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Bilbao

$433+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BIO
Aug 21 — Aug 281
Fri 8/21
Fri 8/28
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 July 22, 2026.

This Orbitz deal was found by Cheapflights users on 7/22. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/810:10 am
SEA
-
BIO
2 stops27h 55m
Multiple Airlines
Wed 11/185:50 pm
BIO
-
SEA
1 stop27h 10m
Multiple Airlines
Deal found 7/22$700
This oojo deal was found by Cheapflights users on 7/22. 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 11/82:50 pm
SEA
-
BIO
1 stop18h 15m
Lufthansa
Wed 11/187:25 am
BIO
-
SEA
1 stop14h 35m
Lufthansa
Deal found 7/22$721
This Air Canada deal was found by Cheapflights users on 7/18. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/193:00 pm
SEA
-
BIO
2 stops17h 55m
Air Canada
Thu 10/226:50 am
BIO
-
SEA
2 stops24h 52m
Air Canada
Deal found 7/18$727
This United Airlines deal was found by Cheapflights users on 7/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/192:10 pm
SEA
-
BIO
1 stop14h 10m
United Airlines
Thu 10/226:50 am
BIO
-
SEA
1 stop14h 30m
United Airlines
Deal found 7/20$739
This Gotogate deal was found by Cheapflights users on 7/20. 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 10/1110:30 am
SEA
-
BIO
2 stops22h 25m
Multiple Airlines
Wed 10/216:50 am
BIO
-
SEA
2 stops16h 32m
Multiple Airlines
Deal found 7/20$756
This oojo deal was found by Cheapflights users on 7/18. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/276:50 pm
SEA
-
BIO
1 stop14h 05m
Lufthansa
Thu 10/86:50 am
BIO
-
SEA
1 stop14h 30m
Lufthansa
Deal found 7/18$772

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 July 22, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$700
(Orbitz)

One-way from

$433
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$1,064
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. 19% potential increase in price ($201 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 22, 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

Mon 10/19

2:10 pm-1:20 pm

1 stop14h 10m

Bilbao

Thu 10/22

6:50 am-12:20 pm

1 stop14h 30m

$739
Quickest round-trip

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 9/27

6:50 pm-5:55 pm

1 stop14h 05m

Bilbao

Thu 10/8

6:50 am-12:20 pm

1 stop14h 30m

$779

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sun 9/27

6:00 am-9:50 am

2 stops18h 50m

Bilbao

Thu 10/8

6:45 am-4:37 pm

2 stops18h 52m

$801

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Tue 9/1

1:00 pm-10:25 pm

2 stops48h 25m

Bilbao

Tue 9/8

11:10 am-6:32 pm

2 stops40h 22m

$867

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 8/22

5:15 pm-5:55 pm

2 stops39h 40m

Bilbao

Sat 9/5

6:50 am-11:55 am

1 stop14h 05m

$884

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Thu 9/10

8:10 am-5:55 pm

2 stops24h 45m

Bilbao

Mon 9/14

2:10 pm-11:55 am

1 stop30h 45m

$902

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Thu 8/6

7:15 pm-11:10 am

1 stop30h 55m

Bilbao

Thu 8/20

6:20 pm-5:20 pm

1 stop32h 00m

$1,140
Cheapest one-way

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Mon 9/7

6:45 pm-10:00 pm

1 stop18h 15m

$463

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Mon 9/7

1:24 pm-11:15 pm

2 stops24h 51m

$472

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Fri 8/14

11:25 pm-8:05 am

2 stops23h 40m

$491

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/21

Showing 1-10 of 13 resultsSorted by cheapest first
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 July.
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 far ahead should I book a flight from Seattle to Bilbao?

The best time to book flights from Seattle to Bilbao is 70 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 July 22, 2026.
Peruse reviews from past customers who have flown with KLM,Delta, 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.
KLM
7.8
Good
1,544 reviews

Food

7.3

Comfort

7.7

Entertainment

7.2

Crew

8.4

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
KLM
7.8
Good
1,544 reviews
KLM
7.8
Good
1,544 reviews

Food

7.3

Comfort

7.7

Entertainment

7.2

Crew

8.4

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Delta
7.8
Good
8,479 reviews
KLM
7.8
Good
1,544 reviews

Food

7.3

Comfort

7.7

Entertainment

7.2

Crew

8.4

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
United Airlines
7.4
Good
10,024 reviews
KLM
7.8
Good
1,544 reviews

Food

7.3

Comfort

7.7

Entertainment

7.2

Crew

8.4

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Lufthansa
6.8
Okay
8,159 reviews
KLM
7.8
Good
1,544 reviews

Food

7.3

Comfort

7.7

Entertainment

7.2

Crew

8.4

Overall

7.8

Boarding

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

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 14h 05m. Fly via United Airlines or Lufthansa 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 $522, and KLM, from $586. 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.

See more FAQs

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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 July 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$484Average$939FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$522Average$897FlexibilityNo cancel feeOn-time76%
KLMCheapest$586Average$1,064FlexibilityNo cancel feeOn-time75%
DeltaCheapest$731Average$1,048FlexibilityNo cancel feeOn-timeN/A

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