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Bilbao

$553+ 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 11/22. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BIO
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap 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 September 15, 2025.

Round-trip from

$553
(Gotogate)

Popular in

June

Cheapest in

October

Average price

$1,114
From Seattle/Tacoma Intl to Bilbao
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Highest demand for flights based on searches. 15% potential increase in price ($192 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 15, 2025.

This Gotogate deal was found by Cheapflights users on 9/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/228:00 pmSEA - BIO
2 stops42h 05mMultiple Airlines
Tue 12/27:25 amBIO - SEA
2 stops40h 06mMultiple Airlines
Deal found 9/14$553
This Mytrip deal was found by Cheapflights users on 9/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/235:50 amSEA - BIO
2 stops27h 15mMultiple Airlines
Tue 12/27:25 amBIO - SEA
2 stops20h 51mMultiple Airlines
Deal found 9/14$555
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Sun 11/233:10 pmSEA - BIO
1 stop22h 55mUnited Airlines
Tue 12/26:45 amBIO - SEA
2 stops24h 31mUnited Airlines
Deal found 9/14$568
This United Airlines deal was found by Cheapflights users on 9/15. 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 11/2211:59 pmSEA - BIO
2 stops38h 06mUnited Airlines
Tue 12/26:45 amBIO - SEA
2 stops24h 31mUnited Airlines
Deal found 9/15$572
This FlightHub deal was found by Cheapflights users on 9/13. 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 11/228:00 pmSEA - BIO
2 stops37h 05mMultiple Airlines
Mon 12/112:50 pmBIO - SEA
1 stop32h 20mMultiple Airlines
Deal found 9/13$581
This Air Canada deal was found by Cheapflights users on 9/13. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/228:00 pmSEA - BIO
2 stops37h 05mAir Canada
Mon 12/111:35 amBIO - SEA
2 stops59h 56mAir Canada
Deal found 9/13$582
This United deal was found by Cheapflights users on 9/14. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2811:35 pmSEA - BIO
2 stops27h 15mMultiple Airlines
Mon 11/1012:50 pmBIO - SEA
1 stop32h 20mMultiple Airlines
Deal found 9/14$585
This KLM deal was found by Cheapflights users on 9/15. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:35 pmSEA - BIO
1 stop30h 50mKLM
Fri 10/106:50 amBIO - SEA
1 stop18h 15mKLM
Deal found 9/15$591
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Wed 10/291:20 pmSEA - BIO
2 stops25h 45mUnited Airlines
Wed 11/511:35 amBIO - SEA
2 stops43h 41mUnited Airlines
Deal found 9/14$593

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 September 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

Sat 11/22

8:00 pm-11:05 pm

2 stops42h 05m

Bilbao

Tue 12/2

7:25 am-2:31 pm

2 stops40h 06m

$553

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 11/23

5:50 am-6:05 pm

2 stops27h 15m

Bilbao

Tue 12/2

7:25 am-7:16 pm

2 stops20h 51m

$555

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 11/23

3:10 pm-11:05 pm

1 stop22h 55m

Bilbao

Tue 12/2

6:45 am-10:16 pm

2 stops24h 31m

$568

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 11/22

11:59 pm-11:05 pm

2 stops38h 06m

Bilbao

Tue 12/2

6:45 am-10:16 pm

2 stops24h 31m

$572

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 2/4

7:00 am-10:50 am

2 stops18h 50m

Bilbao

Wed 2/25

12:50 pm-12:59 am

2 stops21h 09m

$577

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 11/22

8:00 pm-6:05 pm

2 stops37h 05m

Bilbao

Mon 12/1

11:35 am-2:31 pm

2 stops59h 56m

$582

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

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 $541). Flying from Seattle to Bilbao in June is currently the most expensive (average of $1,136). 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 September 15, 2025.

It’s optimal to fly from Seattle to Bilbao in the morning. By choosing this option you can save up to 43% 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 September 15, 2025.
Peruse reviews from past customers who have flown with Delta, KLM, and Air France 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
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,954 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,385 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.4
Good
1,469 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,929 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Lufthansa
6.8
Okay
7,407 reviews
Delta
8.0
Very good
7,954 reviews

Crew

8.5

Overall

8.0

Food

7.3

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

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

    Cheapflights users have booked flights from Seattle to Bilbao round-trip from $596. Other airlines that can offer you cheap pricing are Air France, from $675, and KLM, from $702. United Airlines is 43% 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 $541). Flying from Seattle to Bilbao in June is currently the most expensive (average of $1,136). 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.
Portland to Bilbao flights
Pasco to Bilbao flights
Seattle to San Sebastian flights

Top 5 airlines flying from Seattle to Bilbao

Discover the top 5 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$596Average$1,147FlexibilityNo cancel feeOn-time69%
Air FranceCheapest$675Average$968FlexibilityNo cancel feeOn-time77%
KLMCheapest$702Average$1,064FlexibilityNo cancel feeOn-time75%
DeltaCheapest$730Average$1,110FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$749Average$1,076FlexibilityNo cancel feeOn-time76%

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