There are most likely no direct flights on the Seattle — Ontario route
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 Seattle to Ontario. We have connected more than 40 airlines and airline ticketing agencies to help you find the most suitable and affordable flight option.
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
We couldn't find any special offers for flights from Seattle to Ontario
Seattle — Ontario
06/10/2026
Departure
Direct flight
F92276
starting at $178
Seattle — Ontario
06/30/2026
Departure
Direct flight
AS489
starting at $249
starting at $94
starting at $249
The route Seattle — Ontario is served by several airlines: Frontier Airlines and Alaska 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 $94 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 one-way flight from Seattle to Ontario departs on 06/30/2026, is operated by Frontier Airlines and costs $94
There is no information about the cheapest roundtrip flight from Seattle to Ontario
Fastest flight from Seattle to Ontario takes 2h 46m
There are direct flights on this route 2 days a week: Tu and We
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
The cheapest flight ticket from Seattle to Ontario according to data for the last 48 hours costs $94
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: July, September, June.
The fastest flights from Seattle to Ontario start from 2 hours 46 minutes in the air.
The following airlines operate direct flights on the route Seattle — Ontario: Frontier Airlines, Alaska Airlines
The minimum one-way ticket price from Seattle to Ontario is $104 (July 2026), while the maximum is $135 (October 2026). On average, a ticket costs $119–$119.
On the Seattle — Ontario route, ticket prices are stable. Whichever month you choose, the difference will be minimal.
There is a slight difference: it's a bit cheaper in July 2026–September 2026 (averaging $111) and slightly more in September 2026–October 2026 ($126). But overall, the difference is small.
On this route, you don't need to target specific months — prices are stable. The difference between the cheapest and most expensive period is only 12%. Book whenever it's convenient.
Monthly price variation is just 9.3%. Ticket costs on this route are among the most predictable.