Cheap flights from Ontario to Seattle

Round-trip
Economy
Los Angeles (LAX)
Seattle (SEA)
Thu 6/17
Thu 6/24
Any month
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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$137The best flight deal from Ontario to Seattle found on momondo in the last 72 hours is $137
Fastest flight time2h 38mThe fastest flight from Ontario to Seattle takes 2h 38m
Direct flightsWe and FrDirect flights go from Ontario to Seattle on Wednesday and Friday. The only airline offering direct flights is Alaska Airlines.
Airports in Seattle3 airportsThere 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?

January
The cheapest time of year to fly to Seattle from Ontario is January. Most expensive is November

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?

at noon
Ontario to Seattle flights are approximately 21% more expensive in the morning than at noon

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

Frontier
Frontier, Major Airline, and United Airlines 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
ONT
Ontario
SEA
Seattle/Tacoma Intl

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

52 days before
The cheapest time to buy a flight from Ontario to Seattle is approximately 52 days to departure
60
Days before departure
0

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
Alaska Airlines
Aug 19
ONT8:15 amOntario
2h 35m
SEA10:50 amSeattle/Tacoma Intl
Aug 23
SEA4:50 amSeattle/Tacoma Intl
2h 29m
ONT7:19 amOntario
Alaska Airlines
Jun 11
ONT10:45 amOntario
2h 38m
SEA1:23 pmSeattle/Tacoma Intl
Jun 11
SEA3:30 pmSeattle/Tacoma Intl
2h 29m
ONT5:59 pmOntario
Alaska Airlines
Jun 1
ONT4:30 pmOntario
2h 38m
SEA7:08 pmSeattle/Tacoma Intl
Jun 5
SEA11:50 amSeattle/Tacoma Intl
2h 29m
ONT2:19 pmOntario

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
Alaska Airlines
Jul 8
ONT10:54 amOntario
2h 32m
SEA1:26 pmSeattle/Tacoma Intl
Alaska Airlines
Jun 11
ONT10:45 amOntario
2h 38m
SEA1:23 pmSeattle/Tacoma Intl
Alaska Airlines
Jun 1
ONT4:30 pmOntario
2h 38m
SEA7:08 pmSeattle/Tacoma Intl

Best airlines flying from Ontario to Seattle

Compare and see reviews for airlines that fly from Ontario to Seattle with momondo
AirlineRatingFree CancellationPrice
JetBlue
PriceFrom $71
Free Cancellation
Rating
8.2
8.6

Boarding

8.4

Comfort

8.7

Crew

8.2

Entertainment

7.9

Food

Reviews

Cons: Todo fue Exelente...

1 / 10
United Airlines
PriceFrom $77
Free Cancellation
Rating
6.8
7.2

Boarding

6.6

Comfort

7.5

Crew

6.6

Entertainment

6.0

Food

Reviews

Pros: everything

Cons: nono

1 / 10
Delta
PriceFrom $87
Free Cancellation
Rating
8.1
8.2

Boarding

8.4

Comfort

8.2

Crew

7.8

Entertainment

8.0

Food

Reviews

Cons: Wouldn't let us on the flight when there was plenty of time to get there. Manager was arrogant and slow - didn't care. Poor policies at that airport.

1 / 10
American Airlines
PriceFrom $94
Free Cancellation
Rating
7.2
7.4

Boarding

7.1

Comfort

7.9

Crew

7.0

Entertainment

6.8

Food

Reviews

Pros: Yes made sure mask was in place

Cons: No

1 / 10
Alaska Airlines
PriceFrom $98
Free Cancellation
Rating
8.2
8.7

Boarding

8.5

Comfort

8.8

Crew

8.0

Entertainment

7.4

Food

Reviews

Pros: Accommodated to an earlier flight without questions asked.

Cons: Always been a delight!

1 / 10
Frontier
PriceFrom $106
Free Cancellation
Rating
7.5
8.0

Boarding

7.1

Comfort

8.1

Crew

6.6

Entertainment

6.9

Food

Reviews

Cons: Everything is ok

1 / 10
Spirit Airlines
PriceFrom $149
Free Cancellation
Rating
7.0
7.4

Boarding

6.7

Comfort

7.7

Crew

6.2

Entertainment

6.4

Food

Reviews

Cons: Too many of the passengers were out of control

1 / 10

Which airlines flying from Ontario to Seattle/Tacoma Intl have COVID-19 safety policies in place?

Airlines such as Alaska Airlines have taken additional precautions to make sure you’re safer while traveling. When flying from Ontario to Seattle/Tacoma Intl, expect masks to be provided - they are required onboard. Aircrafts are also being cleaned thoroughly with enhanced products regularly. Additional policies include the installation of HEPA filters and pre-flight testing. Some airlines are even offering socially-distanced seating for a limited time. Keep in mind that policies will vary by airline.

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, United Airlines, and Delta.


Flights from Ontario to:

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  • Economy
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  • Business
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  • Multiple
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First