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SEA - ONT

$28 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 11/23. 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

Search 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
In the last 7 days travelers have searched 46,479,581 times on KAYAK, and here is why:

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Cheap Flight Deals from Seattle to Ontario (SEA-ONT)

 
These are the cheapest deals for flights from Seattle to Ontario currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. 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

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Seattle to Ontario.

Recent one-way flight deals from Seattle to Ontario

Only flying one-way? Below are some of the best one-way flight deals from Seattle to Ontario found on KAYAK recently.

Recent last minute flight deals from Seattle to Ontario

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from Seattle to Ontario.

Recent direct flight deals from Seattle to Ontario

The latest deals for direct flights from Seattle to Ontario so you can sit back and relax without the need for a layover.

Cheap bus & train deals from Seattle to Ontario

Find recent round-trip train or bus tickets from Seattle to Ontario.

All round-trip flight deals to Ontario

The cheapest plane tickets to Ontario found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
7:10 pm - 9:50 pmSEA-ONT
2h 40mnonstop
7:58 am - 10:54 amONT-SEA
2h 56mnonstop
$56Frontier
Find Deal
Thu, Nov 21 - Thu, Nov 28
7:10 pm - 9:50 pmSEA-ONT
2h 40mnonstop
7:58 am - 10:54 amONT-SEA
2h 56mnonstop
$57Frontier
Find Deal
Thu, Nov 21 - Tue, Nov 26
6:35 pm - 9:15 pmSEA-ONT
2h 40mnonstop
7:58 am - 10:54 amONT-SEA
2h 56mnonstop
$58Frontier
Find Deal
Fri, Nov 22 - Thu, Nov 28
2:00 pm - 4:45 pmSEA-ONT
2h 45mnonstop
5:50 am - 8:55 amONT-SEA
3h 05mnonstop
$117Delta
Find Deal
Thu, Dec 5 - Sun, Dec 8
2:00 pm - 4:45 pmSEA-ONT
2h 45mnonstop
5:50 am - 8:55 amONT-SEA
3h 05mnonstop
$118Delta
Find Deal
Thu, Dec 5 - Sun, Dec 8
9:31 pm - 11:59 pmSEA-ONT
2h 28mnonstop
6:00 am - 8:50 amONT-SEA
2h 50mnonstop
$137Alaska Airlines
Find Deal
Sat, Nov 23 - Tue, Nov 26
9:26 pm - 11:59 pmSEA-ONT
2h 33mnonstop
7:00 am - 12:52 pmONT-SEA
5h 52m1 stop
$146Alaska Airlines
Find Deal
Fri, Dec 13 - Mon, Dec 16
11:36 am - 4:59 pmSEA-ONT
5h 23m1 stop
12:49 am - 8:37 amONT-SEA
7h 48m1 stop
Tue, Feb 18 - Fri, Feb 21
6:35 pm - 9:15 pmSEA-ONT
2h 40mnonstop
1:53 pm - 4:46 pmONT-SEA
2h 53mnonstop
Fri, Nov 29 - Sat, Dec 7
4:35 pm - 10:23 pmSEA-ONT
5h 48m1 stop
6:28 pm - 11:44 pmONT-SEA
5h 16m1 stop
$201United Airlines
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Sat, Nov 23 - Sun, Nov 24
7:22 pm - 10:02 pmSEA-ONT
2h 40mnonstop
$28Frontier
Find Deal
Sat, Nov 23
7:21 pm - 9:59 pmSEA-ONT
2h 38mnonstop
$29Frontier
Find Deal
Tue, Dec 17
6:35 pm - 9:15 pmSEA-ONT
2h 40mnonstop
$32Frontier
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Fri, Nov 22
7:55 pm - 10:42 pmSEA-ONT
2h 47mnonstop
$59Delta
Find Deal
Sat, Dec 14
6:35 am - 11:49 amSEA-ONT
5h 14m1 stop
$61Alaska Airlines
Find Deal
Wed, Nov 20
7:05 pm - 12:28 amSEA-ONT
5h 23m1 stop
$68Delta
Find Deal
Thu, Jan 2
10:00 am - 5:04 pmSEA-ONT
7h 04m1 stop
$78Alaska Airlines
Find Deal
Tue, Feb 11
7:45 pm - 9:59 amSEA-ONT
14h 14m1 stop
Sun, Nov 10
5:36 am - 9:53 amSEA-ONT
4h 17m1 stop
$133United Airlines
Find Deal
Sun, Nov 24
5:36 am - 9:53 amSEA-ONT
4h 17m1 stop
$138United Airlines
Find Deal
Sun, Nov 10
7:14 pm - 9:59 pmSEA-ONT
2h 45mnonstop
7:58 am - 10:54 amONT-SEA
2h 56mnonstop
$176Frontier
Find Deal
Sun, Nov 3 - Thu, Nov 7
7:14 pm - 9:59 pmSEA-ONT
2h 45mnonstop
12:38 pm - 3:34 pmONT-SEA
2h 56mnonstop
$178Frontier
Find Deal
Sun, Nov 3 - Sat, Nov 9
7:27 pm - 10:09 pmSEA-ONT
2h 42mnonstop
11:20 am - 7:15 amONT-SEA
19h 55m1 stop
$185Frontier
Find Deal
Fri, Nov 1 - Tue, Nov 12
7:27 pm - 10:09 pmSEA-ONT
2h 42mnonstop
11:29 am - 2:18 pmONT-SEA
2h 49mnonstop
Mon, Nov 4 - Wed, Nov 6
3:02 pm - 5:35 pmSEA-ONT
2h 33mnonstop
6:00 am - 8:53 amONT-SEA
2h 53mnonstop
$277Alaska Airlines
Find Deal
Fri, Nov 1 - Sat, Dec 7
11:15 am - 1:57 pmSEA-ONT
2h 42mnonstop
5:40 am - 8:40 amONT-SEA
3h 00mnonstop
$287Delta
Find Deal
Tue, Nov 5 - Thu, Nov 21
8:00 am - 10:33 amSEA-ONT
2h 33mnonstop
4:15 pm - 7:00 pmONT-SEA
2h 45mnonstop
$317Alaska Airlines
Find Deal
Tue, Nov 5 - Tue, Nov 19
7:30 am - 2:30 pmSEA-ONT
7h 00m1 stop
12:20 pm - 11:00 pmONT-SEA
10h 40m1 stop
$339Southwest
Find Deal
Mon, Nov 4 - Wed, Nov 6
6:55 pm - 11:25 pmSEA-ONT
4h 30m1 stop
5:10 am - 6:10 pmONT-SEA
13h 00m1 stop
$370Southwest
Find Deal
Fri, Nov 1 - Sat, Nov 2
7:55 pm - 10:39 pmSEA-ONT
2h 44mnonstop
5:26 pm - 8:23 pmONT-SEA
2h 57mnonstop
$389Delta
Find Deal
Mon, Nov 4 - Wed, Nov 6
7:10 pm - 9:50 pmSEA-ONT
2h 40mnonstop
7:58 am - 10:54 amONT-SEA
2h 56mnonstop
$56Frontier
Find Deal
Thu, Nov 21 - Thu, Nov 28
7:10 pm - 9:50 pmSEA-ONT
2h 40mnonstop
7:58 am - 10:54 amONT-SEA
2h 56mnonstop
$57Frontier
Find Deal
Thu, Nov 21 - Tue, Nov 26
6:35 pm - 9:15 pmSEA-ONT
2h 40mnonstop
7:58 am - 10:54 amONT-SEA
2h 56mnonstop
$58Frontier
Find Deal
Fri, Nov 22 - Thu, Nov 28
7:10 pm - 9:50 pmSEA-ONT
2h 40mnonstop
7:58 am - 10:54 amONT-SEA
2h 56mnonstop
$59Frontier
Find Deal
Thu, Nov 21 - Tue, Nov 26
7:10 pm - 9:50 pmSEA-ONT
2h 40mnonstop
6:00 am - 8:53 amONT-SEA
2h 53mnonstop
Thu, Nov 21 - Wed, Dec 4
9:26 pm - 11:59 pmSEA-ONT
2h 33mnonstop
6:00 am - 8:53 amONT-SEA
2h 53mnonstop
$117Alaska Airlines
Find Deal
Fri, Dec 6 - Mon, Dec 9
7:55 pm - 10:40 pmSEA-ONT
2h 45mnonstop
7:45 am - 10:45 amONT-SEA
3h 00mnonstop
$118Delta
Find Deal
Sat, Feb 8 - Fri, Feb 14
8:25 am - 11:02 amSEA-ONT
2h 37mnonstop
6:00 am - 8:50 amONT-SEA
2h 50mnonstop
$127Alaska Airlines
Find Deal
Sat, Mar 1 - Tue, Mar 4
4:24 pm - 7:04 pmSEA-ONT
2h 40mnonstop
11:29 am - 2:18 pmONT-SEA
2h 49mnonstop
Sat, Nov 16 - Wed, Nov 20
7:55 pm - 10:42 pmSEA-ONT
2h 47mnonstop
5:50 am - 8:55 amONT-SEA
3h 05mnonstop
$147Delta
Find Deal
Sat, Dec 7 - Sun, Dec 8

Flights from Seattle to Ontario - Travel Insights & Trends

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.

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

The average price of all flights from Seattle to Ontario clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from Seattle to Ontario, look for departures on Tuesdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Ontario, Wednesday is the cheapest day to fly and Sunday is 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 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 $134 on average. On the other hand, the most expensive months are December and April, where the average cost of tickets is $273 and $261 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for 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 month.
To get a below average price on the flight from Seattle to Ontario, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 100 days before departure.

Good to know

Low season

January

High season

June

Cheapest flight

$28
Best time to beat the crowds with an average 3% drop in price.
Most popular time to fly and prices are also 16% 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.

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 $28 for a one-way ticket and $56 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, Delta, American Airlines, and JetBlue offer inflight Wi-Fi service on the Seattle to Ontario flight route.

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

    The Boeing 737-800 Passenger/BBJ2 (winglets) 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 $265 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 $265 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.

See more FAQs

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 $88 or less one-way and $118 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.
See more tips

Prefer to fly non-stop 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.

Nonstop departures

Seattle/Tacoma Intl to Ontario

Monday

Alaska Airlines, Delta, Frontier, +6 more

Alaska Airlines, Delta, +7 more

Tuesday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Wednesday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 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

Ontario to Seattle/Tacoma Intl

Monday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Tuesday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Wednesday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Thursday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Friday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Saturday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

Sunday

Alaska Airlines, Delta, Frontier, +7 more

Alaska Airlines, Delta, +8 more

See more direct flights
See more direct flights

Top 4 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 9420 reviews
8.6Crew
8.2Boarding
7.2Food
7.1Entertainment
7.9Comfort
Airline reviews

Cathay Pacific is an excellent, well-maintained airline. While I too would love to fly first, or business class, I did not. I actually had the dreaded middle seat in the middle row, and yet, since I am an inquisitive traveler, I introduced myself to my row mates and had nice chats with both until lights out. Pro tip: Bring a donut travel pillow no matter where your seat is! The flight was smooth, the restrooms clean and the staff courteous and efficient. I gave the comfort level a 4 because of the reasons listed above. The airline meals... let's face it ... it's airplane food but CP does a good job in making it as edible as possible.

10.0 ExcellentAnonymous, Oct 2024SEA - SFO
Read more Alaska Airlines reviews

Cathay Pacific is an excellent, well-maintained airline. While I too would love to fly first, or business class, I did not. I actually had the dreaded middle seat in the middle row, and yet, since I am an inquisitive traveler, I introduced myself to my row mates and had nice chats with both until lights out. Pro tip: Bring a donut travel pillow no matter where your seat is! The flight was smooth, the restrooms clean and the staff courteous and efficient. I gave the comfort level a 4 because of the reasons listed above. The airline meals... let's face it ... it's airplane food but CP does a good job in making it as edible as possible.

I was not able to figure out how to get the entertainment. But the flight was smooth and quick.

Lots of turbulence in last 45 minutes, but captain kept us very well informed, which was a big help to a nervous flyer.

It was unexpected not to board with a jet bridge - the weather was good that day so it was not an issue. It was completely unclear what boarding group was called...there was no monitor with that info.

This flight had mechanical issues. I changed flights, which Alaska Customer Service handled beautifully. Then that flight was an hour late. I was originally supposed to land in San Diego at 730pm and I landed at midnight,

First class food and service was excellent. When I booked the ticket my outbound was automatically upgraded to a non bulkhead aisle seat which was much appreciated. However, my return was not. By the time I upgraded only windows on the bulkhead were remaining. It would have been nice if my seat was automatically upgraded within the appropriate advance time window so I didn't have to worry about it. (Not a big deal)

more time in layover in seattle because security for passport is a very long line

Flight delay. Didn’t receive seat assignments til last minute and partner wasn’t seated together

I was surprised by the lack of customer service from Alaska. While away I had a family emergency and called salsa to push my flight one day to lend family support and what I was met with by the customer service agent couldn’t have been any worse. Not only did this woman have zero compassion but she could barely contain her sheer disdain for her job but she gave new meaning to bad customer service. All I wanted was to find a way to move my flight by one day- she offered zero solutions other than to pay for a full fare new ticket. This experience has left me with never doing business with Alaska again. 👎

It was difficult because me and my husband weee seated separately not only us but other families too. Everyone asking each other to trading seats. Other then that it was good.

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.

It was NOT pleasant. Started from checking our luggage to the last time getting off the plane. The crew was not friendly, the food was horrible and the seats were too close to each other that I got a bruise on my knee.

Late departure due to large number of wheel chair patrons. Used to having a box of snacks to select from in comfort plus. The flight attendant just rattled off what was available and asked us to pick. Felt rushed and uncomfortable. Seat was great. Prefer having the screen on the seat in front of me instead of having to pull it up from the seat side. Lots of room for my carryon under the seat in front of me.

AC barely worked on a 50 minute flight. It was very warm the whole flight. Flight was very bumpy and hard landing.

Got on the plane and then needed to deboard the plane because they didn’t have any pilots?

The flight was canceled two hours before departure, it took over five hours to rebook us on another flight.

Rough day of travel all the way around. Wrong info given to us multiple times and mistakes in their booking making our trip 10 hours longer than planned. I’m bummed because I fly Delta all the time and love them. Mistakes happen. Just bummed that this was a rare trip our whole family was traveling together.

Paid extra for a “comfy seat” which was anything but!

It was cancelled unexpectedly so we rented a car and drove home.

Everything that was available was excellent. Spacious and comfortable, with lovely and helpful crew (one was having a bit of a sour day, but that happens). We sat on the tarmac for one hour and seven minutes waiting for our gate to clear in SAN, but the pilot kept us informed and, amazingly, was very professional in not ragging on the airport (whose fault it was).

Flight was delayed 8 hours so far. Don’t expect to fly when choosing Spirit Airlines. I will happily pay more to never deal with this company again.

This airline is effective for the price you pay, do not expect anything extra at all. You have to pay extra for seat assignment , carry on luggage, food, you name it ...and even if you pay extra for better seats they do not recline.

Got on quickly and easily. When it turned out the other two seats in my row would be occupied, a nearby flight attendant immediately let me know that I could move one row behind me since it was an empty row, I moved into the window seat where I could relax enough to take a little nap. Can’t ask for much more.

Awful. My flight was three hours late leaving DFW and we just arrived at LAX three hours late and stuck on the runway. I heard the Spirit workers at the desk in DFW say that we were waiting on a crew. I am extremely disappointed in Spirit.

Canceled my first flight for no discernible reason and couldn't rebook me on to a new flight until the next day. They did not compensate me for the delay in any way.

At LAS airport, bag drop process was hard, you need to pay for a faster drop. There was a long line for a free drop and you need to do it by yourself. No one helped you. Bad experience at LAS airport.

Terrible airline. Cancelled the flight less than 24 hours before the flight. Caused me extra expenses!!! This will be the last time me and my family will travel with them

Stop changing gates at sfo. When you are elderly going back for it’s not fun.

We understand and comply with Frontier’s bag sizes. We’ve had some problems in past while having to await other passengers who do not understand the baggage restrictions or have not prepaid and that is usually our biggest concern (others delaying us) with flying Frontier. Flying OUT of ONT, however, has always been a great experience. I’ve also noted even on delayed Frontier flights very knowledgeable pilots who manage expectations well.

There was no easy way to check in. I don't want to install an app to checkin. I will use alaska from now on because they have a web check in method that is easy.

The crew was ghetto lol I felt like I was on an inner city field trip

Horrible! The short distance flight ended up taking 5 hrs! There was a 3 hr delay for the flight to take off and there was a 70 min wait on the tarmac for some bogus reason that the pilot said the gate he was supposed to board was taken up. After a 30 min wait he said the plane that was supposed to push out of the gate called a medical emergency and 40 min later he ended up boarding another gate. For the initial 3 hr delay there was no information/alert about the gate or delay in the app or the boards up until the boarding time and even beyond! Had to walk all the way to the end of the terminal to find the frontier staff to ask what was going on. Avoid this airline at all costs! If you have carryon bags or checked bags , their prices come equivalent to the prices of more reliable airlines. They are the worst in timeliness at 60% (reported as delayed) this year (check the data) by a high margin even compared to the second worst airline. If you are ok with having a miserable flight experience with the odds close to flip of a coin, feel free to try them. If you value your time , money and flying experience, stay away.

There was nothing to like, flight delayed had to move to different departure areas, disorganized to say the leasr

Delayed for two hours due to trivial issues. No reimbursment. Also on arrival further delay due to terminal malfunction.

I went to the Frontier counter in San Jose at 1030am or so on Sunday 10/13/24 to see if I could get an earlier flight to San Diego in lieu of my reserved 630pm flight. One thing led to another, and I was able to obtain an open seat for about $ 56. on the earlier flight. Fine. Then the agent asked if I "was checking a bag". Not knowing that carry-ons cost extra per Frontier policy, I thought that she meant a regular checked bag. Therefore, I said no. Once I got to the gate, the same gate agent who sold me a ticket told me that I had to pay $99 for a carry-on, and that all bags were extra on Frontier. Having never flown on Frontier, I was not aware of this. Part of the issue was that she was not a native English speaker, so there was a miscommunication as to what "bag" meant. I would have preferred for her to have clearly let me know at the front counter that any bag including a carry-on cost $99. It would have had the same outcome, as I had to take my carry-on. But it got hectic at the last minute at the gate itself. The baggage policy should have mentioned "including carry-ons" when we first spoke.

Most horrible airlines. Please avoid it. It's ok to spend $50 extra for delta, united or Alaska

The trip was good but the last minute changes I didn’t like because I had already talked to the attendee and they didn’t help me with my ticket I was having trouble checking in and when the time was up they help me but charge me for that and last minute luggage it was a small bag. After I was in the airplane I realized you were charging because the flight was almost empty and you have to get the money some how. Thanks for everything.

Book cheap flights from Seattle to Ontario

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Seattle to Ontario found on KAYAK in the last 72 hours.
11/23Sat
nonstopFrontier
2h 40mSEA-ONT
$28
12/17Tue
nonstopFrontier
2h 38mSEA-ONT
$29
11/22Fri
nonstopFrontier
2h 40mSEA-ONT
$32
12/14Sat
nonstopDelta
2h 47mSEA-ONT
$59
11/20Wed
1 stopAlaska Airlines
5h 14mSEA-ONT
$61
1/2Thu
1 stopDelta
5h 23mSEA-ONT
$68
2/11Tue
1 stopAlaska Airlines
7h 04mSEA-ONT
$78
11/10Sun
1 stop
14h 14mSEA-ONT
$102
11/24Sun
1 stopUnited Airlines
4h 17mSEA-ONT
$133
11/10Sun
1 stopUnited Airlines
4h 17mSEA-ONT
$138

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Last minute flights from Seattle to Ontario

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 Seattle to Ontario that are departing in the next 10 days.
11/3Sun
nonstopFrontier
2h 45mSEA-ONT
11/7Thu
nonstopFrontier
2h 56mONT-SEA
$176
11/3Sun
nonstopFrontier
2h 45mSEA-ONT
11/9Sat
nonstopFrontier
2h 56mONT-SEA
$178
11/1Fri
nonstopFrontier
2h 42mSEA-ONT
11/12Tue
multi-stopFrontier
19h 55mONT-SEA
$185
11/4Mon
nonstop
2h 42mSEA-ONT
11/6Wed
nonstop
2h 49mONT-SEA
$243
11/1Fri
nonstopAlaska Airlines
2h 33mSEA-ONT
12/7Sat
nonstopAlaska Airlines
2h 53mONT-SEA
$277
11/5Tue
nonstopDelta
2h 42mSEA-ONT
11/21Thu
nonstopDelta
3h 00mONT-SEA
$287
11/5Tue
nonstopAlaska Airlines
2h 33mSEA-ONT
11/19Tue
nonstopAlaska Airlines
2h 45mONT-SEA
$317
11/4Mon
multi-stopSouthwest
7h 00mSEA-ONT
11/6Wed
multi-stopSouthwest
10h 40mONT-SEA
$339
11/1Fri
multi-stopSouthwest
4h 30mSEA-ONT
11/2Sat
multi-stopSouthwest
13h 00mONT-SEA
$370
11/4Mon
nonstopDelta
2h 44mSEA-ONT
11/6Wed
nonstopDelta
2h 57mONT-SEA
$389

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

Information on your arrival and departure airports