$367+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BIO
Oct 11 — Oct 181
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Bilbao with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Seattle to Bilbao
Cheapest
Best
Last-minute
One-way
Cheapest flights from Seattle to BilbaoExplore 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 11, 2026.
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 11, 2026.
This United Airlines deal was found by Cheapflights users on 9/9. 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 -
1 stop18h 15m
Tue 10/611:55 am -
1 stop14h 04m
Deal found 9/9![United Airlines logo]()
$592
This FlightHub deal was found by Cheapflights users on 9/10. 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.
Tue 9/226:50 pm -
1 stop19h 35m
Tue 10/68:55 pm -
2 stops30h 37m
Deal found 9/10![Multiple Airlines logo]()
$597
This American Airlines deal was found by Cheapflights users on 9/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/26:45 pm -
2 stops19h 30m
Tue 12/159:15 am -
2 stops21h 44m
Deal found 9/10![Multiple Airlines logo]()
$600
This FlightHub deal was found by Cheapflights users on 9/10. 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.
Tue 9/226:50 pm -
1 stop14h 05m
Tue 10/67:15 am -
1 stop18h 44m
Deal found 9/10![Lufthansa logo]()
$607
This Justfly.com deal was found by Cheapflights users on 9/9. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/276:50 pm -
1 stop19h 35m
Thu 10/86:50 am -
2 stops16h 32m
Deal found 9/9![Lufthansa logo]()
$610
This United Airlines deal was found by Cheapflights users on 9/10. 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 9/276:50 pm -
1 stop19h 35m
Thu 10/811:55 am -
1 stop14h 04m
Deal found 9/10![United Airlines logo]()
$611
This FlightHub deal was found by Cheapflights users on 9/10. 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.
Wed 12/22:50 pm -
1 stop22h 05m
Tue 12/1511:45 am -
1 stop34h 15m
Deal found 9/10![Lufthansa logo]()
$618
This Expedia deal was found by Cheapflights users on 9/11. 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.
Mon 10/266:12 am -
2 stops22h 38m
Mon 11/29:35 pm -
2 stops31h 45m
Deal found 9/11![Iberia logo]()
$634
Best flights from Seattle to BilbaoDiscover carefully curated flight deals from Seattle to Bilbao that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.
Discover carefully curated flight deals from Seattle to Bilbao that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.
This United Airlines deal was found by Cheapflights users on 9/9. 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 -
1 stop18h 15m
Tue 10/611:55 am -
1 stop14h 04m
Deal found 9/9![United Airlines logo]()
$592
This Delta deal was found by Cheapflights users on 9/10. 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 1/124:05 pm -
1 stop34h 25m
Fri 1/226:50 am -
1 stop14h 00m
Deal found 9/10![Delta logo]()
$698
This Mytrip deal was found by Cheapflights users on 9/11. 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 10/263:35 pm -
3 stops35h 45m
Mon 11/25:20 pm -
3 stops32h 40m
Deal found 9/11![Multiple Airlines logo]()
$793
This Turkish Airlines deal was found by Cheapflights users on 9/7. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/277:15 pm -
1 stop30h 50m
Thu 10/86:25 pm -
1 stop31h 55m
Deal found 9/7![Turkish Airlines logo]()
$808
This United Airlines deal was found by Cheapflights users on 9/10. 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 9/276:50 pm -
1 stop19h 35m
Thu 10/811:55 am -
1 stop14h 04m
Deal found 9/10![United Airlines logo]()
$611
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/257:00 am -
2 stops30h 55m
Sun 11/17:30 am -
2 stops35h 10m
Deal found 9/10![United Airlines logo]()
$700
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 1/147:00 am -
2 stops24h 10m
Fri 1/227:30 am -
1 stop14h 30m
Deal found 9/10![United Airlines logo]()
$705
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Fri 10/2310:42 am -
2 stops27h 43m
Fri 10/307:30 am -
1 stop14h 30m
Deal found 9/8![United Airlines logo]()
$844
Last-minute flights from Seattle to BilbaoDiscover last-minute flight deals from Seattle to Bilbao. Data last updated September 11, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Bilbao. Data last updated September 11, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/9. 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 -
1 stop18h 15m
Tue 10/611:55 am -
1 stop14h 04m
Deal found 9/9![United Airlines logo]()
$592
This FlightHub deal was found by Cheapflights users on 9/10. 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.
Tue 9/226:50 pm -
1 stop19h 35m
Tue 10/68:55 pm -
2 stops30h 37m
Deal found 9/10![Multiple Airlines logo]()
$597
This FlightHub deal was found by Cheapflights users on 9/10. 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.
Tue 9/226:50 pm -
1 stop14h 05m
Tue 10/67:15 am -
1 stop18h 44m
Deal found 9/10![Lufthansa logo]()
$607
This Justfly.com deal was found by Cheapflights users on 9/9. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/276:50 pm -
1 stop19h 35m
Thu 10/86:50 am -
2 stops16h 32m
Deal found 9/9![Lufthansa logo]()
$610
This United Airlines deal was found by Cheapflights users on 9/10. 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 9/276:50 pm -
1 stop19h 35m
Thu 10/811:55 am -
1 stop14h 04m
Deal found 9/10![United Airlines logo]()
$611
This Expedia deal was found by Cheapflights users on 9/11. 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.
Mon 10/266:12 am -
2 stops22h 38m
Mon 11/29:35 pm -
2 stops31h 45m
Deal found 9/11![Iberia logo]()
$634
One-way flights from Seattle to BilbaoSearch for one-way flight options from Seattle to Bilbao. Find affordable one-way fares based on user searches. Data last updated September 11, 2026.
Search for one-way flight options from Seattle to Bilbao. Find affordable one-way fares based on user searches. Data last updated September 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/253:40 pm -
3 stops31h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$367
This Justfly.com deal was found by Cheapflights users on 9/7. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/161:50 pm -
1 stop24h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Lufthansa logo]()
$403
This United Airlines deal was found by Cheapflights users on 9/7. 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 12/167:45 am -
2 stops29h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![United Airlines logo]()
$473
This Kiwi.com deal was found by Cheapflights users on 9/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/167:10 am -
3 stops24h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$583
This Gotogate deal was found by Cheapflights users on 9/7. 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.
Fri 9/256:50 pm -
1 stop14h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Lufthansa logo]()
$689
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:15 pm -
3 stops51h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Multiple Airlines logo]()
$1,861
This Arangrant deal was found by Cheapflights users on 9/10. 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 Arangrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:50 pm -
1 stop14h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Lufthansa logo]()
$3,090
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 September 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $592 (United Airlines) |
One-way from | $367 (Kiwi.com) |
Popular in | July |
Cheapest in | January |
Average price | $974 |
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 7,457,451 searches. Data last updated September 11, 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
Cheapest round-trip
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Fri 9/25
3:40 pm-8:15 am
3 stops31h 35m
Bilbao
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$367
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Wed 12/16
1:50 pm-10:50 pm
1 stop24h 00m
Bilbao
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$403
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Wed 12/16
7:45 am-9:55 pm
2 stops29h 10m
Bilbao
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$473
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Tue 9/22
7:30 am-10:45 am
1 stop18h 15m
Bilbao
Tue 10/6
11:55 am-4:59 pm
1 stop14h 04m
$592
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Sun 9/27
6:50 pm-11:25 pm
1 stop19h 35m
Bilbao
Thu 10/8
11:55 am-4:59 pm
1 stop14h 04m
$611
Quickest round-trip
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Fri 9/25
6:50 pm-5:55 pm
1 stop14h 05m
Bilbao
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$689
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Tue 1/12
4:05 pm-11:30 am
1 stop34h 25m
Bilbao
Fri 1/22
6:50 am-11:50 am
1 stop14h 00m
$698
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Sun 10/25
7:00 am-9:55 pm
2 stops30h 55m
Bilbao
Sun 11/1
7:30 am-10:40 am
2 stops35h 10m
$700
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Thu 1/14
7:00 am-4:10 pm
2 stops24h 10m
Bilbao
Fri 1/22
7:30 am-1:00 pm
1 stop14h 30m
$705
SeattleBilbao
SEA Seattle/Tacoma Intl - BIO Bilbao
SEABIO
Seattle/Tacoma Intl
Mon 10/26
3:35 pm-11:20 am
3 stops35h 45m
Bilbao
Mon 11/2
5:20 pm-5:00 pm
3 stops32h 40m
$793
Showing 1-10 of 14 resultsSorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Seattle-Bilbao flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Bilbao flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.
SEA-BIO
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
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 11, 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.
Comfort
7.7
Crew
8.4
Overall
7.8
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Comfort
7.7
Crew
8.4
Overall
7.8
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Comfort
7.7
Crew
8.4
Overall
7.8
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Comfort
7.7
Crew
8.4
Overall
7.8
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Comfort
7.7
Crew
8.4
Overall
7.8
Entertainment
7.2
Food
7.3
Boarding
7.8
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
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.
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Explore flights to Bilbao departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 11, 2026.
Complete your trip
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Seattle and Bilbao flights
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Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on September 11, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 7,457,451 searches. Data last updated September 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$484 | Average$939 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$514 | Average$892 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$581 | Average$963 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$654 | Average$975 | FlexibilityNo cancel fee | On-timeN/A |