starting at $304
starting at $109
Flaut.Travel was designed and developed by a team dedicated to making the process of searching, comparing and booking airline tickets as easy and convenient as possible. Our service helps travelers to find and buy the cheapest flights from Ontario to Seattle. We have connected more than 40 airlines and airline ticketing agencies to help you find the most suitable and affordable flight option.
The cost of a one-way flight from Ontario to Seattle ranges from $69 (November 2026) to $154 (January 2027). On average, the ticket price is about $125–$143.
A non-stop flight is the most convenient and comfortable way to fly from Ontario to Seattle, despite the fact that sometimes flights with transfers can cost significantly less.
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Answers to questions about the route that travelers are most interested in.
We keep tight track on airlines' pre-holidays sales and other special offers occurences all the time to let you save maximum amount of funds while traveling to your family or just going out on vacation.
Ticket prices for Ontario — Seattle follow a predictable curve: rise, peak, and decline. This typical seasonal pattern lets you plan your purchase to avoid overpaying.
Prices rise from November 2026 to January 2027 (+123%), then decline from October 2026 to November 2026 (48%). The cheapest tickets are in October 2026–November 2026 (averaging $101), while the priciest are in December 2026–January 2027 ($149).
For savings, plan your flight for October 2026–November 2026 — you could save up to 32%. Try to avoid December 2026–January 2027 when possible: prices are at their highest then.
Price spread on this route is 26.4%. Costs depend heavily on the season, so flexibility in choosing your departure month is especially valuable here.
Flights from Ontario to Seattle are operated by several airlines — Alaska Airlines and Frontier Airlines. This allows passengers to flexibly choose flights based on departure time, cost, and additional services. The minimum ticket price starts at $109, making this destination accessible to travelers with different budgets. We help compare all available options in real time, so you can book tickets at the best value for money. The service ensures transparent search and lets you book affordable flights in just a few clicks.
starting at $304
starting at $109
Ontario — Seattle
11/14/2026
Departure
Direct flight
AS607
starting at $304
There are most likely no direct flights on the Ontario — Seattle route
The cheapest flight ticket from Ontario to Seattle according to data for the last 48 hours costs $109
Often the best time to buy tickets from Ontario to Seattle is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from Ontario to Seattle can be found flying in these months: November, October, December.
The fastest flights from Ontario to Seattle start from 8 hours 42 minutes in the air.
The following airlines operate direct flights on the route Ontario — Seattle: Alaska Airlines
All airports
The cheapest one-way flight from Ontario to Seattle departs on 11/14/2026, is operated by Frontier Airlines and costs $109
The cheapest roundtrip flight from Ontario to Seattle departs on 11/25/2026, is operated by Frontier Airlines and costs $161
Fastest flight from Ontario to Seattle takes 8h 42m
There are direct flights on this route 1 day a week: Sa
The distance between Ontario and Seattle is 1557km (965 miles). There are 50 direct flights from Ontario to Seattle. Ontario and Seattle are in the same time zone. Flights from Ontario begin at 6:00 AM. The latest flight from Ontario departs at 7:59 PM
We couldn't find any special offers for flights from Ontario to Seattle