUF
Nonstop1h 39m
United Airlines
Deal found 7/27![United Airlines logo]()
$308
This Trip.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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.
Sun 8/169:33 pm
BUF
- ORD
1 stop12h 38m
Frontier
Sun 8/237:44 pm
ORD
- BUF
1 stop21h 25m
Frontier
Deal found 7/26![Frontier logo]()
$300
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:05 am
BUF
- MLI
1 stop5h 20m
Delta
Tue 9/15:09 pm
MLI
- BUF
1 stop5h 50m
Delta
Deal found 7/28![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 9/183:55 pm
BUF
- MDW
1 stop6h 05m
Southwest
Tue 9/228:40 am
MDW
- BUF
Nonstop1h 40m
Southwest
Deal found 7/25![Southwest logo]()
$298
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 9/136:55 am
BUF
- STL
1 stop4h 17m
United Airlines
Wed 9/1612:59 pm
STL
- BUF
1 stop7h 08m
United Airlines
Deal found 7/26![United Airlines logo]()
$353
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/103:53 pm
BUF
- STL
1 stop5h 42m
Delta
Sat 9/126:40 am
STL
- BUF
1 stop3h 42m
Delta
Deal found 7/27![Delta logo]()
$327
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.
Fri 12/42:00 pm
BUF
- MDW
Nonstop1h 45m
Southwest
Mon 12/78:10 am
MDW
- BUF
2 stops7h 10m
Southwest
Deal found 7/27![Southwest logo]()
$303
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/43:54 pm
BUF
- MDW
1 stop3h 39m
Delta
Mon 9/76:42 pm
MDW
- BUF
1 stop4h 16m
Delta
Deal found 7/27![Delta logo]()
$339
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.
Fri 9/117:10 pm
BUF
- STL
1 stop4h 00m
Southwest
Sat 9/121:40 pm
STL
- BUF
2 stops6h 30m
Southwest
Deal found 7/27![Southwest logo]()
$316
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 10/87:00 am
BUF
- MLI
1 stop6h 37m
United Airlines
Sun 10/112:28 pm
MLI
- BUF
1 stop5h 19m
United Airlines
Deal found 7/26![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” 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 9/185:59 pm
STL
- BUF
1 stop4h 54m
Delta
Deal found 7/25![Delta logo]()
$348
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 10/112:35 pm
BUF
- STL
2 stops7h 30m
Southwest
Tue 10/62:20 pm
STL
- BUF
2 stops7h 00m
Southwest
Deal found 7/29![Southwest logo]()
$319
Last-minute flights from Buffalo to IllinoisDiscover last-minute flight deals from Buffalo to Illinois. Data last updated July 30, 2026 and is based on user searches.
Discover last-minute flight deals from Buffalo to Illinois. Data last updated July 30, 2026 and is based on user searches.
This JetBlue 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:00 am
BUF
- ORD
1 stop5h 11m
JetBlue
Sat 8/151:55 pm
ORD
- BUF
1 stop8h 48m
JetBlue
Deal found 7/27![JetBlue logo]()
$249
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1512:28 pm
BUF
- ORD
1 stop8h 25m
Frontier
Tue 8/181:59 pm
ORD
- BUF
1 stop19h 30m
Frontier
Deal found 7/28![Frontier logo]()
$241
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.
Mon 8/176:00 am
BUF
- ORD
1 stop5h 30m
American Airlines
Wed 8/192:19 pm
ORD
- BUF
Nonstop1h 45m
American Airlines
Deal found 7/27![American Airlines logo]()
$252
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:57 am
BUF
- MDW
1 stop4h 42m
Delta
Mon 8/246:42 pm
MDW
- BUF
1 stop4h 16m
Delta
Deal found 7/28![Delta logo]()
$257
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:36 am
BUF
- STL
1 stop6h 46m
Frontier
Fri 8/216:17 pm
STL
- BUF
1 stop15h 12m
Frontier
Deal found 7/27![Frontier logo]()
$176
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:36 am
BUF
- STL
1 stop6h 46m
Frontier
Sat 8/296:45 pm
STL
- BUF
2 stops14h 44m
Frontier
Deal found 7/28![Frontier logo]()
$239
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:36 am
BUF
- ORD
1 stop9h 23m
Frontier
Mon 8/249:10 pm
ORD
- BUF
1 stop11h 13m
Frontier
Deal found 7/28![Frontier logo]()
$242
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 8/205:00 am
BUF
- ORD
1 stop7h 38m
American Airlines
Tue 8/259:10 pm
ORD
- BUF
Nonstop1h 52m
American Airlines
Deal found 7/29![American Airlines logo]()
$247
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.
Thu 8/206:09 pm
BUF
- ORD
Nonstop2h 18m
American Airlines
Mon 8/245:00 am
ORD
- BUF
1 stop4h 18m
American Airlines
Deal found 7/30![American Airlines logo]()
$248
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 8/2612:35 pm
BUF
- MDW
Nonstop1h 35m
Southwest
Wed 9/29:25 am
MDW
- BUF
1 stop3h 55m
Southwest
Deal found 7/29![Southwest logo]()
$247
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:20 pm
BUF
- STL
1 stop23h 02m
Frontier
Thu 9/36:17 pm
STL
- BUF
1 stop15h 12m
Frontier
Deal found 7/27![Frontier logo]()
$159
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:36 am
BUF
- ORD
1 stop9h 32m
Frontier
Sun 8/307:44 pm
ORD
- BUF
1 stop21h 25m
Frontier
Deal found 7/27![Frontier logo]()
$250
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 July 30, 2026.
Search for one-way flight options from Buffalo to Illinois. Find affordable one-way fares based on user searches. Data last updated July 30, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2411:36 am
BUF
- STL
1 stop6h 46m
Frontier
Deal found 7/28![Frontier logo]()
$79
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/261:45 pm
BUF
- MDW
1 stop5h 06m
Frontier
Deal found 7/30![Frontier logo]()
$79
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/261:13 pm
BUF
- ORD
1 stop8h 15m
Frontier
Deal found 7/30![Frontier logo]()
$79
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/3111:36 am
BUF
- STL
1 stop6h 46m
Frontier
Deal found 7/27![Frontier logo]()
$80
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2611:36 am
BUF
- MDW
1 stop12h 11m
Frontier
Deal found 7/30![Frontier logo]()
$85
This Frontier deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 9/231:40 pm
BUF
- MDW
1 stop5h 11m
Frontier
Deal found 7/26![Frontier logo]()
$100
This Frontier deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/261:45 pm
BUF
- ORD
1 stop5h 38m
Frontier
Deal found 7/26![Frontier logo]()
$100
This Flightnetwork 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/191:40 pm
BUF
- MDW
1 stop5h 11m
Frontier
Deal found 7/29![Frontier logo]()
$101
This Flightnetwork 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/191:40 pm
BUF
- ORD
1 stop5h 43m
Frontier
Deal found 7/29![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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 8/2111:36 am
BUF
- STL
1 stop6h 46m
Frontier
Deal found 7/26![Frontier logo]()
$102
This Super.com deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” 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.
Tue 8/2511:36 am
BUF
- MDW
1 stop12h 11m
Frontier
Deal found 7/26![Frontier logo]()
$105
This Super.com 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1911:36 am
BUF
- ORD
1 stop9h 32m
Frontier
Deal found 7/28![Frontier logo]()
$105
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 July 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $159 (Kiwi.com) |
One-way from | $79 (Kiwi.com) |
Popular in | March |
Cheapest in | September |
Average price | $389 |
Good round-trip deal | $356 or less |
Good one-way deal | $204 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 July 30, 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
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Sat 10/10
1:13 pm-7:39 pm
2 stops31h 26m
Lambert-St Louis
Thu 10/15
10:35 am-12:18 pm
1 stop24h 43m
$246
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Sat 9/19
5:30 am-9:08 am
1 stop4h 38m
Chicago O'Hare Intl
Sat 9/19
7:20 pm-10:10 pm
Nonstop1h 50m
$247
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Sat 9/19
7:50 am-8:25 am
Nonstop1h 35m
Chicago Midway
Sat 9/19
9:55 am-9:10 pm
2 stops10h 15m
$252
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Wed 8/19
6:00 am-12:05 pm
2 stops7h 05m
Chicago Midway
Mon 8/24
8:05 am-10:45 am
Nonstop1h 40m
$252
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Wed 9/30
12:02 pm-4:13 pm
1 stop5h 11m
Chicago O'Hare Intl
Thu 10/1
1:55 pm-7:04 pm
1 stop4h 09m
$257
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Sat 9/19
6:20 am-10:37 am
1 stop5h 17m
Chicago O'Hare Intl
Sat 9/19
6:00 pm-10:35 pm
1 stop3h 35m
$257
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Thu 9/24
12:49 pm-4:34 pm
1 stop28h 45m
Lambert-St Louis
Mon 9/28
5:19 pm-5:49 pm
1 stop23h 30m
$258
Quickest round-trip
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Thu 9/10
7:10 pm-7:45 pm
Nonstop1h 35m
Chicago Midway
Mon 9/21
6:20 pm-8:55 pm
Nonstop1h 35m
$258
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Sun 8/30
11:36 am-7:53 am
1 stop21h 17m
Chicago O'Hare Intl
Sat 9/5
1:59 pm-10:29 am
1 stop19h 30m
$259
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Mon 8/17
6:00 am-12:25 pm
2 stops7h 25m
Chicago Midway
Wed 8/19
6:30 am-2:20 pm
1 stop6h 50m
$262
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-STL
BUF-MDW
BUF-ORD
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-STL
BUF-MDW
BUF-ORD
BUF-MLI
What is the cheapest month to book a flight from Buffalo to Illinois?
Currently, January is the cheapest month in which you can book a flight from Buffalo to Illinois (average of $278). Flying from Buffalo to Illinois in March is currently the most expensive (average of $436). 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 July 30, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 24% 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 July 30, 2026.
The most flights from BUF to USIL are scheduled on a Monday (36 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 on average).
How much does it cost to fly round-trip from Buffalo to Illinois?
Airfare is below average for this route at the moment.
Buffalo to Illinois flights typically cost between $248 and $531 in August.The cheapest round-trip price found within the last 5 days was $241 on Frontier (Aug 15-Aug 18).
How far ahead should I book a flight from Buffalo to Illinois?
The best time to book flights from Buffalo to Illinois is 34 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 July 25, 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 July 30, 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.
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
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 July 30, 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 July 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$92 | Average$202 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$145 | Average$345 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$232 | Average$354 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$237 | Average$369 | FlexibilityNo cancel fee | On-time63% |