A stunning twilight view of Seattle's skyline with illuminated skyscrapers and busy traffic below. — flights from Ontario to Seattle
OntarioSeattle

Flights from Ontario to Seattle

Nonstop flights from Ontario (ONT) to Seattle (SEA) take about 2h 26m (1,540 km). Frontier Airlines flies it. Lowest fare seen: $193 one-way, nonstop (12 Oct 2026).

All flights from Ontario →All flights to Seattle →

Book from $193 one-way

Photo of Seattle: Stephen Leonardi on Pexels.

When you land in Seattle

The airport transfer and the few things worth sorting before you fly.

Alaska Airlines plane soaring through a bright sky with fluffy clouds in Seattle. — arriving in Seattle

Airport transfer

SEA → Seattle, booked before you fly

A private driver meets you in arrivals at a price agreed when you book. Book with Welcome Pickups.

See transfer prices
Silhouette of an airplane landing with a stunning sunset sky in Ontario, California. — lounges at Ontario AirportOntario Airport · 2 lounges
Before you flyAirport lounges at Ontario →
Trains, buses and taxi faresSEA to Seattle: getting into town →Early arrival or late flightLuggage storage in Seattle →10 drop-off points, from $4.90

Things to book in Seattle

All 22 things to do in Seattle →
from €3.57
Seattle Center Monorail 4.5 · 1,891 Tiqets reviews
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Woodland Park Zoofrom €20.49
Woodland Park Zoo 4.6 · 143 Tiqets reviews
from €43.10
Seattle Sightseeing Cruises 4.6 · 61 Tiqets reviews

Find hotels in Seattle

Hotels, hostels & more · Expedia

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Airlines flying Ontario to Seattle

Carriers on ONT–SEA according to our route data and nonstop fares seen as of 12 Oct 2026. Not a complete list.

✈ Frontier Airlinesnonstop fare seen

More for this trip

Frequently asked questions — Ontario to Seattle flights

How long is the flight from Ontario to Seattle?
A nonstop flight from Ontario (ONT) to Seattle (SEA) takes about 2h 26m, covering 1,540 km. That is an estimate from the distance — actual time varies with the airline, aircraft and winds, and connecting itineraries take longer.
How far is Ontario from Seattle by air?
The great-circle distance between Ontario International Airport and Seattle–Tacoma International Airport is 1,540 km (957 miles), a medium-haul route.
Which airlines fly from Ontario to Seattle?
Airlines with flights or nonstop fares on the ONT–SEA route include Frontier Airlines. This is not a complete list — schedules change by season, so check the current options before booking.
How much does a flight from Ontario to Seattle cost?
The lowest one-way fare seen recently on ONT–SEA was $193 USD with Frontier Airlines (nonstop), departing 15 Oct 2026, found in fare searches as of 12 Oct 2026. Fares change constantly and depend on the date, so check the current price before booking.
Do I need a visa to travel from Ontario to Seattle?
It depends on your passport. Some nationalities can enter Seattle visa-free or get a visa on arrival; others must apply in advance. Use AirConnect's Visa Checker to see the rules for your passport.

Sources: fares from Travelpayouts flight-search data, seen 12 Oct 2026; airlines from each carrier's published network and nonstop fares on sale; distance from OurAirports coordinates; flight time estimated from distance. Fares change daily.

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