$43 Find Cheap Flights from North America to Ontario

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 8/17. 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.
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Cheap Flights from North America to Ontario

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

Wed, Jun 25 - Sun, Jun 29
United Airlines Logo
9:18 pm - 10:45 pmSFO-ONT
1h 27mnonstop
United Airlines Logo
6:10 am - 7:37 amONT-SFO
1h 27mnonstop
$57United Airlines
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Fri, Jun 20 - Mon, Jun 23
Frontier Logo
10:11 pm - 11:39 pmSFO-ONT
1h 28mnonstop
Frontier Logo
9:41 pm - 11:15 pmONT-SFO
1h 34mnonstop
$58Frontier
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Tue, Jun 10 - Tue, Jun 10
Alaska Airlines Logo
1:18 pm - 3:50 pmSEA-ONT
2h 32mnonstop
Alaska Airlines Logo
7:20 pm - 10:00 pmONT-SEA
2h 40mnonstop
$172Alaska Airlines
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Wed, Oct 29 - Tue, Nov 4
Alaska Airlines Logo
3:45 pm - 6:17 pmSEA-ONT
2h 32mnonstop
Alaska Airlines Logo
6:55 pm - 9:44 pmONT-SEA
2h 49mnonstop
$177Alaska Airlines
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Tue, Nov 4 - Tue, Nov 11
American Airlines Logo
10:30 pm - 11:45 pmDFW-ONT
3h 15mnonstop
American Airlines Logo
11:59 pm - 5:00 amONT-DFW
3h 01mnonstop
$209American Airlines
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Tue, Jul 1 - Tue, Jul 8
Southwest Logo
6:35 am - 3:40 pmSFO-ONT
9h 05m2 stops
Southwest Logo
5:25 pm - 11:25 pmONT-SFO
6h 00m1 stop
$235Southwest
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Fri, Aug 15 - Tue, Aug 19
American Airlines Logo
6:30 pm - 12:08 amHOU-ONT
7h 38m1 stop
American Airlines Logo
8:15 am - 3:50 pmONT-HOU
5h 35m1 stop
$237American Airlines
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Wed, Jul 2 - Sat, Jul 5
Delta Logo
8:15 am - 12:17 pmDFW-ONT
6h 02m1 stop
Delta Logo
6:00 am - 2:43 pmONT-DFW
6h 43m1 stop
$237Delta
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Tue, Aug 26 - Sat, Aug 30
Delta Logo
7:00 am - 4:18 pmIAH-ONT
11h 18m2 stops
Delta Logo
1:15 pm - 9:38 pmONT-IAH
6h 23m1 stop
$242Delta
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Fri, Aug 1 - Mon, Aug 4
Southwest Logo
5:25 pm - 11:10 pmORD-ONT
7h 45m1 stop
Southwest Logo
3:20 pm - 11:40 pmONT-ORD
6h 20m1 stop
$247Southwest
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Good to know

Low seasonFebruary
High seasonNovember
Cheapest flight$43
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from San Francisco to Ontario

Flights from North America to Ontario: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from North America to Ontario 
JustinFlew with FrontierDEN-ONTMar 2025
Bring your credit card - lots of fun places to eat at the airport
ROTKEOFlew with Alaska AirlinesSEA-ONTDec 2024
Alaska Airlines has always been great to fly in and out of Seattle.
Verified travelerFlew with Alaska AirlinesSEA-ONTOct 2024
SeaTac lets you make an appointment to get through security. SpotSaver. No cost. Online.
MelissaFlew with NAM AirJFK-ONTMar 2024
I would avoid JFK airport. The customs and security team were very rude and unprofessional and dropped my tray on the floor, busy entertaining each other and made a line up of tired travellers wait when it was not necessary. I appreciate this may not be their ideal job but professionalism in their behavior helps travellers feel respected and have a better experience. Caring, kindness and considerate attention makes all the difference for everyone.
LarryFlew with SouthwestOAK-ONTMay 2024
Oakland AP was nice and clean. Highly recommend to fly into the Bay Area.
JoelFlew with American AirlinesDFW-ONTMay 2024
Dallas is a very spread out airport, jus make sure that you have enough time to transfer during layovers. Also all the restaurants close fairly early
MichaelFlew with United AirlinesSFO-ONTMar 2024
Do not fly the late United flights. Every time I have done it the flight is very very late. I keep thinking “it couldn’t possibly happen again” and then it does. I should just drive my car instead of wasting my life on United airlines.

FAQs for booking flights from North America to Ontario

  • How does KAYAK find such low prices on flights from North America 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 from North America to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from North America 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 North America 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 to North America with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from North America 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 from North America up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top 5 airlines serving from North America to Ontario

Need help choosing which airline to fly with from North America to Ontario? 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 4289 reviews
7.6Entertainment
8.2Boarding
8.0Comfort
7.1Food
8.6Crew
Airline reviews

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

10.0 ExcellentAnonymous, Apr 2025LGB - SMF
Read more Southwest reviews

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

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

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

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

Plane late from DC to Austin 30 minutes. Crew made up much of the time enroute to San Diego.

Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

I will be flying again Southwest Airlines. Friendly crew, comfortable and affordable.

The plane arrived 25 minutes late, and the Wi-Fi was slower than it usually is.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

I love the free WiFi!! Crew was nice. Bathroom was decent. First time flying delta in a long time and I enjoyed it. Will definitely look into booking with Delta more but I think Delta is a little more expensive than the other airlines.

Seats are much much more comfortable than United, which is what I usually fly

If I pay extra for "comfort+" I expect leg room where I can stretch my legs. I was seated with an attendant's seat blocking my feet. Knee space was fine but my feet had less room than the non-"comfort+" seats. Also, don't go cheap on food when you have flights of 3+ hours. It's insulting.

Only one side of the heafphone jack work. Crew was friendly and helpful.

Great. Flight departed early and arrived early. Deplaning and baggage claim ww were quick.

They separated our seats and moved us to the back of the plane. Hundreds of dollars and thousands of miles used and this was my platinum member experience.

Since it wasn’t a Delta flight, I was not able to sit with my group and there was no entertainment.

Three adults, three children. They did not give us seats together. Two seats together, in row 23, one in 13, one in 14, one in 10, and one in 17. When we got on the plane, the crew tried to ask people to move but basically threw up their hands. One person moved so we had two pairs of seats together. The 1.5 year old sat on a parent's lap (despite having paid for his own seat).

the fight attendants were great and i appreciated that they had season 1 of The Wire from HBO as a viewing option

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

Its good expeince but in enternteiment please be like you tube the music i like or movie

I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.

A bit rush for transit. Food and entertainment are not available

Wonderful and fast TSA checkpoint. The line was fast and our gate was close by

The gate was too far away for the connecting flight

Generally good. The aisles have gotten narrower which can slow down boarding. Flight crew was great! Healthier complimentary snacks would be appreciated. Due to earthquake in San Francisco we had to circle in air space for a bit but then had a smooth landing. I laud the flight crew for their patience ;)

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

headphone jack didnt work for the first flight and not much variety

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.

Flight boarded from Gate 39 at OGG, the farthest gate in the terminal. There were no Hawaiian themed amenities for the flight. The first class service was mediocre at best; I received not special welcome or recognition as an executive platinum member of American Advantage program. The flight attendants were more concerned with their cell phones than saying "thank you" to the passengers as we disembarked. Fortunately, the flight arrived at LAX a few minutes early.

Bigger seats. Board back to front! Disembark front to back!

Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.

This flight didn’t happen because AA agents didn’t let us board the flight

Plane was pretty clean, staff was friendly and helpful, flight left about on time arrived early. Took a long time to board and get off the plane - carry on items didn't have enough room so people had to move all around to find places.

The service and food needs to improve to catch up with other international flights

Would have been good to have a meal since it was a 5.5 hour flight

We boarded after several delays due to mechanical failure and a gate change. The seat cushion in the exit row was very compressed and offered no cushion, making the four-hour journey reasonably uncomfortable. The WiFi worked for a few people, but for most, it did not, and you cannot get entertainment unless you can connect—American Airlines flights do not have seatback screens, and you must use your mobile phone.

AA is always pretty solid. Was on time all the way around today so can’t complain!

The reps working at the airport counter were dumber than a second coat of paint.

My costume jewelry was stolen out of my bag. Got to airport and my bag weighed 45 pounds- 5 pounds over cost me $100 Long lines in tier one. No entertainment No WiFi no free drinks or snacks

Not very good. Paid in excess of $400 for assigned seating for my family and that was not provided. I want that money back.

The seats were hard molded plastic covered in plastic vinyl. And the scam to charge people extra to sit together. Don’t they know we can just ask someone to trade seats. And watching the staff separate young children from parents… super classy. We had to guilt them into offering up our seats. This companies policies suck. Don’t give them your money.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Seats are uncomfortable but price is good. Guess I can put up with misery for four hours.

I’ve never traveled on Frontier before. If you want basic, no frills, friendly service at great prices then give them a fly!

I guess you get what you pay for. The seats are very uncomfortable and very little space. The snacks were pricey.

Cancelled and declined to find alternatives Earlier flight is 2 days later Sent the cancellation notification very late, wish I knew earlier would have stayed to watch the Miami open final game Very disappointing service

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

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