SEA - BIO

$418 Find Cheap Flights from Seattle to Bilbao - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Bilbao departing on 1/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

Save 20% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$768
Typical prices: $788-$952
Lufthansa
Sun 9/27Fri 10/9
SEA - BIO • 1 stop
Cheapest one-way
$238
Multiple Airlines
Tue 1/12
SEA - BIO • 3 stops
Top airlines
Cheapest • from $777 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Seattle and Bilbao. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $846 (round-trip)
Shortest trip • 13h 08m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Bilbao!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to Bilbao (SEA-BIO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Bilbao that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Bilbao

Sun, Sep 27 - Fri, Oct 9
Lufthansa Logo
6:50 pm - 5:55 pm
SEA
-
BIO
14h 05m
1 stop
Lufthansa Logo
6:45 am - 12:20 pm
BIO
-
SEA
14h 35m
1 stop
$768Lufthansa
Tue, Sep 22 - Tue, Sep 29
Multiple Airlines Logo
6:50 pm - 5:55 pm
SEA
-
BIO
14h 05m
1 stop
Multiple Airlines Logo
6:50 am - 10:47 pm
BIO
-
SEA
24h 57m
2 stops
$775Multiple Airlines
Sun, Sep 27 - Thu, Oct 8
Lufthansa Logo
6:50 pm - 5:55 pm
SEA
-
BIO
14h 05m
1 stop
Lufthansa Logo
6:50 am - 6:32 pm
BIO
-
SEA
20h 42m
2 stops
$777Lufthansa
Sun, Oct 4 - Fri, Oct 16
Delta Logo
1:30 pm - 5:30 pm
SEA
-
BIO
19h 00m
1 stop
Delta Logo
6:45 am - 4:35 pm
BIO
-
SEA
18h 50m
1 stop
$790Delta
Mon, Oct 5 - Fri, Oct 16
Multiple Airlines Logo
6:40 pm - 10:00 pm
SEA
-
BIO
18h 20m
1 stop
Multiple Airlines Logo
6:45 am - 4:35 pm
BIO
-
SEA
18h 50m
1 stop
$790Multiple Airlines
Sun, Sep 27 - Fri, Oct 9
Delta Logo
2:30 pm - 5:30 pm
SEA
-
BIO
18h 00m
2 stops
Delta Logo
6:45 am - 4:35 pm
BIO
-
SEA
18h 50m
1 stop
$795Delta
Tue, Sep 22 - Tue, Sep 29
United Airlines Logo
5:20 pm - 11:25 pm
SEA
-
BIO
21h 05m
2 stops
United Airlines Logo
6:50 am - 10:05 am
BIO
-
SEA
36h 15m
2 stops
$796United Airlines
Mon, Dec 14 - Thu, Dec 31
United Airlines Logo
12:15 pm - 11:05 pm
SEA
-
BIO
25h 50m
2 stops
United Airlines Logo
6:45 am - 8:59 pm
BIO
-
SEA
23h 14m
2 stops
$806United Airlines
Thu, Sep 3 - Sat, Sep 12
KLM Logo
9:50 pm - 10:45 pm
SEA
-
BIO
15h 55m
2 stops
KLM Logo
12:00 pm - 8:10 pm
BIO
-
SEA
17h 10m
2 stops
$1,269KLM
Thu, Sep 3 - Sat, Sep 12
KLM Logo
9:50 pm - 10:45 pm
SEA
-
BIO
15h 55m
2 stops
KLM Logo
12:00 pm - 8:10 pm
BIO
-
SEA
17h 10m
2 stops
$1,269KLM
Booking Insights

KAYAK's insights & trends for Seattle to Bilbao flights

Get data-powered insights and trends into flights from Seattle to Bilbao to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Seattle to Bilbao?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Seattle to Bilbao departing in November.

Flight prices are below average for this route right now.

Flights to Bilbao from Seattle usually cost between $877 and $1,477 in November.
The lowest price found in the past 5 days was $700 on Multiple Airlines (Nov 8-Nov 18).

What is the cheapest month to fly from Seattle to Bilbao?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Bilbao, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Bilbao is February, where tickets cost $0 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is $1,064 and $1,057 respectively.

How far in advance should I book a flight from Seattle to Bilbao?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Bilbao, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Bilbao, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Good to know

Cheapest flight

$418
Most popular time to fly with an average 23% increase in price.
Flight from Seattle to Bilbao

When to book flights from Seattle to Bilbao

Are your dates flexible? Find out the best times to travel from Seattle to Bilbao based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Bilbao

  • What is the cheapest flight from Seattle to Bilbao?

    In the last 5 days, the lowest price for a flight from Seattle to Bilbao was $238 for a one-way ticket and $775 for a round-trip.

  • Do I need a passport to fly between Seattle and Bilbao?

    Yes, you’ll need a passport to travel to Bilbao from Seattle.

  • Which aircraft models fly most regularly from Seattle to Bilbao?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seattle to Bilbao?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Seattle and Bilbao, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Seattle to Bilbao, Delta or KLM?

    The two airlines most popular with KAYAK users for flights from Seattle to Bilbao are Delta and KLM. With an average price for the route of $1,044 and an overall rating of 7.8, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $1,064 and an overall rating of 7.8.

  • How does KAYAK find such low prices on flights from Seattle to Bilbao?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Bilbao.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Bilbao?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Bilbao from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Bilbao?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Bilbao with an airline and back to Seattle with another airline. Booking your flights between Seattle and BIO can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Bilbao?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Bilbao from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Seattle to Bilbao

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Bilbao. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Bilbao? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
KLMOverall score based on 1550 reviews
7.7Comfort
7.2Entertainment
8.4Crew
7.8Boarding
7.3Food
Airline reviews

I think I previously submitted my feedback about flight lead Katherine in a different field by mistake. Please see those comments. Comments for Hyd to AMS are it was good. The flight lead and service met expectations for satisfactory high quality service but the flight lead did not stand out as exceptional as did the leads on the other two flights so I don’t remember anything specific one way or the other besides the fact I was satisfied.

10.0 ExcellentEmily, Jul 2026
ORD - MSP
Read more KLM reviews

I think I previously submitted my feedback about flight lead Katherine in a different field by mistake. Please see those comments. Comments for Hyd to AMS are it was good. The flight lead and service met expectations for satisfactory high quality service but the flight lead did not stand out as exceptional as did the leads on the other two flights so I don’t remember anything specific one way or the other besides the fact I was satisfied.

Had to cancel and rebook, KLM connection was cancelled prior to departure, ended up flying to Munich on non-Delta carrier.

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

Transavia flight, was booked as KLM but i couldnt select seat or access boarding pass with KLM at all. Crammed seating and very no frills experience all around. First and last time.

Everything worked smoothly, never had a concern with the flight from start to finish.

My flight was delayed by 4 hours in 30 minute increments. The gate agents were amazing but the communication was not. We were told that there was a maintenance issue but they didn't know what it was. That didn't inspire confidence. Then they said they found it and it was fixed and the pilot just needed to sign off. Then the pilot needed to talk to the other pilot from the arriving flight and we'd be fine. Then we were waiting for the pilot to call back. Then the maintenance issue wasn't fixed. Then they decided we were getting a new plane (why didn't they decide this earlier??). Fine. But then they announced we were changing gates AND terminals. And we were boarding in 20 minutes. So we all had to run to the new terminal gate. We could have taken off at that time, but we then had to wait for all the people who rebooked on a different flight to book this flight again. That took 30+ minutes because there was only one gate agent. When everyone ditched this flight, I saw it as an opportunity to upgrade to comfort. Delta, the greedy jerks they are, charged me $121. After their delay, their fault, their issues, couldn't even discount an upgrade. They only handed out $12 meal vouchers for the delay. I can't even get a snack from starbucks for that.

Love me some Delta. One of the few airlines to recognize and support veterans. Easy boarding, flight was on time and arrived early and the flight attendants were excellent on this flight.

We sat on the runway for over an hour before departure. That was unwelcome.

The Boarding process was great. Particularly since my wife and I require assistance. The flight attendants were amazing. We travel frequently; they honestly were a cut above. 😀

Crew was nice, meal was good. Entertainment had to be rebooted 3 times and still did not work. Turns out there was residue on screen, it needed to be cleaned to prevent the touchscreen buttons from continuously activating. I had entertainment for the last 45 minutes of a 5 hour 45 minute flight. Really unacceptable for first class. Flight attendent indicated your cleaning solution creates this problem. Seems as if this is widely known, you should be using a different product or cleaning better. Really really disappointing which simply added to the wi fi on your planes with reliably never ever works.

Snacks and included beverages were appreciated. Boarding went smoothly. Plenty of overhead bin space. Seats get very uncomfortable after a couple of hours. After waiting 10 painful minutes for my walker, a very nice Delta guest agent pushed me in a wheelchair to the gate. It was finally delivered to me after another 15 minutes . Our checked bag was on the carousel long b4 I was able to retrieve it. Fortunately it was still there but somewhere along the way the straps we used to secure it were removed and and were not reattached. Wish I had made note of the agents name.

The cabin temperature was nice and cool. The wifi was not working.

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

First flight out and was 85 minutes delayed. Notification came out way too late

Flight be on time would be a good start. Then train your flight attendants to be attentive and friendly. This time they completely forgot my row for the measly snack! United, do better!

Our flight was delayed several Times due to mechanical issues. Although I understand this may happen at times, it was very inconvenient and we had to book a hotel for an overnight stay. We were traveling with my 3-yo grandson and waiting at the airport from noon until 6:30pm with no reassurance that our next rescheduled flight would depart, we had to decide what’s best for him. A day later, I found out that I may be able to demand compensation if my flight is delayed more than 4 hours. I will hav to read the fine print next time.

Very comfortable seating and the Flight staff were very attentive. The premium economy section that I was seated in was very clean, updated, and well appointed. I would highly recommend flying United Airlines as this experience was better than the Japan Airlines business class that I flew several months ago.

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

Had to cancel first flight because Airporter Bus took over 3 hrs to get to airport which resulted in an extra $378 dollar fare . Is there anyway I can be reimbursed for initial fare since it was not my fault? Sent from my iPhone EJ Ledet

Delayed by 2.5hrs any longer and they would’ve had to honour their own policy for breaking their own rules and regs. Not cool, especially when I have an infant child that needs to stay on a routine and they get schedules.

They had three choices for snacks - but you could only have one - and they ran out of the dark chocolate before they made it all the way down the aisle... Packed flight - limited service.

They opened my checked bag and even though my lock was tsa approved, they loose my lock and left my bag just like that. Incompetent people, very upset about it. I’ll try to avoid traveling with united

We fly to Ecuador frequently. Checking in is usually a hassle because most United agents take some time before they can verify that my passport doesn't require a visa to Ecuador. This time the process was even longer due to the cyber attack. But she was really nice to us. So glad we brought plenty of snacks to supplement the 3 flights from SEA to GYE.

No in flight entertainment, gate employees were very quick and impatient, plane was uncomfortable

The flight was cancelled, so why are you asking me how the flight was?

It was good although we could not land in Munich due to weather and we had to go to Stuttgart. Missed our second flight. They did get us on another flight but the seats where not the ones I paid for in the flight that we missed.

It would have been nice if my luggage had made it onto my connecting flight as well. Now I have to wait for my luggage to be delivered and that might take a while, which certainly put a damper on the entire experience.

Biggest gripes were that the seats were extra narrow as the 4-in-the-middle taper down. As with most flight, too little leg room hurts my aging hips. Also changing the flight time to 3 hours earlier meant that we had a terribly long lay-over in one of the world's most boring airports

In this flight was no good it was delay, change of door

German crew were very kind. Food was okay but can be better, especially bread was not good, Garbage collection was very poor.

Great! Great staff, great food, great flight :) Keep up the good work!!!

It was good. Nice entertainment selection to keep me busy for the timeframe I wasn't sleeping. Professional, courteous and attentive crew.

They lost my bags and I didn't get them for 4 days after. This also happened to about 30 other people on my flight from fra to MAA (I know bc we were all filing claims in line together from the same flight.)

Flight took off arrive Frankfurt fine ... and then the Pilot parked the plane for 20 minutes while waiting for a steps vehicle to arrive so we all could deplane. This caused us to miss our Naples flight by 6 minutes while running to the next gate.. We are aware of 3 others who also miss their flight. Lufthansa Support said "why miss your flight, your flight arrived on time?" We explained, they provided another flight many hrs later, no meal voucher because our "flight was ontime".

Everything you need to know for your flight from Seattle to Bilbao

Information on your arrival and departure airports