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Illinois

$70+ Cheap flights from Buffalo (BUF) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
fev 27 — mar 61
sex 2/27
sex 3/6
1 adult, Economy
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Cheap 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 janeiro 28, 2026.

This Frontier deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
sáb 2/2812:00 pm
BUF
-
MDW
1 stop10h 39m
Frontier
seg 3/29:22 pm
MDW
-
BUF
1 stop19h 59m
Frontier
Deal found 1/26$147
This Frontier deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 2/2311:17 am
BUF
-
MDW
1 stop10h 10m
Frontier
qui 2/266:25 am
MDW
-
BUF
1 stop5h 29m
Frontier
Deal found 1/27$148
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sex 2/201:29 pm
BUF
-
STL
1 stop18h 22m
Frontier
sex 2/278:22 pm
STL
-
BUF
1 stop13h 43m
Frontier
Deal found 1/27$151
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 2/2311:17 am
BUF
-
ORD
1 stop29h 35m
Frontier
qui 2/264:42 pm
ORD
-
BUF
1 stop19h 02m
Frontier
Deal found 1/27$158
This Priceline deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
seg 2/91:39 pm
BUF
-
MDW
1 stop9h 40m
Frontier
qui 2/126:25 am
MDW
-
BUF
1 stop5h 29m
Frontier
Deal found 1/26$160
This Kiwi.com deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
qui 2/51:39 pm
BUF
-
ORD
1 stop10h 07m
Frontier
sex 2/65:40 am
ORD
-
BUF
1 stop6h 04m
Frontier
Deal found 1/26$160
This Kiwi.com deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
sex 2/271:39 pm
BUF
-
ORD
1 stop10h 00m
Frontier
dom 3/15:05 am
ORD
-
BUF
1 stop7h 19m
Frontier
Deal found 1/26$163
This SmartFares deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 3/26:00 am
BUF
-
ORD
1 stop6h 49m
JetBlue
sex 3/612:41 pm
ORD
-
BUF
1 stop4h 54m
JetBlue
Deal found 1/26$166
This Kiwi.com deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” 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.
sex 2/61:39 pm
BUF
-
ORD
1 stop10h 07m
Frontier
dom 2/82:42 pm
ORD
-
BUF
1 stop21h 02m
Frontier
Deal found 1/26$169
This JetBlue deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 3/186:00 am
BUF
-
ORD
1 stop6h 25m
JetBlue
qua 3/2512:20 pm
ORD
-
BUF
1 stop7h 33m
JetBlue
Deal found 1/27$171
This Priceline deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 2/261:39 pm
BUF
-
ORD
1 stop10h 00m
Frontier
qui 3/55:05 am
ORD
-
BUF
1 stop6h 49m
Frontier
Deal found 1/28$173
This CheapOair deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” 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.
sáb 2/214:37 pm
BUF
-
STL
1 stop8h 22m
Frontier
sáb 2/283:49 pm
STL
-
BUF
1 stop17h 03m
Frontier
Deal found 1/25$176

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 janeiro 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$147
(Frontier)

One-way from

$70
(Priceline)

Popular in

February

Cheapest in

August

Average price

$346

Good round-trip deal

$317 or less

Good one-way deal

$183 or less
Provider with most accurate pricing for Buffalo-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Buffalo-Chicago (CHI) flights.
Search Deals
From Buffalo to Illinois
Search Deals
One-way flight from Buffalo to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Buffalo to Illinois.
Search Deals
Price to beat on a one-way flight from Buffalo to Illinois.
Search Deals

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 janeiro 28, 2026.
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

seg 2/23

11:17 am-8:27 pm

1 stop10h 10m

Chicago Midway

qui 2/26

6:25 am-12:54 pm

1 stop5h 29m

$148

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

qua 3/18

6:00 am-11:25 am

1 stop6h 25m

Chicago O'Hare Intl

qua 3/25

12:20 pm-8:53 pm

1 stop7h 33m

$171

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

sáb 2/21

4:37 pm-11:59 pm

1 stop8h 22m

Lambert-St Louis

sáb 2/28

3:49 pm-9:52 am

1 stop17h 03m

$176

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

ter 3/3

6:00 am-11:49 am

1 stop6h 49m

Chicago O'Hare Intl

qua 3/4

12:59 pm-6:46 pm

1 stop4h 47m

$185

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

seg 2/23

11:17 am-11:15 pm

1 stop12h 58m

Chicago O'Hare Intl

qui 2/26

5:05 am-12:54 pm

1 stop6h 49m

$217

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

qui 2/26

1:39 pm-12:40 am

2 stops12h 01m

Chicago O'Hare Intl

qui 3/5

5:05 am-12:54 pm

1 stop6h 49m

$220

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

seg 2/23

3:05 pm-11:26 pm

1 stop9h 21m

Chicago O'Hare Intl

qui 2/26

12:44 pm-6:35 pm

1 stop4h 51m

$239

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

seg 4/20

1:08 pm-10:39 pm

1 stop10h 31m

Chicago O'Hare Intl

qua 4/22

5:01 am-12:13 pm

1 stop6h 12m

$250

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

qui 2/12

1:39 pm-10:39 pm

1 stop10h 00m

Chicago O'Hare Intl

seg 2/16

5:05 am-1:06 pm

1 stop7h 01m

$250

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

ter 3/3

3:45 pm-7:00 pm

1 stop4h 15m

Chicago Midway

qua 3/4

1:50 pm-4:15 pm

Nonstop1h 25m

$267

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

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, July is the cheapest month in which you can book a flight from Buffalo to Illinois (average of $77). Flying from Buffalo to Illinois in December is currently the most expensive (average of $259). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BUF to IL?

Find hourly flight availability from Buffalo to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated janeiro 28, 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 36% on flights from Buffalo to Illinois by exploring options for tickets in the evening.

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 January 24, 2026.

Travelers seeking maximum savings on their Buffalo to Illinois flight should consider departing on Monday 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.

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 janeiro 28, 2026.

The most flights from BUF to USIL are scheduled on a Monday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 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 janeiro 28, 2026.
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
4,268 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,268 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,208 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,201 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.7
Fair
3,056 reviews
Southwest
8.0
Very good
4,268 reviews

Boarding

8.1

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 $267, Frontier can have you in Illinois from Buffalo in 4h 15m. 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 cheapest airlines to fly from Buffalo to Illinois one-way?

    For one-way options, check prices for American Airlines. According to our data, you can fly for as low as $77. Users have also found prices from $78 and $88 on Frontier and United Airlines, respectively.

  • 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 GoJet (89%), Copa Airlines (83%) or American Airlines (80%) 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 $118. On average you can expect to pay $707. The most popular route, (Buffalo - Chicago O'Hare Intl), can usually be booked for $163.

  • 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, July is the cheapest month in which you can book a flight from Buffalo to Illinois (average of $77). Flying from Buffalo to Illinois in December is currently the most expensive (average of $259). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Buffalo to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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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 janeiro 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$92Average$200FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$145Average$339FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$157Average$324FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$237Average$333FlexibilityNo cancel feeOn-time63%

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