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Bilbao

$289+ Cheap flights from Seattle (SEA) to Bilbao (BIO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BIO
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
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 August 18, 2025.

Round-trip from

$641
(KLM)

One-way from

$289
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,091
From Seattle/Tacoma Intl to Bilbao
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One-way flight from Seattle/Tacoma Intl to Bilbao
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Highest demand for flights based on searches. 14% potential increase in price ($184 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 August 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 August 18, 2025.

This Delta deal was found by Cheapflights users on 8/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/224:55 pmSEA - BIO
2 stops33h 35mDelta
Tue 12/27:25 amBIO - SEA
2 stops22h 06mDelta
Deal found 8/18$635
This KLM deal was found by Cheapflights users on 8/18. 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 10/12:10 pmSEA - BIO
1 stop23h 35mKLM
Fri 10/107:10 amBIO - SEA
1 stop13h 05mKLM
Deal found 8/18$641
This Delta deal was found by Cheapflights users on 8/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/112:45 pmSEA - BIO
2 stops18h 45mDelta
Fri 10/107:10 amBIO - SEA
1 stop13h 05mDelta
Deal found 8/18$646
This Expedia deal was found by Cheapflights users on 8/18. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/221:59 pmSEA - BIO
2 stops37h 51mMultiple Airlines
Mon 12/19:35 pmBIO - SEA
2 stops52h 20mMultiple Airlines
Deal found 8/18$653
This Booking.com deal was found by Cheapflights users on 8/15. 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 Booking.com 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 stops40h 41mAir Canada
Deal found 8/15$711
This Delta deal was found by Cheapflights users on 8/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/225:50 pmSEA - BIO
2 stops32h 40mDelta
Mon 12/112:15 pmBIO - SEA
1 stop32h 10mDelta
Deal found 8/18$714
This United Airlines deal was found by Cheapflights users on 8/17. 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 stops31h 41mUnited Airlines
Mon 12/112:50 pmBIO - SEA
1 stop32h 20mUnited Airlines
Deal found 8/17$719

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 August 18, 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

Wed 10/1

2:10 pm-10:45 pm

1 stop23h 35m

Bilbao

Fri 10/10

7:10 am-11:15 am

1 stop13h 05m

$641

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 10/1

12:45 pm-4:30 pm

2 stops18h 45m

Bilbao

Fri 10/10

7:10 am-11:15 am

1 stop13h 05m

$646

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 10/1

7:00 am-6:20 pm

2 stops26h 20m

Bilbao

Fri 10/10

6:45 am-6:36 pm

2 stops20h 51m

$735

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 9/27

2:55 pm-1:25 pm

2 stops37h 30m

Bilbao

Sun 10/12

6:45 am-11:55 am

1 stop14h 10m

$795

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 9/27

7:15 pm-6:25 pm

2 stops38h 10m

Bilbao

Sun 10/12

6:45 am-9:21 am

2 stops35h 36m

$795

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 9/27

6:45 pm-10:25 am

1 stop30h 40m

Bilbao

Sun 10/12

5:15 pm-11:50 am

1 stop27h 35m

$801

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 10/8

1:02 pm-5:15 pm

2 stops43h 13m

$289

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 11/2

3:10 pm-6:35 pm

2 stops18h 25m

$308

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 10/8

6:50 pm-5:50 pm

1 stop14h 00m

$482

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 9/27

7:35 pm-5:30 pm

1 stop12h 55m

$487

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 12 results
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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 $1,139). 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 August 18, 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 August 18, 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
7,981 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
7,981 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
1,468 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
8,925 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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
7,330 reviews
Delta
8.0
Very good
7,981 reviews

Crew

8.5

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

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.

  • How long is the flight from Seattle to Bilbao?

    There are many flights that can get you from Seattle to Bilbao in 18h 45m. Fly via KLM or Delta to get the fastest option. Seattle and Bilbao are separated by a distance of 5159 mi. This flight may include one or multiple stops.

  • 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 44% 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 $1,139). 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
Seattle to San Sebastian flights
Pasco to Bilbao 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 August 18, 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%
LufthansaCheapest$749Average$1,114FlexibilityNo cancel feeOn-time76%
DeltaCheapest$757Average$1,169FlexibilityNo cancel feeOn-timeN/A

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