$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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Apr 15 — Apr 221
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Buffalo to Illinois with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Buffalo to Illinois
Cheapest
Best
Last-minute
One-way
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 March 16, 2026.
Explore the most affordable flight options available from Buffalo to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/211:56 pm
BUF
- MDW
1 stop6h 35m
Frontier
Sat 4/257:34 pm
MDW
- BUF
1 stop14h 35m
Frontier
Deal found 3/14![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/291:56 pm
BUF
- MDW
1 stop6h 35m
Frontier
Wed 5/66:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Deal found 3/15![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/211:56 pm
BUF
- ORD
1 stop21h 06m
Frontier
Sat 4/254:28 pm
ORD
- BUF
1 stop17h 41m
Frontier
Deal found 3/14![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:56 pm
BUF
- ORD
1 stop28h 04m
Frontier
Tue 4/216:08 pm
ORD
- BUF
1 stop17h 34m
Frontier
Deal found 3/13![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/181:11 pm
BUF
- MDW
1 stop10h 03m
Frontier
Tue 4/212:15 pm
MDW
- BUF
1 stop21h 27m
Frontier
Deal found 3/13![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:32 pm
BUF
- ORD
1 stop22h 08m
Multiple Airlines
Fri 4/247:15 pm
ORD
- BUF
2 stops15h 58m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/291:56 pm
BUF
- ORD
1 stop21h 27m
Multiple Airlines
Wed 5/61:59 pm
ORD
- BUF
1 stop19h 42m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/251:11 pm
BUF
- MDW
1 stop6h 26m
Frontier
Sat 5/27:34 pm
MDW
- BUF
1 stop15h 03m
Frontier
Deal found 3/11![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/181:11 pm
BUF
- ORD
1 stop9h 01m
Multiple Airlines
Tue 4/2110:45 am
ORD
- BUF
1 stop24h 57m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$186
This Booking.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/151:56 pm
BUF
- MDW
1 stop6h 35m
Frontier
Fri 4/179:14 am
MDW
- BUF
1 stop24h 35m
Frontier
Deal found 3/15![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/251:11 pm
BUF
- ORD
1 stop9h 01m
Multiple Airlines
Sat 5/25:50 am
ORD
- BUF
1 stop28h 47m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/82:49 pm
BUF
- MDW
1 stop21h 15m
Frontier
Tue 5/1212:27 pm
MDW
- BUF
1 stop24h 27m
Frontier
Deal found 3/12![Frontier logo]()
$190
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 March 16, 2026.
Discover carefully curated flight deals from Buffalo to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 16, 2026.
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/181:35 pm
BUF
- ORD
1 stop6h 48m
Delta
Mon 4/205:15 am
ORD
- BUF
1 stop4h 46m
Delta
Deal found 3/11![Delta logo]()
$291
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:55 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Fri 4/177:05 pm
MDW
- BUF
Nonstop1h 25m
Southwest
Deal found 3/12![Southwest logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” 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 4/138:16 pm
BUF
- STL
1 stop28h 03m
Frontier
Mon 4/208:23 pm
STL
- BUF
1 stop15h 19m
Frontier
Deal found 3/16![Frontier logo]()
$298
This JetBlue deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/16:00 am
BUF
- ORD
1 stop7h 59m
JetBlue
Tue 8/410:48 am
ORD
- BUF
1 stop7h 41m
JetBlue
Deal found 3/15![JetBlue logo]()
$298
This American Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:00 am
BUF
- STL
1 stop6h 47m
American Airlines
Sat 4/188:00 am
STL
- BUF
1 stop5h 21m
American Airlines
Deal found 3/14![American Airlines logo]()
$307
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/277:00 am
BUF
- MLI
1 stop4h 09m
United Airlines
Tue 3/313:20 pm
MLI
- BUF
2 stops7h 30m
United Airlines
Deal found 3/12![United Airlines logo]()
$324
This Southwest deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/304:00 pm
BUF
- MDW
1 stop7h 20m
Southwest
Thu 5/77:50 am
MDW
- BUF
2 stops9h 20m
Southwest
Deal found 3/15![Southwest logo]()
$296
This Kiwi.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” 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 4/301:08 pm
BUF
- STL
1 stop18h 42m
Frontier
Thu 5/74:19 pm
STL
- BUF
1 stop25h 27m
Frontier
Deal found 3/16![Frontier logo]()
$317
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:00 am
BUF
- ORD
Nonstop1h 57m
United Airlines
Mon 4/202:33 pm
ORD
- BUF
Nonstop1h 43m
United Airlines
Deal found 3/12![United Airlines logo]()
$325
This American Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:00 am
BUF
- STL
1 stop5h 09m
American Airlines
Sun 5/37:05 am
STL
- BUF
1 stop6h 16m
American Airlines
Deal found 3/12![American Airlines logo]()
$344
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/113:40 pm
BUF
- STL
1 stop4h 30m
Southwest
Sat 4/186:10 am
STL
- BUF
2 stops9h 25m
Southwest
Deal found 3/14![Southwest logo]()
$314
This United Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/35:52 pm
BUF
- ORD
Nonstop1h 59m
United Airlines
Sun 6/72:06 pm
ORD
- BUF
Nonstop1h 46m
United Airlines
Deal found 3/13![United Airlines logo]()
$327
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1712:08 pm
BUF
- MDW
1 stop11h 18m
Frontier
Sun 4/192:15 pm
MDW
- BUF
1 stop20h 32m
Frontier
Deal found 3/15![Frontier logo]()
$335
This Delta deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/194:30 pm
BUF
- ORD
1 stop5h 46m
Delta
Sun 6/2110:35 am
ORD
- BUF
1 stop3h 36m
Delta
Deal found 3/12![Delta logo]()
$369
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1912:25 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Tue 4/217:50 am
MDW
- BUF
Nonstop1h 30m
Southwest
Deal found 3/14![Southwest logo]()
$327
This American Airlines deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/168:00 am
BUF
- STL
1 stop6h 15m
American Airlines
Fri 6/193:12 pm
STL
- BUF
1 stop5h 11m
American Airlines
Deal found 3/15![American Airlines logo]()
$369
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/45:55 pm
BUF
- STL
1 stop4h 18m
United Airlines
Tue 5/59:21 am
STL
- BUF
1 stop6h 33m
United Airlines
Deal found 3/11![United Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/33:10 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Sun 6/75:30 am
MDW
- BUF
1 stop6h 10m
Southwest
Deal found 3/13![Southwest logo]()
$337
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/27:00 am
BUF
- ORD
Nonstop1h 57m
United Airlines
Sun 4/510:30 am
ORD
- BUF
Nonstop1h 43m
United Airlines
Deal found 3/12![United Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/75:20 pm
BUF
- MDW
1 stop6h 00m
Southwest
Sun 5/107:55 am
MDW
- BUF
Nonstop1h 30m
Southwest
Deal found 3/11![Southwest logo]()
$340
This United Airlines deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/55:52 pm
BUF
- ORD
Nonstop1h 59m
United Airlines
Sun 6/77:17 am
ORD
- BUF
Nonstop1h 48m
United Airlines
Deal found 3/11![United Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/304:05 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Mon 8/37:05 pm
MDW
- BUF
Nonstop1h 30m
Southwest
Deal found 3/15![Southwest logo]()
$349
This United Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/287:00 am
BUF
- MLI
1 stop4h 09m
United Airlines
Sat 4/41:55 pm
MLI
- BUF
1 stop5h 54m
United Airlines
Deal found 3/13![United Airlines logo]()
$384
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/267:55 pm
BUF
- MDW
Nonstop1h 40m
Southwest
Mon 6/297:00 pm
MDW
- BUF
1 stop4h 10m
Southwest
Deal found 3/13![Southwest logo]()
$359
This Southwest deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/175:20 pm
BUF
- STL
1 stop7h 05m
Southwest
Sun 4/195:25 am
STL
- BUF
1 stop4h 00m
Southwest
Deal found 3/15![Southwest logo]()
$387
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/245:20 pm
BUF
- STL
1 stop7h 05m
Southwest
Sun 4/265:25 am
STL
- BUF
1 stop4h 00m
Southwest
Deal found 3/13![Southwest logo]()
$387
This United Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/287:00 am
BUF
- MLI
1 stop4h 09m
United Airlines
Wed 4/13:20 pm
MLI
- BUF
1 stop4h 23m
United Airlines
Deal found 3/13![United Airlines logo]()
$493
This Delta deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/281:35 pm
BUF
- MLI
2 stops9h 55m
Delta
Sat 4/46:00 am
MLI
- BUF
2 stops12h 13m
Delta
Deal found 3/13![Delta logo]()
$1,230
Last-minute flights from Buffalo to IllinoisDiscover last-minute flight deals from Buffalo to Illinois. Data last updated March 16, 2026 and is based on user searches.
Discover last-minute flight deals from Buffalo to Illinois. Data last updated March 16, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:56 pm
BUF
- ORD
1 stop28h 04m
Frontier
Tue 4/216:08 pm
ORD
- BUF
1 stop17h 34m
Frontier
Deal found 3/13![Frontier logo]()
$170
This Booking.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/151:56 pm
BUF
- MDW
1 stop6h 35m
Frontier
Fri 4/179:14 am
MDW
- BUF
1 stop24h 35m
Frontier
Deal found 3/15![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/181:11 pm
BUF
- MDW
1 stop10h 03m
Frontier
Tue 4/212:15 pm
MDW
- BUF
1 stop21h 27m
Frontier
Deal found 3/13![Frontier logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/181:11 pm
BUF
- ORD
1 stop9h 01m
Multiple Airlines
Tue 4/2110:45 am
ORD
- BUF
1 stop24h 57m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:32 pm
BUF
- ORD
1 stop22h 08m
Multiple Airlines
Fri 4/247:15 pm
ORD
- BUF
2 stops15h 58m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/211:56 pm
BUF
- MDW
1 stop6h 35m
Frontier
Sat 4/257:34 pm
MDW
- BUF
1 stop14h 35m
Frontier
Deal found 3/14![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/211:56 pm
BUF
- ORD
1 stop21h 06m
Frontier
Sat 4/254:28 pm
ORD
- BUF
1 stop17h 41m
Frontier
Deal found 3/14![Frontier logo]()
$169
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/251:11 pm
BUF
- MDW
1 stop6h 26m
Frontier
Sat 5/27:34 pm
MDW
- BUF
1 stop15h 03m
Frontier
Deal found 3/11![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/251:11 pm
BUF
- ORD
1 stop9h 01m
Multiple Airlines
Sat 5/25:50 am
ORD
- BUF
1 stop28h 47m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$189
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2712:32 pm
BUF
- ORD
1 stop22h 30m
Frontier
Wed 4/296:08 pm
ORD
- BUF
1 stop17h 04m
Frontier
Deal found 3/13![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/291:56 pm
BUF
- MDW
1 stop6h 35m
Frontier
Wed 5/66:00 am
MDW
- BUF
1 stop6h 54m
Frontier
Deal found 3/15![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/291:56 pm
BUF
- ORD
1 stop21h 27m
Multiple Airlines
Wed 5/61:59 pm
ORD
- BUF
1 stop19h 42m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$178
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 March 16, 2026.
Search for one-way flight options from Buffalo to Illinois. Find affordable one-way fares based on user searches. Data last updated March 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/132:49 pm
BUF
- MDW
1 stop8h 13m
Frontier
Deal found 3/11![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:42 pm
BUF
- ORD
1 stop29h 18m
Frontier
Deal found 3/11![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/141:56 pm
BUF
- MDW
1 stop9h 18m
Frontier
Deal found 3/12![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1211:36 am
BUF
- ORD
1 stop21h 19m
Frontier
Deal found 3/12![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/912:41 pm
BUF
- ORD
1 stop9h 31m
Multiple Airlines
Deal found 3/11![Multiple Airlines logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/912:41 pm
BUF
- MDW
1 stop23h 31m
Frontier
Deal found 3/12![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/151:56 pm
BUF
- ORD
1 stop22h 36m
Frontier
Deal found 3/13![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/151:56 pm
BUF
- MDW
1 stop6h 35m
Frontier
Deal found 3/14![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/301:08 pm
BUF
- MDW
1 stop7h 23m
Frontier
Deal found 3/15![Frontier logo]()
$89
This Expedia deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/91:02 pm
BUF
- MDW
1 stop8h 05m
Frontier
Deal found 3/11![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:42 pm
BUF
- MDW
1 stop10h 37m
Frontier
Deal found 3/14![Frontier logo]()
$96
This Frontier deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/812:18 pm
BUF
- ORD
1 stop11h 21m
Frontier
Deal found 3/13![Frontier logo]()
$96
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 March 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $166 (Kiwi.com) |
One-way from | $70 (Kiwi.com) |
Popular in | March |
Cheapest in | August |
Average price | $465 |
Good round-trip deal | $357 or less |
Good one-way deal | $165 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 March 16, 2026.
Use the filters below to find and compare flights from Buffalo to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Sat 4/18
1:35 pm-7:23 pm
1 stop6h 48m
Chicago O'Hare Intl
Mon 4/20
5:15 am-11:01 am
1 stop4h 46m
$291
Quickest round-trip
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Wed 4/15
6:55 pm-7:35 pm
Nonstop1h 40m
Chicago Midway
Fri 4/17
7:05 pm-9:30 pm
Nonstop1h 25m
$293
BuffaloChicago
BUF - MDW
BUFMDW
Buffalo
Thu 4/30
4:00 pm-10:20 pm
1 stop7h 20m
Chicago Midway
Thu 5/7
7:50 am-6:10 pm
2 stops9h 20m
$296
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Mon 4/13
8:16 pm-11:19 pm
1 stop28h 03m
Lambert-St Louis
Mon 4/20
8:23 pm-12:42 pm
1 stop15h 19m
$298
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Sat 8/1
6:00 am-12:59 pm
1 stop7h 59m
Chicago O'Hare Intl
Tue 8/4
10:48 am-7:29 pm
1 stop7h 41m
$298
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Sat 4/11
6:00 am-11:47 am
1 stop6h 47m
Lambert-St Louis
Sat 4/18
8:00 am-2:21 pm
1 stop5h 21m
$307
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Sat 4/11
3:40 pm-7:10 pm
1 stop4h 30m
Lambert-St Louis
Sat 4/18
6:10 am-4:35 pm
2 stops9h 25m
$314
BuffaloSt. Louis
BUF - STL
BUFSTL
Buffalo
Thu 4/30
1:08 pm-6:50 am
1 stop18h 42m
Lambert-St Louis
Thu 5/7
4:19 pm-6:46 pm
1 stop25h 27m
$317
BuffaloMoline
BUF - MLI
BUFMLI
Buffalo
Fri 3/27
7:00 am-10:09 am
1 stop4h 09m
Moline Quad-City
Tue 3/31
3:20 pm-11:50 pm
2 stops7h 30m
$324
BuffaloChicago
BUF - ORD
BUFORD
Buffalo
Sat 4/18
7:00 am-7:57 am
Nonstop1h 57m
Chicago O'Hare Intl
Mon 4/20
2:33 pm-5:16 pm
Nonstop1h 43m
$325
Showing 1-10 of 57 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-MDW
BUF-ORD
BUF-STL
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-MDW
BUF-ORD
BUF-STL
BUF-MLI
What is the cheapest month to book a flight from Buffalo to Illinois?
Currently, July is the cheapest month in which you can book a flight from Buffalo to Illinois (average of $77). Flying from Buffalo to Illinois in December is currently the most expensive (average of $259). 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 March 16, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 27% on flights from Buffalo to Illinois by exploring options for tickets in the morning.
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 March 14, 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.
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 March 16, 2026.
The most flights from BUF to USIL are scheduled on a Monday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 on average).
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 March 16, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andAmerican Airlines from Buffalo to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Food
7.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
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.
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
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for Buffalo to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
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 March 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Buffalo to Illinois flights
Consider these flights traveling from Buffalo to Illinois.
Top 4 airlines flying from Buffalo to Illinois
Discover the top 4 airlines that operate flights from Buffalo to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$92 | Average$200 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$145 | Average$321 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$145 | Average$314 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$237 | Average$347 | FlexibilityNo cancel fee | On-time63% |