SEA - ONT

$43 Find Cheap Flights from Seattle 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 from Seattle to Ontario departing on 5/28. 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

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Ontario, 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 Seattle to Ontario, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Seattle to Ontario

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

Recent round-trip flight deals from Seattle to Ontario

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Ontario.
Discover the best prices for you by selecting your travel dates on KAYAK.
Frontier Logo
1:50 pm - 4:30 pmSEA-ONT
2h 40mnonstop
Frontier Logo
11:33 am - 2:20 pmONT-SEA
2h 47mnonstop
$86Frontier
Find Deal
Sat, Jun 7 - Tue, Jun 10
Frontier Logo
1:50 pm - 4:26 pmSEA-ONT
2h 36mnonstop
Frontier Logo
10:03 am - 1:03 pmONT-SEA
3h 00mnonstop
$87Frontier
Find Deal
Sat, May 24 - Wed, May 28
Alaska Airlines Logo
8:26 am - 10:57 amSEA-ONT
2h 31mnonstop
Alaska Airlines Logo
4:45 pm - 7:25 pmONT-SEA
2h 40mnonstop
$137Alaska Airlines
Find Deal
Sat, May 31 - Sat, May 31
Alaska Airlines Logo
3:53 pm - 6:25 pmSEA-ONT
2h 32mnonstop
Alaska Airlines Logo
7:20 pm - 10:00 pmONT-SEA
2h 40mnonstop
$147Alaska Airlines
Find Deal
Tue, May 20 - Thu, May 29
Delta Logo
11:30 am - 2:15 pmSEA-ONT
2h 45mnonstop
Delta Logo
6:00 am - 8:55 amONT-SEA
2h 55mnonstop
$167Delta
Find Deal
Mon, May 19 - Wed, May 21
Hawaiian Airlines Logo
8:15 pm - 10:46 pmSEA-ONT
2h 31mnonstop
Hawaiian Airlines Logo
11:51 am - 2:35 pmONT-SEA
2h 44mnonstop
$187Hawaiian Airlines
Find Deal
Sun, May 18 - Wed, May 21
Southwest Logo
6:00 am - 11:00 amSEA-ONT
5h 00m1 stop
Southwest Logo
2:35 pm - 9:00 pmONT-SEA
6h 25m1 stop
$217Southwest
Find Deal
Thu, May 15 - Tue, May 20
Southwest Logo
5:30 am - 1:40 pmSEA-ONT
8h 10m1 stop
Southwest Logo
8:45 pm - 1:30 amONT-SEA
4h 45m1 stop
$232Southwest
Find Deal
Fri, Jun 13 - Sun, Jun 15
Hawaiian Airlines Logo
11:20 am - 5:06 pmSEA-ONT
5h 46m1 stop
Hawaiian Airlines Logo
10:00 am - 3:26 pmONT-SEA
5h 26m1 stop
$236Hawaiian Airlines
Find Deal
Sat, May 24 - Wed, May 28
Delta Logo
8:20 am - 11:04 amSEA-ONT
2h 44mnonstop
Delta Logo
7:05 pm - 10:07 pmONT-SEA
3h 02mnonstop
$237Delta
Find Deal
Tue, May 13 - Tue, May 13
Expert advice

Expert advice for your flight from Seattle to Ontario

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Frontier

Frontier's Economy Bundle includes a carry-on and seat choice, ideal for budget travelers.


Consider Premium Bundle for priority boarding and extra legroom, just $20 more than Economy.

Read more about Frontierby Stefanie Waldek
Alaska Airlines

Alaska's 20-minute bag guarantee ensures quick baggage claim or compensation.


Alaska's Premium Class offers extra legroom and free drinks on flights over 350 miles.

Delta

Delta's Comfort Plus offers extra legroom and priority boarding, enhancing short-haul comfort.


Enjoy free Wi-Fi on Delta flights for SkyMiles members, perfect for staying connected.

Read more about Deltaby Stefanie Waldek
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Frontier and Delta

Stefanie Waldek

Stefanie Waldek

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.

Read more
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines

Harriet Baskas

Harriet Baskas

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.

Read more
Useful Info

KAYAK's insights & trends for Seattle to Ontario flights

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

Find cheap flights to Ontario
Find cheap flights to Ontario

Planning a trip from Seattle to Ontario? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

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

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

For Seattle to Ontario, Thursday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Ontario back to Seattle, the best deals are generally found on Friday, with Monday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle 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 from Seattle to Ontario is September, where tickets cost $130 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is $266 and $236 respectively.

Can I save money by flying with a layover from Seattle to Ontario?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $362, prices are generally cheapest when you fly direct.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle 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 on the flight from Seattle to Ontario, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Good to know

Low seasonJanuary
High seasonJune
Cheapest flight$43
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 11% lower on average.
Flight from Seattle to Ontario

When to book flights from Seattle to Ontario

Are your dates flexible? Find out the best times to travel from Seattle 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. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

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

Insights shared by verified travelers who flew the route from Seattle to Ontario 
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.

FAQs for booking flights from Seattle to Ontario

  • Does SEA have facilities for disabled traveling passengers?

    You can use the sunflower lanyard program when you're departing from Seattle to Ontario and need assistance at the SEA airport. This program is available to passengers with hidden disabilities who need extra help with check-ins, security screening, and carrying luggage. If you'd like to use the service, you can request sunflower lanyards at the pre-security information desk, between checkpoints 3 and 4, or the post-security information desk in Concourse A.

  • Does Ontario Airport have pet relief areas?

    Once you land in Ontario, you can use the pet relief areas inside and outside the terminals if your pet needs relief. The outside areas are at the far end of the terminal buildings. The areas inside are near gates 210 and 410. The relief areas have waste disposal bags and bins, which you can use to clean after your pet.

  • Is there public transportation available from Ontario Airport?

    Ontario has a well-designed bus and rail transportation service. If you'd like public transport from ONT, you can use the public buses boarded at terminal 2. The buses are available every 20min.

  • Does Ontario Airport have a USO Military Lounge?

    The USO military lounge is a space for military members and their families to sit and relax. Families can access free internet services, entertainment, and food and drinks. The ONT USO lounge is across parking lot F.

  • What is the cheapest flight from Seattle to Ontario?

    In the last 3 days, the lowest price for a flight from Seattle to Ontario was $43 for a one-way ticket and $86 for a round-trip.

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

    No

  • Which airlines offer Wi-Fi service onboard planes from Seattle to Ontario?

    Alaska Airlines, Hawaiian Airlines, Delta, and American Airlines offer inflight Wi-Fi service on the Seattle to Ontario flight route.

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

    The Airbus A320neo is the aircraft model that flies most regularly on the Seattle to Ontario flight route.

  • Which airline alliances offer flights from Seattle to Ontario?

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

  • On which days can I fly direct from Seattle to Ontario?

    There are nonstop flights from Seattle to Ontario on a daily basis.

  • Which is the best airline for flights from Seattle to Ontario, Alaska Airlines or Delta?

    The two airlines most popular with KAYAK users for flights from Seattle to Ontario are Alaska Airlines and Delta. With an average price for the route of $269 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $259 and an overall rating of 8.0.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Seattle 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 Seattle 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 Seattle with another airline. Booking your flights between Seattle and ONT 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 Seattle 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 Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Seattle to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $99 or less one-way and $167 or less round-trip.
  • Seattle Airport (SEA) has made it easy for travelers departing from the airport and are interested in parking their cars. The airport has a pre-booking system that allows travelers to book a parking spot before arriving at the airport. You can use this feature through the airport's website.
  • When departing to Ontario from Seattle Airport, saving time at TSA screening is a priority. Fortunately, SEA has a service that allows passengers to reserve a screening spot through the SEA Spot Saver. Reservations and walk-in appointments for departing passengers are available from 5 am to 1 pm every day at checkpoints 2, 3, and 5 for all airlines.
  • There are various transport options when you land at Ontario Airport (ONT). You can pick up a rental car from the rental car facility. ONT has airport shuttles that ferry passengers from the terminals to the on-airport rental car center. The shuttles run every 5-20min and are at the Terminal Islands of terminals 2 and 4.
  • Waiting for your flight to Ontario at the Seattle Airport can be overwhelming. You can stay in the sensory room if you need a calming environment to minimize anxiety. The room is at the train level of the A gates STS Station.
  • Every day, people face life challenges. The busyness at the airport, waiting for a flight, going through security, and checking in can add to the stress. Seattle Airport has realized this and has a beautiful therapy dogs service. The airport has partnered with Pet Partners program, where Pet Partners and their trained animals offer animal therapy at the airport. A friendly dog face or hug goes a long way to reducing stress.

Prefer to fly direct from Seattle to Ontario?

Find which airlines fly direct from Seattle/Tacoma Intl Airport to Ontario Airport, which days they fly and book direct flights.

Direct departures

Seattle/Tacoma Intl to Ontario

Monday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

Tuesday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Wednesday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

Thursday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Friday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

Saturday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

Sunday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

See more direct flights

Direct returns

Ontario to Seattle/Tacoma Intl

Monday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

Tuesday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Wednesday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

Thursday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Friday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

Saturday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

Sunday

Alaska Airlines, Delta, Frontier, +8 more

Alaska Airlines, Delta, +9 more

See more direct flights
See more direct flights

Top 5 airlines serving from Seattle to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Ontario. 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 Seattle 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
Alaska AirlinesOverall score based on 9968 reviews
8.2Boarding
7.1Entertainment
8.5Crew
7.9Comfort
7.1Food
Airline reviews

Need to get on train for second flight it’s much nicer when all the gates are together for obvious reasons

8.0 ExcellentShura, Apr 2025SEA - BUR
Read more Alaska Airlines reviews

Need to get on train for second flight it’s much nicer when all the gates are together for obvious reasons

Cramped, crowded aircraft. Poorly organized boarding. Tasteless crackers to eat. 40 minutes late. A standard US air travel experience.

Flight was over an hour late, and we got notified every 15 minutes, beginning right at boarding, that it would only be 15 more minutes until we finally left about 75 minutes late. Of course, no compensation was offered.

I needed to board early and that was no problem. The snack was just ok. Alaska is an EXCELLENT airlines . . . luggage fast and easy.

Alaska Airlines needs more bag tag kiosks and bag check-in stations in Seattle. A single entry point for the bag tag kiosks would be helpful. This alleviates lines forming at each individual kiosk, which causes traffic jams for people passing through.

It was raining and cold and we had to walk outside to board the plane. And to have yo stand outside to wait in line to board. It seems they could find another way to send a few people at a time so passengers are not outside in the elements. Then to not have my luggage show up at my finally destination. Not happy with the whole experience.

I paid $49 to select my seat---6A a window seat just behind first class. When I started to get on the plane I was told that my seat had been given to someone else and I now had a middle seat. They finally gave me an aisle seat. When I told them I wanted my $49 back, I was told I would need to call alaska and fight with them to get my money back. And when i was on the flight people going by kept hitting me with their bags. I have tried calling alaska twice to talk about a refund but never got thru to the right person!

Check-in was easy, I did it from the app. Boarding was easy, the crew was great. Santa Barbara airport had a disabled plane so we had to land in Burbank to refuel. They kept us well informed, and everyone was great. A very entertaining person from the Burbank airport got on and told a few jokes.

It went very quickly even though we were late in leaving Fresno.

Like I said before the internet was shut off so there was little to do on this leg of the flight.

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.

I really like open seating. I hate that I've heard this is going away. This is one of the unique things that makes Southwest my goto choice.

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.

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.

Great staff. Wifi is terrible. Signing up for skylines is a painstaking process. Had to call customer service just to get my flight itinerary and confirmation sent to me. Consistent delays. A well staffed company that is run so poorly. Upper management needs to be renewed.

The crew was wonderful and attentive. The seats near exit row were restrictive. Offer healthy snacks please

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

Other then mechanical/ computer problem and 3.5 hours flight delay the flight was great. I guess that what happened when you fly an old airplane now a day.

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.

Coach seating is debilitating, neither my husband or I can walk the following day

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.

I'm was impressed with their service. Everything was great

All in All a great experience. Cost of luggage sucks … first time I ever had to pay for luggage. Otherwise the check in counter was awesome, the gate clerks were great and the Stewards & Esses were the best.

As my daughter was boarding the flight they pulled her from the line and told her, after she had checked in and checked a bag, that she could not board the flight due to a fraud flag on the debit card used for the ticket purchase. The personnel would not allow me to speak to them, saying I had to take it up with customer service that was not present. They tried to get my daughter to purchase another ticket on the spot or get out. The customer service personnel were insistant that the personnel at the gate be on the phone which they would not allow. Would not accept payment from three different accounts and did not resolve the issue. Many conflicting reports about the source of the problem, the fraud department is uncontactable. The only good thing to come of it was checked bag arrived. Our family will not be using Hawaiian Airlines. Ever.

Love Hawaiian you can’t go wrong, still provides you good drinks and little snack at the end

No tv’s. Had to walk 45 minutes to connect to next flight. Couldn’t get dinner as a result. Ended up eating pretzels until I felt sick.

Great plane, seats, and crew. Super smooth experience and delicious coffee

The pre-flight check in process was bad. The app didn't allow check-in online and forced me to check in at the airport. Alaska didn't have self-service kiosks for check in (only bag tagging stations), so I had to wait in line with people who were checking bags just to get my boarding pass.

Hawaiin airlines never let me know the alaska airlines confirmation number. it took chat and call with customer service to get that.

Flight delays, another inconvenienced passenger, and crew serving food and drinks with hair not tied (really very messy - made me apprehensive taking any uncovered food or drinks)

I think you should still be able to pick a seat at check in no matter the price tier. But the plane was decent. Seats were a little narrow so I imagine larger folks would have some discomfort but I was fine and the crew was great.

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….

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

i was denied boarding, even though i had an assigned seat, checked in on line and was at airport early. Then they refused to fully refund the the fair and replacement fair because they claimed it was "no show/denied boarding". I will never fly this airline again

Everything went as planned. Crew was great. Seats were still not that comfortable.

No frills for sure. No gate announcements about flight delay, not even water to drink on the flight.

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

Information on your arrival and departure airports

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