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ONT - SEA

$29 Find cheap flights from Ontario to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Seattle departing on 10/22. 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
0 bags
sáb. 8/24
sáb. 8/31

Search hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Seattle.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Seattle.
In the last 7 days travelers have searched 50,552,696 times on KAYAK, and here is why:

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Cheap flight deals from Ontario to Seattle (ONT-SEA)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Seattle 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 and deals for you by selecting your travel dates.
Choose your dates
9:50 am - 12:37 pmONT-SEA
2h 47mnonstop
1:37 pm - 4:14 pmSEA-ONT
2h 37mnonstop
$58Frontier
Find Deal
mié., oct. 23 - mié., oct. 30
9:50 am - 12:37 pmONT-SEA
2h 47mnonstop
1:22 pm - 3:59 pmSEA-ONT
2h 37mnonstop
$60Frontier
Find Deal
mié., nov. 6 - mar., nov. 12
4:01 pm - 6:37 pmONT-SEA
2h 36mnonstop
7:22 pm - 10:07 pmSEA-ONT
2h 45mnonstop
$78Frontier
Find Deal
mié., sep. 4 - lun., sep. 9
4:28 pm - 7:06 pmONT-SEA
2h 38mnonstop
6:40 am - 9:15 amSEA-ONT
2h 35mnonstop
$137Alaska Airlines
Find Deal
mié., sep. 11 - sáb., sep. 14
8:49 pm - 11:27 pmONT-SEA
2h 38mnonstop
6:40 am - 9:15 amSEA-ONT
2h 35mnonstop
$147Alaska Airlines
Find Deal
vie., sep. 13 - mar., sep. 17
2:04 pm - 4:45 pmONT-SEA
2h 41mnonstop
10:23 am - 1:24 pmSEA-ONT
3h 01mnonstop
$157Delta
Find Deal
mié., ago. 14 - jue., sep. 5
6:00 am - 8:45 amONT-SEA
2h 45mnonstop
4:30 pm - 10:15 pmSEA-ONT
5h 45m1 stop
$166Alaska Airlines
Find Deal
sáb., sep. 7 - sáb., sep. 7
7:00 am - 9:50 amONT-SEA
2h 50mnonstop
3:29 pm - 6:16 pmSEA-ONT
2h 47mnonstop
$167Delta
Find Deal
vie., ago. 23 - mié., ago. 28
6:00 am - 8:49 amONT-SEA
2h 49mnonstop
4:45 pm - 10:50 pmSEA-ONT
6h 05m1 stop
$176Alaska Airlines
Find Deal
jue., oct. 31 - dom., nov. 3
2:04 pm - 4:45 pmONT-SEA
2h 41mnonstop
3:29 pm - 6:16 pmSEA-ONT
2h 47mnonstop
$187Delta
Find Deal
jue., ago. 22 - mar., ago. 27

Flights from Ontario to Seattle - Travel Insights & Trends

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

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

The average price of all flights from Ontario to Seattle clicked on KAYAK for each day over the last 12 months.
If your flying dates are flexible, you should consider flying to Seattle on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Ontario to Seattle. For your return ticket, we recommend flying on a Wednesday and avoiding Sundays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Ontario to Seattle, 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 Ontario to Seattle is October, where tickets cost $154 on average. On the other hand, the most expensive months are December and June, where the average cost of tickets is $268 and $266 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Ontario to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Ontario to Seattle, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 47 days before departure.

Which airlines provide the cheapest flights from Ontario to Seattle?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The best deals for a one-way ticket found by KAYAK users over the last 3 days were on Frontier ($29) and Alaska Airlines ($79). The cheapest round-trip tickets were found on Frontier ($58) and Alaska Airlines ($137).

Which airlines fly most frequently between Ontario and Seattle?

Ontario and Seattle are connected by different airlines. The airlines that fly that route the most regularly are Alaska Airlines (28 flights per week), Delta (27 flights per week), and Frontier (7 flights per week).

Which airlines fly non-stop between Ontario and Seattle?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from Ontario to Seattle.
There are 3 airlines that fly nonstop from Ontario to Seattle. They are: Alaska Airlines, Delta and Frontier. The cheapest price of all airlines flying this route was found with Frontier at $58 for a one-way flight. On average, the best prices for this route can be found at Frontier.

How many flights are there between Ontario and Seattle per day?

Each day, there are between 8 and 9 nonstop flights that take off from Ontario and land in Seattle, with an average flight time of 2h 40m. The most common departure time is 10:00 am and most flights take off in the morning. Each week, there are 62 flights. The most frequent day of departure is Monday, when 15% of all weekly flights depart. The fewest flights depart on a Saturday.

Which cabin class options are there for flights between Ontario and Seattle?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There are 4 cabin class options for the route. These are First, Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from Ontario to Seattle take?

Direct flights cover the 956 miles separating Ontario to Seattle in about 2h 35m.

What’s the earliest departure time from Ontario to Seattle?

Early birds can take the earliest flight from Ontario at 6:00 am and will be landing in Seattle at 8:45 am.

What’s the latest departure time from Ontario to Seattle?

If you prefer to fly at night, the latest flight from Ontario to Seattle jets off at 9:09 pm and lands at 11:50 pm.

Good to know

Low season

January

High season

July

Cheapest flight

$29
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Ontario to Seattle

When to book flights from Ontario to Seattle

Are your dates flexible? Find out the best times to travel from Ontario to Seattle 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.

FAQs for booking flights from Ontario to Seattle

  • Is onsite parking available at Ontario International Airport?

    If you plan to leave your car at the airport, Ontario International Airport has a variety of parking options ranging from Valet Parking to premium parking, long-term parking, and even economy parking. Parking Lots 3 and 4 offer the best long-term parking options as cars are charged by the day instead of hourly, as is the case for other parking lots. Parking Lot 3 is the most convenient as it is located close to Terminal 4 and Terminal 2. Parking Lot 5, on the other hand, is the furthest from the airport terminals but also the cheapest one. Anyone parking here can use the free airport shuttle to get to the terminals.

  • Which is the cheapest way to get to Ontario International Airport?

    The bus is the most budget-friendly way to get from the city center to Ontario International Airport. They can be found at Holt @ Palm Eb Fs, where you’ll take the 61 bus. This bus goes directly to the airport, and you’ll be dropped off at Terminal Way 2 in less than 20min.

  • Does Seattle Tacoma International Airport have accessibility services?

    Seattle Tacoma Airport is equipped with special access facilities to provide travelers with a safe and easy way to get around the airport. For instance, points of access to all terminals, as well as other buildings within the airport, are fitted with ramps and escalators to make it easy for anyone in a wheelchair to get through. Similarly, all the toilets have an accessible stall for travelers with limited mobility.

  • What are the layover options when flying from Ontario to Seattle?

    If you’ve booked connecting flights, your layover will depend on the airline you’re flying with. Most airlines will stop at an airport that serves as their hub since it is cheaper and extremely convenient. For example, if you’re flying with Delta, you’re most likely to have a layover at Salt Lake City International Airport, the only hub for Delta Airlines on this route. Similarly, flights serviced by United Airlines are scheduled for a layover at San Francisco International Airport, which is a hub for the airline.

  • What is the cheapest flight from Ontario to Seattle?

    In the last 3 days, the lowest price for a flight from Ontario to Seattle was $29 for a one-way ticket and $58 for a round-trip.

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

    A passport is not required to fly from Ontario to Seattle.

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

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

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

    The Airbus A321neo is the aircraft model that flies most regularly on the Ontario to Seattle flight route.

  • Which airline alliances offer flights from Ontario to Seattle?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Seattle are Alaska Airlines and Delta. With an average price for the route of $229 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 $226 and an overall rating of 8.0.

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

    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 Ontario to Seattle.

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

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

    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 Seattle with an airline and back to Ontario with another airline. Booking your flights between Ontario and SEA 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 Ontario to Seattle?

    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 Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

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

  • Looking for a cheap flight? 25% of our users found flights on this route for $97 or less one-way and $140 or less round-trip.
  • Los Angeles International Airport (LAX) is about 50 miles away from Ontario International Airport (ONT). It provides an alternative to Ontario International Airport with better amenities and more flight options.
  • Holiday Inn Ontario International Airport is the closest hotel to the airport. If you have an early morning flight, consider spending the night here to avoid the hectic commute to the airport.
  • If you want to watch Netflix or get some work done during your flight, consider booking with Delta Airlines. They offer in-flight Wi-Fi, and the seats have power and USB outlets in case you want to recharge your devices.
  • Ontario International Airport has a good number of pet relief areas in case you’re traveling with a pet or service animal. You can find them in Terminals 2 and 4, near Gates 210 and 410, respectively.
  • Seattle-Tacoma International Airport (SEA) has shower facilities in case you want to freshen up after your flight. They can be found in the Delta Airlines Sky Club located at Concourse A, near Gate 1.
See more tips

Prefer to fly non-stop from Ontario to Seattle?

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

Nonstop departures

Ontario to Seattle/Tacoma Intl

Monday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Tuesday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Wednesday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Thursday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Friday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Saturday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Sunday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

See more direct flights

Nonstop returns

Seattle/Tacoma Intl to Ontario

Monday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Tuesday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Wednesday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Thursday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Friday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Saturday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Sunday

Alaska Airlines, Delta, Frontier, +5 more

Alaska Airlines, Delta, +6 more

See more direct flights
See more direct flights

Top 5 airlines serving from Ontario to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Seattle. 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 Ontario to Seattle? 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 9365 reviews
7.2Entertainment
7.9Comfort
7.2Food
8.2Boarding
8.6Crew
Airline reviews

The seats were comfortable, the overhead bins were ample, the staff was helpful, attentive, and friendly. I enjoyed free texting. However, I much prefer Southwest no reserved seats (take any unoccupied seat) and their policy of two checked bags free, and ability to freely change flights. The Alaska airplane was nicer and newer than the Southwest one. Overall, my Alaska Airlines flying experience was a very positive one.

10.0 ExcellentAnonymous, Jul 2024SJC - SEA
Read more about Alaska Airlines reviews

The seats were comfortable, the overhead bins were ample, the staff was helpful, attentive, and friendly. I enjoyed free texting. However, I much prefer Southwest no reserved seats (take any unoccupied seat) and their policy of two checked bags free, and ability to freely change flights. The Alaska airplane was nicer and newer than the Southwest one. Overall, my Alaska Airlines flying experience was a very positive one.

We boarded the flight just fine. After an hour of not moving people started asking what was going on. Finally after 1 hr and 40 minutes of being in this plane which was no longer fresh but hot due to all the bodies and the 114 degrees outside. They decided to open the door back up and asked whom ever wanted to deplane could and we would be boarding 15 minutes after. That did not happen. Was over a 3 hr delay and had to run to work it connecting flight once we landed in Seattle.

The flight was delayed by more than 2 hours which delayed all our plans.

Flying isn’t always fun but my flight was good and that’s saying alot

This is where things were a bit upsetting first the wheelchair assistance person not only was playing games at first leaving us to wonder. When I did get another person to help she took me to the gate the Alaska Airlines person Alex was rude. I didn't have a seat assigned which was not helping my travel anxiety, he honestly didn't seem to care when he step away I came to another agent named John who was very empathetic and kind. He looked in his computer and gave me a seat realizing my situation.

Friendly staff on the ground and in the air. On time performance. Comfortable seats and friendly flight attendants.

Everything was good except the flight out of Pasco was delayed so long we almost missed our connection in Seattle - had to literally run from one gate to the next!

No leg room but flight is smooth flying. Pretzels really?

The pilots were great. Service was good. Wish I had more room in the seating area because I was seated next to the only other large person. He took up a little of my seat as well. Very nice man. Wish the crew could have done a small shuffle to make it better for both of us. Still, it was a good trip both ways. Thank you

I didn’t know that food needed to be ordered ahead. Please include this in the reservation information. Overall, very good experience.

The flight was great. The crew were a little terse about the size of my bag. It fit fine.

Screen didn’t play movies, do I was pretty boated the entire flight.

It was very cold because the air conditioner was on high power, and my son got sick.

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

Delta is one of the best airlines I have flown

It was a Red-Eye flight so was not comfortable enough to sleep, but seat was as expected. Crew was great and in-flight entertainment was excellent. Flight was smooth

Standard economy seats on Deltas 767 were better than Alaska premium seats on their 737 MAX9; more legroom, wider seats. Entertainment was great, no ipad or phone required. Could have included a meal service.

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

The boarding process was terrible especially with an indirect flight Chicago to Seattle to San Diego was terrible talking about we overbooked a flight idk if I’d take this airline ever again we got off our flight from Chicago to Seattle and we traveled for business and they told us our connecting flight was over booked and their was no seats asking people to take a delayed next flight and they don’t tell anyone coughing to wear masks seats 30A-B were terrible during the flight no one wants to sit next to people coughing all around I don’t want to be sick traveling for work or get sick anytime it’s very upsetting the staff doesn’t take this stuff serious to tell them to wear masks when they see people coughing and sneezing

Flight was on time, the crew was personable & professional, & the plane arrived early which was nice.

This flight was 2.5 hours delayed due to crew issues. This meant that we arrived after 2 AM. Very very inconvenient and we were not really kept well informed.

The flight was delayed, but other than that everything was fine.

United is today and old, the planes, the staff, the business processes. Yet they expect premium prices for a less than average flight experience. I should have remembered to stay away from them and will remember to stay away from them in the future since I'm traveling a lot again. In a nutshell, they suck eggs.

The entertainment wasn’t playing in the app or online.

Horrible, the flights kept delaying, so it is obvious that we won't be able to make it to the next connection. No easier/real agent on site to help you figure this out. UA agent on other counters refuse to assist you and direct us to use the QR code/call customer service. So inefficient and poor. While technology seems convenient, but it's not the best interest/experience for customers need help while there is active issue need assistance.

Flight was delayed due to the late arrival of the catering truck, which is quite unacceptable. There was a beverage service, but no pretzel, or cookie, or nuts were served in coach.

I had a great flight. Everything went smoothly and the flight arrived early.

On time take off…US cabins look tired and need of refresh!

An hour and a half late is UNACCEPTABLE. The negative impact to our family is unconscionable. And for the price we were forced to pay...

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

Spirit airlines is very bad airline staff doesnt know how to treat passangers they didnt allow us in the flight we reached 45 minutes ago from flight departure but they denied nd said you are late Very disappointed i never reccomend spirit airlines

They charge you for everything. Even water. They accepted my dog as a service dog in my reservation. Then they asked for a DOT form that was impossible to provide. I had to pay $175 for my service to fly with me, that would protect me from death if I ate peanuts. They did not however, serve peanuts on the plane.

Traveling on Spirit Airlines was awful. It was by far the worst airline we ever traveled on. There is no food service at all unless you paid for it. Even a cuppa coffee or a water was $5 . I’ve never been in a seat so close to the one in front of me. There was literally 10-12 inches from my face to the seat back in front of me. We actually all had to laugh at the size of the tray table. Never see a tray table so small, and I don’t even see the point of it. By booking through Spirit, but after I paid for checked luggage, water, coffee, I would’ve been better off going with our usual airline where everything was included. It actually would’ve been cheaper and way more comfortable. We joked that we were actually surprised they didn’t give us tokens just to use the bathroom. My daughter even knows she would never travel on Spirit again, and she’s not high maintenance at all. Aweful

The nickel and diming everyone was disappointing...I saw an elderly lady charged $80n for a seat because she didn't understand she had to purchase not only a ticket but a seat. I saw a father charged 3 times for carry ons for a stroller and 2 car seats. Very disappointing...I also overheard an employee tell a customer, "you either pay up or don't fly." It was an elderly man who was confused over having to purchase the seat...it is very confusing on what the ticket is for if not for a seat...

Spirit is very bare bones travel. You definitely get what you pay for. About as comfortable as riding a school bus. The tray table is a tiny little shelf that barely fits a phone, and there is not even a seat pocket to hold anything securely. They have an open bungee cord configuration, that phones fall out of. There are no drinks or snacks, unless you purchase them. Same for wifi, although it wasn’t even available for purchase on our outgoing flight. But the crew was friendly, and the plane was clean, although we did not check the onboard restroom. Basically, if you are looking for a very inexpensive flight to a nearby location, and you don’t care if wifi is available, it works. Our flight was around 90 minutes—Oakland to Las Vegas—so it was not horrible. I would never even consider flying cross country in it. That would be miserable. But for a quick trip of under two hours, it was worth the price.

Keep your expectations low and you will be pleasantly surprised

This was one of the smoothest flights in 37 years of flying, excellent pilots! Polite and caring staff. Nice clean and new plane 10/10

It was delayed 7 hours!!!!! We had to spend $550 on new flights so we didn’t miss our evening event for family. It was absolutely ridiculous. Our flight was suppose to leave at 9:30 am. Nobody was there to even help until 12:30. Worst experience ever.

Flight kept being delayed on airport board without any announcement. We were delayed almost 2 hours. Finally boarded and we had no pilots so we sat on a hot plane with screaming kids and no pilots for 40 minutes. Finally he came aboard and did paperwork for 10 minutes before we took off. No apologies or any explanations or even excuses from ANY staff in the entire process. Worst experience ever on the ground and the air I have had.

Delays delays and more delays in both LAX and San Jose. And then I said something else flight was supposed to arrive in Portland at 12:04 but didn't land until 2:30 PM which made me late for my appointment.

After 5 hours of delay, they cancelled the flight. Very disappointed

My flight to LA was cancelled. I waited at the airport for 3 hrs saying it was delayed and then all of a sudden it was cancelled. Frontier only gave me a voucher and refund but could not rebook me. Flights on other airlines were too expensive last minute. I had to drive down to LA and didn’t even take my return flight home since I had to drive. One of the worst airline experiences in my life. It’s crazy how airlines can just upend people’s plans just like that.

Flight was 3 hours late leaving. Poor communication from the staff about delays. Impossible to get in touch with customer service (by design). And it actually didn't come out to be much cheaper than a non-budget airline! Not worth the headache, I'm never flying Frontier again

The flight attendence were extremely rude and I am disabled

They wouldn’t let us on the flight even tho we were an hour early. No refund not even our bags that were prepaid

I did not enjoy the trip home on Frontier for several reasons: there is too much cost besides the flight, which was more than I would normally pay, then having to pay for luggage, and carry-on, seat (if you want to reserve when booking) then you must pay over $3 for a can of soda, and $4 for a snack. A cup of water is free.

I strongly dislike Frontier. I find them barebones, the seats not particularly comfortable, the nickel and diming is maddening, the app is TERRIBLE - super confusing to navigate, and the last 4 frontier flights I have flown have been on AVERAGE 2 hours late, one ruining a fancy night out in Vegas with reservations made well in advance, which was nodded to with a measly 5000 miles, which translates to almost nothing. At least credit a free checked bag or something.

8 hr delay. had to buy another ticket with another airline

I appreciated the upgrade to free cary-on bag and seat selection at no charge

Flight was delay 9hrs and nothing was provided at airport, had to go and get a room to sleep in, paid for Uber back and fort with no offers until we landed back home a 1hr later for a $75 voucher for a future flight.

Book cheap flights from Ontario to Seattle

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Ontario to Seattle found on KAYAK in the last 72 hours.
10/22mar.
nonstopFrontier
2h 47mONT-SEA
$29
11/12mar.
nonstopFrontier
2h 47mONT-SEA
$30
10/23mié.
nonstopFrontier
2h 47mONT-SEA
$31
9/13vie.
nonstopAlaska Airlines
2h 38mONT-SEA
$79
10/22mar.
1 stopAlaska Airlines
6h 50mONT-SEA
$98
10/24jue.
1 stopUnited Airlines
4h 24mONT-SEA
$100
10/6dom.
1 stopUnited Airlines
5h 24mONT-SEA
$119
8/7mié.
nonstopDelta
2h 50mONT-SEA
$129
8/8jue.
nonstopDelta
2h 41mONT-SEA
$149
8/8jue.
1 stopAmerican Airlines
7h 24mONT-SEA
$193

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Last minute flights from Ontario to Seattle

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Ontario to Seattle that are departing in the next 10 days.
7/30mar.
nonstopFrontier
2h 36mONT-SEA
8/1jue.
nonstopFrontier
2h 47mSEA-ONT
$100
7/30mar.
nonstopFrontier
2h 36mONT-SEA
9/14sáb.
multi-stopFrontier
9h 36mSEA-ONT
$123
7/30mar.
nonstop
2h 36mONT-SEA
8/6mar.
multi-stop
6h 11mSEA-ONT
$192
7/29lun.
multi-stop
7h 49mONT-SEA
8/6mar.
multi-stop
6h 11mSEA-ONT
$267
7/30mar.
multi-stopUnited Airlines
8h 58mONT-SEA
9/14sáb.
multi-stopUnited Airlines
5h 00mSEA-ONT
$357
7/29lun.
multi-stopUnited Airlines
9h 15mONT-SEA
9/14sáb.
multi-stopUnited Airlines
5h 00mSEA-ONT
$372
7/30mar.
multi-stopAlaska Airlines
5h 32mONT-SEA
7/30mar.
multi-stopAlaska Airlines
6h 05mSEA-ONT
$426
7/29lun.
multi-stopDelta
6h 57mONT-SEA
8/6mar.
multi-stopDelta
6h 42mSEA-ONT
$436
7/29lun.
nonstopDelta
2h 44mONT-SEA
7/31mié.
nonstopDelta
2h 50mSEA-ONT
$444
7/27sáb.
multi-stopAlaska Airlines
5h 32mONT-SEA
7/31mié.
multi-stopAlaska Airlines
6h 11mSEA-ONT
$476

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Ontario - Seattle Flights

Departure:

Ontario (ONT)United States

Destination:

Seattle (SEA)United States

Return flight deals:

Seattle - Ontario

Cabin classes:

$358
$343
$349
$73