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$439+ Cheap flights from Washington 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 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BIO
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Washington to Bilbao

Cheapest flights from Washington to Bilbao
Explore the most affordable flight options available from Washington to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/222:00 pmSEA - BIO
1 stop17h 40mLufthansa
Sun 12/287:25 amBIO - SEA
1 stop14h 55mLufthansa
Deal found 12/16$2,016
This Mytrip deal was found by Cheapflights users on 12/16. 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.
Mon 12/225:40 pmSEA - BIO
3 stops31h 45mMultiple Airlines
Sun 12/289:05 pmBIO - SEA
3 stops27h 35mMultiple Airlines
Deal found 12/16$2,116
This lastminute.com deal was found by Cheapflights users on 12/15. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/171:25 pmPDX - BIO
1 stop12h 55mKLM
Tue 1/65:20 pmBIO - PDX
1 stop27h 05mKLM
Deal found 12/15$2,429
This Mytrip deal was found by Cheapflights users on 12/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/171:25 pmPDX - BIO
2 stops18h 35mMultiple Airlines
Tue 1/611:25 amBIO - PDX
3 stops33h 00mMultiple Airlines
Deal found 12/15$3,509

Find flight deals from Washington to Bilbao

Keep the following information in mind while searching for Washington to Bilbao flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$439
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,110
Provider with most accurate pricing for Seattle/Tacoma Intl-Bilbao flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Bilbao flights.
Search Deals
From Washington 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 Washington 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 18, 2025.
Use the filters below to find and compare flights from Washington to Bilbao that are best for you.

Fly from

Washington

Fly to

Bilbao

Route

Depart

Return

Price

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 1/31

2:00 pm-4:40 pm

1 stop17h 40m

Bilbao

Sat 2/7

11:35 am-7:16 pm

2 stops40h 41m

$439

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 3/4

7:00 am-9:55 pm

2 stops29h 55m

Bilbao

Wed 3/11

7:25 am-2:20 pm

1 stop14h 55m

$460

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

Thu 1/29

1:40 pm-11:30 am

1 stop12h 50m

Bilbao

Tue 2/10

6:50 am-11:40 am

1 stop13h 50m

$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

Mon 1/26

2:10 pm-5:20 pm

1 stop18h 10m

Bilbao

Tue 2/10

6:50 am-11:40 am

1 stop13h 50m

$471

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Fri 1/30

2:10 pm-5:20 pm

1 stop18h 10m

Bilbao

Tue 2/10

6:50 am-11:40 am

1 stop13h 50m

$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

Sun 2/1

2:15 pm-5:20 pm

1 stop18h 05m

Bilbao

Tue 2/10

6:50 am-11:40 am

1 stop13h 50m

$471

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Tue 1/27

1:40 pm-5:20 pm

1 stop18h 40m

Bilbao

Tue 2/10

6:50 am-11:40 am

1 stop13h 50m

$471

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 24 results
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Best time to book a flight from Washington to Bilbao

Have a flexible travel schedule? Discover the best time to fly to Bilbao from Washington 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 Washington to Bilbao

What is the cheapest month to book a flight from State of Washington to Bilbao?

Currently, January is the cheapest month in which you can book a flight from State of Washington to Bilbao (average of $484). Flying from State of Washington 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 WA to BIO?

Find hourly flight availability from Washington 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 18, 2025.

It’s optimal to fly from State of Washington to Bilbao in the evening. By choosing this option you can save up to 49% on the cost of your flight, compared to a flight at noon.

Related info for your journey

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

  • What airport do you fly into for flights to Bilbao from Washington?

    Bilbao (BIO), located 3.0 mi from the city center, is the airport you fly into when you book flights from Washington to Bilbao.

  • How long is the flight from State of Washington to Bilbao?

    There are many flights that can get you from State of Washington to Bilbao in 12h 50m. Fly via Lufthansa, Delta, or KLM to get the fastest option. There are 5159 mi between State of Washington and Bilbao. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from State of Washington to Bilbao?

    The most popular flight routes from State of Washington to Bilbao are Seattle/Tacoma Intl - Bilbao, Portland - Bilbao and Pasco Tri Cities - Bilbao.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to Bilbao?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to Bilbao (average of $484). Flying from State of Washington 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 Washington 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 Washington to Bilbao

Discover the top 4 airlines that operate flights from Washington 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 18, 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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