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$90+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$224
(Gotogate)

One-way from

$93
(JetBlue)

Popular in

February

Cheapest in

August

Average price

$312

Good round-trip deal

$339 or less

Good one-way deal

$139 or less
Provider with most accurate pricing for Buffalo-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Buffalo-Chicago (CHI) flights.
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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 May 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 May 1, 2025.

This Frontier deal was found by Cheapflights users on 4/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/311:38 amBUF - STL
1 stop13h 28mFrontier
Sat 5/105:45 pmSTL - BUF
1 stop14h 16mFrontier
Deal found 4/30$189
This Frontier deal was found by Cheapflights users on 4/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/153:51 pmBUF - ORD
1 stop8h 20mFrontier
Mon 5/196:55 amORD - BUF
1 stop11h 42mFrontier
Deal found 4/30$230
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/306:35 pmBUF - MLI
1 stop5h 22mDelta
Wed 6/45:15 pmMLI - BUF
1 stop5h 40mDelta
Deal found 4/30$233
This Frontier deal was found by Cheapflights users on 4/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/13:51 pmBUF - MDW
1 stop8h 48mFrontier
Sun 5/48:30 amMDW - BUF
1 stop5h 25mFrontier
Deal found 4/30$238
This JetBlue deal was found by Cheapflights users on 4/30. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2110:33 amBUF - ORD
1 stop5h 31mJetBlue
Tue 7/811:35 amORD - BUF
1 stop6h 55mJetBlue
Deal found 4/30$242
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/412:10 pmBUF - STL
1 stop7h 34mDelta
Sat 7/126:04 pmSTL - BUF
1 stop3h 19mDelta
Deal found 4/30$244
This American Airlines deal was found by Cheapflights users on 4/30. 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 7/46:00 amBUF - STL
2 stops6h 59mAmerican Airlines
Sat 7/125:14 pmSTL - BUF
1 stop4h 43mAmerican Airlines
Deal found 4/30$249
This Southwest deal was found by Cheapflights users on 4/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/257:25 amBUF - MDW
Nonstop1h 40mSouthwest
Tue 5/271:00 pmMDW - BUF
Nonstop1h 25mSouthwest
Deal found 4/29$249
This United Airlines deal was found by Cheapflights users on 4/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/285:51 pmBUF - ORD
Nonstop1h 56mUnited Airlines
Sat 5/312:10 pmORD - BUF
Nonstop1h 45mUnited Airlines
Deal found 4/30$249
This American Airlines deal was found by Cheapflights users on 4/30. 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.
Wed 5/216:01 amBUF - ORD
1 stop8h 34mAmerican Airlines
Tue 7/87:55 pmORD - BUF
Nonstop1h 54mAmerican Airlines
Deal found 4/30$256
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/216:00 amBUF - MDW
1 stop4h 40mDelta
Tue 7/810:26 amMDW - BUF
1 stop7h 14mDelta
Deal found 4/30$269
This Southwest deal was found by Cheapflights users on 4/30. 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.
Mon 6/27:30 pmBUF - STL
1 stop3h 30mSouthwest
Fri 6/64:35 pmSTL - BUF
2 stops6h 10mSouthwest
Deal found 4/30$274

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 May 1, 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

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Fri 5/16

9:51 am-12:14 am

1 stop15h 23m

Lambert-St Louis

Sun 5/18

5:45 pm-9:01 am

1 stop14h 16m

$224

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 5/15

3:51 pm-11:11 pm

1 stop8h 20m

Chicago O'Hare Intl

Mon 5/19

6:55 am-7:37 pm

1 stop11h 42m

$230

BuffaloMoline

BUF - MLI

BUFMLI

Buffalo

Fri 5/30

6:35 pm-10:57 pm

1 stop5h 22m

Moline Quad-City

Wed 6/4

5:15 pm-11:55 pm

1 stop5h 40m

$233

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Wed 5/21

10:33 am-3:04 pm

1 stop5h 31m

Chicago O'Hare Intl

Tue 7/8

11:35 am-7:30 pm

1 stop6h 55m

$242

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Fri 6/27

8:50 am-8:17 pm

1 stop12h 27m

Chicago Midway

Sun 6/29

9:12 pm-7:50 am

1 stop9h 38m

$242

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Fri 7/4

12:10 pm-6:44 pm

1 stop7h 34m

Lambert-St Louis

Sat 7/12

6:04 pm-10:23 pm

1 stop3h 19m

$244

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Fri 7/4

6:00 am-11:59 am

2 stops6h 59m

Lambert-St Louis

Sat 7/12

5:14 pm-10:57 pm

1 stop4h 43m

$249

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Sun 5/25

7:25 am-8:05 am

Nonstop1h 40m

Chicago Midway

Tue 5/27

1:00 pm-3:25 pm

Nonstop1h 25m

$249

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Wed 5/28

5:51 pm-6:47 pm

Nonstop1h 56m

Chicago O'Hare Intl

Sat 5/31

2:10 pm-4:55 pm

Nonstop1h 45m

$249

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Wed 5/21

6:01 am-1:35 pm

1 stop8h 34m

Chicago O'Hare Intl

Tue 7/8

7:55 pm-10:49 pm

Nonstop1h 54m

$256

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 33 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 May 1, 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 May 1, 2025.

The most flights from BUF to USIL are scheduled on a Wednesday (33 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 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 May 1, 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
4,294 reviews

Food

7.1

Comfort

8.0

Crew

8.6

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
Southwest
8.0
Very good
4,294 reviews
Southwest
8.0
Very good
4,294 reviews

Food

7.1

Comfort

8.0

Crew

8.6

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
Delta
8.0
Very good
7,934 reviews
Southwest
8.0
Very good
4,294 reviews

Food

7.1

Comfort

8.0

Crew

8.6

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
United Airlines
7.4
Good
8,696 reviews
Southwest
8.0
Very good
4,294 reviews

Food

7.1

Comfort

8.0

Crew

8.6

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
JetBlue
7.3
Good
2,924 reviews
Southwest
8.0
Very good
4,294 reviews

Food

7.1

Comfort

8.0

Crew

8.6

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,294 reviews

Food

7.1

Comfort

8.0

Crew

8.6

Entertainment

7.6

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Gina,Apr 2025

LAS - DEN

Good, the crew was friendly and helpful. The pilot had great skills in keeping the plane stable through rough turbulence. Smooth landing, too! Thank you!

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 $93. Users have also found prices from $94 and $123 on Frontier and Sun Country Air, 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 SkyWest Airlines (100%), Copa Airlines (100%) or Republic Airways (94%) 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 $125. On average you can expect to pay $684. The most popular route, (Buffalo - Chicago O'Hare Intl), can usually be booked for $193.

  • 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$95Average$184FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$151Average$411FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$180Average$327FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$266Average$339FlexibilityNo cancel feeOn-time63%

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