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$107+ 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 8/31. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$182
(Southwest)

One-way from

$107
(JetBlue)

Popular in

February

Cheapest in

August

Average price

$320

Good round-trip deal

$302 or less

Good one-way deal

$162 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. 3% potential increase in price ($12 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 June 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 June 12, 2025.

This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/284:50 pmBUF - MDW
Nonstop1h 35mSouthwest
Sun 8/319:00 amMDW - BUF
1 stop5h 25mSouthwest
Deal found 6/11$182
This United Airlines deal was found by Cheapflights users on 6/10. 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 8/187:00 amBUF - ORD
Nonstop1h 56mUnited Airlines
Thu 8/212:08 pmORD - BUF
Nonstop1h 44mUnited Airlines
Deal found 6/10$187
This Southwest deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/167:40 amBUF - ORD
1 stop5h 10mSouthwest
Thu 9/181:50 pmORD - BUF
1 stop8h 15mSouthwest
Deal found 6/11$188
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/166:01 amBUF - ORD
1 stop4h 46mAmerican Airlines
Thu 9/189:15 pmORD - BUF
Nonstop1h 38mAmerican Airlines
Deal found 6/11$197
This Delta deal was found by Cheapflights users on 6/9. 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 8/165:10 pmBUF - MDW
1 stop5h 02mDelta
Tue 8/196:17 pmMDW - BUF
1 stop3h 42mDelta
Deal found 6/9$198
This Delta deal was found by Cheapflights users on 6/10. 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 8/2812:45 pmBUF - ORD
1 stop4h 28mDelta
Sat 8/307:15 amORD - BUF
1 stop3h 12mDelta
Deal found 6/10$198
This JetBlue deal was found by Cheapflights users on 6/10. 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.
Tue 9/96:00 amBUF - ORD
1 stop7h 10mJetBlue
Fri 9/121:36 pmORD - BUF
1 stop7h 24mJetBlue
Deal found 6/10$205
This American Airlines deal was found by Cheapflights users on 6/10. 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 8/2611:34 amBUF - STL
1 stop8h 47mAmerican Airlines
Wed 8/277:23 amSTL - BUF
1 stop8h 40mAmerican Airlines
Deal found 6/10$213
This Sun Country Air deal was found by Cheapflights users on 6/10. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/311:23 amBUF - ORD
1 stop26h 28mSun Country Air
Sat 7/56:09 pmORD - BUF
1 stop15h 35mSun Country Air
Deal found 6/10$245
This Delta deal was found by Cheapflights users on 6/11. 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.
Fri 9/512:02 pmBUF - STL
1 stop5h 04mDelta
Mon 9/89:16 amSTL - BUF
1 stop6h 48mDelta
Deal found 6/11$251
This Southwest deal was found by Cheapflights users on 6/10. 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 8/264:05 pmBUF - STL
2 stops7h 00mSouthwest
Wed 8/271:45 pmSTL - BUF
1 stop5h 35mSouthwest
Deal found 6/10$256
This Frontier deal was found by Cheapflights users on 6/10. 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 8/294:55 pmBUF - MDW
1 stop8h 29mFrontier
Sun 8/3111:03 amMDW - BUF
1 stop7h 13mFrontier
Deal found 6/10$260

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 June 12, 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

Thu 8/28

4:50 pm-5:25 pm

Nonstop1h 35m

Chicago Midway

Sun 8/31

9:00 am-3:25 pm

1 stop5h 25m

$182

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Mon 8/18

7:00 am-7:56 am

Nonstop1h 56m

Chicago O'Hare Intl

Thu 8/21

2:08 pm-4:52 pm

Nonstop1h 44m

$187

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Tue 9/16

7:40 am-11:50 am

1 stop5h 10m

Chicago O'Hare Intl

Thu 9/18

1:50 pm-11:05 pm

1 stop8h 15m

$188

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Tue 9/16

6:01 am-9:47 am

1 stop4h 46m

Chicago O'Hare Intl

Thu 9/18

9:15 pm-11:53 pm

Nonstop1h 38m

$197

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 8/28

12:45 pm-4:13 pm

1 stop4h 28m

Chicago O'Hare Intl

Sat 8/30

7:15 am-11:27 am

1 stop3h 12m

$198

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Tue 9/9

6:00 am-12:10 pm

1 stop7h 10m

Chicago O'Hare Intl

Fri 9/12

1:36 pm-10:00 pm

1 stop7h 24m

$205

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Fri 8/22

3:58 pm-6:37 pm

1 stop3h 39m

Chicago Midway

Mon 8/25

6:17 pm-10:59 pm

1 stop3h 42m

$207

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Tue 8/26

11:34 am-7:21 pm

1 stop8h 47m

Lambert-St Louis

Wed 8/27

7:23 am-5:03 pm

1 stop8h 40m

$213

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 7/3

11:23 am-12:51 pm

1 stop26h 28m

Chicago O'Hare Intl

Sat 7/5

6:09 pm-10:44 am

1 stop15h 35m

$245

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Fri 9/5

12:02 pm-4:06 pm

1 stop5h 04m

Lambert-St Louis

Mon 9/8

9:16 am-5:04 pm

1 stop6h 48m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 41 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 June 12, 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 June 12, 2025.

The most flights from BUF to USIL are scheduled on a Monday (32 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 on average).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
Get a feel of what it's like to fly with Southwest, Delta and United Airlines from Buffalo to Illinois by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,287 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,946 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,790 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
JetBlue
7.3
Good
2,925 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,287 reviews

Food

7.1

Entertainment

7.6

Boarding

8.2

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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.

  • What are the cheapest airlines to fly from Buffalo to Illinois one-way?

    For one-way options, check prices for JetBlue. According to our data, you can fly for as low as $107. Users have also found prices from $109 and $109 on Southwest 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 Copa Airlines (96%), Avianca (93%) or Republic Airways (92%) 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 $108. On average you can expect to pay $1,482. The most popular route, (Buffalo - Chicago O'Hare Intl), can usually be booked for $127.

  • 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.

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$208FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$127Average$366FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$169Average$331FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$259Average$337FlexibilityNo cancel feeOn-time63%

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