£73 Cheap Flights from Ontario (ONT) to Seattle (SEA)

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Ontario to Seattle. Operating between them 18 flights per day, 20 airlines cover the route. And Qatar Airways, KLM, JAL, Alaska Airlines, Delta Air Lines, Hawaiian Airlines, Korean Air, WestJet, Virgin Atlantic fly direct, getting you to Seattle - Tacoma Intl. in just 2hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Los Angeles - Ontario Intl. to Seattle - Tacoma Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Los Angeles - Ontario Intl. (ONT) to Seattle - Tacoma Intl. (SEA)

The easiest way to view the best deals on flights from Ontario to Seattle today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Los Angeles - Ontario Intl. to Seattle - Tacoma Intl. start at just £130 and range up to £152.  

To find an even better deal, try  

• being flexible on your dates – midweek flights can be cheaper
• looking for other airports near Ontario and Seattle
• booking your flight during November, the cheapest month on this route
• varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Ontario to Seattle flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Los Angeles - Ontario Intl. to Seattle - Tacoma Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.