$70+ Cheap flights from Illinois to Buffalo (BUF)
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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BUF
Jun 1 — Jun 81
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Buffalo with Cheapflights
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Cheapest flights from Illinois to BuffaloExplore the most affordable flight options available from Illinois to Buffalo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 2, 2026.
Explore the most affordable flight options available from Illinois to Buffalo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 2, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:31 pm
STL
- BUF
1 stop18h 24m
Frontier
Tue 6/1611:50 am
BUF
- STL
1 stop22h 02m
Frontier
Deal found 4/30![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Tue 5/266:33 pm
STL
- BUF
1 stop18h 21m
Frontier
Tue 6/211:36 am
BUF
- STL
1 stop6h 57m
Frontier
Deal found 4/29![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Tue 5/266:33 pm
STL
- BUF
1 stop18h 21m
Frontier
Thu 6/411:36 am
BUF
- STL
1 stop6h 57m
Frontier
Deal found 4/29![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Wed 6/32:49 pm
BUF
- MDW
1 stop8h 13m
Frontier
Deal found 4/30![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 5/261:50 pm
ORD
- BUF
1 stop23h 04m
Frontier
Tue 6/211:36 am
BUF
- ORD
1 stop9h 15m
Frontier
Deal found 4/28![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/275:27 pm
STL
- BUF
2 stops25h 37m
Frontier
Tue 6/211:36 am
BUF
- STL
1 stop6h 57m
Frontier
Deal found 4/29![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 4/28. 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.
Wed 5/136:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Wed 5/202:49 pm
BUF
- MDW
1 stop8h 13m
Frontier
Deal found 4/28![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 4/28. 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.
Wed 5/136:55 am
ORD
- BUF
1 stop5h 59m
Frontier
Tue 5/1911:36 am
BUF
- ORD
1 stop9h 15m
Frontier
Deal found 4/28![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/276:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Wed 6/32:49 pm
BUF
- MDW
1 stop8h 13m
Frontier
Deal found 4/29![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Sat 5/3012:41 pm
BUF
- MDW
1 stop10h 21m
Frontier
Deal found 4/30![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/275:27 pm
STL
- BUF
2 stops25h 37m
Frontier
Thu 6/411:36 am
BUF
- STL
1 stop6h 57m
Frontier
Deal found 4/29![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/276:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Sun 5/3111:36 am
BUF
- MDW
1 stop24h 33m
Frontier
Deal found 4/29![Frontier logo]()
$169
Best flights from Illinois to BuffaloDiscover carefully curated flight deals from Illinois to Buffalo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 2, 2026.
Discover carefully curated flight deals from Illinois to Buffalo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 2, 2026.
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Tue 5/262:00 pm
ORD
- BUF
Nonstop1h 46m
United Airlines
Tue 6/25:52 pm
BUF
- ORD
Nonstop1h 59m
United Airlines
Deal found 4/28![United Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/267:50 am
MDW
- BUF
Nonstop1h 30m
Southwest
Tue 6/21:10 pm
BUF
- MDW
1 stop4h 05m
Southwest
Deal found 4/28![Southwest logo]()
$247
This Delta deal was found by Cheapflights users on 4/27. 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.
Sat 5/231:44 pm
ORD
- BUF
1 stop4h 07m
Delta
Tue 5/2612:04 pm
BUF
- ORD
1 stop5h 25m
Delta
Deal found 4/27![Delta logo]()
$271
This American Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/16:43 pm
CMI
- BUF
1 stop4h 26m
American Airlines
Sun 6/76:00 am
BUF
- CMI
1 stop6h 03m
American Airlines
Deal found 5/2![American Airlines logo]()
$298
This Southwest deal was found by Cheapflights users on 4/27. 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.
Tue 5/197:50 am
MDW
- BUF
Nonstop1h 30m
Southwest
Thu 5/2111:25 am
BUF
- MDW
Nonstop1h 40m
Southwest
Deal found 4/27![Southwest logo]()
$251
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Sat 5/236:17 pm
ORD
- BUF
Nonstop1h 46m
United Airlines
Tue 5/265:57 pm
BUF
- ORD
Nonstop1h 59m
United Airlines
Deal found 4/27![United Airlines logo]()
$251
This Delta deal was found by Cheapflights users on 4/29. 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.
Tue 5/266:04 pm
STL
- BUF
1 stop4h 55m
Delta
Wed 6/36:04 am
BUF
- STL
1 stop7h 19m
Delta
Deal found 4/29![Delta logo]()
$277
This American Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/47:11 pm
PIA
- BUF
1 stop4h 27m
American Airlines
Sun 6/76:00 am
BUF
- PIA
1 stop4h 14m
American Airlines
Deal found 5/1![American Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 4/27. 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.
Sat 5/233:35 pm
MDW
- BUF
Nonstop1h 25m
Southwest
Tue 5/263:10 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Deal found 4/27![Southwest logo]()
$286
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/137:27 am
ORD
- BUF
Nonstop1h 48m
United Airlines
Wed 6/171:54 pm
BUF
- ORD
Nonstop2h 01m
United Airlines
Deal found 5/1![United Airlines logo]()
$293
This Delta deal was found by Cheapflights users on 4/29. 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.
Fri 5/296:04 pm
STL
- BUF
1 stop4h 55m
Delta
Wed 6/39:45 am
BUF
- STL
1 stop6h 55m
Delta
Deal found 4/29![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:55 pm
MDW
- BUF
Nonstop1h 30m
Southwest
Fri 6/127:55 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Deal found 5/1![Southwest logo]()
$293
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Fri 5/296:17 pm
ORD
- BUF
Nonstop1h 46m
United Airlines
Tue 6/25:52 pm
BUF
- ORD
Nonstop1h 59m
United Airlines
Deal found 4/29![United Airlines logo]()
$293
This American Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/186:52 pm
MLI
- BUF
1 stop4h 46m
American Airlines
Sun 6/216:00 am
BUF
- MLI
1 stop5h 41m
American Airlines
Deal found 5/1![American Airlines logo]()
$324
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:45 am
STL
- BUF
1 stop3h 55m
Delta
Tue 10/137:40 pm
BUF
- STL
1 stop4h 59m
Delta
Deal found 4/30![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/136:30 am
MDW
- BUF
1 stop7h 20m
Southwest
Wed 6/172:55 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Deal found 5/1![Southwest logo]()
$303
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/26:17 pm
ORD
- BUF
Nonstop1h 46m
United Airlines
Wed 6/37:00 am
BUF
- ORD
Nonstop1h 59m
United Airlines
Deal found 5/1![United Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/311:30 am
ORD
- BUF
1 stop6h 27m
Delta
Tue 9/82:30 pm
BUF
- ORD
1 stop7h 15m
Delta
Deal found 4/30![Delta logo]()
$313
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/182:31 pm
MLI
- BUF
1 stop5h 32m
United Airlines
Sun 6/217:00 am
BUF
- MLI
1 stop3h 59m
United Airlines
Deal found 4/28![United Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/232:15 pm
MDW
- BUF
2 stops8h 10m
Southwest
Mon 5/258:00 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Deal found 5/1![Southwest logo]()
$315
This Delta deal was found by Cheapflights users on 4/29. 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.
Fri 5/296:04 pm
STL
- BUF
1 stop4h 55m
Delta
Sat 5/305:26 pm
BUF
- STL
1 stop7h 33m
Delta
Deal found 4/29![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/26:17 pm
ORD
- BUF
Nonstop1h 46m
United Airlines
Sun 6/76:04 pm
BUF
- ORD
Nonstop1h 59m
United Airlines
Deal found 5/1![United Airlines logo]()
$313
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/212:50 pm
MDW
- BUF
1 stop7h 55m
Southwest
Sun 6/77:20 am
BUF
- MDW
Nonstop1h 40m
Southwest
Deal found 5/1![Southwest logo]()
$323
This Delta deal was found by Cheapflights users on 4/29. 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.
Fri 5/296:04 pm
STL
- BUF
1 stop4h 55m
Delta
Mon 6/14:55 pm
BUF
- STL
1 stop5h 43m
Delta
Deal found 4/29![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 4/27. 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.
Sat 5/231:55 pm
ORD
- BUF
2 stops8h 30m
Southwest
Tue 5/267:40 am
BUF
- ORD
1 stop9h 25m
Southwest
Deal found 4/27![Southwest logo]()
$325
This United Airlines deal was found by Cheapflights users on 4/27. 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 5/2810:25 am
STL
- BUF
1 stop5h 21m
United Airlines
Fri 5/295:57 pm
BUF
- STL
1 stop4h 24m
United Airlines
Deal found 4/27![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 4/29. 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 6/67:45 am
MDW
- BUF
Nonstop1h 35m
Southwest
Sun 6/77:20 am
BUF
- MDW
Nonstop1h 40m
Southwest
Deal found 4/29![Southwest logo]()
$327
This Delta deal was found by Cheapflights users on 4/29. 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.
Sun 5/246:00 am
STL
- BUF
1 stop7h 07m
Delta
Mon 6/14:55 pm
BUF
- STL
1 stop5h 43m
Delta
Deal found 4/29![Delta logo]()
$364
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Mon 7/271:13 pm
STL
- BUF
1 stop6h 28m
United Airlines
Tue 8/255:52 pm
BUF
- STL
1 stop4h 30m
United Airlines
Deal found 4/27![United Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/247:50 am
MDW
- BUF
2 stops5h 30m
Southwest
Wed 7/16:00 am
BUF
- MDW
2 stops7h 15m
Southwest
Deal found 4/30![Southwest logo]()
$337
Last-minute flights from Illinois to BuffaloDiscover last-minute flight deals from Illinois to Buffalo. Data last updated May 2, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Buffalo. Data last updated May 2, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 4/28. 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.
Wed 5/136:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Wed 5/202:49 pm
BUF
- MDW
1 stop8h 13m
Frontier
Deal found 4/28![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 4/28. 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.
Wed 5/136:55 am
ORD
- BUF
1 stop5h 59m
Frontier
Tue 5/1911:36 am
BUF
- ORD
1 stop9h 15m
Frontier
Deal found 4/28![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Tue 5/266:33 pm
STL
- BUF
1 stop18h 21m
Frontier
Tue 6/211:36 am
BUF
- STL
1 stop6h 57m
Frontier
Deal found 4/29![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Tue 5/266:33 pm
STL
- BUF
1 stop18h 21m
Frontier
Thu 6/411:36 am
BUF
- STL
1 stop6h 57m
Frontier
Deal found 4/29![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 5/261:50 pm
ORD
- BUF
1 stop23h 04m
Frontier
Tue 6/211:36 am
BUF
- ORD
1 stop9h 15m
Frontier
Deal found 4/28![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/275:27 pm
STL
- BUF
2 stops25h 37m
Frontier
Tue 6/211:36 am
BUF
- STL
1 stop6h 57m
Frontier
Deal found 4/29![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/276:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Wed 6/32:49 pm
BUF
- MDW
1 stop8h 13m
Frontier
Deal found 4/29![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Sat 5/3012:41 pm
BUF
- MDW
1 stop10h 21m
Frontier
Deal found 4/30![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/275:27 pm
STL
- BUF
2 stops25h 37m
Frontier
Thu 6/411:36 am
BUF
- STL
1 stop6h 57m
Frontier
Deal found 4/29![Frontier logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/276:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Sun 5/3111:36 am
BUF
- MDW
1 stop24h 33m
Frontier
Deal found 4/29![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Wed 6/32:49 pm
BUF
- MDW
1 stop8h 13m
Frontier
Deal found 4/30![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:31 pm
STL
- BUF
1 stop18h 24m
Frontier
Tue 6/1611:50 am
BUF
- STL
1 stop22h 02m
Frontier
Deal found 4/30![Frontier logo]()
$126
One-way flights from Illinois to BuffaloSearch for one-way flight options from Illinois to Buffalo. Find affordable one-way fares based on user searches. Data last updated May 2, 2026.
Search for one-way flight options from Illinois to Buffalo. Find affordable one-way fares based on user searches. Data last updated May 2, 2026.
This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Deal found 4/29![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Tue 9/11:50 pm
ORD
- BUF
1 stop23h 05m
Frontier
Deal found 4/27![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 6/16:00 am
MDW
- BUF
1 stop27h 41m
Frontier
Deal found 4/27![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 6/16:55 am
ORD
- BUF
1 stop26h 46m
Frontier
Deal found 4/27![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 7/2512:11 pm
MDW
- BUF
1 stop21h 28m
Frontier
Deal found 4/27![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 5/191:59 pm
ORD
- BUF
1 stop22h 55m
Frontier
Deal found 4/28![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Deal found 5/1![Frontier logo]()
$89
This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:55 am
ORD
- BUF
1 stop5h 59m
Frontier
Deal found 4/29![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 7/31:50 pm
ORD
- BUF
1 stop20h 44m
Frontier
Deal found 4/27![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/246:00 am
MDW
- BUF
1 stop6h 55m
Frontier
Deal found 4/29![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 4/30. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/178:39 am
ORD
- BUF
1 stop10h 25m
Frontier
Deal found 4/30![Frontier logo]()
$95
This Expedia deal was found by Cheapflights users on 4/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:39 am
ORD
- BUF
1 stop10h 25m
Frontier
Deal found 4/30![Frontier logo]()
$96
Find flight deals from Illinois to Buffalo
Keep the following information in mind while searching for Illinois to Buffalo flight deals. Data was last updated May 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $126 (Kiwi.com) |
One-way from | $70 (Frontier) |
Popular in | February |
Cheapest in | September |
Average price | $334 |
Good round-trip deal | $349 or less |
Good one-way deal | $194 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Buffalo 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 May 2, 2026.
Use the filters below to find and compare flights from Illinois to Buffalo that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoBuffalo
ORD - BUF
ORDBUF
Chicago O'Hare Intl
Tue 5/26
2:00 pm-4:46 pm
Nonstop1h 46m
Buffalo
Tue 6/2
5:52 pm-6:51 pm
Nonstop1h 59m
$237
ChicagoBuffalo
MDW - BUF
MDWBUF
Chicago Midway
Tue 5/26
7:50 am-10:20 am
Nonstop1h 30m
Buffalo
Tue 6/2
1:10 pm-4:15 pm
1 stop4h 05m
$247
ChicagoBuffalo
MDW - BUF
MDWBUF
Chicago Midway
Tue 5/19
7:50 am-10:20 am
Nonstop1h 30m
Buffalo
Thu 5/21
11:25 am-12:05 pm
Nonstop1h 40m
$251
ChicagoBuffalo
ORD - BUF
ORDBUF
Chicago O'Hare Intl
Sat 5/23
6:17 pm-9:03 pm
Nonstop1h 46m
Buffalo
Tue 5/26
5:57 pm-6:56 pm
Nonstop1h 59m
$251
ChicagoBuffalo
ORD - BUF
ORDBUF
Chicago O'Hare Intl
Sat 5/23
1:44 pm-6:51 pm
1 stop4h 07m
Buffalo
Tue 5/26
12:04 pm-4:29 pm
1 stop5h 25m
$271
St. LouisBuffalo
STL - BUF
STLBUF
Lambert-St Louis
Tue 5/26
6:04 pm-11:59 pm
1 stop4h 55m
Buffalo
Wed 6/3
6:04 am-12:23 pm
1 stop7h 19m
$277
Quickest round-trip
ChicagoBuffalo
MDW - BUF
MDWBUF
Chicago Midway
Sat 5/23
3:35 pm-6:00 pm
Nonstop1h 25m
Buffalo
Tue 5/26
3:10 pm-3:50 pm
Nonstop1h 40m
$286
ChicagoBuffalo
ORD - BUF
ORDBUF
Chicago O'Hare Intl
Sat 6/13
7:27 am-10:15 am
Nonstop1h 48m
Buffalo
Wed 6/17
1:54 pm-2:55 pm
Nonstop2h 01m
$293
ChicagoBuffalo
MDW - BUF
MDWBUF
Chicago Midway
Tue 6/9
6:55 pm-9:25 pm
Nonstop1h 30m
Buffalo
Fri 6/12
7:55 pm-8:35 pm
Nonstop1h 40m
$293
ChicagoBuffalo
ORD - BUF
ORDBUF
Chicago O'Hare Intl
Fri 5/29
6:17 pm-9:03 pm
Nonstop1h 46m
Buffalo
Tue 6/2
5:52 pm-6:51 pm
Nonstop1h 59m
$293
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Buffalo
Have a flexible travel schedule? Discover the best time to fly to Buffalo from Illinois with our price prediction graph.
ORD-BUF
MDW-BUF
CMI-BUF
STL-BUF
PIA-BUF
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 Illinois to Buffalo
USIL-BUF
ORD-BUF
MDW-BUF
CMI-BUF
STL-BUF
How far ahead should I book a flight from Illinois to Buffalo?
The price you pay for your flight from Illinois to Buffalo may vary depending on when you book. For the best chance of a lower fare, look to book 43 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Illinois to Buffalo?
Currently, May is the cheapest month in which you can book a flight from Illinois to Buffalo (average of $77). Flying from Illinois to Buffalo in March is currently the most expensive (average of $257). 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 IL to BUF?
Find hourly flight availability from Illinois to Buffalo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 2, 2026.
A simple way to save on the total cost of your ticket is to fly from Illinois to Buffalo in the evening. If you’re flexible enough to do this you can expect to save up to 12% on your trip compared to booking a flight at noon.
What is the cheapest day to fly from Illinois to Buffalo?
Use this chart to determine the cheapest time to fly round-trip from Illinois to Buffalo. Price data was last updated on May 2, 2026.
Travelers seeking maximum savings on their Illinois to Buffalo flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Illinois to Buffalo
Explore weekly flight availability from Illinois to Buffalo. 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 May 2, 2026.
The most flights from USIL to BUF are scheduled on a Saturday (35 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (28 on average).
How much does it cost to fly round-trip from Illinois to Buffalo?
Related info for your journey
Find useful and relevant information for your journey from Illinois to Buffalo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Buffalo?
Book flights to Buffalo if you plan to visit one of these locationsLockport
Cheektowaga
Batavia
Williamsville
Orchard Park
Eden
Amherst
West Seneca
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Buffalo flight routes
Complete your trip
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Alternative routes for Illinois to Buffalo
See prices for flight routes from nearby airports that may be better suited for you.
Other flights to Buffalo
Explore flights to Buffalo departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 2, 2026.
Complete your trip
Complete your trip to Buffalo by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Buffalo by cabin class
Find flights from Illinois to Buffalo, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Buffalo flights
Browse other Illinois and Buffalo flight options. Last updated on May 2, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Illinois to Buffalo flights
Consider these flights traveling from Illinois to Buffalo.
Top 5 airlines flying from Illinois to Buffalo
Discover the top 5 airlines that operate flights from Illinois to Buffalo. 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 May 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$254 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$132 | Average$190 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$326 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$206 | Average$327 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$278 | Average$425 | FlexibilityNo cancel fee | On-time63% |