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Cheap flights from Seattle to Los Angeles from C$ 183

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:25 p.m. - 9:53 p.m.SEA  Seattle/Tacoma Intl-ONT Ontario
27h 28m1 stop Las Vegas Harry Reid Intl
Multiple Airlines Logo
8:59 p.m. - 11:51 p.m.ONT  Ontario-SEA Seattle/Tacoma Intl
2h 52mdirect
C$ 324Multiple Airlines
Tue, 22 Dec - Wed, 30 Dec
Alaska Airlines Logo
9:23 p.m. - 11:59 p.m.SEA  Seattle/Tacoma Intl-ONT Ontario
2h 36mdirect
Alaska Airlines Logo
8:59 p.m. - 11:51 p.m.ONT  Ontario-SEA Seattle/Tacoma Intl
2h 52mdirect
C$ 341Alaska Airlines
Tue, 22 Dec - Wed, 30 Dec
Delta Logo
8:11 p.m. - 10:59 p.m.SEA  Seattle/Tacoma Intl-ONT Ontario
2h 48mdirect
Delta Logo
7:00 a.m. - 10:05 a.m.ONT  Ontario-SEA Seattle/Tacoma Intl
3h 05mdirect
C$ 345Delta
Wed, 2 Dec - Sat, 5 Dec
Delta Logo
8:11 p.m. - 10:59 p.m.SEA  Seattle/Tacoma Intl-ONT Ontario
2h 48mdirect
Delta Logo
5:55 p.m. - 9:00 p.m.ONT  Ontario-SEA Seattle/Tacoma Intl
3h 05mdirect
C$ 345Delta
Tue, 1 Dec - Sat, 5 Dec
Alaska Airlines Logo
8:37 a.m. - 11:13 a.m.SEA  Seattle/Tacoma Intl-ONT Ontario
2h 36mdirect
Alaska Airlines Logo
6:00 a.m. - 8:57 a.m.ONT  Ontario-SEA Seattle/Tacoma Intl
2h 57mdirect
C$ 345Alaska Airlines
Wed, 2 Dec - Sat, 5 Dec
Delta Logo
2:30 p.m. - 5:15 p.m.SEA  Seattle/Tacoma Intl-ONT Ontario
2h 45mdirect
Delta Logo
7:00 a.m. - 10:05 a.m.ONT  Ontario-SEA Seattle/Tacoma Intl
3h 05mdirect
C$ 345Delta
Tue, 1 Dec - Tue, 8 Dec
Alaska Airlines Logo
1:33 p.m. - 4:05 p.m.SEA  Seattle/Tacoma Intl-ONT Ontario
2h 32mdirect
Alaska Airlines Logo
11:57 a.m. - 2:49 p.m.ONT  Ontario-SEA Seattle/Tacoma Intl
2h 52mdirect
C$ 345Alaska Airlines
Wed, 2 Dec - Tue, 8 Dec
Frontier Logo
10:50 a.m. - 1:38 p.m.SEA  Seattle/Tacoma Intl-ONT Ontario
2h 48mdirect
Frontier Logo
6:45 a.m. - 3:22 p.m.ONT  Ontario-SEA Seattle/Tacoma Intl
8h 37m1 stop Denver Intl
C$ 377Frontier
Thu, 19 Nov - Sun, 22 Nov
Frontier Logo
4:37 p.m. - 12:14 a.m.SEA  Seattle/Tacoma Intl-ONT Ontario
7h 37m1 stop Denver Intl
Frontier Logo
6:45 a.m. - 3:22 p.m.ONT  Ontario-SEA Seattle/Tacoma Intl
8h 37m1 stop Denver Intl
C$ 393Frontier
Sat, 21 Nov - Sun, 22 Nov
Frontier Logo
10:18 a.m. - 1:06 p.m.SEA  Seattle/Tacoma Intl-ONT Ontario
2h 48mdirect
Frontier Logo
6:45 a.m. - 3:22 p.m.ONT  Ontario-SEA Seattle/Tacoma Intl
8h 37m1 stop Denver Intl
C$ 421Frontier
Sat, 21 Nov - Sun, 22 Nov

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Delta flights from Seattle to Ontario

Our best Delta deals on Seattle to Ontario flight tickets
Delta
21 Dec
SEA7:50 p.m.Seattle/Tacoma Intl
2h 47m
ONT10:37 p.m.Ontario
23 Dec
ONT7:00 a.m.Ontario
3h 05m
SEA10:05 a.m.Seattle/Tacoma Intl
C$ 373
Delta
25 Dec
SEA8:25 a.m.Seattle/Tacoma Intl
2h 54m
ONT11:19 a.m.Ontario
30 Dec
ONT7:00 a.m.Ontario
3h 05m
SEA10:05 a.m.Seattle/Tacoma Intl
C$ 380
Delta
25 Dec
SEA8:25 a.m.Seattle/Tacoma Intl
2h 54m
ONT11:19 a.m.Ontario
31 Dec
ONT7:00 a.m.Ontario
3h 05m
SEA10:05 a.m.Seattle/Tacoma Intl
C$ 408

Alaska Airlines flights from Seattle to Ontario

Our best Alaska Airlines deals on Seattle to Ontario flight tickets
Alaska Airlines
22 Dec
SEA9:23 p.m.Seattle/Tacoma Intl
2h 36m
ONT11:59 p.m.Ontario
30 Dec
ONT8:59 p.m.Ontario
2h 52m
SEA11:51 p.m.Seattle/Tacoma Intl
C$ 341
Alaska Airlines
23 Dec
SEA9:23 p.m.Seattle/Tacoma Intl
2h 36m
ONT11:59 p.m.Ontario
29 Dec
ONT8:59 p.m.Ontario
2h 52m
SEA11:51 p.m.Seattle/Tacoma Intl
C$ 345
Alaska Airlines
9 Jan
SEA12:59 p.m.Seattle/Tacoma Intl
2h 34m
ONT3:33 p.m.Ontario
12 Jan
ONT10:57 a.m.Ontario
4h 04m
1 stop
SEA3:01 p.m.Seattle/Tacoma Intl
C$ 359

momondo Fare Finder

 
Use the filters below to find and compare flights from Seattle to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Tue 22/12

6:25 p.m.-9:53 p.m.

1 stop27h 28m

Ontario

Wed 30/12

8:59 p.m.-11:51 p.m.

Nonstop2h 52m

C$ 324

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Tue 22/12

9:23 p.m.-11:59 p.m.

Nonstop2h 36m

Ontario

Wed 30/12

8:59 p.m.-11:51 p.m.

Nonstop2h 52m

C$ 341

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Wed 2/12

8:11 p.m.-10:59 p.m.

Nonstop2h 48m

Ontario

Sat 5/12

7:00 a.m.-10:05 a.m.

Nonstop3h 05m

C$ 345

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Tue 1/12

8:11 p.m.-10:59 p.m.

Nonstop2h 48m

Ontario

Sat 5/12

5:55 p.m.-9:00 p.m.

Nonstop3h 05m

C$ 345

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Wed 2/12

8:37 a.m.-11:13 a.m.

Nonstop2h 36m

Ontario

Sat 5/12

6:00 a.m.-8:57 a.m.

Nonstop2h 57m

C$ 345

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Tue 1/12

2:30 p.m.-5:15 p.m.

Nonstop2h 45m

Ontario

Tue 8/12

7:00 a.m.-10:05 a.m.

Nonstop3h 05m

C$ 345
Quickest round-trip

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Wed 2/12

1:33 p.m.-4:05 p.m.

Nonstop2h 32m

Ontario

Tue 8/12

11:57 a.m.-2:49 p.m.

Nonstop2h 52m

C$ 345

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Thu 19/11

10:50 a.m.-1:38 p.m.

Nonstop2h 48m

Ontario

Sun 22/11

6:45 a.m.-3:22 p.m.

1 stop8h 37m

C$ 377

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Sat 21/11

4:37 p.m.-12:14 a.m.

1 stop7h 37m

Ontario

Sun 22/11

6:45 a.m.-3:22 p.m.

1 stop8h 37m

C$ 393

SeattleOntario

SEA Seattle/Tacoma Intl - ONT Ontario

SEAONT

Seattle/Tacoma Intl

Sat 21/11

10:18 a.m.-1:06 p.m.

Nonstop2h 48m

Ontario

Sun 22/11

6:45 a.m.-3:22 p.m.

1 stop8h 37m

C$ 421

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 typical price of a round-trip flight between Seattle and Ontario?

Prices are currently low for flights on this route.

Typical prices usually range from C$ 340 to C$ 580.
The lowest price recently found on this route was C$ 324.

What is the cheapest month to fly to Ontario?

The month of August is, on average, the cheapest month to fly to Ontario from Seattle, with most prices found around C$ 352. The month of May is another great option to travel to Ontario, with average flight prices from Seattle averaging around C$ 354.

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 Friday. momondo users have found tickets for Friday departures for as low as C$ 395. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday 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$ 503.

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 from Seattle to Ontario?

You are more likely to see cheaper flights to Ontario from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around C$ 411 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Seattle for as low as C$ 291 on momondo.

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

There are 2 cabin classes available to choose from on Seattle 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 33% 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 November 2026, prices for Seattle to Ontario flights are approximately 29% 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$ 183

Fastest flight time

2h 47m

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$ 183. The best round-trip flight deal from Seattle to Ontario found on momondo in the last 72 hours is C$ 324.
The fastest flight from Seattle to Ontario takes 2h 47m
Direct flights go from Seattle to Ontario every day.
There is 1 airport in Ontario. From Seattle there are direct flights to Ontario (ONT).
Search flight deals

Frequently asked questions about flying from Seattle to Ontario

  • 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 47m, 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$ 249Free CancellationRating
5.5
2,512 reviews
Search Frontier flights
Alaska AirlinesPriceFrom C$ 324Free CancellationRating
7.9
13,138 reviews
Search Alaska Airlines flights

  • Alaska Airlines Flights From Seattle to Ontario

    Across 9 Alaska Airlines flights from Seattle to Ontario this week, the average price was C$ 443, with the best Alaska Airlines deals starting from C$ 324 round-trip. 13,138 users have rated Alaska Airlines on momondo, with an average score of 7.9/10.

  • Frontier Flights From Seattle to Ontario

    Frontier (5.5/10 from 2,512 reviews) operates around 4 flights from Seattle to Ontario in any given week. The average Frontier airfare for this route is around C$ 437, with deals from around C$ 249 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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