$66 Find Cheap Flights from Buffalo to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Buffalo to Illinois departing on 5/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Buffalo to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Buffalo to Illinois, as well as popular online travel agencies
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Cheap Flights from Buffalo to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$238
Moline
Moline1 stop$329
St. Louis
St. Louis1 stop$191
Chicago
Chicago1 stop$238
Moline
Moline1 stop$329
St. Louis
St. Louis1 stop$191

Book Cheap Buffalo to Illinois Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Buffalo to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Buffalo to Illinois

Thu, Jun 4 - Sun, Jun 7
Frontier Logo
11:36 am - 5:33 pm
BUF
-
STL
6h 57m
1 stop
Frontier Logo
4:19 pm - 6:59 pm
STL
-
BUF
25h 40m
1 stop
$191Frontier
Thu, May 21 - Sat, May 23
Frontier Logo
11:36 am - 4:15 pm
BUF
-
STL
5h 39m
1 stop
Frontier Logo
5:27 pm - 8:04 pm
STL
-
BUF
25h 37m
2 stops
$206Frontier
Tue, Jun 9 - Wed, Jun 10
Multiple Airlines Logo
12:05 pm - 7:53 pm
BUF
-
ORD
8h 48m
1 stop
Multiple Airlines Logo
4:06 pm - 10:40 am
ORD
-
BUF
17h 34m
2 stops
$238Multiple Airlines
Tue, Jun 9 - Sat, Jun 13
Multiple Airlines Logo
12:05 pm - 7:53 pm
BUF
-
ORD
8h 48m
1 stop
Multiple Airlines Logo
1:18 pm - 10:40 am
ORD
-
BUF
20h 22m
2 stops
$243Multiple Airlines
Wed, May 13 - Sat, May 16
United Airlines Logo
11:02 am - 12:00 pm
BUF
-
ORD
1h 58mnonstop
United Airlines Logo
7:00 am - 9:42 am
ORD
-
BUF
1h 42mnonstop
$245United Airlines
Tue, May 19 - Tue, May 19
American Airlines Logo
6:00 am - 7:09 am
BUF
-
ORD
2h 09mnonstop
American Airlines Logo
3:15 pm - 9:20 pm
ORD
-
BUF
5h 05m
1 stop
$247American Airlines
Tue, Jun 9 - Tue, Jun 16
Southwest Logo
7:10 pm - 7:50 pm
BUF
-
MDW
1h 40mnonstop
Southwest Logo
8:10 am - 2:20 pm
MDW
-
BUF
5h 10m
1 stop
$247Southwest
Sat, May 16 - Tue, May 19
United Airlines Logo
7:00 am - 7:58 am
BUF
-
ORD
1h 58mnonstop
United Airlines Logo
7:00 am - 9:42 am
ORD
-
BUF
1h 42mnonstop
$251United Airlines
Tue, Jun 2 - Wed, Jun 3
Southwest Logo
9:25 am - 2:55 pm
BUF
-
MDW
6h 30m
2 stops
Southwest Logo
7:50 am - 10:20 am
MDW
-
BUF
1h 30mnonstop
$252Southwest
Wed, May 13 - Sun, May 17
American Airlines Logo
7:25 am - 6:10 pm
BUF
-
MLI
11h 45m
2 stops
American Airlines Logo
5:15 am - 10:51 am
MLI
-
BUF
4h 36m
1 stop
$424American Airlines
Booking Insights

KAYAK's insights & trends for Buffalo to Illinois flights

Get data-powered insights and trends into flights from Buffalo to Illinois to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Buffalo to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Buffalo to Illinois departing in June.

What is the cheapest Buffalo to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Buffalo found in the last 72 hours was to Chicago, at $269 round-trip. The most popular route is from Buffalo (BUF) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $269.

What is the cheapest time of day to fly to Illinois?

The average price for all round-trip flights from Buffalo to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $407 on average. Morning departures are around 4% cheaper than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $590.

Can I save money by flying with a layover from Buffalo to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $378 on average.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Buffalo to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Buffalo to Illinois is March, when tickets cost $73 (return) on average. On the other hand, the most expensive months are April and May, when the average cost of round-trip tickets is $200 and $168 respectively.

What’s the cheapest day of the week to fly from Buffalo to Illinois?

The average price of all round-trip flights from Buffalo to Illinois clicked on KAYAK for each day over the last 12 months.

When flying from Buffalo to Illinois, you should consider leaving on a Friday and avoid Sundays if you are looking for the best rates. For your return to Buffalo, you’ll find the best rates on Tuesdays and the most expensive ones on Thursdays.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Buffalo to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Buffalo to Illinois, you should book around 4 weeks before departure, which saves you about 52% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$66
Best time to beat the crowds but there is an average 9% increase in price.
Most popular time to fly and prices are also 23% lower on average.
Flight from Buffalo to St. Louis

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Buffalo to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Buffalo to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Buffalo to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Buffalo to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Buffalo to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Buffalo to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Buffalo to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Buffalo to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Buffalo to the following destinations at these prices or less: Chicago $180 one-way - $359 round-trip; Chicago $197 one-way - $379 round-trip

Reviews of the top 4 airlines serving from Buffalo to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Buffalo to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Buffalo to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4315 reviews
8.1Boarding
8.0Comfort
8.6Crew
7.5Entertainment
7.0Food
Airline reviews

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

10.0 Excellentlarry, Apr 2026
LGB - PHX
Read more Southwest reviews

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

no service at all due to turbulence. they should've at least given us snacks, there were only 10 people on the entire flight.

First time I've had to use the disabled accommodations. And I could not have had a better experience with Southwest, i was having trouble getting from one terminal to another due to my heart failure. And the next thing I know a Southwest agent had made sure. I had a wheelchair at all my flights. Can't thank them enough.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

We waited in the airplane for over 45 min for a southwest employee to make the flight. This cause over half the plane to miss their connecting flight in Denver. When we confronted the desk upon arrival, they told us the only flight they had was the next day leaving at 8:50 pm!!! Or they offered to get us to Burbank or LA, but after that we were on our own to get back to Santa Barbara. I paid for a flight from sba to bna bna to sba. My re entry into mom mode has been 💯 rough because of southwest mistake with my flight. And now I’m leaving to Reno tomorrow for a vballl tournament and just discovered that my leg in Vegas has me and my 3 kids on a stand by flight even though I had booked these ticket last year November!! Do better southwest!

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

For the first time in a long time, the Wi-Fi actually worked the entire flight! The flight crew was amazing as usual.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

boarded early to only find out that flight would sit at gate for 45 min to an hour. Landed in chicago and sat on runway for over an hour before got to gate. Total delay was extensive for a 45 min flight door to door.

The flight was significantly delayed. The inbound flight from EWR was delayed departing because of mechanical problems. My original departure from CLT was 5:28 pm but due to the delay of the inbound flight, after arrival, deplaning, cleaning, boarding, we did not push back from the gate until 9:00 pm. Once in the air, the flight was smooth and what was originally supposed to be an arrival in ORD at 7:30 pm local time turned out to be 9:35 pm.

The flight I was supposed to be on was supposed to take off at 1:50 from State College. It was delayed over and over and over again until somehow I had to rebook on a flight that was supposed to have left State College at 8 am that morning but didn't end up taking off until almost 6 pm. Not only was this completely unacceptable, the "token from United" was a 15 dollar meal voucher that has to be used by today. I would personally like some miles added to my account for this inconvenience. I was in transit for 8 hours from the time I arrive at State College Aiport to when I got home. I was supposed to be home at 3 pm and I returned at 8 pm. Unacceptable. I have not been on an on Time united flight in nearly 5 years.

newer aircraft, ability to connect my headset via blue tooth for entertainment.

Very comfortable flight, snacks and drinks were good, good communication from crew. Could have used a little more information on timing of boarding for group 5

Great flight. Got to watch a movie. Smooth flight and early arrival at ORD.

It was better than excellent. The staff in Mason City were great. The young woman that pushed my wheelchair did more than could be expected of her. She came from India 17 years ago. I don't remember her name.

After arriving in Chicago, we were taxiing for 1.5 hours with infrequent and untruthful updates about the amount of time it would take to arrive at the gate. Minimally, the team could have provided timing expectations that were more truthful, especially one their original expectations were not met.

It was good, the staff was great, and the food, was as usual, tea and biscuit. Bathroom was clean, and the plane was clean as well.

Very good I can’t complain one bit. Thank you American Airlines for making my flight enjoyable and safe!

The staff and service on American Airlines were truly outstanding. I had requested wheelchair assistance for my mother due to her knee issues, and the team went above and beyond every step of the way—from boarding in Boston to our arrival in Chicago. Their care, professionalism, and attentiveness made the entire experience smooth and stress-free. I’m very grateful for the support they provided.

The new planes (American Eagle) are beautiful and especially comfortable. The flight attendants are consistently professional and courteous. And, while it may seem inconsequential, the new liquid tube of coffee creamer—in contrast to the powdered coffee creamer—makes all the difference in a cup of coffee.

Boarding was quick and efficient. We arrived at our destination early.

I'm not sure American is capable of on-time arrivals and departures. When you land at ORD, you almost always get held on the tarmac because your gate is still occupied. I may have missed my connection, but that ended up up being significantly delayed as well. Once again, I finally got home well after midnight.

Crew at the gate was very crabby and not at all polite. The plane was very hot the entire flight. And the seat cushion was very worn out.

The staff are very, very professional. It's what flying should feel like.

Flight was delayed half hour before boarding, but when I checked flight aware the plane that would Pick us up had a delay of more than an hour. AA should let us know in advance to avoid waiting several hours in the airport

Delays with no explanation. It could have been handled better.

Plane was hot and miserable and the crew was rude!

12 hour delay required getting on and off plane 3 times - would have at least liked to have been offered a snack or drink

They didn’t offer a water, even after I asked

They switched our terminal 3 times and we were delayed for four plus hours!!!

It was an early flight and most people napped/slept and the crew let us which was nice.

The crew acted like they had never done this and kept barking passive aggressive orders at people. + the security line + the delay + sitting on the tarmac for 2 hours + none of the apps or signage updating with correct times

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Everything you need to know for your flight from Buffalo to Illinois

Information on your arrival and departure airports