Snowy day at Ontario Beach with pier and welcoming sign, enforcing park rules. — flights from Seattle to Ontario
SeattleOntario

Flights from Seattle to Ontario

Nonstop flights from Seattle (SEA) to Ontario (ONT) take about 2h 26m (1,540 km). Frontier Airlines flies it. Lowest fare seen: $32 one-way, nonstop (12 Oct 2026).

All flights from Seattle →

Book from $32 one-way

Photo of Ontario: Marri Shyam on Pexels.

When you land in Ontario

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

Getting out of Ontario (ONT)

Skip the taxi rank and lock in your fare before you land.

Pre-book a fixed-price transfer

Our pick

Driver waits at arrivals with your name, tracks your flight, and the price you see is the price you pay. English-speaking, fixed price. No surge, no haggling at 2am.

Check transfer pricesRenting a car instead? Compare rentals with free cancellation.
Alaska Airlines plane soaring through a bright sky with fluffy clouds in Seattle. — lounges at Seattle AirportSeattle Airport · 2 lounges
Before you flyAirport lounges at Seattle →

Things to book in Ontario

from €111.58
iFLY Indoor Skydiving - Ontario 5.0 · 2 Tiqets reviews

Find hotels in Ontario

Hotels, hostels & more · Expedia

Search hotels

Airlines flying Seattle to Ontario

Carriers on SEA–ONT 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 — Seattle to Ontario flights

How long is the flight from Seattle to Ontario?
A nonstop flight from Seattle (SEA) to Ontario (ONT) 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 Seattle from Ontario by air?
The great-circle distance between Seattle–Tacoma International Airport and Ontario International Airport is 1,540 km (957 miles), a medium-haul route.
Which airlines fly from Seattle to Ontario?
Airlines with flights or nonstop fares on the SEA–ONT 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 Seattle to Ontario cost?
The lowest one-way fare seen recently on SEA–ONT was $32 USD with Frontier Airlines (nonstop), departing 9 Nov 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 Seattle to Ontario?
It depends on your passport. Some nationalities can enter Ontario 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.

Ready to book SEA–ONT?

Set a fare alert, check your visa, or search flights now.

🔔 Fare alert for SEA–ONT🌍 Check visa requirements ⚡ Connection risk checker