ONT

$43 Find Cheap Flights to Ontario - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 9/2. 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

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Everything you should know

Cheapest round-trip
$70
Typical prices: $91-$262
Frontier
Sat 8/1Sat 8/8
SFO - ONT • Non-stop
Cheapest one-way
$43
Typical prices: $69-$137
Frontier
Wed 9/2
SFO - ONT • Non-stop
Top routes
Cheapest
Most popular
Insights
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When to book
in advance
Our data shows that travelers who book at least 5 weeks in advance save around 34% compared to booking last minute.
Insights
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Insights
Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
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Expert advice
Flight Deals

Cheap Flights to Ontario

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

Sat, Aug 1 - Sat, Aug 8
Frontier Logo
9:33 am - 11:07 am
SFO
-
ONT
1h 34mnonstop
Frontier Logo
8:58 am - 10:25 am
ONT
-
SFO
1h 27mnonstop
$70Frontier
Sat, Jul 25 - Wed, Jul 29
Frontier Logo
9:33 am - 11:07 am
SFO
-
ONT
1h 34mnonstop
Frontier Logo
8:58 am - 10:30 am
ONT
-
SFO
1h 32mnonstop
$71Frontier
Sat, Aug 22 - Thu, Aug 27
American Airlines Logo
6:59 am - 12:03 pm
ORD
-
ONT
7h 04m
1 stop
American Airlines Logo
12:59 pm - 11:30 pm
ONT
-
ORD
8h 31m
1 stop
$243American Airlines
Mon, Oct 5 - Sat, Oct 10
Southwest Logo
8:00 am - 9:25 am
HOU
-
ONT
3h 25mnonstop
Southwest Logo
11:50 am - 4:55 pm
ONT
-
HOU
3h 05mnonstop
$245Southwest
Tue, Oct 13 - Tue, Oct 20
American Airlines Logo
10:40 am - 11:53 am
DFW
-
ONT
3h 13mnonstop
American Airlines Logo
6:00 am - 11:15 am
ONT
-
DFW
3h 15mnonstop
$247American Airlines
Wed, Jul 29 - Tue, Aug 4
Southwest Logo
5:50 am - 9:35 am
HOU
-
ONT
5h 45m
1 stop
Southwest Logo
1:10 pm - 8:45 pm
ONT
-
HOU
5h 35m
1 stop
$255Southwest
Fri, Aug 21 - Sun, Aug 23
Delta Logo
6:40 pm - 11:34 pm
JFK
-
ONT
7h 54m
1 stop
Delta Logo
10:00 pm - 10:05 am
ONT
-
JFK
9h 05m
1 stop
$319Delta
Wed, Sep 16 - Fri, Sep 25
Alaska Airlines Logo
7:20 am - 2:16 pm
EWR
-
ONT
9h 56m
1 stop
Alaska Airlines Logo
10:47 am - 11:29 pm
ONT
-
EWR
9h 42m
1 stop
$369Alaska Airlines
Tue, Dec 15 - Tue, Dec 15
Alaska Airlines Logo
7:17 am - 2:47 pm
EWR
-
ONT
10h 30m
1 stop
Alaska Airlines Logo
6:10 pm - 5:58 am
ONT
-
EWR
8h 48m
1 stop
$403Alaska Airlines
Thu, Sep 24 - Sat, Sep 26
Delta Logo
3:18 pm - 10:26 pm
EWR
-
ONT
10h 08m
1 stop
Delta Logo
12:17 pm - 11:59 pm
ONT
-
EWR
8h 42m
1 stop
$405Delta
Booking Insights

KAYAK's insights & trends for flights to Ontario

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

What is the cheapest flight to Ontario?

These are the best round-trip prices found by users searching on KAYAK in the last 5 days.

In the last 5 days, the cheapest flight deal to Ontario was found on the route from San Francisco, at $70 return. The most popular connection is from Dallas to Ontario and KAYAK users have found round-trip deals for as low as $243 in the last 5 days.

How much is a flight to Ontario?

The average and cheapest price for all round-trip flights to Ontario from each origin found by users searching on KAYAK in the last month.

A flight to Ontario costs $288 on average. The cheapest price found on KAYAK in the last 2 weeks cost $28 and departed from San Francisco. The most popular routes on KAYAK are San Francisco to Ontario which costs $278 on average, and Seattle to Ontario, which costs $327 on average.

See prices from:

What is the cheapest day to fly to Ontario?

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

Based on KAYAK data, the cheapest day to fly to Ontario is Thursday where round-trip tickets can be as cheap as $248. On the other hand, the most expensive day to fly is Sunday, where round-trip prices are $316 on average.

What is the cheapest month to fly to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights to Ontario, 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 to Ontario is October, where tickets cost $257 on average for return flights. On the other hand, the most expensive months are June and December, where the average cost of tickets from the United States is $433 and $386 respectively. For one-way flights, the best month to travel is October with an average price of $179.

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

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

The cheapest time of day to fly to Ontario is generally in the evening, when round-trip flights cost $337 on average. The most expensive time of day to fly to Ontario is generally at night, which is peak travel time and where the average cost of a ticket is $347.

What is a good deal for flights to Ontario?

If you’re looking for cheap airfare to Ontario, 25% of our users found tickets to Ontario for the following prices or less: From Denver $184 round-trip, from San Jose $250 round-trip, from Chicago Midway Airport $268 round-trip.

How far in advance should I book a flight to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights to Ontario, 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, you should book around 5 weeks before departure, which saves you about 34% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

Expert advice

Expert advice for your flight to Ontario

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Frontier, United Airlines and Delta

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Harriet Baskas

Harriet Baskas

Expert on American Airlines and Alaska Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Good to know - Book Cheap Ontario Plane Tickets

Low seasonJanuary
Cheapest flight$43
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 5% increase in price.
Flight from San Francisco to Ontario

When to book flights to Ontario

Are your dates flexible? Find out the best times to travel to Ontario 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. The information is for flights to Ontario based on your location. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights to Ontario: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew to Ontario 
StevenFlew with Southwest
LAS
-
ONT
Jun 2026
Ontario airport is always easy to access, quick security lines, organized airport.
FraxysFlew with American Airlines
DFW
-
ONT
Feb 2026
Bring your own snacks or sandwich for dinner in the plane.

FAQs - booking Ontario flights

  • Are there good restaurants in Ontario International Airport?

    Passengers with flights to Ontario have several options when it comes to where to eat. Look for Schlotzsky’s Deli, El Paseo Cafe and Bar, and Route 66. You will find the restaurants and vending machines in Terminals 2 and 4.

  • Are there good malls or shopping places close to Ontario International Airport?

    Ontario Mills is the largest shopping mall and outlet mall in the Ontario area. Look for a variety of shops at Ontario Mills including Bath & Body Works, North Face, Coach, Polo, and Saks. Or, stop by the movie theater and enjoy a movie in between flights.

  • What kind of services does Ontario International Airport offer?

    At the airport, you can find shopping and dining options, free WiFi for up to 4 hours, cell phone parking lots, an inter-terminal shuttle, and a military lounge. Baggage carts are located for your use throughout the airport.

  • Do hotels in Ontario offer free shuttle service from Ontario International Airport?

    If you are looking for free shuttle service from the airport to a local hotel, you have two choices. Both Azure Hotel and Suites and Red Roof Inn Ontario offer free shuttle service to guests. They are both located approximately 5 minutes from the airport.

  • What is the best way to get from Ontario International Airport to Salt Oasis?

    Salt Oasis is located 6.1 miles from Ontario International Airport. The trip will take approximately 10 minutes by taxi by I-15N. Once you arrive, you can enjoy a salt bath and the salt caves. This is a relaxing way to spend time between flights or a way to de-stress before heading on to your final destination.

  • Can I take a rideshare from the Ontario International Airport (ONT) to my final destination?

    Yes, you can order an app-based rideshare once you land and have claimed your baggage. After baggage claim, follow the signs for “Ride-Share Pickup Location” and these are located near the east end of each passenger terminal.

  • Does the Ontario International Airport (ONT) have services for travelers with limited mobility?

    Yes, ONT offers several services for passengers with reduced mobility. These include wheelchair rental and assistance navigating the airport after landing, as well as services for deaf and visually impaired travelers. Contact your airline in advance if you will need to utilize any of these services.

  • Can I fly directly to the Ontario International Airport (ONT) from any other major US hubs?

    Yes, you will find plenty of direct flights to Ontario from major US cities. For example, United Airlines and Frontier Airlines both operate direct flights from Denver (DEN) to Ontario. You will also find direct flights on board JetBlue from New York City’s JFK airport. Alaska Airlines also offers a direct flight from Seattle to Ontario.

  • What other cities are served by the Ontario International Airport (ONT)?

    The ONT airport mostly serves the city of Ontario, but there are many cities and attractions nearby that it serves, as well. These include Riverside and San Bernardino, as well as the San Bernardino National Forest. It is also quite close to Anaheim, Los Angeles, and Pasadena, California.

  • What is the cheapest flight to Ontario?

    In the last 5 days, the cheapest flight deal to Ontario was found on the route from San Francisco, at $70 return. The most popular connection is from Dallas to Ontario and KAYAK users have found round-trip deals for as low as $243 in the last 5 days.

  • How far is Ontario Airport from central Ontario?

    Central Ontario is 3 miles away from Ontario Airport.

  • What is the name of Ontario’s airport?

    There is only 1 airport in Ontario, called Ontario Airport (ONT). It can also be referred to as Ontario or Ontario Intl.

  • How much is a flight to Ontario?

    On average, a flight to Ontario costs $288. The cheapest price found on KAYAK in the last 2 weeks cost $28 and departed from San Francisco Airport.

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

    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 to Ontario.

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

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

    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 Ontario 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 to Ontario?

    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 Ontario 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 Ontario

  • Looking for cheap airfare to Ontario? 25% of our users found round-trip tickets to Ontario for the following prices or less: From Chicago Midway $194, from Phoenix Sky Harbor Intl $238, from Portland $258
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Ontario flight deals.
  • Passengers that book flights to Ontario will want to take advantage of the free shuttle provided by the airport. The Ontario Courtesy Shuttle will take passengers between the terminals, parking lot 5, and the Consolidated Rental Car Facility. Shuttle services operate 24 hours a day.
  • Those that are in the military will want to stop by the USO Lounge. Access to the lounge is free to all active military and their families. In the lounge, you can find a TV, snacks, computers, a child care area, and a library. It is open from 6 a.m. to 10 p.m. and can be found in the West Wing for passengers who want somewhere quiet to wait between flights.
  • If you’re picking up or dropping people off at Ontario International Airport, check out the free cell phone lots. You can park there for free while you drop off or wait for your passengers. This area is designed to prevent people from circling the airport endlessly. You can park for free for one hour. No overnight parking allowed.
  • It’s easy to get to and from Ontario International Airport using a variety of transportation options. Look for the car rental services in ConRac which can be reached using the free shuttle service. Or, look for the shuttle, bus, taxi, or train services near the baggage claim area.
  • If you’re looking for business services while you’re at Ontario International Airport, you’ll want to visit the airport hotel located 6 minutes away. The Ontario Airport Holiday Inn offers fully equipped meeting rooms as well as printing, copying, scanning and office supplies.
  • If you are picking up a rental car when you land at the Ontario International Airport (ONT), you will need to take the free shuttle bus to the offsite rental car center. You can find the shuttle bus pickup points in front of terminals 2 and 4 at the Terminal Islands.
  • If you are flying into ONT with a pet, you will be happy to find several pet relief areas both inside and outside the terminal buildings. You will find them at terminal 2 gate 210 and terminal 4 gate 410. Otherwise, they are at the far end of each terminal building.
  • If you need to relax after your flight to Ontario, you can take advantage of the Aspire Lounge, which is open to all travelers flying into and departing from the ONT airport. You will find these in terminal 2 at gate 210 and in terminal 4 at gate 410.
  • Landed at the Ontario International Airport (ONT) and not sure where to go next? Visit one of the Travelers Aid desks. The desks are located both in terminal 2 and terminal 4 and are staffed by volunteers committed to helping you get the most out of your trip to Ontario.
  • Have you arrived at the Ontario International Airport (ONT) but your luggage has not? Head to the baggage claim counters in the arrivals area to report the incident to the representatives on duty. They will be able to track your luggage and arrange a delivery to your accommodation address once your luggage arrives in Ontario for your convenience. Just be sure to report it before you leave the airport.

Everything you need to know for your flight to Ontario

Flights with popular airlines flying to Ontario

Flights from the other most popular airlines that fly from the United States to Ontario according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.