There are most likely no direct flights on the Seattle — Ontario route
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A non-stop flight is the most convenient and comfortable way to fly from Seattle to Ontario, 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.
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There are most likely no direct flights on the Seattle — Ontario route
The minimum one-way ticket price from Seattle to Ontario is $69 (August 2026), while the maximum is $124 (July 2026). On average, a ticket costs $89–$200.
Ticket prices for Seattle — Ontario are higher at the start and end of the period but lowest in the middle. This creates a convenient window for booking at a reduced price.
Prices fall from July 2026 to August 2026 (45%), then rise from August 2026 to September 2026 (+10%). The best period is August 2026–September 2026 ($72), the most expensive is July 2026–August 2026 ($96).
The best time to buy is August 2026–September 2026, when prices are at their lowest. This can save you up to 25% compared to the expensive months (July 2026–August 2026).
Monthly price variation is 27.6%. On this route, your departure date noticeably affects the cost, and choosing wisely can lead to real savings.
Seattle — Ontario
07/23/2026
Departure
Direct flight
AS489
starting at $229
Seattle — Ontario
08/01/2026
Departure
Direct flight
AS592
starting at $259
Seattle — Ontario
08/01/2026
Departure
Direct flight
F92276
starting at $313
Seattle — Ontario
08/19/2026
Departure
Direct flight
AS1364
starting at $148
Seattle — Ontario
09/04/2026
Departure
Direct flight
AS571
starting at $214
starting at $148
starting at $73
The route Seattle — Ontario is served by several airlines: Alaska Airlines and Frontier Airlines. This gives passengers more freedom in choosing flights. You can consider not only the price but also schedules, baggage policies, and onboard service. Our service compares all offers so you can find tickets from $73 and choose the most convenient option. Thanks to airline competition, you may also find promotional fares or special offers, helping you save even more. Plan your trip in advance and choose the best flights without overpaying.
The cheapest flight ticket from Seattle to Ontario according to data for the last 48 hours costs $73
Often the best time to buy tickets from Seattle to Ontario is 2 months before departure.
Based on statistics over the past years, the lowest prices for flights from Seattle to Ontario can be found flying in these months: August, September, July.
The fastest flights from Seattle to Ontario start from 2 hours 41 minutes in the air.
The following airlines operate direct flights on the route Seattle — Ontario: Alaska Airlines, Frontier Airlines
The cheapest one-way flight from Seattle to Ontario departs on 08/19/2026, is operated by Frontier Airlines and costs $73
There is no information about the cheapest roundtrip flight from Seattle to Ontario
Fastest flight from Seattle to Ontario takes 2h 41m
There are direct flights on this route 4 days a week: We, Th, Fr, and Sa
The distance between Seattle and Ontario is 1557km (965 miles). There are 5 direct flights from Seattle to Ontario. Seattle and Ontario are in the same time zone. Flights from Seattle begin at 8:33 AM. The latest flight from Seattle departs at 8:33 PM
We couldn't find any special offers for flights from Seattle to Ontario