Cheap flights from Ontario to Seattle from $89

Round-trip
1 adult
Economy
From?
To?
Tue 6/28
Tue 7/5

Deals available from 900+ travel sites.

Flight information for Ontario to Seattle
(ONT to SEA)

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

Best Price Found

$89

Fastest flight time

2h 41m

Direct flights

Mon, Wed, Fri, Sat and Sun

Airports in Seattle

3 airports
The best one-way flight to Seattle from Ontario in the past 72 hours is $89. The best round-trip flight deal from Ontario to Seattle found on momondo in the last 72 hours is $178.
The fastest flight from Ontario to Seattle takes 2h 41m
Direct flights go from Ontario to Seattle on Monday, Wednesday, Friday, Saturday and Sunday. The only airline offering direct flights is Alaska Airlines.
There are 3 airports near Seattle: Seattle King County/Boeing (BFI), Seattle Lake Union Spb (LKE), Seattle/Tacoma Intl (SEA)

How to get the cheapest flight ticket from Ontario to Seattle

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 from Ontario to Seattle?

October

The cheapest time of year to fly to Seattle from Ontario is October. Most expensive is December

What is the cheapest day to depart Ontario for Seattle?

Wednesday

The cheapest day of the week is typically Wednesday. The most expensive is typically Sunday

When is the cheapest time to fly from Ontario to Seattle?

in the evening

Ontario to Seattle flights are approximately 20% more expensive in the afternoon than in the evening

What is the cheapest airline that flies to Seattle from Ontario?

Juneyao Airlines

Alaska Airlines, Delta, and Frontier are the most popular carriers operating from Ontario to Seattle

What is the cheapest Ontario to Seattle flight route?

Ontario - Seattle/Tacoma Intl

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

How far in advance should you book Ontario to Seattle flights?

59 days before

The cheapest time to buy a flight from Ontario to Seattle is approximately 59 days to departure

When traveling from Ontario to Seattle, the most popular airport to fly into is Seattle/Tacoma Intl Airport. The majority of travelers flying into Seattle/Tacoma Intl Airport from Ontario are departing from Ontario Airport. You may be looking for an airport near Ontario Airport to depart from when traveling to Seattle and luckily, there are options! You can try Los Angeles Airport which is located in Los Angeles, Santa Ana J. Wayne/Orange Cnty Airport which is located in Santa Ana, or Burbank Bob Hope Airport which is located in Burbank. When traveling from Ontario, it is helpful to have an alternative airport to fly into when you land in Seattle. The nearest airport to Seattle/Tacoma Intl Airport is Everett Paine Field Airport which is located in Everett. The cheapest route from Ontario to Seattle is SNA — SEA with an average price of $126 RT during the month of June.

Los Angeles Airport (LAX) to Seattle/Tacoma Intl Airport (SEA)$178
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Ontario Airport (ONT) to Seattle/Tacoma Intl Airport (SEA)$178
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Santa Ana J. Wayne/Orange Cnty Airport (SNA) to Seattle/Tacoma Intl Airport (SEA)$126
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Burbank Bob Hope Airport (BUR) to Seattle/Tacoma Intl Airport (SEA)$182
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Santa Ana J. Wayne/Orange Cnty Airport (SNA) to Everett Paine Field Airport (PAE)$218
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Long Beach Municipal Airport (LGB) to Seattle/Tacoma Intl Airport (SEA)$198
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Easily compare round-trip flights from Ontario to Seattle

Below you can see the best fares for your round-trip flight route over the next three months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Ontario to Seattle by changing tabs
Multiple Airlines
Oct 15
ONT1:56 pmOntario
2h 44m
SEA4:40 pmSeattle/Tacoma Intl
Oct 26
SEA3:00 amSeattle/Tacoma Intl
2h 35m
ONT5:35 amOntario
Alaska Airlines
Sep 14
ONT4:30 pmOntario
2h 45m
SEA7:15 pmSeattle/Tacoma Intl
Sep 18
SEA2:00 amSeattle/Tacoma Intl
2h 35m
ONT4:35 amOntario
Delta
Oct 1
ONT6:06 amOntario
6h 32m
1 stop
SEA12:38 pmSeattle/Tacoma Intl
Oct 5
SEA4:15 amSeattle/Tacoma Intl
2h 45m
ONT7:00 amOntario
Multiple Airlines
Oct 2
ONT4:30 pmOntario
2h 45m
SEA7:15 pmSeattle/Tacoma Intl
Oct 5
SEA4:15 amSeattle/Tacoma Intl
2h 45m
ONT7:00 amOntario
Alaska Airlines
Nov 9
ONT7:05 amOntario
5h 36m
1 stop
SEA12:41 pmSeattle/Tacoma Intl
Nov 12
SEA2:00 amSeattle/Tacoma Intl
2h 35m
ONT4:35 amOntario
Multiple Airlines
Sep 14
ONT2:10 amOntario
2h 45m
SEA4:55 amSeattle/Tacoma Intl
Sep 17
SEA7:22 amSeattle/Tacoma Intl
2h 41m
ONT10:03 amOntario

Find the cheapest one-way flights from Ontario to Seattle

If you're looking for one-way flights from Ontario to Seattle, view some of our deals below provided by Alaska Airlines and Frontier
Alaska Airlines
Sep 13
ONT4:30 pmOntario
2h 45m
SEA7:15 pmSeattle/Tacoma Intl
Frontier
Aug 16
ONT9:09 amOntario
21h 03m
1 stop
SEA6:12 amSeattle/Tacoma Intl
Multiple Airlines
Aug 10
ONT2:28 pmOntario
16h 31m
1 stop
SEA6:59 amSeattle/Tacoma Intl

Search last-minute flights to Seattle from Ontario

Find and compare round-trip flight prices for your last-minute flight from Ontario to Seattle
Multiple Airlines
Jun 28
ONT5:53 pmOntario
10h 47m
1 stop
SEA4:40 amSeattle/Tacoma Intl
Jul 11
SEA5:30 pmSeattle/Tacoma Intl
11h 46m
1 stop
ONT5:16 amOntario
Alaska Airlines
Jul 3
ONT1:54 pmOntario
2h 38m
SEA4:32 pmSeattle/Tacoma Intl
Sep 18
SEA2:00 amSeattle/Tacoma Intl
2h 35m
ONT4:35 amOntario
Delta
Jul 3
ONT1:45 pmOntario
2h 42m
SEA4:27 pmSeattle/Tacoma Intl
Jul 6
SEA4:48 amSeattle/Tacoma Intl
2h 46m
ONT7:34 amOntario
Multiple Airlines
Jun 28
ONT5:53 pmOntario
12h 44m
1 stop
SEA6:37 amSeattle/Tacoma Intl
Jul 5
SEA5:30 pmSeattle/Tacoma Intl
9h 35m
1 stop
ONT3:05 amOntario
Multiple Airlines
Jun 28
ONT5:53 pmOntario
12h 44m
1 stop
SEA6:37 amSeattle/Tacoma Intl
Jul 7
SEA10:24 amSeattle/Tacoma Intl
2h 35m
ONT12:59 pmOntario
Alaska Airlines
Jul 3
ONT1:54 pmOntario
2h 38m
SEA4:32 pmSeattle/Tacoma Intl
Jul 6
SEA2:00 amSeattle/Tacoma Intl
4h 21m
1 stop
ONT6:21 amOntario

Best airlines flying from Ontario to Seattle

Compare and see reviews for airlines that fly from Ontario to Seattle with momondo
AirlineRatingFree CancellationPrice
Juneyao AirlinesPriceFrom $14Free CancellationRating
0.0
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JetBluePriceFrom $71Free CancellationRating
6.9
7.1

Boarding

7.4

Comfort

7.7

Crew

7.0

Entertainment

6.5

Food

Reviews

The snacks could be better with the options.

1 / 10
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FrontierPriceFrom $90Free CancellationRating
6.2
6.4

Boarding

5.8

Comfort

7.0

Crew

4.7

Entertainment

5.0

Food

Reviews

Flight was delayed 2 hours and weren’t notified until we were at the gate. We found out later that the two flights before ours on our plane were delayed so they had plenty of time to tell us. Once we finally land we waited 45min for our checked bag- that cost $100 and it was 2:15 in the morning. Will never fly this airline again.

1 / 10
Search Frontier flights
Alaska AirlinesPriceFrom $92Free CancellationRating
8.0
8.2

Boarding

7.9

Comfort

8.5

Crew

7.2

Entertainment

7.2

Food

Reviews

The plane was on time; arrived Seattle half an hour early. Cabin crews were well mannered and cordial. However, snacks served during flight could have been better considering flight duration

1 / 10
Search Alaska Airlines flights
DeltaPriceFrom $99Free CancellationRating
7.8
7.9

Boarding

8.0

Comfort

8.3

Crew

7.7

Entertainment

7.3

Food

Reviews

One of the crew member weren’t to pleasant

1 / 10
Search Delta flights
United AirlinesPriceFrom $116Free CancellationRating
7.2
7.5

Boarding

7.1

Comfort

8.0

Crew

6.9

Entertainment

6.6

Food

Reviews

Couldn't make the flight because the Phoenix to Denver leg of our trip was cancelled by the airline.

1 / 10
Search United Airlines flights
American AirlinesPriceFrom $178Free CancellationRating
7.1
7.4

Boarding

7.1

Comfort

8.0

Crew

6.8

Entertainment

6.4

Food

Reviews

Overall, no major problems and all employees were great. The gate area was not large enough for the passengers, so people congregated in the walkway or sat in a different area, which is slightly burdensome because you can’t hear announcements elsewhere. But this is an airport not airline issue and nothing in the short term could address it.

1 / 10
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  • Alaska Airlines Flights From Ontario to Seattle

    Alaska Airlines flight deals from Ontario to Seattle start from $92 round-trip. Over the 5 Alaska Airlines flights for this route in a normal week, average airfare is usually $204 round-trip - but some users have found much cheaper deals with momondo.

  • Delta Flights From Ontario to Seattle

    $99 is the best Delta flight deal from Ontario to Seattle found on momondo over the last 72 hours. The average Delta ticket price found was closer to $247, however, with flight time and availability significantly affecting the price. Delta (7.8/10 from 392 user reviews) flies into Seattle from Ontario 21 times in an average week so prices can vary.


Delta flights from Ontario to Seattle

Our best Delta deals on Ontario to Seattle flight tickets
Delta
Oct 1
ONT6:06 amOntario
6h 32m
1 stop
SEA12:38 pmSeattle/Tacoma Intl
Oct 5
SEA4:15 amSeattle/Tacoma Intl
2h 45m
ONT7:00 amOntario
Delta
Jul 3
ONT1:45 pmOntario
2h 42m
SEA4:27 pmSeattle/Tacoma Intl
Jul 6
SEA4:48 amSeattle/Tacoma Intl
2h 46m
ONT7:34 amOntario
Delta
Jul 3
ONT9:30 amOntario
5h 17m
1 stop
SEA2:47 pmSeattle/Tacoma Intl
Jul 6
SEA4:48 amSeattle/Tacoma Intl
2h 46m
ONT7:34 amOntario

Alaska Airlines flights from Ontario to Seattle

Our best Alaska Airlines deals on Ontario to Seattle flight tickets
Alaska Airlines
Sep 14
ONT4:30 pmOntario
2h 45m
SEA7:15 pmSeattle/Tacoma Intl
Sep 18
SEA2:00 amSeattle/Tacoma Intl
2h 35m
ONT4:35 amOntario
Alaska Airlines
Nov 9
ONT7:05 amOntario
5h 36m
1 stop
SEA12:41 pmSeattle/Tacoma Intl
Nov 12
SEA2:00 amSeattle/Tacoma Intl
2h 35m
ONT4:35 amOntario
Alaska Airlines
Sep 16
ONT4:30 pmOntario
2h 45m
SEA7:15 pmSeattle/Tacoma Intl
Sep 18
SEA2:00 amSeattle/Tacoma Intl
2h 35m
ONT4:35 amOntario

  • Are airlines flying from Ontario to Seattle/Tacoma Intl offering flexible cancellation due to COVID-19?

    To ease the stress of booking flights, some of our airline partners flying from Ontario to Seattle/Tacoma Intl are responding to the global pandemic. The following airlines may have a flexible cancellation policy to help accommodate travelers: Alaska Airlines, Delta, and Juneyao Airlines.

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

    The straight-line distance from Ontario to Seattle/Tacoma Intl is 966.6 mi. By plane, this route typically takes 2h 35m.



Alternative routes for Ontario to Seattle

Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
Los Angeles to Seattle Flights
Fastest flight time2h 39m
Cheapest price$178
San Francisco to Seattle Flights
Fastest flight time1h 59m
Cheapest price$138
Santa Ana to Seattle Flights
Fastest flight time2h 37m
Cheapest price$198
San Jose to Seattle Flights
Fastest flight time2h 05m
Cheapest price$177
Burbank to Seattle Flights
Fastest flight time2h 38m
Cheapest price$196
San Diego to Seattle Flights
Fastest flight time2h 50m
Cheapest price$164
Oakland, California to Seattle Flights
Fastest flight time1h 58m
Cheapest price$158
Sacramento to Seattle Flights
Fastest flight time1h 55m
Cheapest price$167
Santa Rosa to Seattle Flights
Fastest flight time1h 50m
Cheapest price$238
Long Beach to Seattle Flights
Fastest flight time4h 46m
Cheapest price$198
Los Angeles to Spokane Flights
Fastest flight time2h 30m
Cheapest price$192
Fresno to Seattle Flights
Fastest flight time2h 16m
Cheapest price$242

Similar Ontario to Seattle flights

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Why use momondo?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to Seattle. momondo saves you time and could save you money on your trip.

Yes. momondo enables you to select and highlight flights to Seattle from Ontario with this policy.

momondo helps you find the best flight between Ontario and Seattle 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.

Price alerts on flights to Seattle from Ontario 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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