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Cheap flights from Seattle to Ontario from C$ 99

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 21/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

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Find the cheapest flights from Seattle to Los Angeles

Cheap round-trip flights

These are some of the best round-trip flight deals from Seattle to Los Angeles that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from Seattle to Los Angeles.

Cheap last-minute flights

Planning a quick getaway from Seattle to Los Angeles? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Los Angeles, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from Seattle to Los Angeles

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

All round-trip flight deals to Los Angeles

The cheapest plane tickets to Los Angeles found on KAYAK recently.
12:52 p.m. - 3:29 p.m.SEA-ONT
2h 37mdirect
10:21 a.m. - 1:12 p.m.ONT-SEA
2h 51mdirect
C$ 154Frontier
Find Deal
Sun, 16 Mar - Sun, 23 Mar
8:00 a.m. - 10:49 a.m.SEA-ONT
2h 49mdirect
4:06 p.m. - 6:59 p.m.ONT-SEA
2h 53mdirect
C$ 197Alaska Airlines
Find Deal
Tue, 28 Jan - Tue, 28 Jan
8:00 a.m. - 10:38 a.m.SEA-ONT
2h 38mdirect
5:44 p.m. - 10:00 p.m.ONT-SEA
4h 16m1 stop
C$ 210Alaska Airlines
Find Deal
Wed, 15 Jan - Sat, 18 Jan
7:45 p.m. - 10:32 p.m.SEA-ONT
2h 47mdirect
6:00 a.m. - 8:55 a.m.ONT-SEA
2h 55mdirect
C$ 214Delta
Find Deal
Sat, 18 Jan - Sun, 19 Jan
12:50 p.m. - 6:04 p.m.SEA-ONT
5h 14m1 stop
10:47 a.m. - 3:45 p.m.ONT-SEA
4h 58m1 stop
C$ 274United Airlines
Find Deal
Tue, 14 Jan - Fri, 17 Jan
12:40 p.m. - 3:25 p.m.SEA-ONT
2h 45mdirect
6:00 a.m. - 8:55 a.m.ONT-SEA
2h 55mdirect
C$ 285Delta
Find Deal
Fri, 10 Jan - Sun, 12 Jan
7:45 p.m. - 10:32 p.m.SEA-ONT
2h 47mdirect
6:00 a.m. - 8:55 a.m.ONT-SEA
2h 55mdirect
C$ 290Delta
Find Deal
Sat, 18 Jan - Tue, 21 Jan
12:50 p.m. - 6:04 p.m.SEA-ONT
5h 14m1 stop
6:15 a.m. - 11:20 a.m.ONT-SEA
5h 05m1 stop
C$ 323United Airlines
Find Deal
Wed, 29 Jan - Mon, 3 Feb
3:15 p.m. - 9:45 p.m.SEA-ONT
6h 30m2 stops
3:50 p.m. - 11:20 p.m.ONT-SEA
7h 30m1 stop
C$ 519Southwest
Find Deal
Fri, 31 Jan - Mon, 3 Feb
5:40 a.m. - 12:20 p.m.SEA-ONT
6h 40m1 stop
5:35 a.m. - 12:20 p.m.ONT-SEA
6h 45m1 stop
C$ 526Southwest
Find Deal
Thu, 2 Jan - Sun, 5 Jan
8:00 a.m. - 10:49 a.m.SEA-ONT
2h 49mdirect
C$ 99Alaska Airlines
Find Deal
Tue, 21 Jan
4:35 p.m. - 7:14 p.m.SEA-ONT
2h 39mdirect
C$ 106Frontier
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Thu, 9 Jan
11:36 a.m. - 5:04 p.m.SEA-ONT
5h 28m1 stop
C$ 112Alaska Airlines
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Tue, 4 Feb
7:45 p.m. - 10:32 p.m.SEA-ONT
2h 47mdirect
C$ 114Delta
Find Deal
Fri, 24 Jan
12:50 p.m. - 6:04 p.m.SEA-ONT
5h 14m1 stop
C$ 126United Airlines
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Tue, 21 Jan
9:36 p.m. - 11:59 p.m.SEA-ONT
26h 23m1 stop
C$ 128Frontier
Find Deal
Sat, 4 Jan
12:50 p.m. - 8:29 p.m.SEA-ONT
7h 39m1 stop
C$ 177United Airlines
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Fri, 24 Jan
7:45 p.m. - 10:32 p.m.SEA-ONT
2h 47mdirect
C$ 193Delta
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Tue, 21 Jan
12:00 p.m. - 7:45 p.m.SEA-ONT
7h 45m1 stop
C$ 270Southwest
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Sat, 28 Dec
4:45 p.m. - 11:35 p.m.SEA-ONT
6h 50m2 stops
C$ 285Southwest
Find Deal
Thu, 2 Jan
9:21 p.m. - 11:59 p.m.SEA-ONT
2h 38mdirect
4:06 p.m. - 6:59 p.m.ONT-SEA
2h 53mdirect
C$ 456Alaska Airlines
Find Deal
Fri, 27 Dec - Sat, 1 Feb
9:21 p.m. - 11:59 p.m.SEA-ONT
2h 38mdirect
5:44 p.m. - 10:00 p.m.ONT-SEA
4h 16m1 stop
C$ 468Alaska Airlines
Find Deal
Fri, 27 Dec - Sat, 1 Feb
5:00 p.m. - 10:37 p.m.SEA-ONT
5h 37m1 stop
4:05 p.m. - 7:00 p.m.ONT-SEA
2h 55mdirect
C$ 524Delta
Find Deal
Tue, 24 Dec - Tue, 7 Jan
5:00 p.m. - 10:37 p.m.SEA-ONT
5h 37m1 stop
5:10 p.m. - 12:50 a.m.ONT-SEA
7h 40m1 stop
C$ 540Delta
Find Deal
Tue, 24 Dec - Tue, 7 Jan
5:00 a.m. - 9:58 a.m.SEA-ONT
4h 58m1 stop
6:15 a.m. - 11:20 a.m.ONT-SEA
5h 05m1 stop
C$ 616United Airlines
Find Deal
Thu, 26 Dec - Tue, 7 Jan
1:05 p.m. - 8:15 p.m.SEA-ONT
7h 10m1 stop
6:30 a.m. - 11:20 a.m.ONT-SEA
4h 50m1 stop
C$ 648Southwest
Find Deal
Thu, 26 Dec - Tue, 31 Dec
6:05 p.m. - 11:00 p.m.SEA-ONT
4h 55m1 stop
2:50 p.m. - 10:15 p.m.ONT-SEA
7h 25m2 stops
C$ 691Southwest
Find Deal
Mon, 23 Dec - Mon, 6 Jan
5:00 a.m. - 9:58 a.m.SEA-ONT
4h 58m1 stop
10:39 a.m. - 3:25 p.m.ONT-SEA
4h 46m1 stop
C$ 704United Airlines
Find Deal
Thu, 26 Dec - Mon, 6 Jan
9:36 p.m. - 11:59 p.m.SEA-ONT
26h 23m1 stop
4:26 p.m. - 7:26 p.m.ONT-SEA
3h 00mdirect
C$ 912Frontier
Find Deal
Mon, 23 Dec - Thu, 2 Jan
9:36 p.m. - 11:59 p.m.SEA-ONT
26h 23m1 stop
5:34 p.m. - 1:10 p.m.ONT-SEA
19h 36m1 stop
C$ 1,193Frontier
Find Deal
Mon, 23 Dec - Thu, 2 Jan
12:52 p.m. - 3:29 p.m.SEA-ONT
2h 37mdirect
10:21 a.m. - 1:12 p.m.ONT-SEA
2h 51mdirect
C$ 154Frontier
Find Deal
Sun, 16 Mar - Sun, 23 Mar
8:00 a.m. - 10:49 a.m.SEA-ONT
2h 49mdirect
4:06 p.m. - 6:59 p.m.ONT-SEA
2h 53mdirect
C$ 197Alaska Airlines
Find Deal
Tue, 28 Jan - Tue, 28 Jan
8:00 a.m. - 10:38 a.m.SEA-ONT
2h 38mdirect
6:00 a.m. - 8:54 a.m.ONT-SEA
2h 54mdirect
C$ 211Alaska Airlines
Find Deal
Wed, 15 Jan - Sun, 19 Jan
7:45 p.m. - 10:32 p.m.SEA-ONT
2h 47mdirect
6:00 a.m. - 8:55 a.m.ONT-SEA
2h 55mdirect
C$ 214Delta
Find Deal
Sat, 18 Jan - Sun, 19 Jan
12:40 p.m. - 3:11 p.m.SEA-ONT
2h 31mdirect
7:01 p.m. - 9:53 p.m.ONT-SEA
2h 52mdirect
C$ 217Alaska Airlines
Find Deal
Thu, 6 Feb - Thu, 6 Feb
3:40 p.m. - 6:13 p.m.SEA-ONT
2h 33mdirect
4:11 p.m. - 7:04 p.m.ONT-SEA
2h 53mdirect
C$ 226Alaska Airlines
Find Deal
Sat, 11 Jan - Sun, 12 Jan
8:38 p.m. - 11:12 p.m.SEA-ONT
2h 34mdirect
6:00 a.m. - 8:54 a.m.ONT-SEA
2h 54mdirect
C$ 254Alaska Airlines
Find Deal
Sun, 12 Jan - Tue, 14 Jan
12:40 p.m. - 3:25 p.m.SEA-ONT
2h 45mdirect
4:05 p.m. - 7:00 p.m.ONT-SEA
2h 55mdirect
C$ 269Delta
Find Deal
Fri, 10 Jan - Sat, 11 Jan
12:40 p.m. - 3:11 p.m.SEA-ONT
2h 31mdirect
11:33 a.m. - 2:24 p.m.ONT-SEA
2h 51mdirect
C$ 283Alaska Airlines
Find Deal
Fri, 10 Jan - Sun, 12 Jan
12:40 p.m. - 3:25 p.m.SEA-ONT
2h 45mdirect
6:00 a.m. - 8:55 a.m.ONT-SEA
2h 55mdirect
C$ 285Delta
Find Deal
Fri, 10 Jan - Sun, 12 Jan

Delta flights from Seattle to Ontario

Our best Delta deals on Seattle to Ontario flight tickets
Delta
18 Jan
SEA7:45 p.m.Seattle/Tacoma Intl
2h 47m
ONT10:32 p.m.Ontario
19 Jan
ONT6:00 a.m.Ontario
2h 55m
SEA8:55 a.m.Seattle/Tacoma Intl
Delta
4 Jan
SEA2:47 p.m.Seattle/Tacoma Intl
2h 40m
ONT5:27 p.m.Ontario
13 Jan
ONT4:05 p.m.Ontario
2h 55m
SEA7:00 p.m.Seattle/Tacoma Intl
Delta
10 Jan
SEA12:40 p.m.Seattle/Tacoma Intl
2h 45m
ONT3:25 p.m.Ontario
12 Jan
ONT6:00 a.m.Ontario
2h 55m
SEA8:55 a.m.Seattle/Tacoma Intl

Alaska Airlines flights from Seattle to Ontario

Our best Alaska Airlines deals on Seattle to Ontario flight tickets
Alaska Airlines
28 Jan
SEA8:00 a.m.Seattle/Tacoma Intl
2h 49m
ONT10:49 a.m.Ontario
28 Jan
ONT4:06 p.m.Ontario
2h 53m
SEA6:59 p.m.Seattle/Tacoma Intl
Alaska Airlines
15 Jan
SEA8:00 a.m.Seattle/Tacoma Intl
2h 38m
ONT10:38 a.m.Ontario
18 Jan
ONT5:44 p.m.Ontario
4h 16m
1 stop
SEA10:00 p.m.Seattle/Tacoma Intl
Alaska Airlines
15 Jan
SEA8:00 a.m.Seattle/Tacoma Intl
2h 38m
ONT10:38 a.m.Ontario
19 Jan
ONT6:00 a.m.Ontario
2h 54m
SEA8:54 a.m.Seattle/Tacoma Intl

See travel insights to Los Angeles from

How to get the cheapest flight ticket from Seattle to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Ontario?

The month of September is, on average, the cheapest month to fly to Ontario from Seattle, with most prices found around C$ 190. The month of August is another great option to travel to Ontario, with average flight prices from Seattle averaging around C$ 226.

What is the cheapest day to depart on your flight to Ontario?

On average, the least expensive day to fly to Ontario from Seattle is on a Monday. momondo users have found tickets for Monday departures for as low as C$ 0. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 316.

What is the cheapest time of day to depart on your flight to Ontario?

Our data shows that the cheapest Seattle to Ontario flights are usually those with departure times at noon. Our users have found flights to Ontario at noon for as low as C$ 119. Try not to purchase tickets in the evening because they tend to be around C$ 311. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Seattle/Tacoma Intl to Ontario flight route?

Fly from Seattle/Tacoma Intl to Ontario for the best Seattle/Tacoma Intl - Ontario flight prices

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

The best time to book a flight to Ontario from Seattle is 44 days out, which is when prices tend to be around C$ 290. However, in the past 72 hours, people saw flights from Seattle for as low as C$ 281.

What cabin class options are available on Seattle/Tacoma Intl to Ontario flights?

There are 1 cabin classes available to choose from on Seattle/Tacoma Intl to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to Ontario flights?

You could potentially save up to 20% on your flight if you consider stops on a Seattle to Ontario flight.

How have Seattle to Ontario flight prices changed over time?

As of December 2024, prices for Seattle to Ontario flights are approximately 36% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Ontario (SEA to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Ontario

Best price found

C$ 99

Fastest flight time

2h 31m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Seattle in the past 72 hours is C$ 99. The best round-trip flight deal from Seattle to Ontario found on momondo in the last 72 hours is C$ 154.
The fastest flight from Seattle to Ontario takes 2h 31m
Direct flights go from Seattle to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)

  • How far is Seattle/Tacoma Intl to Ontario by plane?

    A flight from Seattle/Tacoma Intl to Ontario will travel around 1555.6 km. Flights usually cover this in 2h 31m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Ontario Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Ontario Airport refresh daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Ontario Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Ontario Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Seattle to Ontario?

  • What is the most popular airline from Seattle to Ontario?


Best airlines flying from Seattle to Ontario

Compare and see reviews for airlines that fly from Seattle to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom C$ 82Free CancellationRating
6.1
3,472 reviews
Search Frontier flights
Alaska AirlinesPriceFrom C$ 156Free CancellationRating
8.0
9,537 reviews
Search Alaska Airlines flights
DeltaPriceFrom C$ 196Free CancellationRating
8.0
8,594 reviews
Search Delta flights
  • Alaska Airlines Flights From Seattle to Ontario

    Across 20 Alaska Airlines flights from Seattle to Ontario this week, the average price was C$ 221, with the best Alaska Airlines deals starting from C$ 108 round-trip. 9,537 users have rated Alaska Airlines on momondo, with an average score of 8.0/10.

  • Delta Flights From Seattle to Ontario

    Delta (8.0/10 from 8,594 reviews) operates around 10 flights from Seattle to Ontario in any given week. The average Delta airfare for this route is around C$ 226, with deals from around C$ 136 rare but found on momondo. Referenced prices are for round-trip Seattle to Ontario flight searches in the last 72 hours.


Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Ontario?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Seattle.

Can I find flights from Seattle to Ontario with flexible booking policies on momondo?

momondo does allow users to show only those flights to Ontario from Seattle which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Seattle to Ontario?

momondo provides multiple filters to help you find the best flight to Ontario from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Seattle to Ontario right now. Can momondo alert me if prices change?

Price alerts on flights to Ontario from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.


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