Flights » From Ontario, CA (ONT-Ontario Intl.) » To Seattle, WA (SEA-Seattle Tacoma)

Learn about flights from ONT to SEA

Click here to find $120 flights

On this page, you'll find a collection of useful information on flights from Ontario, CA (ONT-Ontario Intl.) to Seattle, WA (SEA-Seattle Tacoma). When you're ready to search, click here for the cheapest flights!

Cleverlayover is a flight search engine for cheaper flights. We find savings by looking at all the possible ways to get from your origin to your destination, including searches that look at each possible layover location individually. For example, if you're flying from ONT to SEA, we'll search for flights from ONT to every other airport and then flights from those airports to SEA. After piecing together those flights, we can find savings that the other search engines don't show you.

Historical prices

The average price for Ontario, CA (ONT-Ontario Intl.) to Seattle, WA (SEA-Seattle Tacoma) is $269. Historically, the price typically stays between $144 and $769.

Average price Standard deviation Low season High season
$269 $100 $144 $769

When to book

The best day of the week to book your flight is on


When to fly

Based on estimated prices found within the last 4 days, the best departure date is Saturday, Oct 24:


Hotels at your destination

You can book hotels for Seattle, WA (SEA-Seattle Tacoma) at any of the following sites:

Popular layovers

When you fly from Ontario, CA (ONT-Ontario Intl.) to Seattle, WA (SEA-Seattle Tacoma), you might want to take a layover somewhere. This can save you money, and it can allow you to visit another location. How do you find the right layover locations, though? Which ones will be cheapest? Which ones will be fun? Here are some popular layovers for savvy travelers going from ONT to SEA:

Take a layover in Origin to Layover Layover to Destination
San Francisco, CA (SFO-San Francisco Intl.)
Portland, OR (PDX-Portland Intl.)
Phoenix, AZ (PHX-Sky Harbor Intl.)
Denver, CO (DEN-Denver Intl.)
Salt Lake City, UT (SLC-Salt Lake City Intl.)
Copyright © 2015 - 2020 cleverlayover

Flight availability powered by