Cheap Flights from Ontario to Seattle Starting at $39

Helping travelers to find the best flight offers

Cheapest flights from Ontario to Seattle

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.

Cheapest one way flight

$39

Spirit Airlines
Spirit Airlines
Direct flight
2h 58m
04/02/2025

The cheapest one-way flight from Ontario to Seattle departs on 04/02/2025, is operated by Spirit Airlines and costs $39

Cheapest round trip flight

$104

Frontier Airlines
Frontier Airlines
Direct flight
5h 47m
05/31/2025

The cheapest roundtrip flight from Ontario to Seattle departs on 05/31/2025, is operated by Frontier Airlines and costs $104

The fastest flight

2h 49m

Fastest flight from Ontario to Seattle takes 2h 49m

Direct flights

Every day

There are direct flights on this route 7 days a week: Su, Mo, Tu, We, Th, Fr, and Sa

Earliest flight

6:00 AM

Latest flight

7:07 PM

Direct flights count

70

Distance

1557km

Timezone difference

0h

The distance between Ontario and Seattle is 1557km (965 miles). There are 70 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 7:07 PM.

Airfare from Ontario to Seattle by month

We carefully collect statistics on the search and pricing of airlines and, based on these data, we make an assumption about future prices. Thus, you can better understand which season is the cheapest to fly from Ontario to Seattle

March 2025
Lowest price
on average:
$57
September 2025
Highest price
on average:
$139

Airlines operating on route

Below you will find a list of airlines operating flights on the Ontario — Seattle route and the starting prices for flights of each specific airline on it.

Starting at $39

Starting at $87

Starting at $88

Starting at $147

Starting at $152

Direct Flights from Ontario to Seattle

A direct 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.

Schedule of direct flights from Ontario to Seattle

A direct flight is the easiest way to get to your destination. The following airlines operate non-stop flights from Ontario to Seattle:

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Unable to find information about the schedule of direct flights from

Ontario airports overview

ONT
Frontier Airlines
Alaska Airlines
Airlines flying to this airport
$47
Starting at
$103-2%
on average
LAX
Spirit Airlines
Frontier Airlines
Airlines flying to this airport
$19
Starting at
$106
on average

Seattle airports overview

SEA
Alaska Airlines
Spirit Airlines
Frontier Airlines
Airlines flying to this airport
$19
Starting at
$105
on average

Frequently asked questions (FAQ)

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

Special offers and sales on air tickets from Ontario to Seattle

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.

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

Alternative routes