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Bilbao

$355+ 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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BIO
Jun 19 — Jun 261
Fri 6/19
Fri 6/26
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 May 20, 2026.

This Gotogate deal was found by Cheapflights users on 5/20. 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.
Sun 10/112:10 pm
SEA
-
BIO
1 stop24h 15m
Multiple Airlines
Thu 10/296:45 am
BIO
-
SEA
2 stops19h 37m
Multiple Airlines
Deal found 5/20$716
This Gotogate deal was found by Cheapflights users on 5/18. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/112:10 pm
SEA
-
BIO
1 stop14h 10m
Multiple Airlines
Tue 10/276:45 am
BIO
-
SEA
2 stops19h 37m
Multiple Airlines
Deal found 5/18$718
This Gotogate deal was found by Cheapflights users on 5/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/222:10 pm
SEA
-
BIO
1 stop18h 00m
Multiple Airlines
Thu 10/16:50 am
BIO
-
SEA
2 stops16h 32m
Multiple Airlines
Deal found 5/16$720
This oojo deal was found by Cheapflights users on 5/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/112:10 pm
SEA
-
BIO
1 stop14h 10m
Lufthansa
Thu 10/296:45 am
BIO
-
SEA
1 stop14h 15m
Lufthansa
Deal found 5/20$723
This oojo deal was found by Cheapflights users on 5/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/112:10 pm
SEA
-
BIO
1 stop14h 10m
Lufthansa
Wed 10/287:25 am
BIO
-
SEA
1 stop14h 35m
Lufthansa
Deal found 5/20$725
This United Airlines deal was found by Cheapflights users on 5/15. 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.
Tue 9/227:30 am
SEA
-
BIO
1 stop18h 15m
United Airlines
Thu 10/16:50 am
BIO
-
SEA
1 stop14h 30m
United Airlines
Deal found 5/15$726
This Delta deal was found by Cheapflights users on 5/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/206:45 pm
SEA
-
BIO
1 stop13h 45m
Delta
Tue 9/296:45 am
BIO
-
SEA
1 stop14h 02m
Delta
Deal found 5/15$727
This Gotogate deal was found by Cheapflights users on 5/20. 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.
Sun 10/118:00 am
SEA
-
BIO
2 stops20h 20m
Multiple Airlines
Wed 10/287:25 am
BIO
-
SEA
1 stop14h 35m
Multiple Airlines
Deal found 5/20$728
This United Airlines deal was found by Cheapflights users on 5/15. 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.
Sun 9/206:50 pm
SEA
-
BIO
1 stop19h 35m
United Airlines
Wed 9/306:50 am
BIO
-
SEA
1 stop14h 05m
United Airlines
Deal found 5/15$729
This United Airlines deal was found by Cheapflights users on 5/15. 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.
Mon 9/2111:04 pm
SEA
-
BIO
2 stops26h 41m
United Airlines
Wed 9/306:50 am
BIO
-
SEA
2 stops20h 42m
United Airlines
Deal found 5/15$730
This Delta deal was found by Cheapflights users on 5/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:20 am
SEA
-
BIO
2 stops25h 10m
Delta
Mon 9/2812:00 pm
BIO
-
SEA
1 stop32h 47m
Delta
Deal found 5/15$731

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 May 20, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$716
(Gotogate)

One-way from

$355
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$1,024
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
One-way flight from Seattle/Tacoma Intl to Bilbao
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($242 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

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 May 20, 2026.
Use the filters below to find and compare flights from Seattle to Bilbao that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Tue 9/29

1:30 pm-5:30 pm

1 stop19h 00m

Bilbao

Fri 10/9

6:45 am-11:52 am

1 stop14h 07m

$726
Quickest round-trip

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Tue 9/22

7:30 am-10:45 am

1 stop18h 15m

Bilbao

Wed 9/30

6:50 am-11:55 am

1 stop14h 05m

$726

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Tue 9/22

7:30 am-10:45 am

1 stop18h 15m

Bilbao

Thu 10/1

6:50 am-10:42 pm

2 stops24h 52m

$726

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 9/20

6:50 pm-11:25 pm

1 stop19h 35m

Bilbao

Thu 10/1

6:50 am-12:20 pm

1 stop14h 30m

$729

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 10/11

10:58 pm-4:00 pm

2 stops32h 02m

Bilbao

Wed 10/28

7:25 am-8:54 pm

2 stops21h 29m

$743

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 10/11

10:58 pm-4:00 pm

2 stops32h 02m

Bilbao

Thu 10/29

6:45 am-11:21 pm

3 stops24h 36m

$744

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 10/17

10:58 pm-11:25 pm

2 stops39h 27m

Bilbao

Wed 10/21

6:50 am-12:20 pm

1 stop14h 30m

$745

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Tue 9/1

12:00 pm-4:30 pm

2 stops19h 30m

Bilbao

Tue 9/8

6:45 am-4:55 pm

2 stops19h 10m

$777

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 9/27

6:50 pm-11:25 pm

1 stop19h 35m

Bilbao

Sat 10/17

6:50 am-9:56 pm

3 stops24h 06m

$788

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Tue 9/1

11:48 am-11:15 pm

2 stops26h 27m

Bilbao

Tue 9/8

6:45 am-11:50 pm

2 stops26h 05m

$811

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/15

Showing 1-10 of 21 resultsSorted by cheapest first
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2
3

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 May.
ProviderPrice AccuracyTrust Score*
OvagoPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 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 Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Seattle-Bilbao flight deals on Cheapflights vs. Ovago >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 Ovago the most. Ovago 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

How much does it cost to fly round-trip from Seattle to Bilbao?

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 May 20, 2026.
Peruse reviews from past customers who have flown with Delta,KLM, andUnited 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
8,452 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.9
Good
8,452 reviews
Delta
7.9
Good
8,452 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
KLM
7.8
Good
1,518 reviews
Delta
7.9
Good
8,452 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
9,742 reviews
Delta
7.9
Good
8,452 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Lufthansa
6.8
Okay
8,015 reviews
Delta
7.9
Good
8,452 reviews

Entertainment

7.8

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.8

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 15m. Fly via KLM or United Airlines 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 $484. Other airlines that can offer you cheap pricing are Lufthansa, from $514, and KLM, from $586. United Airlines is 49% 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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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 May 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$484Average$940FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$514Average$898FlexibilityNo cancel feeOn-time76%
KLMCheapest$586Average$1,220FlexibilityNo cancel feeOn-time75%
DeltaCheapest$731Average$1,051FlexibilityNo cancel feeOn-timeN/A

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