Cheap Flights from Buffalo Niagara to Ontario International

Compare Buffalo Niagara to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from Buffalo Niagara to Ontario International

Looking for a cheap last-minute deal or the best return flight from Buffalo Niagara to Ontario International? Find the lowest prices on one-way and return tickets right here.

Ontario.$563 per passenger.Departing Wed, 13 May, returning Wed, 13 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Wed, 13 May, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 13 May, arriving in Buffalo Niagara.Price includes taxes and charges.From $563, select.

Ontario.$565 per passenger.Departing Tue, 17 Mar, returning Wed, 25 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Tue, 17 Mar, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 25 Mar, arriving in Buffalo Niagara.Price includes taxes and charges.From $565, select.

Ontario.$584 per passenger.Departing Sat, 11 Apr, returning Sat, 18 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Sat, 11 Apr, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 18 Apr, arriving in Buffalo Niagara.Price includes taxes and charges.From $584, select.

Ontario.$589 per passenger.Departing Sat, 25 Apr, returning Sat, 2 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Sat, 25 Apr, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 2 May, arriving in Buffalo Niagara.Price includes taxes and charges.From $589, select.

Ontario.$627 per passenger.Departing Mon, 16 Mar, returning Wed, 1 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Mon, 16 Mar, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 1 Apr, arriving in Buffalo Niagara.Price includes taxes and charges.From $627, select.

Ontario.$663 per passenger.Departing Wed, 2 Sep, returning Tue, 8 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Wed, 2 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 8 Sep, arriving in Buffalo Niagara.Price includes taxes and charges.From $663, select.

Ontario.$684 per passenger.Departing Wed, 29 Jul, returning Wed, 5 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Wed, 29 Jul, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 5 Aug, arriving in Buffalo Niagara.Price includes taxes and charges.From $684, select.

Ontario.$704 per passenger.Departing Wed, 15 Jul, returning Wed, 22 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Buffalo Niagara on Wed, 15 Jul, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 22 Jul, arriving in Buffalo Niagara.Price includes taxes and charges.From $704, select.

Find the cheapest month to fly from Buffalo Niagara to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Buffalo Niagara to Ontario International flights are currently cheapest in May.

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Buffalo Niagara to Ontario International: Alternative routes

Compare routes from Buffalo Niagara to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

Buffalo to Ontario: Flight information

The things to know before you go.

Cheapest flight found	$563
Cheapest month to fly	May

Finding cheap flights from Buffalo Niagara to Ontario International: Frequently asked questions

How much are return flights from Buffalo Niagara to Ontario International?

The best price we found for a return flight from Buffalo Niagara to Ontario International is $563. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Which airlines fly direct from Buffalo Niagara to Ontario International?

Currently, there are no airlines that fly direct from Buffalo Niagara to Ontario International. But we found flights with one or more stops from $563.

How many flights are there a week from Buffalo Niagara to Ontario International?

As of February 2026, there are no flights flying from Buffalo Niagara to Ontario International.

When is the cheapest time to fly from Buffalo Niagara to Ontario International?

The cheapest month to fly from Buffalo Niagara to Ontario International is usually May.

Which upcoming date is cheapest to fly from Buffalo Niagara Airport to Ontario International Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Buffalo Niagara Airport to Ontario International Airport on Wednesday, 13 May 2026.

Can I get a direct flight from Buffalo Niagara Airport to Ontario International Airport?

No airlines currently offer direct flights between Buffalo Niagara Airport and Ontario International Airport. Most routes have one or more stops.

How can I find the best flight deal to Ontario International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Ontario?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Buffalo Niagara Airport to Ontario International with?

Currently, Southwest Airlines offers the cheapest flight tickets to Ontario International.

Travelling from Buffalo Niagara International Airport (BUF) to Ontario International Airport (ONT): what you need to know

Ontario is three hours behind Buffalo and observes the UTC-7 timezone.
To ensure you catch your BUF to ONT flight, leave plenty of time to check in and find your gate. Arriving two hours ahead of international departures and an hour before domestic flights is the standard rule.
You'll likely experience longer lines in popular months such as August. Arriving up to four hours in advance for an international flight and two hours for a domestic departure will give you ample time for security and boarding.
If you want to add a stop to your trip, just deselect 'Direct flights only' when searching for your ticket from Buffalo Niagara International Airport to Ontario International Airport. Here are the top stopovers between BUF and ONT:
- Chicago Midway International Airport
- Nashville International Airport
- Harry Reid Airport (formerly McCarran Airport)

How to find the cheapest flights from Buffalo Niagara International Airport (BUF) to Ontario International Airport (ONT)

The lowest price we've found for a one-way Buffalo Niagara International Airport to Ontario International Airport flight is $294. A round-trip plane ticket is currently $563. Depending on the availability and when you book, these fares can change.
Don't wait until the last minute. You're more likely to get cheap tickets from BUF to ONT if you book ahead. Airlines often have some amazing early bird rates.
If you're willing to be flexible with your travel plans, try using the 'Whole month' search function. It'll find the cheapest price in each month when searching for a flight from Buffalo Niagara International Airport to Ontario International Airport.
Landing cheap flights from BUF to ONT is a breeze with Price Alerts. All you need to do is set up one of these automatic alerts and we'll let you know as soon as a new deal comes up.
Secure the ideal flight for you with the help of the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Buffalo Niagara International Airport to Ontario International Airport, use the 'Sort by' function. You can also filter results by departure and arrival times, airline, and number of stops.

Handy information about Buffalo Niagara International Airport (BUF)

The address for BUF is Genesee Street.
Of all flights leaving Buffalo Niagara International Airport, 75.46% arrive as scheduled at their destination.
Central Buffalo to Buffalo Niagara International Airport is around 18 kilometres. Depending on traffic, it'll take about 20 minutes to get there if you're driving, catching a cab or ride-sharing.
You can expect a trip time of around 1 hour 15 minutes on public transport.
Get your break off to a hassle-free start by staying near BUF. Whether you're boarding an early flight from Buffalo Niagara International Airport to Ontario International Airport or want to avoid feeling rushed, these hotels are perfect:

Arriving at Ontario International Airport (ONT)

Reserve a hotel near ONT if you're taking a late Buffalo Niagara International Airport to Ontario International Airport flight. Choose one of these accommodation options and make your arrival easier:
Travel at your own speed with an Ontario International Airport rental car. Book your wheels from Dollar, Fox - Rent A Car or Thrifty and venture far and wide through Ontario and beyond.
For the best deal, reserve your vehicle from Ontario International Airport around three weeks ahead.

Getting from Ontario International Airport (ONT) to central Ontario

The street address for ONT is 2900 E. Airport Drive.
Ontario International Airport is roughly 6 kilometres from central Ontario. The drive time takes about 10 minutes.
Travelling to the centre by public transport takes roughly 1 hour 30 minutes.

When to fly to Ontario International Airport (ONT)

August is the busiest month for flights from Buffalo Niagara International Airport to Ontario International Airport. To escape the crowds, go to Ontario in May.
Before locking in your flight from Buffalo Niagara International Airport to Ontario International Airport, consider the type of weather you enjoy. August is the warmest month in Ontario, with the temperature ranging from 15ºC to 35ºC.
If you like travelling in cooler conditions, search for a cheap ticket from BUF to ONT in January. Average temperatures are between 4ºC and 23ºC then.

Explore more of United States

You've visited Ontario, now it's time to discover other parts of United States. Travel around 56 kilometres west to Los Angeles to check off its popular sights. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, you've got a jam-packed schedule ahead.
Around 153 kilometres south of Ontario, San Diego is another favourite stop in United States. Start your sightseeing at San Diego Zoo, USS Midway Museum and SeaWorld San Diego.