Beginning of main content
Trip Type
Flight 1
Flight 2
Flight 3
Flight 4
Flight 5

Search over 321,000 hotels worldwide and 400 airlines worldwide.

Secure incredible value with Expedia's Price Guarantee.

No Expedia cancellation fee to change or cancel almost any hotel reservation.

Cheap ONT to SEA Flights

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Orange County

$149.50

Long Beach

$136.40

Los Angeles

$136.40

Burbank

$142.49

Cheap ONT to SEA Flights

Question : Will you do what it takes to get the absolute lowest-cost flight?
Answer : The best day to fly on a budget this month is Monday. Being flexible with your travel days garners even more savings during booking.

Question : Is the price you found a good deal?
Answer : Flight prices change more than most routes in the United States for ONT to SEA. They vary from $136 to $808. However, the sooner you book, the better price you tend to get.

Question : Which airline is offering the cheapest flight from ONT to SEA?
Answer : Alaska Airlines is your best bet for finding that coveted low fare. They're offering fares as low as $136, while prices for other flights are as high as $808.

Question : Which airline is least likely to get you to SEA on time?
Answer : Alaska Airlines is delayed on 22% of flights from Ontario International Airport (ONT) to Seattle-Tacoma International Airport (SEA) at the moment. If you’re on Alaska Airlines, be sure to sign up for the delay notifications to stay up to date with your flight’s status.

Question : Have you considered flying out of an airport besides Ontario International Airport (ONT)?
Answer : Ontario International Airport is a wonderful airport, but in getting you to Seattle, there is a lower cost option – John Wayne Airport. It's just 30 miles away and flights are being priced 12% cheaper over the next two months.

Question : In terms of overall promptness, how does ONT to SEA rank compared to the rest of the world?
Answer : ONT to SEA currently scores 4 out of a possible 5 stars in promptness. This score combines both the number of delayed flights and total delay minutes. With 4 stars, you should feel confident in getting to Seattle on time.

Question : Best case scenario, how quickly can someone get from ONT to SEA?
Answer : The quickest direct flight is two hours and 36 minutes via Alaska Airlines. If you catch the 11:00 AM PST departure, you'll arrive at 1:36 PM PST.

Los Angeles to Seattle Flights

Sometimes you just need to get out of town or maybe you’re looking for a change of scenery. Regardless of the reason, a flight from Los Angeles to Seattle will do just the trick! Go on, plan to see all the famous landmarks and eat your weight in the local cuisine. Your trip is beckoning, so answer the call by packing your suitcase and filling your travel itinerary with exploring Seattle.

Whether you’re flying for business or jet-setting on your personal time, you’ve come to the right place. Here at Expedia.com, we’ll pair you up with ONT to SEA flights that won’t make your bank account wince. Ready to temporarily leave behind Los Angeles for new horizons? Browse through our cheap airfare, and filter by flight times and dates until you find just what you had in mind. From flights without layovers to ones that arrive early in the morning, you’ll come across plane tickets that suit your travel preferences. You can even bundle your flight to SEA with hotels and car rentals to score even bigger savings.

All set to hit the clouds? Book your travel arrangements with us today and have left-over money to put toward your travel outings and adventures.