Cheap Flights from Seattle to Ontario

Cheapest flights from Seattle to Ontario

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.

Cheapest one way flight

$48

Frontier Airlines

Direct flight

2h 48m

11/09/2026

The cheapest one-way flight from Seattle to Ontario departs on 11/09/2026, is operated by Frontier Airlines and costs $48

Cheapest round trip flight

$158

Frontier Airlines

Direct flight

5h 50m

10/30/2026

The cheapest roundtrip flight from Seattle to Ontario departs on 10/30/2026, is operated by Frontier Airlines and costs $158

The fastest flight

2h 48m

Fastest flight from Seattle to Ontario takes 2h 48m

Direct flights

Several times a week

There are direct flights on this route 2 days a week: Mo and Sa

Earliest flight

8:20 AM

Latest flight

8:43 PM

Direct flights count

52

Distance

1557km

Timezone difference

0h

The distance between Seattle and Ontario is 1557km (965 miles). There are 52 direct flights from Seattle to Ontario. Seattle and Ontario are in the same time zone. Flights from Seattle begin at 8:20 AM. The latest flight from Seattle departs at 8:43 PM

Remember that on average the ideal time to book flights is 2 months before departure!

Airfare from Seattle to Ontario by month

The minimum one-way ticket price from Seattle to Ontario is $106 (October 2026), while the maximum is $131 (November 2026). On average, a ticket costs $119–$252.

October 2026

Lowest price

on average:

$106

November 2026

Highest price

on average:

$131

Avg Price

Price dynamics

On the Seattle — Ontario route, ticket prices are stable. Whichever month you choose, the difference will be minimal.

Cheaper and more expensive periods

There is a slight difference: it's a bit cheaper in October 2026–November 2026 (averaging $118) and slightly more in November 2026–December 2026 ($126). But overall, the difference is small.

Best time to buy

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 6%. Book whenever it's convenient.

Price predictability

Monthly price variation is just 8.8%. Ticket costs on this route are among the most predictable.

Airlines operating on route

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 $48 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.

Alaska Airlines

starting at $346

Frontier Airlines

starting at $48

Non-stop flights from Seattle to Ontario

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.

Seattle — Ontario

SEA — ONT

10/24/2026

Departure

Direct flight

AS489

starting at $375

Seattle — Ontario

SEA — ONT

10/24/2026

Departure

Direct flight

AS476

starting at $346

Seattle — Ontario

SEA — ONT

11/09/2026

Departure

Direct flight

F92276

starting at $130

Schedule of direct flights from Seattle to Ontario

There are most likely no direct flights on the Seattle — Ontario route

Seattle airports overview

Boeing Field International Airport

•

BFI

8km

Seattle-Tacoma International Airport

•

SEA

19km

Primary air hub for the Seattle metropolitan area and Puget Sound, offering extensive domestic and international routes, multiple terminals, light rail and shuttle connections, and convenient access to downtown Seattle.

•

Ontario airports overview

Ontario International Airport

•

ONT

5km

Serves Ontario and the Inland Empire region of Southern California, offering domestic and select international flights; convenient for travelers to Los Angeles, San Bernardino and nearby business centers.

•

Frequently asked questions (FAQ)

Answers to questions about the route that travelers are most interested in.

What is the cheapest price for flights from Seattle to Ontario?

The cheapest flight ticket from Seattle to Ontario according to data for the last 48 hours costs $48

When is the best time to buy air tickets on the route Seattle — Ontario?

Often the best time to buy tickets from Seattle to Ontario is 2 months before departure.

When is the cheapest time of year to fly from Seattle to Ontario?

Based on statistics over the past years, the lowest prices for flights from Seattle to Ontario can be found flying in these months: October, December, November.

How long does it take to fly from Seattle to Ontario?

The fastest flights from Seattle to Ontario start from 2 hours 48 minutes in the air.

Which airline can fly direct from Seattle to Ontario?

The following airlines operate direct flights on the route Seattle — Ontario: Alaska Airlines, Frontier Airlines

Special offers and sales on air tickets from Seattle to Ontario

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.

We couldn't find any special offers for flights from Seattle to Ontario

Alternative routes

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Cheapest one way flight

$48

Frontier Airlines

Direct flight

2h 48m

11/09/2026

The cheapest one-way flight from Seattle to Ontario departs on 11/09/2026, is operated by Frontier Airlines and costs $48

Cheapest round trip flight

$158

Frontier Airlines

Direct flight

5h 50m

10/30/2026

The cheapest roundtrip flight from Seattle to Ontario departs on 10/30/2026, is operated by Frontier Airlines and costs $158

The fastest flight