$103+ Cheap flights from Buffalo (BUF) to Illinois
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Oct 20 — Oct 271
Round-trip
1 adult, Economy
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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
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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 September 20, 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 September 20, 2026.
This CheapOair deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:54 pm -
1 stop11h 22m
Sat 10/314:26 pm -
1 stop25h 26m
Deal found 9/17![Frontier logo]()
$202
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/209:06 am -
1 stop5h 47m
Wed 10/216:47 am -
1 stop3h 48m
Deal found 9/15![Delta logo]()
$227
This Southwest deal was found by Cheapflights users on 9/15. 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.
Tue 10/204:25 pm -
2 stops6h 40m
Wed 10/215:45 am -
1 stop6h 35m
Deal found 9/15![Southwest logo]()
$232
This Frontier deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/241:44 pm -
1 stop10h 59m
Wed 10/286:16 am -
1 stop5h 59m
Deal found 9/17![Frontier logo]()
$232
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Wed 10/211:44 pm -
1 stop10h 59m
Thu 10/226:40 pm -
1 stop17h 19m
Deal found 9/16![Frontier logo]()
$236
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/42:00 pm -
1 stop19h 56m
Tue 11/107:28 pm -
1 stop16h 47m
Deal found 9/19![Frontier logo]()
$236
This Expedia deal was found by Cheapflights users on 9/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/128:02 pm -
1 stop28h 14m
Mon 11/235:59 pm -
1 stop25h 25m
Deal found 9/16![Frontier logo]()
$237
This Super.com deal was found by Cheapflights users on 9/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:53 pm -
1 stop19h 38m
Tue 10/208:46 am -
1 stop8h 10m
Deal found 9/16![Frontier logo]()
$237
This Frontier deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/42:00 pm -
1 stop10h 47m
Wed 11/116:16 am -
1 stop5h 59m
Deal found 9/19![Frontier logo]()
$238
This Cheapflightsfares deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 12/111:15 pm -
1 stop9h 27m
Mon 12/145:35 am -
1 stop7h 09m
Deal found 9/20![Frontier logo]()
$238
This American Airlines deal was found by Cheapflights users on 9/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:46 pm -
1 stop6h 13m
Sat 11/1411:23 am -
1 stop5h 42m
Deal found 9/16![American Airlines logo]()
$241
This Kiwi.com deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/61:48 pm -
1 stop29h 28m
Tue 11/107:28 pm -
1 stop16h 47m
Deal found 9/19![Frontier logo]()
$244
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 September 20, 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 September 20, 2026.
This Delta deal was found by Cheapflights users on 9/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/313:53 pm -
1 stop5h 37m
Sat 11/72:00 pm -
1 stop5h 48m
Deal found 9/16![Delta logo]()
$271
This Southwest deal was found by Cheapflights users on 9/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/267:35 pm -
Nonstop1h 40m
Thu 10/297:55 am -
Nonstop1h 30m
Deal found 9/16![Southwest logo]()
$287
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 11/116:30 am -
1 stop5h 02m
Mon 11/236:00 am -
2 stops7h 20m
Deal found 9/17![United Airlines logo]()
$296
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/67:57 am -
1 stop3h 53m
Sat 11/144:57 pm -
1 stop3h 40m
Deal found 9/15![American Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/173:53 pm -
1 stop3h 07m
Mon 10/196:44 pm -
1 stop4h 15m
Deal found 9/15![Delta logo]()
$289
This Southwest deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:00 am -
2 stops6h 35m
Sat 10/316:10 am -
1 stop3h 40m
Deal found 9/17![Southwest logo]()
$317
This United Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/195:45 pm -
Nonstop2h 02m
Tue 10/206:50 am -
Nonstop1h 39m
Deal found 9/18![United Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 9/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/172:10 pm -
1 stop6h 10m
Mon 10/197:30 pm -
1 stop3h 29m
Deal found 9/16![Delta logo]()
$299
This Southwest deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/144:35 pm -
Nonstop1h 50m
Mon 11/166:15 pm -
Nonstop1h 40m
Deal found 9/19![Southwest logo]()
$317
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:00 am -
2 stops10h 43m
Tue 11/179:40 am -
1 stop6h 22m
Deal found 9/15![United Airlines logo]()
$326
This American Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/64:35 pm -
2 stops8h 36m
Sat 10/105:03 pm -
1 stop5h 56m
Deal found 9/17![American Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 9/15. 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 11/135:30 pm -
1 stop6h 45m
Mon 11/161:15 pm -
2 stops7h 45m
Deal found 9/15![Southwest logo]()
$331
This Delta deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/29:06 am -
1 stop4h 53m
Mon 11/92:37 pm -
1 stop7h 16m
Deal found 9/18![Delta logo]()
$337
This United Airlines deal was found by Cheapflights users on 9/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:45 pm -
Nonstop2h 02m
Mon 10/196:00 pm -
Nonstop1h 47m
Deal found 9/16![United Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/176:00 am -
2 stops8h 55m
Sat 10/174:20 pm -
Nonstop1h 35m
Deal found 9/18![Southwest logo]()
$332
This Delta deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/43:54 pm -
1 stop5h 36m
Sat 11/72:00 pm -
1 stop5h 48m
Deal found 9/19![Delta logo]()
$337
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/247:00 am -
Nonstop2h 00m
Wed 10/282:18 pm -
Nonstop1h 44m
Deal found 9/17![United Airlines logo]()
$341
This Delta deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/77:00 am -
1 stop6h 46m
Sat 11/75:29 pm -
1 stop4h 09m
Deal found 9/19![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/196:00 am -
1 stop3h 50m
Fri 10/2311:00 am -
1 stop6h 40m
Deal found 9/18![Southwest logo]()
$353
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/75:45 pm -
1 stop5h 53m
Sun 10/112:28 pm -
1 stop5h 19m
Deal found 9/17![United Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 11/56:15 am -
1 stop4h 17m
Fri 11/66:44 pm -
1 stop2h 54m
Deal found 9/19![Delta logo]()
$353
This Southwest deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” 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 12/137:20 am -
1 stop3h 45m
Wed 12/1611:55 am -
2 stops9h 00m
Deal found 9/19![Southwest logo]()
$354
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:58 pm -
Nonstop2h 04m
Mon 11/92:18 pm -
Nonstop1h 44m
Deal found 9/15![United Airlines logo]()
$376
This Southwest deal was found by Cheapflights users on 9/15. 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.
Sat 10/178:50 am -
Nonstop1h 40m
Mon 10/198:55 pm -
1 stop10h 30m
Deal found 9/15![Southwest logo]()
$359
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/99:06 am -
1 stop5h 47m
Sun 10/116:47 am -
1 stop3h 20m
Deal found 9/15![Delta logo]()
$361
This Southwest deal was found by Cheapflights users on 9/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:30 am -
Nonstop1h 40m
Tue 10/201:15 pm -
Nonstop1h 30m
Deal found 9/16![Southwest logo]()
$360
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/105:45 pm -
Nonstop2h 02m
Sun 10/112:00 pm -
Nonstop1h 43m
Deal found 9/15![United Airlines logo]()
$397
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/255:58 pm -
Nonstop2h 04m
Sat 11/285:59 pm -
Nonstop1h 52m
Deal found 9/15![United Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” 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 10/169:40 am -
2 stops10h 25m
Fri 10/234:30 pm -
2 stops6h 15m
Deal found 9/18![Southwest logo]()
$377
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 10/66:30 am -
2 stops7h 07m
Sat 10/102:28 pm -
2 stops8h 22m
Deal found 9/17![United Airlines logo]()
$405
Last-minute flights from Buffalo to IllinoisDiscover last-minute flight deals from Buffalo to Illinois. Data last updated September 20, 2026 and is based on user searches.
Discover last-minute flight deals from Buffalo to Illinois. Data last updated September 20, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 9/15. 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.
Sat 10/101:44 pm -
1 stop10h 59m
Mon 10/126:15 am -
1 stop5h 44m
Deal found 9/15![Frontier logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 9/15. 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.
Tue 10/136:51 pm -
1 stop14h 00m
Tue 10/207:44 pm -
1 stop16h 15m
Deal found 9/15![Frontier logo]()
$250
This American Airlines deal was found by Cheapflights users on 9/15. 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 10/135:50 pm -
Nonstop2h 10m
Tue 10/209:16 pm -
Nonstop1h 43m
Deal found 9/15![American Airlines logo]()
$251
This Super.com deal was found by Cheapflights users on 9/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:53 pm -
1 stop19h 38m
Tue 10/208:46 am -
1 stop8h 10m
Deal found 9/16![Frontier logo]()
$237
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/209:06 am -
1 stop5h 47m
Wed 10/216:47 am -
1 stop3h 48m
Deal found 9/15![Delta logo]()
$227
This Southwest deal was found by Cheapflights users on 9/15. 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.
Tue 10/204:25 pm -
2 stops6h 40m
Wed 10/215:45 am -
1 stop6h 35m
Deal found 9/15![Southwest logo]()
$232
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Wed 10/211:44 pm -
1 stop10h 59m
Thu 10/226:40 pm -
1 stop17h 19m
Deal found 9/16![Frontier logo]()
$236
This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Wed 10/211:44 pm -
2 stops11h 42m
Thu 10/227:44 pm -
1 stop16h 15m
Deal found 9/16![Frontier logo]()
$249
This Southwest deal was found by Cheapflights users on 9/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/212:00 pm -
Nonstop1h 40m
Wed 11/48:10 am -
Nonstop1h 30m
Deal found 9/16![Southwest logo]()
$251
This Frontier deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/241:44 pm -
1 stop10h 59m
Wed 10/286:16 am -
1 stop5h 59m
Deal found 9/17![Frontier logo]()
$232
This CheapOair deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:54 pm -
1 stop11h 22m
Sat 10/314:26 pm -
1 stop25h 26m
Deal found 9/17![Frontier logo]()
$202
This Expedia deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/301:48 pm -
1 stop10h 59m
Mon 11/26:16 am -
1 stop5h 47m
Deal found 9/18![Frontier logo]()
$250
One-way flights from Buffalo to IllinoisSearch for one-way flight options from Buffalo to Illinois. Find affordable one-way fares based on user searches. Data last updated September 20, 2026.
Search for one-way flight options from Buffalo to Illinois. Find affordable one-way fares based on user searches. Data last updated September 20, 2026.
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/241:44 pm -
1 stop5h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$103
This Trip.com deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/21:48 pm -
1 stop24h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 11/131:48 pm -
1 stop29h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 11/161:48 pm -
1 stop29h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$107
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/241:44 pm -
1 stop10h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$108
This Trip.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/282:00 pm -
1 stop10h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$110
This CheapOair deal was found by Cheapflights users on 9/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/141:44 pm -
1 stop5h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/182:00 pm -
1 stop10h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$112
This Gotogate deal was found by Cheapflights users on 9/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/66:51 pm -
1 stop29h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” 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 11/131:48 pm -
1 stop28h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$117
This CheapOair deal was found by Cheapflights users on 9/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/231:44 pm -
1 stop22h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 11/161:48 pm -
1 stop28h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$119
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 September 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $202 (CheapOair) |
One-way from | $103 (Booking.com) |
Popular in | March |
Cheapest in | February |
Average price | $323 |
Good round-trip deal | $355 or less |
Good one-way deal | $200 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 7,457,451 searches. Data last updated September 20, 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 Buffalo - ORD Chicago O'Hare Intl
BUFORD
Buffalo
Wed 10/14
7:00 am-8:00 am
Nonstop2h 00m
Chicago O'Hare Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$126
BuffaloSt. Louis
BUF Buffalo - STL Lambert-St Louis
BUFSTL
Buffalo
Thu 10/15
12:53 pm-11:13 pm
1 stop11h 20m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$131
BuffaloChicago
BUF Buffalo - MDW Chicago Midway
BUFMDW
Buffalo
Tue 11/17
9:00 am-12:51 pm
1 stop4h 51m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$136
BuffaloChicago
BUF Buffalo - MDW Chicago Midway
BUFMDW
Buffalo
Wed 12/16
8:25 am-3:00 pm
1 stop7h 35m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$136
BuffaloChicago
BUF Buffalo - MDW Chicago Midway
BUFMDW
Buffalo
Sat 10/24
12:30 pm-6:00 pm
2 stops6h 30m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$141
BuffaloChicago
BUF Buffalo - MDW Chicago Midway
BUFMDW
Buffalo
Tue 11/17
7:05 am-2:55 pm
2 stops8h 50m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$141
BuffaloChicago
BUF Buffalo - ORD Chicago O'Hare Intl
BUFORD
Buffalo
Wed 10/7
6:00 am-10:28 am
1 stop5h 28m
Chicago O'Hare Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$145
BuffaloChicago
BUF Buffalo - ORD Chicago O'Hare Intl
BUFORD
Buffalo
Sat 10/17
2:10 pm-7:20 pm
1 stop6h 10m
Chicago O'Hare Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$146
BuffaloChicago
BUF Buffalo - ORD Chicago O'Hare Intl
BUFORD
Buffalo
Tue 10/27
2:10 pm-7:20 pm
1 stop6h 10m
Chicago O'Hare Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$146
BuffaloChicago
BUF Buffalo - MDW Chicago Midway
BUFMDW
Buffalo
Thu 12/17
6:00 am-9:37 am
1 stop4h 37m
Chicago Midway
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$154
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Buffalo to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Buffalo with our price prediction graph.
BUF-STL
BUF-MDW
BUF-ORD
BUF-MLI
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Buffalo to Illinois
BUF-USIL
BUF-STL
BUF-MDW
BUF-ORD
BUF-MLI
What is the cheapest month to book a flight from Buffalo to Illinois?
Currently, January is the cheapest month in which you can book a flight from Buffalo to Illinois (average of $278). Flying from Buffalo to Illinois in March is currently the most expensive (average of $433). 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 September 20, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 23% 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 September 20, 2026.
The most flights from BUF to USIL are scheduled on a Saturday (35 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (15 on average).
How much does it cost to fly round-trip from Buffalo to Illinois?
Airfare is below average for this route at the moment.
Buffalo to Illinois flights typically cost between $296 and $474 in November.The cheapest round-trip price found within the last 5 days was $236 on Frontier (Nov 4-Nov 10).
How far ahead should I book a flight from Buffalo to Illinois?
The best time to book flights from Buffalo to Illinois is 87 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 September 12, 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. Sunday 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 September 20, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andJetBlue 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.
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Comfort
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from Buffalo to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Buffalo to Illinois
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Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Buffalo to Illinois by cabin class
Find flights from Buffalo to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Buffalo and Illinois flights
Browse other Buffalo and Illinois flight options. Last updated on September 20, 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 3 airlines flying from Buffalo to Illinois
Discover the top 3 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 7,457,451 searches. Data last updated September 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$145 | Average$366 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$237 | Average$364 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$263 | Average$389 | FlexibilityNo cancel fee | On-time63% |