$70 Cheap Flights from Ontario to Seattle

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly from Los Angeles - Ontario Intl. to Seattle - Tacoma Intl.

Amazing ONT to SEA Flight Deals

The cheapest flights to Seattle - Tacoma Intl. found within the past 7 days were $143 round trip and $70 one way. Prices and availability subject to change. Additional terms may apply.

Flight Schedule for ONT to SEA

CarrierFlightDepart ONTArrive SEATue
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Stops
DL390906:10 am08:55 amCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
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AS101106:15 am08:57 amCheck FareCheck Fare
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AS61509:35 am00:17 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
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DL365911:50 am02:37 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
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AS73402:58 pm05:39 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
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DL368005:55 pm08:40 pmCheck FareCheck FareCheck FareCheck Fare
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AS42308:30 pm11:15 pmCheck FareCheck FareCheck FareCheck Fare
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AS52306:00 am08:47 am
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Frequently asked questions

Can I catch a flight from ONT to Seattle - Tacoma Intl. Airport (SEA) right now?
It’s always prudent to know about any travel advice reports and quarantine requirements in effect in your destination. Be sure to visit our Covid-19 Travel Advisor for up-to-date information on catching a flight to Seattle - Tacoma Intl. Airport (SEA) from Ontario Airport.
Are there direct flights from ONT to Sea-Tac Airport?
Multiple airlines offer direct flights from Los Angeles - Ontario Intl. Airport (ONT) to SEA. These include Alaska Airlines and Delta — start with them if you want to touch down at Seattle sooner rather than later.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to SEA, please visit our Customer Service Portal.
How long is the flight from ONT to Sea-Tac Airport?
Getting from Los Angeles - Ontario Intl. Airport (ONT) to Sea-Tac Airport shouldn’t be too laborious, with flights taking 2 hours and 44 minutes on average. With such a quick journey ahead of you, you’ll hit the tarmac feeling relaxed and ready to enjoy the next leg of your trip.
What is the flight distance from Ontario Airport to Seattle - Tacoma Intl. Airport (SEA)?
There’s a flight distance of 960 mi between Ontario Airport and Sea-Tac Airport. This is classified as a medium-haul flight. There’ll be plenty of time to watch the in-flight entertainment and squeeze in a snooze if you’re feeling tired.
What airlines fly from Ontario Airport to SEA?
If you need to get to Seattle from Ontario, there are a number of airlines with direct flights. One of the most popular is Alaska Airlines (AS), which offers 108 flights on this route each month. An alternative is Delta (DL), which offers 91 flights every month. The more air carriers you consider, the more likely you are to snap up a sensational deal.
What airlines have practices regarding COVID-19 in place and use social distancing?
From the moment you enter the departure terminal to when you leave the arrivals terminal, if you’re flying with Alaska Airlines, Delta or Southwest Airlines you can be sure that COVID-19 measures and social distancing rules have been adhered to. Many airlines have introduced capped capacity flights and keeping the middle seat empty.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It’s possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

 

Traveling From Los Angeles - Ontario Intl.
Traveling To Seattle - Tacoma Intl.
Shortest Flight Time 2 hours 47 mins
Earliest Departure Time 6:00AM PDT
Latest Departure Time 8:25PM PDT
Lowest Flight Price $143

Route Info

Flight path for flights from LA/Ontario International Airport to Seattle-Tacoma International Airport.

Distance:
1,047.00 miles

Discover our best flights from Ontario ONT to Seattle SEA. 

With 20 airlines to choose from on Travelocity, you can easily find the best option for you. Use our filters to sort by price, compare airlines, and find the most convenient flight times. 

 

Find our best return flights from Ontario ONT to Seattle SEA at the right price  

Airfares to Seattle SEA from Ontario ONT currently cost between $143 and $163. It’s usually cheaper to book a round trip than two separate one-way flights. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way flights from Ontario ONT to Seattle SEA 

If you want to be flexible about when you return, or keep your travel options open ended, a one-way flight could be just the ticket! You’ll find one-way airfares from Ontario ONT to Seattle SEA on Travelocity starting at $70. Prices and availability subject to change. Additional terms may apply. 

 

Get to Seattle SEA from Ontario ONT quicker with direct flights. 

Get to Seattle faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to SEA from ONT to take around 2 hour(s) 47 min(s).  

 

Find our cheapest airfares for flights from Ontario ONT to Seattle SEA

Find cheap flight deals by using our search filters to sort results starting with the lowest price airfares to SEA from ONT. Our Price Match Promise means if you find a lower rate on Travelocity.com or on another US-based website within 24 hours of booking, we’ll credit or refund the difference.  

 

Get our best airfare deals for your flight from Ontario ONT to Seattle SEA today 

If you’re flexible about when you travel, October is usually the cheapest month to fly from Ontario ONT to Seattle SEA. If you need to be more specific, search by date and arrival and departure times.Then, compare prices across different airlines, and sort results by lowest price first. 

 

Book flexible airline tickets for flights to Seattle SEA from Ontario ONT 

Some airlines let you change your travel dates without charging a fee. Use our ‘no change fee’ filter to see which flights to SEA from ONT have this option.  

 

Travel with confidence when you book flights to Seattle SEA from Ontario ONT with Travelocity 

We’ve secured fantastic deals with all the main airline carriers and it’s easy to compare, choose, and book with Travelocity. With 24/7 customer service and our free 'App', we’ll always keep you moving. 

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.