$436 Cheap Flights from Seattle (SEA) to Bilbao (BIO)

View $436 flight on Mon, Jan 5, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Bilbao Airport (BIO)

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Cheap Flights from Seattle to Bilbao (SEA-BIO)

Prices were available within the past 7 days and start at $436 for one-way flights and $502 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Sat, Aug 22 - Fri, Sep 4
SEA
Seattle
BIO
Bilbao
$502 Roundtrip, found 2 days ago
$502
Roundtrip
found 2 days ago
Select Scandinavian Airlines flight, departing Sat, Aug 22 from Seattle to Bilbao, returning Fri, Sep 4, priced at $502 found 2 days ago
Scandinavian Airlines
Sun, Jan 18 - Fri, Jan 23
SEA
Seattle
BIO
Bilbao
$511 Roundtrip, found 4 days ago
$511
Roundtrip
found 4 days ago
Select Scandinavian Airlines flight, departing Sun, Jan 18 from Seattle to Bilbao, returning Fri, Jan 23, priced at $511 found 4 days ago
Lufthansa
Wed, Feb 4 - Wed, Feb 11
SEA
Seattle
BIO
Bilbao
$517 Roundtrip, found 3 days ago
$517
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Wed, Feb 4 from Seattle to Bilbao, returning Wed, Feb 11, priced at $517 found 3 days ago
Delta
Wed, Dec 31 - Thu, Jan 15
SEA
Seattle
BIO
Bilbao
$519 Roundtrip, found 2 days ago
$519
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Dec 31 from Seattle to Bilbao, returning Thu, Jan 15, priced at $519 found 2 days ago
Scandinavian Airlines
Sun, May 17 - Fri, May 22
SEA
Seattle
BIO
Bilbao
$521 Roundtrip, found 2 days ago
$521
Roundtrip
found 2 days ago
Select Scandinavian Airlines flight, departing Sun, May 17 from Seattle to Bilbao, returning Fri, May 22, priced at $521 found 2 days ago
Air Canada
Mon, Jan 26 - Mon, Feb 2
SEA
Seattle
BIO
Bilbao
$522 Roundtrip, found 1 day ago
$522
Roundtrip
found 1 day ago
Select Air Canada flight, departing Mon, Jan 26 from Seattle to Bilbao, returning Mon, Feb 2, priced at $522 found 1 day ago
Delta
Thu, Feb 12 - Tue, Feb 17
SEA
Seattle
BIO
Bilbao
$524 Roundtrip, found 19 hours ago
$524
Roundtrip
found 19 hours ago
Select Delta flight, departing Thu, Feb 12 from Seattle to Bilbao, returning Tue, Feb 17, priced at $524 found 19 hours ago
United
Wed, Dec 3 - Tue, Dec 16
SEA
Seattle
BIO
Bilbao
$529 Roundtrip, found 2 days ago
$529
Roundtrip
found 2 days ago
Select United flight, departing Wed, Dec 3 from Seattle to Bilbao, returning Tue, Dec 16, priced at $529 found 2 days ago
Air Canada
Mon, Jan 26 - Mon, Feb 2
SEA
Seattle
BIO
Bilbao
$532 Roundtrip, found 1 day ago
$532
Roundtrip
found 1 day ago
Select Air Canada flight, departing Mon, Jan 26 from Seattle to Bilbao, returning Mon, Feb 2, priced at $532 found 1 day ago
Swiss International Air Lines
Wed, Feb 4 - Wed, Feb 11
SEA
Seattle
BIO
Bilbao
$539 Roundtrip, found 3 days ago
$539
Roundtrip
found 3 days ago
Select Swiss International Air Lines flight, departing Wed, Feb 4 from Seattle to Bilbao, returning Wed, Feb 11, priced at $539 found 3 days ago

Alternative airports near Bilbao

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Bilbao Airport BIO. Cheapest and Closest option available. Average driving time to city center is 13 minutes. Flights from $720
BIO
Bilbao Airport
CheapestClosest
Average driving time to city center13 min
Flights from $720

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Bilbao Airport (BIO) cost?
Snag a cheap one-way flight from $436 or cheap return flight from $502 from Seattle - Tacoma Intl. Airport (SEA) to Bilbao Airport (BIO) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Bilbao Airport (BIO)?
August is the most affordable month to fly from SEA to BIO. Timing your trip outside of the busy season is often the key to better flight prices.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Bilbao Airport (BIO)?
To find the cheapest airline that'll fly you from SEA to BIO, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Bilbao Airport (BIO)?
Nonstop flights from Seattle - Tacoma Intl. Airport (SEA) to Bilbao Airport (BIO) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SEA to BIO?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary based on the airline, season and other factors.*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 Bilbao Airport (BIO)?
To arrive at Bilbao Airport (BIO) on time, opt for a flight that leaves from Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Bilbao Airport (BIO) last-minute?
Booking your flight from SEA to BIO shortly before your trip is generally more expensive. However, if you're flexible with your itinerary, you could score a cheap last-minute fare.
Is it cheaper to book a SEA to BIO flight and hotel package?
Compared with arranging flights and hotels separately, booking a SEA to BIO flight and hotel package with Expedia could result in significant savings. Better yet, having it all in one place will take the hassle out of travel planning. Simply pick your flights and choose from our extensive range of hotels, then tailor your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Bilbao Airport (BIO)?
If you reserved your SEA to BIO flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Bilbao
Airlines serving
Aer Lingus, Air Canada, Air Europa, Air France, American Airlines, Brussels Airlines, Delta, Finnair, Iberia, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United
Roundtrip price
$501
Distance
5161 mi

Book with confidence

Seattle to Bilbao Flights

The cheapest times to fly from Seattle to Bilbao

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 Bilbao are during the month of August. You can find some of the cheapest flights from Seattle to Bilbao with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Bilbao

Sunday is one of the best days to book for cheap flights from Seattle to Bilbao: 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 Bilbao

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 Bilbao in 2025. You can also book with separate airlines for your outbound and return journeys, from $436 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 Bilbao 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 Bilbao 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 Bilbao Flights

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*Available to One Key members.