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).

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When you land in Ontario

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Getting out of Ontario (ONT)

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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

Seattle to Ontario fares by month

Cheapest month seen for a nonstop flight: Nov 2026, from $82 one-way. Lowest one-way fares seen for departures in each month, read 22 Oct 2026.

DepartingNonstop fromCheaper with stops
Oct 2026$21430 Oct 2026 · Frontier Airlines$124 · 1 stop31 Oct 2026 · Frontier Airlines
Nov 2026$8224 Nov 2026 · Frontier Airlines—
Dec 2026$1777 Dec 2026 · Alaska Airlines$133 · 1 stop7 Dec 2026 · Frontier Airlines

When to go for the lowest fare

The next few weeks were the cheapest to fly: from $82 in November 2026, against $133 at best later on.

Nonstop or with a stop

A connection undercut nonstop in 2 of 2 months with both fares.

From Travelpayouts flight-search data, city to city (Seattle to Ontario, any airport), USD, read 22 Oct 2026. These are fares that were on sale, not a guarantee of today's price; an airline is named only where we know it flies this route.

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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.
What is the cheapest month to fly from Seattle to Ontario?
In fares seen on 22 Oct 2026, departures in November 2026 were cheapest, from $82 one-way, against $133 for December 2026, the dearest month. Fares change daily, so check your own dates.
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.

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