Cheap Alaska Airlines flights Ontario (ONT) to Seattle (SEA)

You can find affordable round-trip Alaska Airlines flights from $137 from ONT to SEA by sorting your results from “Price (lowest to highest)” on Expedia. Or search for options for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

January is one of the least expensive months to jet off to Seattle with Alaska Airlines. You could also find excellent prices on one-way and return fares in February.

To find cheap Alaska Airlines fares from Los Angeles - Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. Airport (SEA), start searching one to three months before your planned departure. Reserving domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect the price you pay. Sunday is usually the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your flight on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Alaska Airlines has direct flights from Los Angeles - Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. Airport (SEA), with 22 departures each week. Just choose the “Nonstop” and “Airline” filters during your search on Expedia to find all direct Alaska Airlines flights to SEA.

From takeoff till landing, a direct Alaska Airlines flight from Los Angeles - Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. Airport (SEA) typically takes 2h 52m.

Alaska Airlines operates the most flights from Los Angeles - Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. Airport (SEA) on Wednesday. With up to 4 daily departures, you’ll get the most flexibility and choice on this day.

The earliest Alaska Airlines flight from ONT to SEA takes off at 6:00AM UTC-8, arriving at 8:54AM UTC-8. If you want to head off later, the last Alaska Airlines flight leaves ONT at 7:01PM UTC-8 and lands at SEA at 9:53PM UTC-8. Flying before midday is generally a smart choice as morning flights are less likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

Hop on an Alaska Airlines flight from Los Angeles - Ontario Intl. Airport (ONT) to Seattle, and you’re most likely to land at Seattle - Tacoma Intl. Airport (SEA). This is the airline’s primary hub in this city.

Alaska Airlines makes flying from ONT to SEA enjoyable with an excellent in-flight experience and a rewarding loyalty program. You could even start collecting points with Mileage Plan. Don’t forget to join Expedia’s free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

For the Los Angeles - Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. Airport (SEA) route, Alaska Airlines typically flies Boeing 737-800 and Boeing 737 MAX 9 planes. Keep in mind that last-minute changes are possible for operational purposes, meaning your flight may be on a different aircraft.

Changes are usually free within 24 hours of making a booking, but your airline may add a charge after that time. For more details about modifying your flights, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to change your plans without additional charges, apply the “No cancel fee” or “Changes included” filter when organizing your next trip.