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Popular airlines from Ontario Intl. Airport (ONT) to Buffalo Niagara Intl. Airport (BUF)

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Cheap Flights from Ontario Intl. Airport to Buffalo (ONT-BUF)

Prices were available within the past 7 days and start at $158 for one-way flights and $269 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

All deals

One way

Roundtrip

Tue, Sep 1 - Sat, Sep 5

ONT

Ontario

BUF

Buffalo

$269

Roundtrip

found 4 days ago

Mon, Oct 5 - Tue, Oct 6

ONT

Ontario

BUF

Buffalo

$270

Roundtrip

found 4 days ago

Tue, Sep 29 - Wed, Sep 30

ONT

Ontario

BUF

Buffalo

$271

Roundtrip

found 5 days ago

Sat, Sep 5 - Tue, Sep 8

ONT

Ontario

BUF

Buffalo

$274

Roundtrip

found 4 days ago

Wed, Oct 21 - Tue, Oct 27

ONT

Ontario

BUF

Buffalo

$275

Roundtrip

found 5 days ago

Wed, Oct 21 - Tue, Oct 27

ONT

Ontario

BUF

Buffalo

$276

Roundtrip

found 5 days ago

Sat, Sep 26 - Wed, Sep 30

ONT

Ontario

BUF

Buffalo

$283

Roundtrip

found 6 days ago

Sat, Sep 5 - Tue, Sep 8

ONT

Ontario

BUF

Buffalo

$288

Roundtrip

found 4 days ago

Tue, Sep 29 - Sat, Oct 3

ONT

Ontario

BUF

Buffalo

$304

Roundtrip

found 5 days ago

Tue, Sep 29 - Wed, Sep 30

ONT

Ontario

BUF

Buffalo

$367

Roundtrip

found 5 days ago

Alternative airports near Buffalo

Prices were available within the past 7 days. Prices and availability are subject to change.

BUF

Buffalo Niagara Intl.

CheapestClosest

16 min

Flights from $771

Find the cheapest month to fly from Ontario (ONT) to Buffalo (BUF)

April is typically the cheapest month to fly

From $292 - $747 per traveler.

What you need to know for your flight from Ontario Intl. Airport to Buffalo Niagara Intl.

Ontario (ONT) to Buffalo (BUF) at a glance

Travel from Ontario (ONT) to Buffalo (BUF) with a selection of airlines catering to this domestic short-haul route. You can explore various options, whether you're looking for full-service carriers or budget-friendly choices, to find the best fit for your travel plans and budget. Discover key details about flights from Los Angeles - Ontario International Airport to Buffalo Niagara International Airport as you prepare to experience the iconic sights and vibrant neighborhoods of Buffalo.

Fastest flight duration: around 5h 45m in-flight, plus roughly 1h 15m layover with one stop
Route distance: roughly 2,200 miles (3,540 km)
Flights per week: around 9 departures on average
Typical fares (one-way): economy tickets often range from $115–$485, depending on seasonality and how far ahead you book

Flights from Los Angeles - Ontario International Airport (ONT) to Buffalo Niagara International Airport (BUF)

Based on the latest traveler bookings, here are the top airlines favored for flights from Ontario to Buffalo, particularly for one-stop and multi-stop journeys. Common layover points include Denver International Airport (DEN) with about a 1-hour layover, O'Hare International Airport (ORD) at approximately 1 hour, and Midway International Airport (MDW) with a layover of around 1 hour and 15 minutes. This variety allows you to compare prices, total travel times, and cabin classes to create the ideal itinerary.

Southwest Airlines: This budget airline provides one-stop flights, with one-way ticket prices generally falling between $115 and $460. It holds about 43% of departures for this route, featuring a flight duration of 5 hours and 45 minutes, and a total travel time of approximately 7 hours, including layover.
United: A full-service airline that offers one-stop services, United's one-way fares typically range from $145 to $540. It is responsible for around 24% of route departures, with an in-flight time of 5 hours and 45 minutes, leading to an overall journey duration of roughly 7 hours, including layover.
American Airlines: This full-service carrier provides both one-stop and multi-stop options, with one-way fares generally priced between $145 and $480. It comprises approximately 17% of departures on this route, featuring a typical flight time of 5 hours and 45 minutes and a total travel time of about 7 hours.
Delta: As a full-service airline, Delta offers one-stop service with one-way fares usually ranging from $155 to $685. It accounts for around 10% of departures on this route, with an in-flight duration of 5 hours and 45 minutes, resulting in a total journey time of nearly 7 hours, including the layover.
Frontier Airlines: This low-cost airline provides one-stop services, with one-way ticket prices ranging from $115 to $180. It accounts for about 5% of the departures on this route, featuring a flight time of 5 hours and 45 minutes and a total travel duration of roughly 7 hours, including layover.

Travelers have the option to enhance their journey from Ontario to Buffalo, with United offering first-class service and Delta providing a premium economy cabin for a more comfortable experience.

Best time to fly from Ontario (ONT) to Buffalo (BUF)

The most popular months for travelers flying from Ontario to Buffalo are April, June, and October, when peak temperatures in Buffalo reach up to 66°F in June. If you prefer quieter travel, consider May, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 57.7°F. For better deals, December usually offers the lowest average one-way fare around $211. Flight availability peaks in October, with approximately 12 flights per week, making it easier to find convenient departure times.

Cheapest time to fly: December usually offers good deals with average one-way fare around $211, roughly 24% cheaper than the yearly average.
Most flight options: October has the highest number of flights from Ontario to Buffalo, with approximately 12 flights per week, giving you more flexibility in scheduling your trip.

Month	Temperature	Demand	Weekly Flights	Average one-way Fare
January	25.5°F (-3.6°C)	Low	8	$328
February	26.1°F (-3.3°C)	Low	8	$305
March	34.3°F (1.3°C)	Average	10	$350
April	45.0°F (7.2°C)	High	9	$251
May	57.7°F (14.3°C)	Low	7	$300
June	66.0°F (18.9°C)	High	10	$262
July	72.0°F (22.2°C)	Average	8	$324
August	70.7°F (21.5°C)	Average	9	$263
September	64.6°F (18.1°C)	Average	10	$248
October	53.2°F (11.8°C)	High	12	$245
November	41.4°F (5.2°C)	Average	10	$272
December	33.1°F (0.6°C)	Average	8	$211

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from Ontario (ONT) to Buffalo (BUF)

Ontario to Rochester (ONT-ROC): Greater Rochester International Airport (ROC) lies approximately 56 miles from Buffalo Niagara International Airport (BUF). One-way economy fares for this route generally fall between $125 and $440, influenced by the time of year and how far in advance you book. Travelers will find both one-stop and multi-stop flight options, with common layovers at Hartsfield-Jackson Atlanta International Airport (ATL) and Harry Reid International Airport (LAS). Leading airlines operating on this route include Southwest Airlines and Delta, and first-class service is also offered.
Orange County to Buffalo (SNA-BUF): John Wayne Airport (SNA) is located about 31 miles from Los Angeles - Ontario International Airport (ONT). Economy one-way tickets on this route typically range from $180 to $560, varying with the season and booking timing. Flights usually feature both one-stop and multi-stop choices, with frequent layover spots at O'Hare International Airport (ORD) and Dallas-Fort Worth International Airport (DFW). Major airlines on this route include American Airlines and United, and first-class service is available as well.

How to find the best prices for flights from Ontario (ONT) to Buffalo (BUF)

Getting some of the best deals on flights from Ontario to Buffalo is all about timing and flexibility. Here are some key tips to help you save:

Best times to book and fly: cheaper fares are typically available when booking at least 2 months in advance, although most travelers tend to book 2-8 weeks ahead. Early morning departures between 12 am and 5 am usually offer lower prices, while morning flights from 5 am to 12 pm are the most popular. Additionally, flying on Wednesday generally provides cheaper options, though Friday remains the busiest travel day.
Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Buffalo Niagara International Airport from Los Angeles - Ontario International Airport

Buffalo welcomes travelers from Ontario with a range of transport options based on price, convenience, and proximity. Here's how to reach Buffalo efficiently:

Hotel transfer: Transfers offer a convenient way to reach your hotel in Buffalo, with private rides that can be arranged in advance.
Car rental: Renting a car from Buffalo Niagara International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Buffalo Niagara International Airport on Expedia.
Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
Public transportation: From Buffalo Niagara International Airport, two key transport links are nearby; Buffalo-Depew Station, a train station, is about 2.6 miles away by car, while University Station, a metro station, is located approximately 6.5 miles away by car.

Frequently asked questions

How much does a flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) cost?

You can find cheap one-way flights from $158 and cheap return flights from $269 Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) with Expedia. One-way flights typically cost between $209 and $1049, and return flights often range between $387 and $1405. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.

What is the cheapest month to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

The cheapest month to fly from ONT to BUF is September when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.

Which airlines fly direct from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

Enter ONT to BUF and your travel dates, then apply the 'Nonstop' filter to see only direct flights.

How do I find cheap flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

To find a cheap flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

What is the best time to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.

What is the earliest flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

The earliest flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) typically departs at around 12:55 AM, operated by American Airlines. This is a seasonal service active in October and November, so if you're planning to travel during these months, an early flight can help you make the most of your time in Buffalo. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

What are the most popular departure times for flights from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

The most popular departure times for flights from Ontario (ONT) to Buffalo (BUF) are in the early morning, from 6am to 9am. About 39% of passengers prefer this time window. Many major carriers, including Southwest Airlines and United Airlines, operate flights during this time. This timing is favored as it allows travelers to arrive in Buffalo with ample time to explore the city.

How long does it take to fly from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

Flights from ONT to BUF with one stop typically take around 6 hours 50 minutes, covering approximately 2,168 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.

Can you fly business or first class from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

Select the "Business class" and "First class" filters when looking for ONT to BUF flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.

How do I earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) flight with Expedia?

It's easy to earn miles on a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

What airports do you fly into for Buffalo from Los Angeles - Ontario Intl. (ONT)?

From Los Angeles - Ontario Intl. (ONT), you can fly into Buffalo Niagara Intl. (BUF) to reach Buffalo. Some flights may connect through major hubs like Denver Intl. (DEN), San Francisco Intl. (SFO), Sky Harbor Intl. (PHX) before reaching Buffalo. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Is it cheaper to buy a plane ticket from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) at the last minute?

Typically, booking a last minute flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Is it cheaper to book a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) flight and hotel package?

Securing a Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) Buffalo Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

Can I cancel or change the date of my flight from Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.)?

If you booked your Ontario, CA (ONT-Los Angeles - Ontario Intl.) to Buffalo, NY (BUF-Buffalo Niagara Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport	Ontario Intl. Airport
Destination airport	Buffalo Niagara Intl.
Airlines serving	Alaska Airlines, American Airlines, Delta, JetBlue Airways, Southwest Airlines, United
Roundtrip price	$268
Distance	2167 mi

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Ontario Intl. Airport to Buffalo Flights

The cheapest times to fly from Ontario Intl. Airport to Buffalo

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario Intl. Airport to Buffalo are during the month of September. You can find some of the cheapest flights from Ontario Intl. Airport to Buffalo with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Ontario Intl. Airport to Buffalo

Sunday is one of the best days to book for cheap flights from Ontario Intl. Airport to Buffalo: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from Ontario Intl. Airport to Buffalo

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario Intl. Airport to Buffalo in 2026. You can also book with separate airlines for your outbound and return journeys, from $158 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario Intl. Airport to Buffalo flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario Intl. Airport to Buffalo airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

*Flight schedules are subject to change.

*Available to One Key members.

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Flights

$158 Cheap Flights from Ontario Intl. Airport (ONT) to Buffalo (BUF)

Popular airlines from Ontario Intl. Airport (ONT) to Buffalo Niagara Intl. Airport (BUF)

Be in the know

Book smarter

Earn twice

Cheap Flights from Ontario Intl. Airport to Buffalo (ONT-BUF)

Alternative airports near Buffalo

Find the cheapest month to fly from Ontario (ONT) to Buffalo (BUF)

April is typically the cheapest month to flyApril is typically the cheapest month to fly

What you need to know for your flight from Ontario Intl. Airport to Buffalo Niagara Intl.

Ontario (ONT) to Buffalo (BUF) at a glance

Flights from Los Angeles - Ontario International Airport (ONT) to Buffalo Niagara International Airport (BUF)

Best time to fly from Ontario (ONT) to Buffalo (BUF)

Alternative routes from Ontario (ONT) to Buffalo (BUF)

How to find the best prices for flights from Ontario (ONT) to Buffalo (BUF)

Arriving at Buffalo Niagara International Airport from Los Angeles - Ontario International Airport

Frequently asked questions

Travel information

Book with confidence

Ontario Intl. Airport to Buffalo Flights

Explore a world of travel with Expedia

April is typically the cheapest month to fly