$490 Cheap Flights from Seattle (SEA) to San Sebastian (EAS)

View $490 flight on Wed, Jan 14, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to San Sebastian (EAS)

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Cheap Flights from Seattle to San Sebastian (SEA-EAS)

Prices were available within the past 7 days and start at $490 for one-way flights and $578 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Iberia
Wed, Jan 7 - Tue, Jan 13
SEA
Seattle
EAS
San Sebastián
$578 Roundtrip, found 5 hours ago
$578
Roundtrip
found 5 hours ago
Select Iberia flight, departing Wed, Jan 7 from Seattle to San Sebastián, returning Tue, Jan 13, priced at $578 found 5 hours ago
Iberia
Wed, Jan 7 - Tue, Jan 13
SEA
Seattle
EAS
San Sebastián
$586 Roundtrip, found 5 hours ago
$586
Roundtrip
found 5 hours ago
Select Iberia flight, departing Wed, Jan 7 from Seattle to San Sebastián, returning Tue, Jan 13, priced at $586 found 5 hours ago
Iberia
Wed, Jan 7 - Tue, Jan 13
SEA
Seattle
EAS
San Sebastián
$595 Roundtrip, found 5 hours ago
$595
Roundtrip
found 5 hours ago
Select Iberia flight, departing Wed, Jan 7 from Seattle to San Sebastián, returning Tue, Jan 13, priced at $595 found 5 hours ago
Iberia
Wed, Jan 7 - Tue, Jan 13
SEA
Seattle
EAS
San Sebastián
$598 Roundtrip, found 5 hours ago
$598
Roundtrip
found 5 hours ago
Select Iberia flight, departing Wed, Jan 7 from Seattle to San Sebastián, returning Tue, Jan 13, priced at $598 found 5 hours ago
Iberia
Wed, Jan 7 - Tue, Jan 13
SEA
Seattle
EAS
San Sebastián
$606 Roundtrip, found 5 hours ago
$606
Roundtrip
found 5 hours ago
Select Iberia flight, departing Wed, Jan 7 from Seattle to San Sebastián, returning Tue, Jan 13, priced at $606 found 5 hours ago
American Airlines
Mon, Feb 2 - Mon, Feb 23
SEA
Seattle
EAS
San Sebastián
$631 Roundtrip, found 6 days ago
$631
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Feb 2 from Seattle to San Sebastián, returning Mon, Feb 23, priced at $631 found 6 days ago
Iberia
Mon, Feb 2 - Mon, Feb 23
SEA
Seattle
EAS
San Sebastián
$633 Roundtrip, found 6 days ago
$633
Roundtrip
found 6 days ago
Select Iberia flight, departing Mon, Feb 2 from Seattle to San Sebastián, returning Mon, Feb 23, priced at $633 found 6 days ago
American Airlines
Mon, Feb 2 - Mon, Feb 23
SEA
Seattle
EAS
San Sebastián
$637 Roundtrip, found 6 days ago
$637
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Feb 2 from Seattle to San Sebastián, returning Mon, Feb 23, priced at $637 found 6 days ago
American Airlines
Mon, Feb 2 - Mon, Feb 23
SEA
Seattle
EAS
San Sebastián
$641 Roundtrip, found 6 days ago
$641
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Feb 2 from Seattle to San Sebastián, returning Mon, Feb 23, priced at $641 found 6 days ago
British Airways
Fri, Jan 30 - Fri, Feb 6
SEA
Seattle
EAS
San Sebastián
$651 Roundtrip, found 5 days ago
$651
Roundtrip
found 5 days ago
Select British Airways flight, departing Fri, Jan 30 from Seattle to San Sebastián, returning Fri, Feb 6, priced at $651 found 5 days ago

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS) cost?
Grab a cheap one-way flight from $490 or cheap return flight from $578 from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS)?
The cheapest month to fly from SEA to EAS is January, when demand is low. Off-peak season is typically when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS)?
To find the cheapest airline flying from SEA to EAS, use Expedia's filter tool. Tailor your search based on what's important to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS)?
You'll have to catch a flight with a layover if you're traveling from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from SEA to EAS?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on various factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS)?
Select a flight from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS) that leaves before 3 PM to reduce the risk of cancellations and delays. Departures after this time have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS) last-minute?
Booking your plane ticket from SEA to EAS shortly before your trip is generally more expensive. However, if there's some wiggle room with your departure dates and times, you could land a cheap last-minute fare.
Is it cheaper to book a SEA to EAS flight and hotel package?
You can save money by securing a SEA to EAS flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. After selecting your ideal accommodations and flights, consider adding extras such as activities, car rentals and tours.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to San Sebastian Airport (EAS)?
Typically, it's possible to reschedule or cancel your SEA to EAS flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
San Sebastian
Airlines serving
American Airlines, Iberia
Roundtrip price
$578
Distance
5193 mi

Book with confidence

Seattle to San Sebastian Flights

The cheapest times to fly from Seattle to San Sebastian

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to San Sebastian are during the month of January. You can find some of the cheapest flights from Seattle to San Sebastian with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to San Sebastian

Sunday is one of the best days to book for cheap flights from Seattle to San Sebastian: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to San Sebastian

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to San Sebastian in 2025. You can also book with separate airlines for your outbound and return journeys, from $490 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to San Sebastian flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to San Sebastian airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Seattle to San Sebastian Flights

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*Available to One Key members.