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.
The minimum one-way ticket price from Seattle to Ontario is $63 (September 2026), while the maximum is $99 (November 2026). On average, a ticket costs $82–$183.
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.
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.
Tickets from Seattle to Ontario are getting more expensive each month. From September 2026 to November 2026, the increase reached 59%, with prices now at $99. It's unlikely to get cheaper than the current level.
The most significant price increase was from September 2026 to November 2026 — up 59%. The best time to fly is September 2026–October 2026, when the average price is $73. In October 2026–November 2026, tickets cost around $91.
Given the rising prices, it's best not to delay your purchase. Flying in September 2026–October 2026 can save you up to 20% compared to the most expensive months.
Price variation across months on this route is 18.5%. Your choice of departure month significantly affects the total flight cost.
There are most likely no direct flights on the Seattle — Ontario route
Seattle — Ontario
09/05/2026
Departure
Direct flight
UA2478
starting at $349
Seattle — Ontario
09/15/2026
Departure
Direct flight
AS571
starting at $261
Seattle — Ontario
09/06/2026
Departure
Direct flight
UA2478
starting at $532
Seattle — Ontario
09/09/2026
Departure
Direct flight
F92276
starting at $139
Seattle — Ontario
09/11/2026
Departure
Direct flight
WN2208
starting at $215
Seattle — Ontario
09/12/2026
Departure
Direct flight
WN2208
starting at $327
Seattle — Ontario
09/12/2026
Departure
Direct flight
WN106
starting at $289
starting at $349
starting at $261
starting at $63
starting at $215
The Seattle — Ontario route is served by a wide range of airlines: 4 in total, including United Airlines, Alaska Airlines, Frontier Airlines, and Southwest Airlines. Competition among carriers gives passengers the opportunity to find tickets at attractive fares — with prices starting from $63. Our service helps compare all available offers within seconds and choose the most convenient option. You can filter flights by price, departure time, or baggage rules to make your trip as comfortable as possible. With so many airlines, there’s always a chance to catch special promotions and save.
The cheapest flight ticket from Seattle to Ontario according to data for the last 48 hours costs $63
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: September, October, November.
The fastest flights from Seattle to Ontario start from 2 hours 51 minutes in the air.
The following airlines operate direct flights on the route Seattle — Ontario: United Airlines, Alaska Airlines, Frontier Airlines
The cheapest one-way flight from Seattle to Ontario departs on 09/09/2026, is operated by Frontier Airlines and costs $63
There is no information about the cheapest roundtrip flight from Seattle to Ontario
Fastest flight from Seattle to Ontario takes 2h 51m
There are direct flights on this route 5 days a week: Su, Tu, We, 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
