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$89+ 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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
1 adult, Economy
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Cheap 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 14, 2025.

Round-trip from

$166
(Frontier)

One-way from

$89
(Delta)

Popular in

February

Cheapest in

August

Average price

$284

Good round-trip deal

$269 or less

Good one-way deal

$167 or less
From Buffalo to Illinois
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One-way flight from Buffalo to Illinois
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Highest demand for flights based on searches. 5% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Buffalo to Illinois.
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Price to beat on a one-way flight from Buffalo to Illinois.
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Find flight deals from Buffalo to Illinois

Cheapest flights from Buffalo to Illinois
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 14, 2025.

This Frontier deal was found by Cheapflights users on 9/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/245:24 pmBUF - ORD
1 stop8h 35mFrontier
Sun 10/265:05 amORD - BUF
1 stop5h 14mFrontier
Deal found 9/12$166
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:24 pmBUF - MDW
1 stop8h 00mFrontier
Sat 10/118:35 amMDW - BUF
1 stop8h 22mFrontier
Deal found 9/14$170
This Priceline deal was found by Cheapflights users on 9/12. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:24 pmBUF - ORD
1 stop8h 35mFrontier
Sun 10/195:05 amORD - BUF
1 stop5h 14mFrontier
Deal found 9/12$175
This Priceline deal was found by Cheapflights users on 9/12. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:24 pmBUF - MDW
1 stop8h 00mFrontier
Sun 10/1912:09 pmMDW - BUF
1 stop7h 09mFrontier
Deal found 9/12$176
This Delta deal was found by Cheapflights users on 9/11. 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.
Thu 10/26:15 amBUF - MDW
1 stop3h 25mDelta
Mon 10/66:23 pmMDW - BUF
1 stop3h 29mDelta
Deal found 9/11$177
This Frontier deal was found by Cheapflights users on 9/13. 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.
Sat 10/181:02 pmBUF - ORD
1 stop11h 27mFrontier
Mon 10/205:05 amORD - BUF
1 stop5h 14mFrontier
Deal found 9/13$177
This Frontier deal was found by Cheapflights users on 9/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/212:17 pmBUF - ORD
1 stop12h 22mFrontier
Mon 10/66:10 amORD - BUF
1 stop8h 53mFrontier
Deal found 9/11$185
This Frontier deal was found by Cheapflights users on 9/13. 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.
Fri 9/194:57 pmBUF - ORD
1 stop8h 02mFrontier
Sun 9/216:00 amORD - BUF
1 stop9h 02mFrontier
Deal found 9/13$187
This Booking.com deal was found by Cheapflights users on 9/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2712:15 pmBUF - MDW
1 stop24h 23mFrontier
Mon 11/36:20 amMDW - BUF
1 stop6h 17mFrontier
Deal found 9/12$191
This American Airlines deal was found by Cheapflights users on 9/12. 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 10/166:14 amBUF - ORD
Nonstop1h 59mAmerican Airlines
Sat 10/188:01 amORD - BUF
Nonstop1h 41mAmerican Airlines
Deal found 9/12$193
This American Airlines deal was found by Cheapflights users on 9/12. 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 10/96:14 amBUF - ORD
Nonstop1h 59mAmerican Airlines
Sat 10/118:50 pmORD - BUF
Nonstop1h 45mAmerican Airlines
Deal found 9/12$194
This Frontier deal was found by Cheapflights users on 9/13. 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.
Thu 10/27:41 pmBUF - MDW
2 stops21h 19mFrontier
Mon 10/68:19 amMDW - BUF
1 stop8h 55mFrontier
Deal found 9/13$195

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 September 14, 2025.
Use the filters below to find and compare flights from Buffalo to Illinois that are best for you.

Fly from

Buffalo

Fly to

Illinois

Route

Depart

Return

Price

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Sun 11/2

2:42 pm-10:03 pm

1 stop8h 21m

Chicago Midway

Mon 11/3

6:20 am-1:37 pm

1 stop6h 17m

$176

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Thu 10/16

6:20 am-8:40 am

1 stop3h 20m

Chicago Midway

Sat 10/18

11:10 am-4:25 pm

1 stop4h 15m

$177

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Thu 10/2

6:15 am-8:40 am

1 stop3h 25m

Chicago Midway

Mon 10/6

6:23 pm-10:52 pm

1 stop3h 29m

$177

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 12/11

6:24 pm-12:01 am

1 stop6h 37m

Chicago O'Hare Intl

Sat 12/13

6:45 am-12:34 pm

1 stop4h 49m

$177

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Tue 10/21

10:00 am-6:18 pm

1 stop9h 18m

Chicago O'Hare Intl

Sat 10/25

10:08 am-5:03 pm

1 stop5h 55m

$195

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Fri 9/19

4:57 pm-11:59 pm

1 stop8h 02m

Chicago O'Hare Intl

Sun 9/21

6:00 am-4:02 pm

1 stop9h 02m

$197

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 10/9

12:15 pm-11:39 pm

1 stop12h 24m

Chicago O'Hare Intl

Sun 10/12

5:05 am-11:19 am

1 stop5h 14m

$197

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Tue 10/7

5:27 pm-6:28 pm

Nonstop2h 01m

Chicago O'Hare Intl

Fri 10/10

8:50 pm-11:35 pm

Nonstop1h 45m

$209

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Sun 9/28

12:17 pm-11:20 pm

1 stop12h 03m

Chicago Midway

Mon 9/29

8:19 am-6:14 pm

1 stop8h 55m

$216

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Mon 12/8

2:00 pm-7:05 pm

1 stop6h 05m

Chicago O'Hare Intl

Wed 12/10

11:30 am-6:39 pm

1 stop6h 09m

$231

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

Showing 1-10 of 60 results
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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.
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

What is the cheapest month to book a flight from Buffalo to Illinois?

Currently, August is the cheapest month in which you can book a flight from Buffalo to Illinois (average of $245). Flying from Buffalo to Illinois in March is currently the most expensive (average of $321). 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 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Buffalo to Illinois as you normally would.

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 14, 2025.

The most flights from BUF to USIL are scheduled on a Wednesday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (27 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 September 14, 2025.
Get a feel of what it's like to fly with Southwest, United Airlines, and American 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.
Southwest
8.0
Very good
4,245 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,245 reviews
Southwest
8.0
Very good
4,245 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,931 reviews
Southwest
8.0
Very good
4,245 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,245 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,173 reviews
Southwest
8.0
Very good
4,245 reviews

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • What airport do you fly from for flights from Buffalo to Illinois?

    Most people fly from Buffalo (BUF) if they book a flight from Buffalo to Illinois. Buffalo is conveniently located just 8.3 mi from Buffalo’s city center.

  • How long is the flight from Buffalo to Illinois?

    For as low as $177, Frontier can have you in Illinois from Buffalo in 3h 20m. The distance between Buffalo and Illinois is about 466 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Buffalo to Illinois?

    When deciding which route to take from Buffalo to Illinois consider Buffalo - Chicago O'Hare Intl, Buffalo - Chicago Midway or Buffalo - Lambert-St Louis as they are the most popular.

  • What are the most reliable airlines from Buffalo to Illinois?

    Consider Avianca (90%), Copa Airlines (89%) or ANA (83%) when booking your flight. These represent the most reliable airlines when flying from Buffalo to Illinois.

  • What are the cheapest flights from Buffalo to Illinois?

    The cheapest flight price from Buffalo to Illinois is $91. On average you can expect to pay $661. The most popular route, (Buffalo - Chicago O'Hare Intl), can usually be booked for $149.

  • Can I find deals for flights from Buffalo to Illinois that include hotel bookings?

    Yes. In addition to deals on Buffalo to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Buffalo to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Buffalo to Illinois.

  • Can I find deals for business class flights from Buffalo to Illinois?

    Yes. Cheapflights offers flight deals from Buffalo to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Buffalo to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Buffalo to Illinois (average of $245). Flying from Buffalo to Illinois in March is currently the most expensive (average of $321). 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.

See more FAQs

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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 September 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$200FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$157Average$371FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$161Average$327FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$259Average$347FlexibilityNo cancel feeOn-time63%

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