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Cheap flights from Seattle to Ontario from $38

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 4/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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 pm - 3:29 pmSEA-ONT
2h 37mnonstop
10:21 am - 1:12 pmONT-SEA
2h 51mnonstop
$96Frontier
Find Deal
Thu, Mar 20 - Sun, Mar 23
4:35 pm - 7:12 pmSEA-ONT
2h 37mnonstop
11:27 am - 2:18 pmONT-SEA
2h 51mnonstop
$98Frontier
Find Deal
Thu, Jan 23 - Thu, Jan 30
8:00 am - 10:49 amSEA-ONT
2h 49mnonstop
11:33 am - 2:24 pmONT-SEA
2h 51mnonstop
$123Alaska Airlines
Find Deal
Tue, Jan 21 - Wed, Jan 29
8:00 am - 10:49 amSEA-ONT
2h 49mnonstop
12:34 pm - 9:40 amONT-SEA
21h 06m1 stop
Tue, Jan 21 - Wed, Jan 29
4:35 pm - 7:12 pmSEA-ONT
2h 37mnonstop
4:06 pm - 6:59 pmONT-SEA
2h 53mnonstop
Thu, Jan 30 - Fri, Jan 31
5:40 pm - 8:13 pmSEA-ONT
2h 33mnonstop
11:33 am - 2:24 pmONT-SEA
2h 51mnonstop
$136Alaska Airlines
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Wed, Feb 5 - Wed, Feb 12
7:45 pm - 10:32 pmSEA-ONT
2h 47mnonstop
6:00 am - 8:55 amONT-SEA
2h 55mnonstop
$148Delta
Find Deal
Sat, Jan 18 - Sun, Jan 19
7:45 pm - 10:32 pmSEA-ONT
2h 47mnonstop
6:00 am - 8:55 amONT-SEA
2h 55mnonstop
$149Delta
Find Deal
Sat, Jan 18 - Sun, Jan 19
6:10 am - 11:58 amSEA-ONT
5h 48m1 stop
6:10 am - 2:02 pmONT-SEA
7h 52m1 stop
$160American Airlines
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Wed, Feb 5 - Wed, Feb 12
6:10 am - 11:58 amSEA-ONT
5h 48m1 stop
6:10 am - 2:02 pmONT-SEA
7h 52m1 stop
$261American Airlines
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Sat, Jan 11 - Tue, Jan 14
12:46 pm - 3:25 pmSEA-ONT
2h 39mnonstop
$38Frontier
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Thu, Apr 3
12:52 pm - 3:29 pmSEA-ONT
2h 37mnonstop
$39Frontier
Find Deal
Mon, Mar 10
8:00 am - 10:49 amSEA-ONT
2h 49mnonstop
$61Alaska Airlines
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Tue, Jan 21
8:00 am - 10:49 amSEA-ONT
2h 49mnonstop
$67Alaska Airlines
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Tue, Feb 4
7:45 pm - 10:32 pmSEA-ONT
2h 47mnonstop
$70Delta
Find Deal
Tue, Jan 14
6:10 am - 11:58 amSEA-ONT
5h 48m1 stop
$80American Airlines
Find Deal
Wed, Feb 5
6:10 am - 11:58 amSEA-ONT
5h 48m1 stop
$118American Airlines
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Wed, Jan 15
12:40 pm - 3:25 pmSEA-ONT
2h 45mnonstop
$119Delta
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Mon, Jan 6
12:50 pm - 6:04 pmSEA-ONT
5h 14m1 stop
$123United Airlines
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Wed, Jan 15
12:50 pm - 6:04 pmSEA-ONT
5h 14m1 stop
$125United Airlines
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Tue, Jan 14
7:01 pm - 9:39 pmSEA-ONT
2h 38mnonstop
11:26 am - 2:25 pmONT-SEA
2h 59mnonstop
$244Frontier
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Tue, Dec 24 - Thu, Jan 9
9:36 pm - 11:59 pmSEA-ONT
26h 23m1 stop
12:34 pm - 9:47 amONT-SEA
21h 13m1 stop
$289Frontier
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Sat, Dec 28 - Wed, Jan 8
5:30 pm - 8:15 pmSEA-ONT
2h 45mnonstop
4:05 pm - 7:00 pmONT-SEA
2h 55mnonstop
$342Delta
Find Deal
Wed, Dec 25 - Wed, Jan 8
9:21 pm - 11:59 pmSEA-ONT
2h 38mnonstop
6:00 am - 8:54 amONT-SEA
2h 54mnonstop
$367Alaska Airlines
Find Deal
Fri, Dec 27 - Wed, Jan 8
5:30 pm - 8:15 pmSEA-ONT
2h 45mnonstop
6:00 am - 8:55 amONT-SEA
2h 55mnonstop
$372Delta
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Wed, Dec 25 - Tue, Jan 7
9:21 pm - 11:59 pmSEA-ONT
2h 38mnonstop
7:01 pm - 9:52 pmONT-SEA
2h 51mnonstop
$392Alaska Airlines
Find Deal
Fri, Dec 27 - Mon, Jan 6
7:01 pm - 9:39 pmSEA-ONT
2h 38mnonstop
6:00 am - 8:56 amONT-SEA
2h 56mnonstop
Tue, Dec 24 - Sat, Dec 28
5:00 am - 9:58 amSEA-ONT
4h 58m1 stop
6:15 am - 1:32 pmONT-SEA
7h 17m1 stop
$416United Airlines
Find Deal
Sat, Dec 28 - Mon, Jan 13
6:52 pm - 9:31 pmSEA-ONT
2h 39mnonstop
10:40 am - 5:33 pmONT-SEA
6h 53m1 stop
Thu, Dec 26 - Mon, Dec 30
6:13 pm - 11:00 pmSEA-ONT
4h 47m1 stop
10:47 am - 3:45 pmONT-SEA
4h 58m1 stop
$461United Airlines
Find Deal
Thu, Dec 26 - Wed, Jan 8
12:52 pm - 3:29 pmSEA-ONT
2h 37mnonstop
10:21 am - 1:12 pmONT-SEA
2h 51mnonstop
$96Frontier
Find Deal
Thu, Mar 20 - Sun, Mar 23
4:35 pm - 7:14 pmSEA-ONT
2h 39mnonstop
11:27 am - 2:18 pmONT-SEA
2h 51mnonstop
$104Frontier
Find Deal
Thu, Jan 9 - Thu, Jan 16
4:35 pm - 7:12 pmSEA-ONT
2h 37mnonstop
11:27 am - 2:18 pmONT-SEA
2h 51mnonstop
$106Frontier
Find Deal
Thu, Feb 6 - Sun, Feb 9
12:52 pm - 3:29 pmSEA-ONT
2h 37mnonstop
10:21 am - 1:12 pmONT-SEA
2h 51mnonstop
$108Frontier
Find Deal
Thu, Feb 13 - Sun, Feb 16
8:00 am - 10:49 amSEA-ONT
2h 49mnonstop
11:33 am - 2:24 pmONT-SEA
2h 51mnonstop
$123Alaska Airlines
Find Deal
Tue, Jan 21 - Wed, Jan 29
4:35 pm - 7:14 pmSEA-ONT
2h 39mnonstop
7:01 pm - 9:53 pmONT-SEA
2h 52mnonstop
Thu, Jan 9 - Mon, Jan 13
5:40 pm - 8:13 pmSEA-ONT
2h 33mnonstop
11:33 am - 2:24 pmONT-SEA
2h 51mnonstop
$137Alaska Airlines
Find Deal
Tue, Jan 14 - Wed, Jan 15
8:05 pm - 10:39 pmSEA-ONT
2h 34mnonstop
11:27 am - 2:18 pmONT-SEA
2h 51mnonstop
Fri, Jan 24 - Sun, Jan 26
7:45 pm - 10:32 pmSEA-ONT
2h 47mnonstop
4:05 pm - 7:00 pmONT-SEA
2h 55mnonstop
$147Delta
Find Deal
Wed, Jan 15 - Thu, Jan 16
7:45 pm - 10:32 pmSEA-ONT
2h 47mnonstop
6:00 am - 8:55 amONT-SEA
2h 55mnonstop
$148Delta
Find Deal
Sat, Jan 18 - Sun, Jan 19

Delta flights from Seattle to Ontario

Our best Delta deals on Seattle to Ontario flight tickets
Delta
Jan 18
SEA7:45 pmSeattle/Tacoma Intl
2h 47m
ONT10:32 pmOntario
Jan 19
ONT6:00 amOntario
2h 55m
SEA8:55 amSeattle/Tacoma Intl
Delta
Jan 18
SEA7:45 pmSeattle/Tacoma Intl
2h 47m
ONT10:32 pmOntario
Jan 19
ONT6:00 amOntario
2h 55m
SEA8:55 amSeattle/Tacoma Intl
Delta
Feb 7
SEA7:45 pmSeattle/Tacoma Intl
2h 47m
ONT10:32 pmOntario
Feb 10
ONT6:00 amOntario
2h 55m
SEA8:55 amSeattle/Tacoma Intl

Alaska Airlines flights from Seattle to Ontario

Our best Alaska Airlines deals on Seattle to Ontario flight tickets
Alaska Airlines
Jan 21
SEA8:00 amSeattle/Tacoma Intl
2h 49m
ONT10:49 amOntario
Jan 29
ONT11:33 amOntario
2h 51m
SEA2:24 pmSeattle/Tacoma Intl
Alaska Airlines
Feb 5
SEA5:40 pmSeattle/Tacoma Intl
2h 33m
ONT8:13 pmOntario
Feb 12
ONT11:33 amOntario
2h 51m
SEA2:24 pmSeattle/Tacoma Intl
Alaska Airlines
Jan 21
SEA8:00 amSeattle/Tacoma Intl
2h 49m
ONT10:49 amOntario
Jan 28
ONT6:00 amOntario
2h 54m
SEA8:54 amSeattle/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?

In general, September is the cheapest month to fly from Seattle to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $132. If you aren’t able to travel during the month of September, then book flights to Ontario from Seattle during August instead. Flights to Ontario in August, while not as cheap as those in September, still average around $157.

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

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $176. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to Ontario for around $261.

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

At noon is the cheapest time of day to fly from Seattle to Ontario when you can find flight prices for as low as $135. Flying to Ontario at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $236 on average. Flights to Ontario from Seattle in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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?

Most flyers found that booking tickets 44 days in advance of their planned departure date is the best time to get cheap flights to Ontario. During this timeframe, flight prices are around $202. However, in the past 72 hours, people saw flights from Seattle for as low as $136.

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

There are 4 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 42% 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

$38

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 $38. The best round-trip flight deal from Seattle to Ontario found on momondo in the last 72 hours is $96.
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?

    The distance between Seattle/Tacoma Intl and Ontario is about 966.6 mi. A reasonable flight in good conditions will take 2h 31m.

  • 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 are refreshed on a daily basis.

  • 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?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, 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
Spirit AirlinesPriceFrom $40Free CancellationRating
6.3
8,113 reviews
Search Spirit Airlines flights
FrontierPriceFrom $55Free CancellationRating
6.1
3,469 reviews
Search Frontier flights
DeltaPriceFrom $117Free CancellationRating
8.0
8,588 reviews
Search Delta flights
Alaska AirlinesPriceFrom $123Free CancellationRating
8.0
9,549 reviews
Search Alaska Airlines flights
  • Delta Flights From Seattle to Ontario

    Delta flies from Seattle to Ontario around 12 times per week, with 8,588 momondo users rating the airline 8.0/10. The cheapest Delta deal from Seattle to Ontario in the last 72 hours was $117 (round-trip), much lower than the average airfare cost of $267 for Delta flights on this route.

  • Alaska Airlines Flights From Seattle to Ontario

    Alaska Airlines (8.0/10 from 9,555 reviews) operates around 18 flights from Seattle to Ontario in any given week. The average Alaska Airlines airfare for this route is around $270, with deals from around $123 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?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Ontario for you.

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

Yes. momondo allows you to filter the results for Seattle to Ontario flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between Seattle and Ontario by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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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