$77+ Cheap flights from Illinois to Buffalo (BUF)
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 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BUF
Oct 19 — Oct 261
Round-trip
1 adult, Economy
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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 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 September 19, 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 September 19, 2026.
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.
Wed 10/146:00 am -
1 stop5h 46m
Wed 10/218:00 am -
1 stop5h 35m
Deal found 9/16![American Airlines logo]()
$227
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 10/142:20 pm -
2 stops7h 05m
Wed 10/218:00 am -
1 stop4h 35m
Deal found 9/16![Southwest logo]()
$232
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:15 am -
1 stop5h 44m
Mon 10/261:44 pm -
1 stop10h 59m
Deal found 9/15![Frontier logo]()
$246
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 12/16:20 am -
1 stop3h 20m
Sat 12/56:00 am -
2 stops9h 10m
Deal found 9/15![Southwest logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/237:44 pm -
1 stop16h 15m
Mon 10/261:44 pm -
1 stop24h 07m
Deal found 9/14![Frontier logo]()
$246
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.
Thu 12/106:15 am -
1 stop11h 31m
Fri 12/1111:38 am -
1 stop9h 38m
Deal found 9/16![Frontier logo]()
$247
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.
Sat 10/318:20 am -
Nonstop1h 30m
Tue 11/36:55 pm -
Nonstop1h 50m
Deal found 9/17![Southwest logo]()
$251
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 10/106:29 am -
Nonstop1h 39m
Wed 10/1410:46 am -
Nonstop1h 59m
Deal found 9/17![United Airlines logo]()
$251
This Southwest deal was found by Cheapflights users on 9/14. 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 10/244:20 pm -
Nonstop1h 35m
Wed 10/287:00 pm -
Nonstop1h 40m
Deal found 9/14![Southwest logo]()
$252
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Sat 10/246:00 am -
1 stop5h 59m
Mon 10/261:44 pm -
1 stop24h 07m
Deal found 9/14![Frontier logo]()
$253
This Frontier deal was found by Cheapflights users on 9/14. 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.
Wed 10/216:21 am -
1 stop5h 38m
Mon 10/261:44 pm -
1 stop10h 59m
Deal found 9/14![Frontier logo]()
$254
This Frontier deal was found by Cheapflights users on 9/14. 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.
Wed 10/216:21 am -
1 stop5h 38m
Fri 10/301:48 pm -
1 stop10h 59m
Deal found 9/14![Frontier logo]()
$255
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 September 19, 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 September 19, 2026.
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 10/142:20 pm -
2 stops7h 05m
Wed 10/2112:35 pm -
2 stops7h 25m
Deal found 9/16![Southwest logo]()
$238
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:00 pm -
Nonstop1h 47m
Thu 10/157:00 am -
Nonstop2h 00m
Deal found 9/14![United Airlines logo]()
$269
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 10/106:44 pm -
1 stop2h 54m
Mon 10/126:15 am -
1 stop4h 17m
Deal found 9/16![Delta logo]()
$308
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.
Sat 11/711:20 am -
1 stop5h 45m
Mon 11/97:57 am -
1 stop3h 53m
Deal found 9/15![American Airlines logo]()
$339
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 12/16:20 am -
1 stop3h 20m
Sat 12/56:00 am -
2 stops9h 10m
Deal found 9/15![Southwest logo]()
$246
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.
Mon 10/56:00 pm -
Nonstop1h 47m
Wed 10/710:46 am -
Nonstop1h 59m
Deal found 9/15![United Airlines logo]()
$269
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 10/156:00 pm -
Nonstop1h 47m
Thu 10/2210:46 am -
Nonstop1h 59m
Deal found 9/15![United Airlines logo]()
$287
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.
Fri 10/234:30 pm -
2 stops6h 15m
Mon 10/267:20 pm -
1 stop6h 15m
Deal found 9/17![Southwest logo]()
$296
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 11/65:09 pm -
1 stop5h 50m
Mon 11/96:00 am -
1 stop5h 23m
Deal found 9/15![Delta logo]()
$339
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 10/1611:00 am -
1 stop6h 40m
Wed 10/2112:35 pm -
1 stop4h 30m
Deal found 9/15![Southwest logo]()
$308
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.
Sat 10/176:29 am -
Nonstop1h 39m
Wed 10/215:45 pm -
Nonstop2h 02m
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 10/105:29 pm -
1 stop4h 09m
Mon 10/126:00 am -
1 stop5h 28m
Deal found 9/16![Delta logo]()
$355
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.
Sat 12/122:34 pm -
1 stop6h 03m
Tue 12/156:45 pm -
1 stop6h 14m
Deal found 9/16![American Airlines logo]()
$409
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 10/178:00 am -
Nonstop1h 30m
Wed 10/218:25 am -
Nonstop1h 40m
Deal found 9/18![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.
Sat 10/106:29 am -
Nonstop1h 39m
Mon 10/1210:46 am -
Nonstop1h 59m
Deal found 9/15![United Airlines logo]()
$338
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.
Thu 10/296:00 am -
1 stop6h 29m
Sun 11/112:15 pm -
1 stop5h 17m
Deal found 9/16![Delta logo]()
$383
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 11/253:55 pm -
1 stop5h 40m
Fri 11/278:05 am -
2 stops12h 05m
Deal found 9/16![Southwest 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 10/173:41 pm -
1 stop4h 06m
Sat 10/247:00 am -
1 stop4h 06m
Deal found 9/17![United Airlines logo]()
$339
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/205:00 am -
1 stop4h 47m
Mon 11/237:52 am -
1 stop7h 07m
Deal found 9/18![American Airlines logo]()
$457
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.
Thu 10/159:00 pm -
1 stop9h 50m
Mon 10/196:00 am -
2 stops7h 15m
Deal found 9/18![Southwest logo]()
$340
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.
Fri 10/302:30 pm -
2 stops8h 02m
Mon 11/26:46 pm -
1 stop6h 13m
Deal found 9/17![American Airlines logo]()
$462
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.
Thu 11/125:51 pm -
Nonstop1h 45m
Sun 11/155:58 pm -
Nonstop2h 04m
Deal found 9/17![United Airlines logo]()
$363
This Southwest deal was found by Cheapflights users on 9/14. 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.
Fri 10/161:00 pm -
1 stop4h 40m
Sun 10/185:50 am -
1 stop4h 30m
Deal found 9/14![Southwest logo]()
$341
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.
Thu 10/152:28 pm -
1 stop5h 19m
Sat 10/177:00 am -
1 stop6h 37m
Deal found 9/18![United Airlines logo]()
$372
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.
Wed 10/213:05 pm -
2 stops6h 20m
Thu 10/222:50 pm -
1 stop6h 05m
Deal found 9/18![Southwest logo]()
$342
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 9/306:15 am -
2 stops7h 08m
Sun 10/47:00 am -
1 stop4h 06m
Deal found 9/15![United Airlines logo]()
$374
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.
Thu 10/157:55 am -
Nonstop1h 30m
Thu 10/157:20 pm -
1 stop6h 05m
Deal found 9/18![Southwest logo]()
$343
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.
Mon 10/191:29 pm -
1 stop6h 18m
Thu 10/227:00 am -
1 stop6h 13m
Deal found 9/16![United Airlines logo]()
$377
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.
Thu 10/159:00 pm -
1 stop9h 50m
Sun 10/185:50 am -
1 stop4h 30m
Deal found 9/18![Southwest logo]()
$349
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.
Thu 10/155:00 am -
1 stop5h 00m
Mon 10/192:20 pm -
Nonstop1h 40m
Deal found 9/15![Southwest logo]()
$353
Last-minute flights from Illinois to BuffaloDiscover last-minute flight deals from Illinois to Buffalo. Data last updated September 19, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Buffalo. Data last updated September 19, 2026 and is based on user searches.
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 10/106:29 am -
Nonstop1h 39m
Wed 10/1410:46 am -
Nonstop1h 59m
Deal found 9/17![United Airlines logo]()
$251
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 10/137:44 pm -
1 stop16h 15m
Tue 10/206:51 pm -
1 stop14h 00m
Deal found 9/15![Frontier logo]()
$257
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.
Wed 10/146:00 am -
1 stop5h 46m
Wed 10/218:00 am -
1 stop5h 35m
Deal found 9/16![American Airlines logo]()
$227
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 10/142:20 pm -
2 stops7h 05m
Wed 10/218:00 am -
1 stop4h 35m
Deal found 9/16![Southwest logo]()
$232
This Frontier deal was found by Cheapflights users on 9/14. 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.
Wed 10/216:21 am -
1 stop5h 38m
Mon 10/261:44 pm -
1 stop10h 59m
Deal found 9/14![Frontier logo]()
$254
This Frontier deal was found by Cheapflights users on 9/14. 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.
Wed 10/216:21 am -
1 stop5h 38m
Fri 10/301:48 pm -
1 stop10h 59m
Deal found 9/14![Frontier logo]()
$255
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:15 am -
1 stop5h 44m
Mon 10/261:44 pm -
1 stop10h 59m
Deal found 9/15![Frontier logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/237:44 pm -
1 stop16h 15m
Mon 10/261:44 pm -
1 stop24h 07m
Deal found 9/14![Frontier logo]()
$246
This Southwest deal was found by Cheapflights users on 9/14. 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 10/244:20 pm -
Nonstop1h 35m
Wed 10/287:00 pm -
Nonstop1h 40m
Deal found 9/14![Southwest logo]()
$252
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Sat 10/246:00 am -
1 stop5h 59m
Mon 10/261:44 pm -
1 stop24h 07m
Deal found 9/14![Frontier logo]()
$253
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.
Sat 10/318:20 am -
Nonstop1h 30m
Tue 11/36:55 pm -
Nonstop1h 50m
Deal found 9/17![Southwest logo]()
$251
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.
Sat 10/318:20 am -
Nonstop1h 30m
Sat 11/71:10 pm -
1 stop7h 30m
Deal found 9/16![Southwest logo]()
$261
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 September 19, 2026.
Search for one-way flight options from Illinois to Buffalo. Find affordable one-way fares based on user searches. Data last updated September 19, 2026.
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 10/236:35 pm -
1 stop17h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$77
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.
Wed 10/286:16 am -
1 stop5h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$104
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.
Wed 10/146:21 am -
1 stop5h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$106
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.
Wed 10/146:00 am -
1 stop5h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![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.
Tue 11/177:15 am -
1 stop29h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$107
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 11/187:28 pm -
1 stop17h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$108
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.
Wed 10/143:20 pm -
1 stop6h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Southwest logo]()
$114
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.
Tue 10/136:00 am -
1 stop29h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$114
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/297:50 pm -
1 stop16h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$117
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.
Tue 12/1512:28 pm -
1 stop22h 52m
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.
Tue 12/157:32 pm -
1 stop15h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$118
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/166:16 am -
1 stop5h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$119
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 September 19, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $227 (American Airlines) |
One-way from | $77 (Kiwi.com) |
Popular in | February |
Cheapest in | October |
Average price | $347 |
Good round-trip deal | $298 or less |
Good one-way deal | $195 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 7,457,451 searches. Data last updated September 19, 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
St. LouisBuffalo
STL Lambert-St Louis - BUF Buffalo
STLBUF
Lambert-St Louis
Fri 10/23
6:35 pm-12:59 pm
1 stop17h 24m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$77
St. LouisBuffalo
STL Lambert-St Louis - BUF Buffalo
STLBUF
Lambert-St Louis
Wed 10/14
3:20 pm-10:25 pm
1 stop6h 05m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$114
Quickest round-trip
ChicagoBuffalo
MDW Chicago Midway - BUF Buffalo
MDWBUF
Chicago Midway
Sat 10/17
8:00 am-10:30 am
Nonstop1h 30m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$126
ChicagoBuffalo
MDW Chicago Midway - BUF Buffalo
MDWBUF
Chicago Midway
Tue 10/13
6:44 pm-11:59 pm
1 stop4h 15m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$136
ChicagoBuffalo
MDW Chicago Midway - BUF Buffalo
MDWBUF
Chicago Midway
Wed 12/16
9:37 am-3:19 pm
1 stop4h 42m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$136
ChicagoBuffalo
MDW Chicago Midway - BUF Buffalo
MDWBUF
Chicago Midway
Sat 11/14
7:35 am-1:30 pm
1 stop4h 55m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$136
ChicagoBuffalo
MDW Chicago Midway - BUF Buffalo
MDWBUF
Chicago Midway
Sat 12/12
9:37 am-3:25 pm
1 stop4h 48m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$136
ChicagoBuffalo
ORD Chicago O'Hare Intl - BUF Buffalo
ORDBUF
Chicago O'Hare Intl
Sat 12/12
7:00 am-1:24 pm
1 stop5h 24m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$136
ChicagoBuffalo
ORD Chicago O'Hare Intl - BUF Buffalo
ORDBUF
Chicago O'Hare Intl
Wed 12/16
6:00 am-2:37 pm
1 stop7h 37m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$136
ChicagoBuffalo
ORD Chicago O'Hare Intl - BUF Buffalo
ORDBUF
Chicago O'Hare Intl
Thu 10/29
5:51 pm-8:36 pm
Nonstop1h 45m
Buffalo
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$144
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.
STL-BUF
MDW-BUF
ORD-BUF
PIA-BUF
MLI-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
STL-BUF
MDW-BUF
ORD-BUF
PIA-BUF
What is the cheapest month to book a flight from Illinois to Buffalo?
Currently, January is the cheapest month in which you can book a flight from Illinois to Buffalo (average of $342). Flying from Illinois to Buffalo in March is currently the most expensive (average of $451). 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 September 19, 2026.
A simple way to save on the total cost of your ticket is to fly from Illinois to Buffalo in the afternoon. If you’re flexible enough to do this you can expect to save up to 11% on your trip compared to booking a flight in the evening.
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 September 19, 2026.
The most flights from USIL to BUF are scheduled on a Friday (32 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (13 on average).
How much does it cost to fly round-trip from Illinois to Buffalo?
Airfare is below average for this route at the moment.
Illinois to Buffalo flights typically cost between $296 and $466 in October.The cheapest round-trip price found within the last 5 days was $246 on Frontier (Oct 23-Oct 26).
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 33 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
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 September 12, 2026.
Travelers seeking maximum savings on their Illinois to Buffalo flight should consider departing on Sunday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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 locationsCheektowaga
Lockport
Amherst
Williamsville
Orchard Park
Eden
Bowmansville
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
Flights by cabin class
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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 September 19, 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 September 19, 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 4 airlines flying from Illinois to Buffalo
Discover the top 4 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 7,457,451 searches. Data last updated September 19, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$98 | Average$254 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$432 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$240 | Average$376 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$281 | Average$414 | FlexibilityNo cancel fee | On-time63% |