ONT - BUF

$154 Find Cheap Flights from Ontario to Buffalo

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Buffalo departing on 11/5. 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

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Buffalo, 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 Ontario to Buffalo, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Buffalo (ONT-BUF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Buffalo 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 Ontario to Buffalo

Mon, Oct 20 - Mon, Oct 27
Frontier Logo
6:53 am - 4:29 pmONT-BUF
6h 36m1 stop
Frontier Logo
5:24 pm - 11:50 pmBUF-ONT
9h 26m1 stop
$242Frontier
Find Deal
Mon, Oct 20 - Fri, Oct 24
Frontier Logo
6:53 am - 4:29 pmONT-BUF
6h 36m1 stop
Frontier Logo
5:24 pm - 11:50 pmBUF-ONT
9h 26m1 stop
$246Frontier
Find Deal
Thu, Oct 23 - Mon, Oct 27
Frontier Logo
10:30 am - 4:29 pmONT-BUF
26h 59m1 stop
Frontier Logo
5:24 pm - 11:50 pmBUF-ONT
9h 26m1 stop
$287Frontier
Find Deal
Tue, Oct 21 - Sat, Oct 25
Delta Logo
7:05 am - 6:25 pmONT-BUF
8h 20m1 stop
Delta Logo
6:00 am - 10:26 amBUF-ONT
7h 26m1 stop
$307Delta
Find Deal
Tue, Oct 21 - Wed, Oct 29
Delta Logo
7:05 am - 10:57 pmONT-BUF
12h 52m2 stops
Delta Logo
6:00 am - 10:26 amBUF-ONT
7h 26m1 stop
$312Delta
Find Deal
Tue, Oct 14 - Sat, Oct 18
American Airlines Logo
11:59 pm - 12:24 pmONT-BUF
9h 25m2 stops
American Airlines Logo
6:00 am - 3:24 pmBUF-ONT
12h 24m2 stops
$361American Airlines
Find Deal
Tue, Oct 14 - Sat, Oct 18
United Airlines Logo
7:02 am - 4:53 pmONT-BUF
6h 51m1 stop
United Airlines Logo
8:25 am - 12:51 pmBUF-ONT
7h 26m1 stop
$367United Airlines
Find Deal
Sat, Oct 11 - Tue, Oct 14
American Airlines Logo
10:29 pm - 11:04 amONT-BUF
9h 35m1 stop
American Airlines Logo
4:25 pm - 9:36 pmBUF-ONT
8h 11m1 stop
$369American Airlines
Find Deal
Tue, Oct 14 - Sat, Oct 18
Southwest Logo
5:30 am - 3:20 pmONT-BUF
6h 50m1 stop
Southwest Logo
1:05 pm - 6:30 pmBUF-ONT
8h 25m1 stop
$402Southwest
Find Deal
Sat, Oct 11 - Sat, Oct 18
United Airlines Logo
1:15 pm - 10:46 pmONT-BUF
6h 31m1 stop
United Airlines Logo
8:25 am - 12:51 pmBUF-ONT
7h 26m1 stop
$407United Airlines
Find Deal

Everything you should know

Top airlines
Frontier
Cheapest • from $242 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
September
Cheapest • 31% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$242
Overall average: $436
Frontier
Mon 10/20Mon 10/27
ONT - BUF • 1 stop
Cheapest one-way
$154
Typical prices: $418-463
Delta
Wed 11/5
ONT - BUF • 1 stop
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Buffalo!
Booking Insights

KAYAK's insights & trends for Ontario to Buffalo flights

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

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

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

If your flying dates are flexible, you should consider flying to Buffalo on a Monday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Ontario to Buffalo. For your return ticket, we recommend flying on a Saturday and avoiding Sundays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Buffalo, 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 Ontario to Buffalo is September, where tickets cost $320 (return) on average. On the other hand, the most expensive months are November and December, where the average cost of round-trip tickets is $618 and $611 respectively.

Good to know

Low seasonMarch
Cheapest flight$154
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Ontario to Buffalo

When to book flights from Ontario to Buffalo

Are your dates flexible? Find out the best times to travel from Ontario to Buffalo based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Buffalo

  • What is the cheapest flight from Ontario to Buffalo?

    In the last 3 days, the lowest price for a flight from Ontario to Buffalo was $154 for a one-way ticket and $242 for a round-trip.

  • Do I need a passport to fly between Ontario and Buffalo?

    No, a passport isn't needed to fly from Ontario to Buffalo. However, local authorities might ask for an official ID.

  • Which airports will I be using when flying from Ontario to Buffalo?

    Ontario airport is called Ontario and the only airport in Buffalo is Buffalo.

  • Which aircraft models fly most regularly from Ontario to Buffalo?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Buffalo?

    SkyTeam, oneworld, and Star Alliance are the airline alliances operating flights between Ontario and Buffalo, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Buffalo, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to Buffalo are Southwest and United Airlines. With an average price for the route of $429 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $456 and an overall rating of 7.4.

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

    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 Ontario to Buffalo.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Buffalo from Ontario 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 Ontario to Buffalo?

    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 to Buffalo with an airline and back to Ontario with another airline. Booking your flights between Ontario and BUF can sometimes prove cheaper using this method.

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

    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 to Buffalo from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Ontario to Buffalo

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Buffalo. 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 Ontario to Buffalo? 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 4242 reviews
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
Airline reviews

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

10.0 ExcellentRobert, Sep 2025SFO - LAS
Read more Southwest reviews

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

after landing, we stay 2 hours on the taxi way before reaching the gate The airline and the crew were good though

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

Not a great experience. We paid for the upgrade for premium economy seats and seated ourselves in very comfortable seats. Someone came along with the same seat on their boarding pass. The aircraft had been changed and as a result we were booted out and sent further back to small uncomfortable seats. After complaining we were moved to emergency row seats, which gave us more leg room but the seats don’t recline. For people in our 70’s we found having to sit upright from California to NJ very uncomfortable. Not sure why they chose to move senior citizens instead of the two people that were allowed to take the more comfortable seats. Not happy.

Everything was great. Only thing that could’ve made it better was buy on board options for hot food, but the snacks were decent. The flight attendants were great. I had no complaints. I was able to make it to my destination safely

Boarded plane and then delayed 1.5 hours while on the plane

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

Evidently, my seat had the only broken TV. I couldn’t plug it in, get it to come on, or watch anything, and of course, no one could fix it while we were on the plane. The service was good and the boarding was quick

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

While waiting to claim my checked luggage, I discovered the airline had lost it. After a long wait and inquiries, I discovered it was on another flight. Fortunately, the airline finally sent my luggage home.

Was not able to watch most shows on the entertainment site. They would not load

Flight was cancelled 3 hrs AFTER etd. Thetefore Missed connection from JFK to New Zealand . No accommodation provided… This cost ne aporox 1000 USD in extra expenses and turned whst should have been a 24 hr trip ftom Boston - New Zealand into a VERY expensive , late 70+ hr nightmare … Complete nonsense!!!

Overall fine, but the delay was annoying and the reasons for the delay were not communicated. The crew on board were phenomenal!

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

Whenever a passenger purchase a ticket his advantage number should automatically to his information. It's not everyone remember the number. You request for your number and American airline agent say they will email it....and they never email anything and you loose your mileage just because you don't remember your number. It should automatically go your information and associate with your email account at all times

Boarding took forever, the plane was cramped and cold, and the seatbelt song came on constantly throughout the red eye flight with a loud pre-recorded message playing each time

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

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.