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$98+ 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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.
BUF — ORD
Mar 26 — Apr 21
Wed 3/26
Wed 4/2
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 March 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$199
(United Airlines)

One-way from

$98
(Mytrip)

Popular in

February

Cheapest in

September

Average price

$349

Good round-trip deal

$351 or less

Good one-way deal

$174 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. 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 March 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 March 21, 2025.

This United Airlines deal was found by Cheapflights users on 3/20. 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.
Sun 4/207:00 amBUF - MLI
1 stop4h 12mUnited Airlines
Sat 4/2610:50 amMLI - BUF
1 stop5h 05mUnited Airlines
Deal found 3/20$199
This CheapOair deal was found by Cheapflights users on 3/21. 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.
Tue 4/111:24 amBUF - STL
1 stop13h 22mFrontier
Sat 4/54:57 pmSTL - BUF
1 stop16h 27mFrontier
Deal found 3/21$242
This Booking.com deal was found by Cheapflights users on 3/20. 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.
Thu 3/2711:24 amBUF - ORD
1 stop22h 31mFrontier
Thu 4/39:20 amORD - BUF
1 stop24h 03mFrontier
Deal found 3/20$269
This Frontier deal was found by Cheapflights users on 3/20. 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 7/173:54 pmBUF - MDW
1 stop8h 27mFrontier
Sat 7/196:00 amMDW - BUF
1 stop7h 46mFrontier
Deal found 3/20$270
This Southwest deal was found by Cheapflights users on 3/20. 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 4/107:30 pmBUF - MDW
Nonstop1h 35mSouthwest
Mon 4/141:10 pmMDW - BUF
Nonstop1h 25mSouthwest
Deal found 3/20$279
This American Airlines deal was found by Cheapflights users on 3/21. 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 4/242:58 pmBUF - ORD
Nonstop1h 57mAmerican Airlines
Mon 4/287:03 amORD - BUF
Nonstop1h 35mAmerican Airlines
Deal found 3/21$279
This JetBlue Airways deal was found by Cheapflights users on 3/21. 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 Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/87:05 amBUF - ORD
1 stop6h 21mJetBlue
Fri 4/1110:42 amORD - BUF
1 stop6h 35mJetBlue
Deal found 3/21$280
This Delta deal was found by Cheapflights users on 3/20. 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 4/56:00 amBUF - ORD
1 stop14h 25mDelta
Tue 4/86:00 amORD - BUF
1 stop11h 00mDelta
Deal found 3/20$283
This Delta deal was found by Cheapflights users on 3/19. 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 5/105:54 pmBUF - STL
1 stop4h 37mDelta
Mon 5/125:40 pmSTL - BUF
1 stop5h 13mDelta
Deal found 3/19$287
This United Airlines deal was found by Cheapflights users on 3/21. 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.
Tue 5/276:15 amBUF - ORD
1 stop4h 23mUnited Airlines
Mon 6/26:20 pmORD - BUF
Nonstop1h 41mUnited Airlines
Deal found 3/21$289
This United Airlines deal was found by Cheapflights users on 3/20. 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 5/36:00 amBUF - STL
1 stop6h 08mUnited Airlines
Sat 5/109:40 amSTL - BUF
2 stops8h 12mUnited Airlines
Deal found 3/20$292
This Delta deal was found by Cheapflights users on 3/20. 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 4/106:22 amBUF - MDW
1 stop3h 21mDelta
Mon 4/144:59 pmMDW - BUF
1 stop5h 58mDelta
Deal found 3/20$299

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 March 21, 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

BuffaloMoline

BUF - MLI

BUFMLI

Buffalo

Sun 4/20

7:00 am-10:12 am

1 stop4h 12m

Moline Quad-City

Sat 4/26

10:50 am-4:55 pm

1 stop5h 05m

$199

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Tue 4/1

11:24 am-11:46 pm

1 stop13h 22m

Lambert-St Louis

Sat 4/5

4:57 pm-10:24 am

1 stop16h 27m

$242

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Thu 7/17

3:54 pm-11:21 pm

1 stop8h 27m

Chicago Midway

Sat 7/19

6:00 am-2:46 pm

1 stop7h 46m

$270

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 7/17

3:54 pm-12:22 am

1 stop9h 28m

Chicago O'Hare Intl

Sat 7/19

5:10 am-2:46 pm

1 stop8h 36m

$270

BuffaloChicago

BUF - MDW

BUFMDW

Buffalo

Thu 4/10

7:30 pm-8:05 pm

Nonstop1h 35m

Chicago Midway

Mon 4/14

6:50 pm-9:15 pm

Nonstop1h 25m

$279

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Thu 4/24

2:58 pm-3:55 pm

Nonstop1h 57m

Chicago O'Hare Intl

Mon 4/28

7:03 am-9:38 am

Nonstop1h 35m

$279

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Tue 4/8

7:05 am-12:26 pm

1 stop6h 21m

Chicago O'Hare Intl

Fri 4/11

10:42 am-6:17 pm

1 stop6h 35m

$280

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Sat 4/5

6:00 am-7:25 pm

1 stop14h 25m

Chicago O'Hare Intl

Tue 4/8

6:00 am-6:00 pm

1 stop11h 00m

$283

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Sat 5/10

5:54 pm-9:31 pm

1 stop4h 37m

Lambert-St Louis

Mon 5/12

5:40 pm-11:53 pm

1 stop5h 13m

$287

BuffaloChicago

BUF - ORD

BUFORD

Buffalo

Tue 5/27

6:15 am-9:38 am

1 stop4h 23m

Chicago O'Hare Intl

Mon 6/2

6:20 pm-9:01 pm

Nonstop1h 41m

$289

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/20

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 $326). 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 March 21, 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 March 21, 2025.

The most flights from BUF to USIL are scheduled on a Wednesday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 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 March 21, 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
8.1
Very good
4,281 reviews

Crew

8.7

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,281 reviews
Southwest
8.1
Very good
4,281 reviews

Crew

8.7

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,895 reviews
Southwest
8.1
Very good
4,281 reviews

Crew

8.7

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,605 reviews
Southwest
8.1
Very good
4,281 reviews

Crew

8.7

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
JetBlue
7.3
Good
2,937 reviews
Southwest
8.1
Very good
4,281 reviews

Crew

8.7

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,281 reviews

Crew

8.7

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 Frontier. According to our data, you can fly for as low as $98. Users have also found prices from $104 and $113 on JetBlue 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 Qatar Airways (95%), Avianca (91%) or Copa Airlines (88%) 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 $132. On average you can expect to pay $1,052. The most popular route, (Buffalo - Chicago O'Hare Intl), can usually be booked for $207.

  • 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 $326). 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 5 airlines flying from Buffalo to Illinois

Discover the top 5 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 March 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$95Average$193FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$152Average$410FlexibilityNo cancel feeOn-time69%
DeltaCheapest$156Average$378FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$172Average$333FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$266Average$327FlexibilityNo cancel feeOn-time63%
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