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Flights from Seattle to Ontario (SEA to ONT)

Discover alternate routes & cheap one way flights from Seattle to Ontario (SEA to ONT) within a departure date range.

⭐ Search by country or region to discover cheaper routes you didn't know existed. Example: Netherlands → Italy or Europe → South-East Asia.

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  • USD 158
    Alaska Airlines
    9:25pm - 11:59pm
    Mon Apr 8th
    2h 34m
    Seattle (SEA) → Ontario (ONT)
    Direct

    Mon Apr 8th 2024 Alaska Airlines · AS 1040 Depart at 9:25pm from Seattle (SEA) Fly for 2h 34m Arrive at 11:59pm in Ontario (ONT)

  • USD 190
    Alaska Airlines
    4:31pm - 7:04pm
    Mon Apr 8th
    2h 33m
    Seattle (SEA) → Ontario (ONT)
    Direct

    Mon Apr 8th 2024 Alaska Airlines · AS 1086 Depart at 4:31pm from Seattle (SEA) Fly for 2h 33m Arrive at 7:04pm in Ontario (ONT)

  • USD 190
    Alaska Airlines
    6:47am - 9:25am
    Mon Apr 8th
    2h 38m
    Seattle (SEA) → Ontario (ONT)
    Direct

    Mon Apr 8th 2024 Alaska Airlines · AS 1254 Depart at 6:47am from Seattle (SEA) Fly for 2h 38m Arrive at 9:25am in Ontario (ONT)

  • USD 224
    Alaska Airlines
    6:45am - 11:18am
    Mon Apr 8th
    4h 33m
    Seattle (SEA) → Ontario (ONT)
    1 Stop

    Mon Apr 8th 2024 Alaska Airlines · AS 3306 Depart at 6:45am from Seattle (SEA) Fly for 0h 54m Arrive at 7:39am in Portland (PDX)

    Layover in Portland for 1h 21m

    Mon Apr 8th 2024 Alaska Airlines · AS 3382 Depart at 9:00am from Portland (PDX) Fly for 2h 18m Arrive at 11:18am in Ontario (ONT)

  • USD 249
    Alaska Airlines
    1:59pm - 4:37pm
    Mon Apr 8th
    2h 38m
    Seattle (SEA) → Ontario (ONT)
    Direct

    Mon Apr 8th 2024 Alaska Airlines · AS 1118 Depart at 1:59pm from Seattle (SEA) Fly for 2h 38m Arrive at 4:37pm in Ontario (ONT)

  • USD 250
    Alaska Airlines
    9:25pm - 11:59pm
    Sun Apr 7th
    2h 34m
    Seattle (SEA) → Ontario (ONT)
    Direct

    Sun Apr 7th 2024 Alaska Airlines · AS 1040 Depart at 9:25pm from Seattle (SEA) Fly for 2h 34m Arrive at 11:59pm in Ontario (ONT)

  • USD 298
    Alaska Airlines
    5:21pm - 7:54pm
    Sun Apr 7th
    2h 33m
    Seattle (SEA) → Ontario (ONT)
    Direct

    Sun Apr 7th 2024 Alaska Airlines · AS 119 Depart at 5:21pm from Seattle (SEA) Fly for 2h 33m Arrive at 7:54pm in Ontario (ONT)

  • USD 298
    Alaska Airlines
    1:59pm - 4:37pm
    Sun Apr 7th
    2h 38m
    Seattle (SEA) → Ontario (ONT)
    Direct

    Sun Apr 7th 2024 Alaska Airlines · AS 1118 Depart at 1:59pm from Seattle (SEA) Fly for 2h 38m Arrive at 4:37pm in Ontario (ONT)

  • USD 331
    Alaska Airlines
    5:15pm - 9:52pm
    Mon Apr 8th
    4h 37m
    Seattle (SEA) → Ontario (ONT)
    1 Stop

    Mon Apr 8th 2024 Alaska Airlines · AS 2097 Depart at 5:15pm from Seattle (SEA) Fly for 0h 51m Arrive at 6:06pm in Portland (PDX)

    Layover in Portland for 1h 29m

    Mon Apr 8th 2024 Alaska Airlines · AS 3318 Depart at 7:35pm from Portland (PDX) Fly for 2h 17m Arrive at 9:52pm in Ontario (ONT)

  • USD 385
    Alaska Airlines
    1:30pm - 5:42pm
    Mon Apr 8th
    4h 12m
    Seattle (SEA) → Ontario (ONT)
    1 Stop

    Mon Apr 8th 2024 Alaska Airlines · AS 2354 Depart at 1:30pm from Seattle (SEA) Fly for 0h 54m Arrive at 2:24pm in Portland (PDX)

    Layover in Portland for 1h 1m

    Mon Apr 8th 2024 Alaska Airlines · AS 3394 Depart at 3:25pm from Portland (PDX) Fly for 2h 17m Arrive at 5:42pm in Ontario (ONT)

  • USD 501
    Alaska Airlines
    6:47am - 9:25am
    Sun Apr 7th
    2h 38m
    Seattle (SEA) → Ontario (ONT)
    Direct

    Sun Apr 7th 2024 Alaska Airlines · AS 1254 Depart at 6:47am from Seattle (SEA) Fly for 2h 38m Arrive at 9:25am in Ontario (ONT)

  • USD 513
    Alaska Airlines
    5:15pm - 10:07pm
    Sun Apr 7th
    4h 52m
    Seattle (SEA) → Ontario (ONT)
    1 Stop

    Sun Apr 7th 2024 Alaska Airlines · AS 2097 Depart at 5:15pm from Seattle (SEA) Fly for 0h 51m Arrive at 6:06pm in Portland (PDX)

    Layover in Portland for 1h 44m

    Sun Apr 7th 2024 Alaska Airlines · AS 3318 Depart at 7:50pm from Portland (PDX) Fly for 2h 17m Arrive at 10:07pm in Ontario (ONT)

  • USD 544
    Alaska Airlines
    1:55pm - 5:52pm
    Sun Apr 7th
    3h 57m
    Seattle (SEA) → Ontario (ONT)
    1 Stop

    Sun Apr 7th 2024 Alaska Airlines · AS 2354 Depart at 1:55pm from Seattle (SEA) Fly for 0h 54m Arrive at 2:49pm in Portland (PDX)

    Layover in Portland for 0h 46m

    Sun Apr 7th 2024 Alaska Airlines · AS 3394 Depart at 3:35pm from Portland (PDX) Fly for 2h 17m Arrive at 5:52pm in Ontario (ONT)

  • USD 608
    Alaska Airlines
    7:45am - 11:43am
    Sun Apr 7th
    3h 58m
    Seattle (SEA) → Ontario (ONT)
    1 Stop

    Sun Apr 7th 2024 Alaska Airlines · AS 2073 Depart at 7:45am from Seattle (SEA) Fly for 0h 56m Arrive at 8:41am in Portland (PDX)

    Layover in Portland for 0h 44m

    Sun Apr 7th 2024 Alaska Airlines · AS 3382 Depart at 9:25am from Portland (PDX) Fly for 2h 18m Arrive at 11:43am in Ontario (ONT)

  • USD 715
    Alaska Airlines
    6:45am - 11:43am
    Sun Apr 7th
    4h 58m
    Seattle (SEA) → Ontario (ONT)
    1 Stop

    Sun Apr 7th 2024 Alaska Airlines · AS 3306 Depart at 6:45am from Seattle (SEA) Fly for 0h 54m Arrive at 7:39am in Portland (PDX)

    Layover in Portland for 1h 46m

    Sun Apr 7th 2024 Alaska Airlines · AS 3382 Depart at 9:25am from Portland (PDX) Fly for 2h 18m Arrive at 11:43am in Ontario (ONT)

@sarahbb1
Sarah Belizaire
@sarahbb1

Have flexible travel plans or looking for alternative routes given the chaos? Check out all the connection possibilities via a super helpful site created by @ismaelyws flightlist.io thanks to @andy_travels for the recommendation #travel #flights

@eyupitsjohn
John Ford
@eyupitsjohn

There seem to be lots of sites launching at the moment that promise to find you cheap flights but not many have the professional finish of Flightlist by @ismaelyws #travel #flights

@andy_travels
Andy Travels
@andy_travels

@ismaelyws Just tried out Flightlist for the first time. Really nice idea, well made, and just what I need at the moment 👍

@travelwitbender
Travel With Bender
@travelwitbender

Did you spot my recent article about how to score cheap one way flights? ✈️ FlightList is my new secret tool for discovering cheap routes, within a departure date range. Plus you can also search by country/region for departures & destinations. Powerful! 💪

Explore Flight Options

Cheap Flight Search Tips

Tips to help you find the cheapest flights from Seattle to Ontario (SEA to ONT).

  • Book 45-90 days before your departure date.
  • Fly during weekdays (Monday-Thursday).
  • Airfare Sales: Airlines sometimes offer huge discounts and since we take a bottom-up approach these flights will appear first in the results, so check back regularly because they don't usually last long.

Why I Built FlightList

❝As someone who works remotely & travels frequently, I always book one way flights and I'm flexible on my departure dates. I look for the best deals. Most sites require you to enter a specific departure date and clutter the page with uneccessary options, images and ads. I want something simple and minimal which allows me to search by departure date range & display a list of flights with the ability to filter according to my needs. So, I built FlightList to solve my own problem & help other travelers who may have the same frustration. It's how I imagine a flight booking site should be.❞

- Hans Desjarlais, Founder & Creator Hans Desjarlais