Vuelos de Delta de Aeropuerto Internacional LA/Ontario (ONT) a Seattle (SEA) desde $149

For information on any current Seattle - Tacoma Intl. Airport (SEA) quarantine requirements and travel advice, visit our Covid-19 Travel Advisor. Look before you book your flight, so you don’t get caught up.

If you’re flying from ONT to SEA with Delta Air Lines, you’ll most likely be departing from terminal 2. Your airline should be able to let you know exactly which terminal you’ll be arriving at.

With Delta Air Lines offering nonstop services between ONT and Seattle - Tacoma Intl. Airport (SEA), your next grand adventure is a single flight away. Say goodbye to the stress, inconvenience and delays that are often associated with stopovers, and book your seat today.

From the time your Delta Air Lines plane pushes back from the gate at ONT to the moment it pulls into Seattle - Tacoma Intl. Airport (SEA), your trip will take roughly 3 hours and 33 minutes. With a quick flight time like this, it’s a fantastic spur-of-the-moment vacation.

Delta Air Lines typically operates the Embraer 175 when flying the ONT to SEA route.

If you’re traveling from ONT to SEA, you’ll find there are roughly 3 Delta Air Lines daily flights to select from.

For more info about changing your flight to SEA, please visit our Customer Service Portal.

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.

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.

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.