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$73+ Cheap flights from Illinois to Buffalo (BUF)

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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BUF
Sep 1 — Sep 81
Tue 9/1
Tue 9/8
1 adult, Economy
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Cheap flight deals from Illinois to Buffalo

Cheapest flights from Illinois to Buffalo
Explore the most affordable flight options available from Illinois to Buffalo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 2, 2026.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:17 pm
STL
-
BUF
1 stop15h 12m
Frontier
Mon 8/2411:36 am
BUF
-
STL
1 stop6h 46m
Frontier
Deal found 7/29$141
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:35 am
STL
-
BUF
1 stop24h 43m
Frontier
Sun 10/181:13 pm
BUF
-
STL
1 stop21h 27m
Frontier
Deal found 7/29$143
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1210:35 am
STL
-
BUF
1 stop24h 43m
Frontier
Sun 10/181:13 pm
BUF
-
STL
1 stop21h 27m
Frontier
Deal found 7/29$144
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2910:35 am
STL
-
BUF
1 stop24h 43m
Frontier
Sun 11/11:13 pm
BUF
-
STL
1 stop21h 27m
Frontier
Deal found 7/31$147
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1210:35 am
STL
-
BUF
1 stop24h 43m
Frontier
Sat 10/171:13 pm
BUF
-
STL
1 stop21h 27m
Frontier
Deal found 7/29$149
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Mon 10/1910:35 am
STL
-
BUF
1 stop24h 43m
Frontier
Sat 10/241:13 pm
BUF
-
STL
1 stop21h 27m
Frontier
Deal found 8/1$150
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:17 pm
STL
-
BUF
1 stop15h 12m
Frontier
Thu 9/311:36 am
BUF
-
STL
1 stop6h 46m
Frontier
Deal found 7/30$151
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1510:35 am
STL
-
BUF
1 stop24h 43m
Frontier
Mon 10/191:13 pm
BUF
-
STL
1 stop21h 27m
Frontier
Deal found 7/30$153
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1210:35 am
STL
-
BUF
1 stop24h 43m
Frontier
Mon 10/191:13 pm
BUF
-
STL
1 stop21h 27m
Frontier
Deal found 7/29$154
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:17 pm
STL
-
BUF
1 stop15h 12m
Frontier
Thu 8/277:20 pm
BUF
-
STL
1 stop23h 02m
Frontier
Deal found 7/29$155
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/126:25 am
MDW
-
BUF
1 stop5h 25m
Frontier
Mon 9/141:40 pm
BUF
-
MDW
1 stop11h 04m
Frontier
Deal found 7/30$158
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/126:20 am
ORD
-
BUF
1 stop5h 30m
Frontier
Sat 9/191:40 pm
BUF
-
ORD
1 stop5h 43m
Frontier
Deal found 7/30$158

Find flight deals from Illinois to Buffalo

Keep the following information in mind while searching for Illinois to Buffalo flight deals. Data was last updated August 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$141
(Kiwi.com)

One-way from

$73
(Trip.com)

Popular in

February

Cheapest in

October

Average price

$405

Good round-trip deal

$305 or less

Good one-way deal

$153 or less
Provider with most accurate pricing for Chicago (CHI)-Buffalo flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Buffalo flights.
Search Deals
From Illinois to Buffalo
Search Deals
One-way flight from Illinois to Buffalo
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($77 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Illinois to Buffalo.
Search Deals
Price to beat on a one-way flight from Illinois to Buffalo.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Buffalo 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 August 2, 2026.
Use the filters below to find and compare flights from Illinois to Buffalo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoBuffalo

ORD - BUF

ORDBUF

Chicago O'Hare Intl

Thu 9/3

9:35 am-6:59 pm

1 stop8h 24m

Buffalo

Tue 9/8

9:15 am-5:29 pm

1 stop9h 14m

$231

ChicagoBuffalo

ORD - BUF

ORDBUF

Chicago O'Hare Intl

Tue 8/25

6:00 am-2:59 pm

1 stop7h 59m

Buffalo

Wed 8/26

3:55 pm-9:58 pm

1 stop7h 03m

$231
Quickest round-trip

ChicagoBuffalo

MDW - BUF

MDWBUF

Chicago Midway

Sat 9/12

7:40 am-10:10 am

Nonstop1h 30m

Buffalo

Sat 9/19

7:50 am-8:25 am

Nonstop1h 35m

$237

ChicagoBuffalo

ORD - BUF

ORDBUF

Chicago O'Hare Intl

Thu 8/20

11:01 am-6:15 pm

1 stop6h 14m

Buffalo

Mon 8/24

9:17 am-4:17 pm

1 stop8h 00m

$242

ChicagoBuffalo

MDW - BUF

MDWBUF

Chicago Midway

Thu 8/27

3:15 pm-10:15 pm

1 stop6h 00m

Buffalo

Thu 9/3

11:45 am-12:20 pm

Nonstop1h 35m

$247

ChicagoBuffalo

MDW - BUF

MDWBUF

Chicago Midway

Tue 8/25

12:45 pm-3:15 pm

Nonstop1h 30m

Buffalo

Tue 9/1

12:00 pm-3:50 pm

1 stop4h 50m

$247

ChicagoBuffalo

ORD - BUF

ORDBUF

Chicago O'Hare Intl

Thu 10/29

2:15 pm-8:24 pm

1 stop5h 09m

Buffalo

Sun 11/1

7:00 am-1:20 pm

1 stop7h 20m

$249

ChicagoBuffalo

MDW - BUF

MDWBUF

Chicago Midway

Thu 8/20

9:24 am-3:14 pm

1 stop4h 50m

Buffalo

Wed 8/26

6:27 am-9:17 am

1 stop3h 50m

$257

ChicagoBuffalo

MDW - BUF

MDWBUF

Chicago Midway

Thu 8/20

3:15 pm-10:15 pm

1 stop6h 00m

Buffalo

Mon 8/24

4:35 pm-10:40 pm

1 stop7h 05m

$257

ChicagoBuffalo

ORD - BUF

ORDBUF

Chicago O'Hare Intl

Sun 9/13

7:00 am-3:37 pm

1 stop7h 37m

Buffalo

Sun 9/20

6:00 am-9:58 am

1 stop4h 58m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Illinois to Buffalo

Have a flexible travel schedule? Discover the best time to fly to Buffalo from Illinois 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 Illinois to Buffalo

What is the cheapest month to book a flight from Illinois to Buffalo?

Currently, September is the cheapest month in which you can book a flight from Illinois to Buffalo (average of $293). Flying from Illinois to Buffalo in March is currently the most expensive (average of $451). 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 IL to BUF?

Find hourly flight availability from Illinois to Buffalo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 2, 2026.

A simple way to save on the total cost of your ticket is to fly from Illinois to Buffalo in the morning. If you’re flexible enough to do this you can expect to save up to 6% on your trip compared to booking a flight at noon.

Weekly flight availability from Illinois to Buffalo

Explore weekly flight availability from Illinois to Buffalo. 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 August 2, 2026.

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

How much does it cost to fly round-trip from Illinois to Buffalo?

Airfare is below average for this route at the moment.
Illinois to Buffalo flights typically cost between $264 and $568 in September.
The cheapest round-trip price found within the last 5 days was $158 on Frontier (Sep 12-Sep 19).

How far ahead should I book a flight from Illinois to Buffalo?

The price you pay for your flight from Illinois to Buffalo may vary depending on when you book. For the best chance of a lower fare, look to book 39 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest day to fly from Illinois to Buffalo?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Buffalo. Price data was last updated on August 1, 2026.

Travelers seeking maximum savings on their Illinois to Buffalo flight should consider departing on Sunday evenings when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Buffalo. 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 into for flights to Buffalo from Illinois?

    If you book a flight to Buffalo from Illinois, you will be flying to Buffalo, which is the city’s only airport. Buffalo (BUF) is located 8.3 mi from the center of Buffalo.

  • How long is the flight from Illinois to Buffalo?

    A quick flight from Illinois to Buffalo can take about 1h 30m. JetBlue provides one of the quickest options available for as low as $237. There are 466 mi between Illinois and Buffalo. Both multi-stop and nonstop flights can be found to your destination and back.

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

    One-way options have recently been found by users for as low as $82 on JetBlue. Other airlines that offer cheap prices include Frontier from $84 and American Airlines from $101 one-way.

  • What are the most popular routes from Illinois to Buffalo?

    The most popular flight routes from Illinois to Buffalo are Chicago O'Hare Intl - Buffalo, Chicago Midway - Buffalo and Lambert-St Louis - Buffalo.

  • What are the most reliable airlines from Illinois to Buffalo?

    Before booking your flight to Buffalo from Illinois, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (83%), United Airlines (79%), GoJet( 78%).

  • What are the cheapest flights from Illinois to Buffalo?

    While on average a flight from Illinois to Buffalo is generally $322, our data shows the cheapest flight currently is $118. When looking at the most popular route, (Chicago O'Hare Intl - Buffalo), you can expect to pay $208 for that flight.

  • Can I find deals for flights from Illinois to Buffalo that include hotel bookings?

    Yes. In addition to deals on Illinois to Buffalo flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Buffalo?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Buffalo.

  • Can I find deals for business class flights from Illinois to Buffalo?

    Yes. Cheapflights offers flight deals from Illinois to Buffalo 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 Illinois to Buffalo?

    Currently, September is the cheapest month in which you can book a flight from Illinois to Buffalo (average of $293). Flying from Illinois to Buffalo in March is currently the most expensive (average of $451). 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

Traveling to a place near Buffalo?

Book flights to Buffalo if you plan to visit one of these locations
Lockport
Cheektowaga
Amherst
Williamsville
Orchard Park
Eden
Bowmansville

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Alternative routes for Illinois to Buffalo

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Illinois to Buffalo

Discover the top 4 airlines that operate flights from Illinois to Buffalo. 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 August 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$98Average$254FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$199Average$353FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$208Average$359FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$281Average$445FlexibilityNo cancel feeOn-time63%

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