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Bilbao

$460+ Cheap flights from Seattle (SEA) to Bilbao (BIO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BIO
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap flight deals from Seattle to Bilbao

Cheapest flights from Seattle to Bilbao
Explore the most affordable flight options available from Seattle to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This Air Europa deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Europa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:10 amSEA - BIO
2 stops23h 50mMultiple Airlines
Wed 1/79:05 pmBIO - SEA
2 stops55h 55mMultiple Airlines
Deal found 12/14$2,095
This FlightHub deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:00 pmSEA - BIO
1 stop31h 00mTurkish Airlines
Wed 1/75:10 pmBIO - SEA
1 stop32h 55mTurkish Airlines
Deal found 12/14$2,143
This FlightHub deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/203:40 pmSEA - BIO
2 stops40h 00mLufthansa
Wed 1/75:40 pmBIO - SEA
2 stops52h 40mLufthansa
Deal found 12/14$2,178
This KAYAK deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:00 pmSEA - BIO
1 stop31h 00mTurkish Airlines
Mon 12/2912:00 pmBIO - SEA
1 stop38h 05mTurkish Airlines
Deal found 12/14$2,193
This Ovago deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/203:40 pmSEA - BIO
2 stops40h 00mLufthansa
Mon 12/295:35 pmBIO - SEA
1 stop27h 35mLufthansa
Deal found 12/14$2,229
This United Airlines deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/201:35 pmSEA - BIO
3 stops41h 35mUnited Airlines
Mon 12/2911:35 amBIO - SEA
2 stops44h 37mUnited Airlines
Deal found 12/14$2,885

Find flight deals from Seattle to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Bilbao (BIO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$456
(Cheapflightsfares)

Popular in

June

Cheapest in

January

Average price

$1,110
Provider with most accurate pricing for Seattle/Tacoma Intl-Bilbao flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Bilbao flights.
Search Deals
From Seattle/Tacoma Intl to Bilbao
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($260 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($47 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Bilbao that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from Seattle to Bilbao that are best for you.

Fly from

Seattle

Fly to

Bilbao

Route

Depart

Return

Price

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Thu 1/29

2:10 pm-9:55 pm

2 stops22h 45m

Bilbao

Sun 2/8

7:25 am-7:16 pm

2 stops20h 51m

$460

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Fri 1/30

2:10 pm-10:25 pm

1 stop23h 15m

Bilbao

Sun 2/8

5:20 pm-11:40 am

1 stop27h 20m

$471

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Thu 1/29

1:40 pm-11:30 am

1 stop12h 50m

Bilbao

Sun 2/8

5:20 pm-11:40 am

1 stop27h 20m

$471

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Fri 1/30

7:00 am-11:20 pm

2 stops31h 20m

Bilbao

Sun 2/8

7:25 am-7:16 pm

2 stops20h 51m

$471

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Thu 1/29

1:40 pm-11:30 am

1 stop12h 50m

Bilbao

Thu 2/5

5:20 pm-11:40 am

1 stop27h 20m

$471

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 4/26

2:05 pm-10:00 pm

2 stops22h 55m

$576

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 4/26

6:45 pm-5:30 pm

1 stop13h 45m

$580

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Fri 12/26

2:54 pm-5:55 pm

3 stops42h 01m

$706

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Thu 6/11

6:45 pm-5:30 pm

1 stop13h 45m

$895

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Fri 12/26

8:05 pm-3:15 pm

1 stop34h 10m

$953

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

Showing 1-10 of 12 results
1
2

Compare providers for flights from Seattle to Bilbao

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Bilbao in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Bilbao flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Bilbao flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Seattle-Bilbao flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Bilbao flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Bilbao flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Bilbao

Have a flexible travel schedule? Discover the best time to fly to Bilbao from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Bilbao

What is the cheapest month to book a flight from Seattle to Bilbao?

Currently, January is the cheapest month in which you can book a flight from Seattle to Bilbao (average of $484). Flying from Seattle to Bilbao in June is currently the most expensive (average of $1,288). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to BIO?

Find hourly flight availability from Seattle to Bilbao. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 15, 2025.

It’s optimal to fly from Seattle to Bilbao in the evening. By choosing this option you can save up to 48% on the cost of your flight, compared to a flight at noon.

Reviews of airlines servicing Bilbao

Get insights into the airlines that provide service to Bilbao. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Bilbao. Reviews last updated December 15, 2025.
Peruse reviews from past customers who have flown with Delta, KLM, and United Airlines from Seattle to Bilbao to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,010 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,010 reviews
Delta
7.9
Good
8,010 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
KLM
7.7
Good
1,432 reviews
Delta
7.9
Good
8,010 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,094 reviews
Delta
7.9
Good
8,010 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Lufthansa
6.8
Okay
7,631 reviews
Delta
7.9
Good
8,010 reviews

Overall

7.9

Comfort

7.9

Entertainment

7.9

Food

7.3

Boarding

8.1

Crew

8.5

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Bilbao. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Bilbao?

    There are many flights that can get you from Seattle to Bilbao in 22h 45m. Fly via Lufthansa to get the fastest option. Seattle and Bilbao are separated by a distance of 5159 mi.

  • What are the cheapest airlines flying from Seattle to Bilbao round-trip?

    Cheapflights users have booked flights from Seattle to Bilbao round-trip from $484. Other airlines that can offer you cheap pricing are United Airlines, from $484, and KLM, from $586. Lufthansa is 50% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Seattle to Bilbao that include hotel bookings?

    Yes. In addition to deals on Seattle to Bilbao flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Bilbao?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Bilbao.

  • Can I find deals for business class flights from Seattle to Bilbao?

    Yes. Cheapflights offers flight deals from Seattle to Bilbao by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Bilbao?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Bilbao (average of $484). Flying from Seattle to Bilbao in June is currently the most expensive (average of $1,288). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Seattle to Bilbao

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Seattle to Bilbao

Discover the top 4 airlines that operate flights from Seattle to Bilbao. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$484Average$995FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$484Average$918FlexibilityNo cancel feeOn-time76%
KLMCheapest$586Average$1,064FlexibilityNo cancel feeOn-time75%
DeltaCheapest$731Average$1,080FlexibilityNo cancel feeOn-timeN/A

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