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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 8/30. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
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 July 31, 2025.

Round-trip from

$177
(Southwest)

One-way from

$89
(Southwest)

Popular in

February

Cheapest in

August

Average price

$349

Good round-trip deal

$235 or less

Good one-way deal

$163 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. 4% potential increase in price ($14 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 July 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 July 31, 2025.

This Southwest deal was found by Cheapflights users on 7/31. 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 8/216:10 amBUF - MDW
Nonstop1h 35mSouthwest
Mon 8/252:05 pmMDW - BUF
Nonstop1h 25mSouthwest
Deal found 7/31$177
This American Airlines deal was found by Cheapflights users on 7/31. 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 8/215:40 pmBUF - ORD
Nonstop2h 01mAmerican Airlines
Mon 8/258:24 amORD - BUF
Nonstop1h 40mAmerican Airlines
Deal found 7/31$177
This Frontier deal was found by Cheapflights users on 7/29. 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 8/231:56 pmBUF - ORD
1 stop10h 37mFrontier
Sat 8/307:46 pmORD - BUF
1 stop13h 31mFrontier
Deal found 7/29$178
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/276:20 amBUF - MDW
1 stop3h 15mDelta
Wed 9/36:17 pmMDW - BUF
1 stop3h 42mDelta
Deal found 7/31$197
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/272:19 pmBUF - ORD
1 stop5h 55mDelta
Tue 9/211:05 amORD - BUF
1 stop6h 02mDelta
Deal found 7/31$197
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/97:50 pmBUF - MDW
1 stop27h 34mFrontier
Sat 8/2310:51 amMDW - BUF
1 stop22h 26mFrontier
Deal found 7/28$205
This Trip.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/146:00 amBUF - ORD
1 stop7h 21mJetBlue
Tue 9/166:45 amORD - BUF
1 stop7h 12mJetBlue
Deal found 7/30$211
This United Airlines deal was found by Cheapflights users on 7/31. 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 8/235:54 pmBUF - ORD
Nonstop1h 56mUnited Airlines
Sun 8/317:10 amORD - BUF
Nonstop1h 43mUnited Airlines
Deal found 7/31$213
This FlightHub deal was found by Cheapflights users on 7/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/319:07 pmBUF - STL
1 stop27h 40mFrontier
Wed 8/135:40 pmSTL - BUF
1 stop14h 12mFrontier
Deal found 7/29$215
This Trip.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2110:55 amBUF - ORD
Nonstop1h 56mMultiple Airlines
Mon 8/256:00 amORD - BUF
1 stop9h 00mMultiple Airlines
Deal found 7/31$221
This American Airlines deal was found by Cheapflights users on 7/30. 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 9/122:35 pmBUF - STL
1 stop7h 35mAmerican Airlines
Mon 9/153:56 pmSTL - BUF
1 stop5h 08mAmerican Airlines
Deal found 7/30$237
This Southwest deal was found by Cheapflights users on 7/30. 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 9/67:10 amBUF - ORD
1 stop6h 55mSouthwest
Mon 9/82:55 pmORD - BUF
2 stops7h 10mSouthwest
Deal found 7/30$243

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 July 31, 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 8/21

6:10 am-6:45 am

Nonstop1h 35m

Chicago Midway

Mon 8/25

2:05 pm-4:30 pm

Nonstop1h 25m

$177

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 8/21

5:40 pm-6:41 pm

Nonstop2h 01m

Chicago O'Hare Intl

Mon 8/25

8:24 am-11:04 am

Nonstop1h 40m

$177

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Sat 8/23

1:56 pm-11:33 pm

1 stop10h 37m

Chicago O'Hare Intl

Sat 8/30

7:46 pm-10:17 am

1 stop13h 31m

$178

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Wed 8/27

6:20 am-8:35 am

1 stop3h 15m

Chicago Midway

Wed 9/3

6:17 pm-10:59 pm

1 stop3h 42m

$197

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Wed 8/27

2:19 pm-7:14 pm

1 stop5h 55m

Chicago O'Hare Intl

Tue 9/2

11:05 am-6:07 pm

1 stop6h 02m

$197

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Tue 1/20

12:45 pm-6:34 pm

1 stop6h 49m

Chicago O'Hare Intl

Tue 2/10

2:20 pm-9:31 pm

1 stop6h 11m

$202

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Wed 8/13

5:12 pm-8:54 pm

1 stop28h 42m

Chicago Midway

Sat 8/16

9:12 pm-8:52 am

1 stop10h 40m

$205

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Sat 8/23

5:54 pm-6:50 pm

Nonstop1h 56m

Chicago O'Hare Intl

Sun 8/31

7:10 am-9:53 am

Nonstop1h 43m

$213

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 8/21

10:55 am-11:51 am

Nonstop1h 56m

Chicago O'Hare Intl

Mon 8/25

6:00 am-4:00 pm

1 stop9h 00m

$221

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Fri 9/12

2:35 pm-9:10 pm

1 stop7h 35m

Lambert-St Louis

Mon 9/15

3:56 pm-10:04 pm

1 stop5h 08m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 32 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 July 31, 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 July 31, 2025.

The most flights from BUF to USIL are scheduled on a Thursday (31 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 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 July 31, 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 compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,981 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,900 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
JetBlue
7.3
Good
2,914 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Overall

8.0

Boarding

8.1

Food

7.0

Entertainment

7.5

Comfort

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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 Southwest. According to our data, you can fly for as low as $89. Users have also found prices from $89 and $90 on American Airlines and Frontier, 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 (97%), Avianca (90%) or United Airlines (89%) 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 $1,624. The most popular route, (Buffalo - Chicago O'Hare Intl), can usually be booked for $177.

  • 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$58Average$208FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$127Average$371FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$161Average$322FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$259Average$339FlexibilityNo cancel feeOn-time63%

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