$70+ 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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Jul 9 — Jul 161
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 June 9, 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 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 7/82:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Wed 7/154:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/8![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/172:48 pm
BUF
- STL
1 stop19h 09m
Frontier
Wed 7/224:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/7![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/32:50 pm
BUF
- STL
1 stop19h 02m
Frontier
Mon 7/64:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/6![Frontier logo]()
$199
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/172:48 pm
BUF
- STL
1 stop19h 09m
Frontier
Mon 7/204:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/7![Frontier logo]()
$203
This Kiwi.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 7/911:29 am
BUF
- STL
1 stop7h 08m
Frontier
Fri 7/104:57 pm
STL
- BUF
1 stop17h 36m
Frontier
Deal found 6/9![Frontier logo]()
$209
This Kiwi.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/272:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Fri 7/314:57 pm
STL
- BUF
1 stop17h 36m
Frontier
Deal found 6/5![Frontier logo]()
$221
This Frontier deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/242:48 pm
BUF
- MDW
1 stop8h 15m
Frontier
Mon 7/276:05 am
MDW
- BUF
1 stop6h 48m
Frontier
Deal found 6/6![Frontier logo]()
$250
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/3011:29 am
BUF
- ORD
1 stop9h 24m
Frontier
Mon 8/37:05 am
ORD
- BUF
1 stop5h 48m
Frontier
Deal found 6/7![Frontier logo]()
$250
This Cheapflightsfares deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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
Mon 7/66:00 am
ORD
- BUF
1 stop7h 37m
JetBlue
Deal found 6/5![JetBlue logo]()
$251
This Cheapflightsfares deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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.
Mon 7/69:17 am
BUF
- ORD
1 stop7h 59m
JetBlue
Sun 7/126:00 am
ORD
- BUF
1 stop7h 59m
JetBlue
Deal found 6/5![JetBlue logo]()
$252
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/227:10 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Tue 7/286:55 pm
MDW
- BUF
Nonstop1h 35m
Southwest
Deal found 6/5![Southwest logo]()
$253
This American Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/34:45 pm
BUF
- ORD
Nonstop2h 15m
American Airlines
Tue 7/76:46 am
ORD
- BUF
Nonstop1h 51m
American Airlines
Deal found 6/4![American Airlines logo]()
$253
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 9, 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 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 7/82:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Wed 7/154:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/8![Frontier logo]()
$187
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 9/110:30 am
BUF
- ORD
Nonstop1h 59m
United Airlines
Wed 9/26:15 pm
ORD
- BUF
Nonstop1h 52m
United Airlines
Deal found 6/8![United Airlines logo]()
$290
This Southwest deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/55:45 pm
BUF
- STL
1 stop6h 25m
Southwest
Thu 10/81:50 pm
STL
- BUF
1 stop8h 25m
Southwest
Deal found 6/9![Southwest logo]()
$303
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 8/13:54 pm
BUF
- ORD
1 stop5h 37m
Delta
Tue 8/47:00 am
ORD
- BUF
1 stop3h 22m
Delta
Deal found 6/8![Delta logo]()
$305
This KAYAK deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/124:02 pm
BUF
- ORD
1 stop6h 56m
JetBlue
Wed 7/156:00 am
ORD
- BUF
1 stop7h 59m
JetBlue
Deal found 6/5![JetBlue logo]()
$307
This American Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 6/196:00 am
BUF
- MLI
1 stop5h 41m
American Airlines
Tue 6/236:52 pm
MLI
- BUF
1 stop4h 46m
American Airlines
Deal found 6/4![American Airlines logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 6/5![Frontier logo]()
$264
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 6/8![United Airlines logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/211:35 am
BUF
- STL
1 stop6h 55m
Frontier
Thu 7/96:34 pm
STL
- BUF
1 stop18h 19m
Frontier
Deal found 6/4![Frontier logo]()
$269
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 8/147:10 pm
BUF
- MDW
Nonstop1h 35m
Southwest
Mon 8/178:05 am
MDW
- BUF
Nonstop1h 40m
Southwest
Deal found 6/5![Southwest logo]()
$309
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 7/135:05 pm
MLI
- BUF
1 stop5h 54m
Delta
Deal found 6/8![Delta logo]()
$324
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 9/257:10 pm
BUF
- MDW
Nonstop1h 35m
Southwest
Mon 9/282:35 pm
MDW
- BUF
2 stops6h 15m
Southwest
Deal found 6/8![Southwest logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/2910:57 am
BUF
- MLI
1 stop3h 59m
United Airlines
Tue 8/41:14 pm
MLI
- BUF
2 stops9h 45m
United Airlines
Deal found 6/6![United Airlines logo]()
$324
This Delta deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/13:54 pm
BUF
- ORD
1 stop5h 37m
Delta
Thu 8/135:20 pm
ORD
- BUF
1 stop5h 38m
Delta
Deal found 6/4![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Sun 8/210:55 am
BUF
- MDW
1 stop6h 10m
Southwest
Tue 8/48:40 am
MDW
- BUF
Nonstop1h 40m
Southwest
Deal found 6/7![Southwest logo]()
$315
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 8/255:58 pm
BUF
- STL
1 stop5h 02m
United Airlines
Wed 8/269:30 am
STL
- BUF
1 stop6h 26m
United Airlines
Deal found 6/8![United Airlines logo]()
$328
This Delta deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 9/159:00 am
BUF
- STL
1 stop5h 06m
Delta
Fri 9/185:57 pm
STL
- BUF
1 stop4h 57m
Delta
Deal found 6/6![Delta logo]()
$336
This American Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 6/264:12 pm
BUF
- MLI
2 stops8h 59m
American Airlines
Mon 6/296:00 am
MLI
- BUF
2 stops9h 25m
American Airlines
Deal found 6/7![American Airlines logo]()
$418
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/106:05 am
BUF
- MDW
2 stops8h 40m
Southwest
Wed 7/155:30 pm
MDW
- BUF
1 stop4h 15m
Southwest
Deal found 6/4![Southwest logo]()
$326
This United Airlines deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 8/296:55 am
BUF
- ORD
Nonstop2h 00m
United Airlines
Sun 8/306:19 pm
ORD
- BUF
Nonstop1h 52m
United Airlines
Deal found 6/5![United Airlines logo]()
$329
This Delta deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/136:27 am
BUF
- MDW
1 stop3h 50m
Delta
Sun 8/166:42 pm
MDW
- BUF
1 stop4h 16m
Delta
Deal found 6/4![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/2910:57 am
BUF
- ORD
Nonstop2h 00m
United Airlines
Thu 8/132:07 pm
ORD
- BUF
Nonstop1h 49m
United Airlines
Deal found 6/4![United Airlines logo]()
$331
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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
- MDW
Nonstop1h 35m
Southwest
Mon 9/148:05 am
MDW
- BUF
Nonstop1h 40m
Southwest
Deal found 6/8![Southwest logo]()
$333
This United Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/410:57 am
BUF
- ORD
Nonstop1h 57m
United Airlines
Sun 7/57:15 am
ORD
- BUF
Nonstop1h 45m
United Airlines
Deal found 6/6![United Airlines logo]()
$336
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 8/283:55 pm
BUF
- MDW
2 stops7h 25m
Southwest
Mon 8/312:35 pm
MDW
- BUF
2 stops6h 15m
Southwest
Deal found 6/5![Southwest logo]()
$339
This Delta deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/47:00 am
BUF
- MLI
2 stops14h 09m
Delta
Sat 7/115:10 pm
MLI
- BUF
1 stop5h 32m
Delta
Deal found 6/5![Delta logo]()
$393
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/217:10 pm
BUF
- STL
1 stop4h 20m
Southwest
Thu 7/234:35 pm
STL
- BUF
2 stops6h 40m
Southwest
Deal found 6/5![Southwest logo]()
$346
This United Airlines deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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
Sun 8/306:19 pm
ORD
- BUF
Nonstop1h 52m
United Airlines
Deal found 6/5![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 8/1912:02 pm
BUF
- MLI
2 stops11h 26m
Delta
Sun 8/235:09 pm
MLI
- BUF
1 stop5h 50m
Delta
Deal found 6/5![Delta logo]()
$413
This Southwest deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/47:15 am
BUF
- MDW
1 stop4h 25m
Southwest
Sat 7/43:35 pm
MDW
- BUF
Nonstop1h 30m
Southwest
Deal found 6/6![Southwest logo]()
$346
Last-minute flights from Buffalo to IllinoisDiscover last-minute flight deals from Buffalo to Illinois. Data last updated June 9, 2026 and is based on user searches.
Discover last-minute flight deals from Buffalo to Illinois. Data last updated June 9, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/32:50 pm
BUF
- STL
1 stop19h 02m
Frontier
Mon 7/64:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/6![Frontier logo]()
$199
This Cheapflightsfares deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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
Mon 7/66:00 am
ORD
- BUF
1 stop7h 37m
JetBlue
Deal found 6/5![JetBlue logo]()
$251
This American Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” 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 7/34:45 pm
BUF
- ORD
Nonstop2h 15m
American Airlines
Sat 7/47:59 pm
ORD
- BUF
Nonstop1h 48m
American Airlines
Deal found 6/6![American Airlines logo]()
$253
This Cheapflightsfares deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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.
Mon 7/69:17 am
BUF
- ORD
1 stop7h 59m
JetBlue
Sun 7/126:00 am
ORD
- BUF
1 stop7h 59m
JetBlue
Deal found 6/5![JetBlue logo]()
$252
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 7/82:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Wed 7/154:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/8![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 7/911:29 am
BUF
- STL
1 stop7h 08m
Frontier
Fri 7/104:57 pm
STL
- BUF
1 stop17h 36m
Frontier
Deal found 6/9![Frontier logo]()
$209
This Expedia deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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.
Thu 7/911:29 am
BUF
- ORD
1 stop9h 24m
Frontier
Mon 7/137:05 am
ORD
- BUF
1 stop5h 48m
Frontier
Deal found 6/4![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/172:48 pm
BUF
- STL
1 stop19h 09m
Frontier
Wed 7/224:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/7![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/172:48 pm
BUF
- STL
1 stop19h 09m
Frontier
Mon 7/204:57 pm
STL
- BUF
1 stop16h 32m
Frontier
Deal found 6/7![Frontier logo]()
$203
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/227:10 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Tue 7/286:55 pm
MDW
- BUF
Nonstop1h 35m
Southwest
Deal found 6/5![Southwest logo]()
$253
This Frontier deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/242:48 pm
BUF
- MDW
1 stop8h 15m
Frontier
Mon 7/276:05 am
MDW
- BUF
1 stop6h 48m
Frontier
Deal found 6/6![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” 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 7/272:48 pm
BUF
- STL
1 stop27h 49m
Frontier
Fri 7/314:57 pm
STL
- BUF
1 stop17h 36m
Frontier
Deal found 6/5![Frontier logo]()
$221
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 9, 2026.
Search for one-way flight options from Buffalo to Illinois. Find affordable one-way fares based on user searches. Data last updated June 9, 2026.
This Flysmarter deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/43:55 pm
BUF
- ORD
1 stop6h 35m
JetBlue
Deal found 6/8![JetBlue logo]()
$70
This Super.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 8/53:55 pm
BUF
- ORD
1 stop7h 03m
JetBlue
Deal found 6/9![JetBlue logo]()
$81
This Cheapflightsfares deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 9/13:52 pm
BUF
- ORD
1 stop7h 03m
JetBlue
Deal found 6/7![JetBlue logo]()
$83
This Cheapflightsfares deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 6/8![JetBlue logo]()
$84
This Super.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/249:15 am
BUF
- ORD
1 stop8h 01m
JetBlue
Deal found 6/5![JetBlue logo]()
$87
This Super.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” 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 7/146:00 am
BUF
- ORD
1 stop5h 06m
JetBlue
Deal found 6/9![JetBlue logo]()
$89
This Cheapflightsfares deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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.
Mon 8/33:32 pm
BUF
- ORD
1 stop7h 26m
JetBlue
Deal found 6/7![JetBlue logo]()
$92
This JetBlue deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/319:15 am
BUF
- ORD
1 stop8h 00m
JetBlue
Deal found 6/4![JetBlue logo]()
$93
This JetBlue deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” 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 7/76:00 am
BUF
- ORD
1 stop5h 06m
JetBlue
Deal found 6/8![JetBlue logo]()
$94
This Flysmarter deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/31:31 pm
BUF
- ORD
1 stop6h 54m
JetBlue
Deal found 6/8![JetBlue logo]()
$95
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” 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 7/189:15 am
BUF
- ORD
1 stop8h 01m
JetBlue
Deal found 6/7![JetBlue logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 8/2711:35 am
BUF
- STL
1 stop6h 55m
Frontier
Deal found 6/4![Frontier logo]()
$97
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 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $187 (Kiwi.com) |
One-way from | $70 (Flysmarter) |
Popular in | March |
Cheapest in | August |
Average price | $349 |
Good round-trip deal | $385 or less |
Good one-way deal | $208 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 9, 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
Wed 7/8
2:48 pm-5:37 pm
1 stop27h 49m
Lambert-St Louis
Wed 7/15
4:57 pm-10:29 am
1 stop16h 32m
$187
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Tue 7/21
11:29 am-5:37 pm
1 stop7h 08m
Lambert-St Louis
Thu 7/23
6:34 pm-1:53 pm
1 stop18h 19m
$264
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Thu 7/2
11:35 am-5:30 pm
1 stop6h 55m
Lambert-St Louis
Thu 7/9
6:34 pm-1:53 pm
1 stop18h 19m
$269
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Tue 9/1
10:30 am-11:29 am
Nonstop1h 59m
Chicago O'Hare Intl
Wed 9/2
6:15 pm-9:07 pm
Nonstop1h 52m
$290
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Tue 8/11
5:58 pm-7:00 pm
Nonstop2h 02m
Chicago O'Hare Intl
Wed 8/12
6:15 pm-9:07 pm
Nonstop1h 52m
$291
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Mon 10/5
5:45 pm-11:10 pm
1 stop6h 25m
Lambert-St Louis
Thu 10/8
1:50 pm-11:15 pm
1 stop8h 25m
$303
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Sat 8/1
3:54 pm-8:31 pm
1 stop5h 37m
Chicago O'Hare Intl
Tue 8/4
7:00 am-11:22 am
1 stop3h 22m
$305
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Sun 7/12
4:02 pm-9:58 pm
1 stop6h 56m
Chicago O'Hare Intl
Wed 7/15
6:00 am-2:59 pm
1 stop7h 59m
$307
Quickest round-trip
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Fri 8/14
7:10 pm-7:45 pm
Nonstop1h 35m
Chicago Midway
Mon 8/17
8:05 am-10:45 am
Nonstop1h 40m
$309
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Fri 9/25
7:10 pm-7:45 pm
Nonstop1h 35m
Chicago Midway
Mon 9/28
2:35 pm-9:50 pm
2 stops6h 15m
$309
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-ORD
BUF-MLI
BUF-MDW
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Buffalo to Illinois
BUF-USIL
BUF-STL
BUF-ORD
BUF-MLI
BUF-MDW
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 9, 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 9, 2026.
The most flights from BUF to USIL are scheduled on a Tuesday (36 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (25 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 8, 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 9, 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.
Overall
7.9
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
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 9, 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 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$92 | Average$200 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$145 | Average$323 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$188 | Average$339 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$237 | Average$369 | FlexibilityNo cancel fee | On-time63% |