SEA - BIO

$240 Find Cheap Flights from Seattle to Bilbao

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 4/26. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Bilbao

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Bilbao, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Bilbao, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$455
Overall average: $897
Multiple Airlines
Fri 2/27Tue 3/3
SEA - BIO • 1 stop
Cheapest one-way
$240
United Airlines
Sun 4/26
SEA - BIO • 1 stop
Top airlines
Lufthansa
Cheapest • from $457 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
January
Cheapest • 52% price drop
September
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

Fri, Feb 27 - Tue, Mar 3
Multiple Airlines Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m
1 stop
Multiple Airlines Logo
6:45 am - 10:16 pm
BIO
-
SEA
24h 31m
2 stops
$455Multiple Airlines
Fri, Feb 27 - Tue, Mar 3
Lufthansa Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m
1 stop
Lufthansa Logo
6:45 am - 12:10 pm
BIO
-
SEA
14h 25m
1 stop
$457Lufthansa
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m
1 stop
United Airlines Logo
6:45 am - 12:10 pm
BIO
-
SEA
14h 25m
1 stop
$473United Airlines
Sun, Mar 1 - Mon, Mar 16
Delta Logo
4:05 pm - 11:30 am
SEA
-
BIO
34h 25m
2 stops
Delta Logo
6:50 am - 12:35 pm
BIO
-
SEA
13h 45m
1 stop
$480Delta
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m
1 stop
United Airlines Logo
6:45 am - 9:01 pm
BIO
-
SEA
23h 16m
3 stops
$483United Airlines
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m
1 stop
United Airlines Logo
11:35 am - 1:20 pm
BIO
-
SEA
34h 45m
1 stop
$485United Airlines
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
9:19 am - 11:20 pm
SEA
-
BIO
29h 01m
2 stops
United Airlines Logo
6:45 am - 9:01 pm
BIO
-
SEA
23h 16m
3 stops
$488United Airlines
Wed, Mar 11 - Wed, Mar 18
United Airlines Logo
7:00 am - 4:10 pm
SEA
-
BIO
25h 10m
2 stops
United Airlines Logo
7:25 am - 4:14 pm
BIO
-
SEA
40h 49m
2 stops
$490United Airlines
Sun, Mar 1 - Mon, Mar 16
American Airlines Logo
5:37 am - 8:30 am
SEA
-
BIO
17h 53m
2 stops
American Airlines Logo
9:15 am - 12:24 am
BIO
-
SEA
23h 09m
2 stops
$500American Airlines
Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m
2 stops
United Airlines Logo
6:45 am - 9:01 pm
BIO
-
SEA
23h 16m
3 stops
$516United Airlines
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.

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 January, where tickets cost $484 (return) on average. On the other hand, the most expensive months are June and March, where the average cost of round-trip tickets is $1,493 and $1,266 respectively.

Good to know

Low seasonDecember
Cheapest flight$240
Best time to beat the crowds but there is an average 9% increase in price.
Most popular time to fly with an average 6% 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 3 days, the lowest price for a flight from Seattle to Bilbao was $240 for a one-way ticket and $455 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 $1,110 and an overall rating of 7.9, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $1,075 and an overall rating of 7.7.

  • 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.
7.9
DeltaOverall score based on 8119 reviews
8.5Crew
7.2Food
7.8Entertainment
7.9Comfort
8.1Boarding
Airline reviews

It was last minute due to weather - considering - it was amazing! Good smiles, friendly staff and they were making sure we knew what was going on when and where.

10.0 ExcellentZebrina, Jan 2026
LGA - CAE
Read more Delta reviews

It was last minute due to weather - considering - it was amazing! Good smiles, friendly staff and they were making sure we knew what was going on when and where.

delta last minute gave me a boarding pass for a different flight with no confirmation that they were changing it

The flight was comfortable and uneventful, which is what I desire

The service from the flight attendants were of supreme quality. They greeted and treated everyone with a wide smile. This is totally absent nowadays. Kudos to them!!!!

Excellent flight and got us around tough weather. Only issue was seat TV did not work and crew tried to reboot.

Very large passenger too space from my own seat. Arm board couldn’t be lowered because of his size. It wads very uncomfortable trip, as the flight was full couldn’t move anywhere having back pain because of the position in which I was the entire flight.

was sitting in the jet bridge for 10 minutes in -20 degree weather waiting for my bag

Outdated equipment in disrepair, wifi inoperable. Broken seats, taped air vents, generally poor condition, the 717 showed its age and lack of upkeep.

My flight out of Baton Rouge to Atlanta was delayed by a half hour. This got us into Atlanta airport 30 minutes late. I ran through the airport to get to my connecting flight. As I approached the boarding gate, I saw the boarding door was still open and a passenger was being checked in. But when I got to the gate, the boarding agent told me they had already given away my seat and there were no empty seats on that flight. So I had to take a later flight. That has never happened to me before. Very frustrating.

Connection through Atlanta was difficult. Mechanical issue on plane caused a two hour delay. New gate was a mile away.

Flight was on time, staff are friendly and helpful onboard.

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

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.

Couldn’t get boarding pass in SLC even with help from a redcoat, so had to find a desk in AMS to get boarding pass. Technical problems so not sure why. Very inconvenient. The KLM app is not as user friendly as most apps. Also had to wait almost an hour on the tarmac for a fuel truck, which caused us to miss a connecting bus in LUX.

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.

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

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!

Klm start boarding while somw air issue in the plan

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

The food was terrible this time. Otherwise pleasant, quiet, on-time.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

Missed it by a couple minutes and couldn’t find an alternative flight so had to spend the night in DC and after much shuffling from 1 airline to another managed to get a United to Frankfurt.

There were only 2 toilets and one of them did not work in business class. We are not allowed to cross classes so had to wait in line to use the toilets!! The entertainment touch display was finicky and did not work all the time.

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

I tried both on line and by calling the Customer Service line to arrange for a special meal as i have food intolerances. I was under the impression from your service representative that I was successful. I was not. I cannot eat spicy foods and get very ill if i eat bell peppers. I could not eat either menu choice and no special meal was actually ordered. ( your representative tried to order it for a flight that did not have meal service!!! - found this out later). Your wonderful cabin crew managed to put together a fruit, salad, roll and cheese tray for me so I had something to eat. WHY WOULD YOU SERVE SPICY FOOD, WITH NO MILDER OPTION,ON AN INTERNATIONAL FLIGHT???

Crew was professional and great, flight was clean. However food was pathetic. I ordered a Hindu meal assuming no meat but they served chicken. Need to be very specific- Hindu meal should be categorize as Vegetarian - no meat or egg. Or it should be specific that we are serving meat.

Late flight Delays Poor service Poor staff Worst airline ever

Ground staff and cabin crew were excellent. Flight was perfectly on time. Zero issues.

Even after a delay, getting off the ground, thanks for keeping me safe, the airline made certain that my connecting flight was rebooked to get me to my final destination. It was actually rebooked twice, and my luggage still managed to meet me. The airline gave me a credit for food and beverage to be used at the airport vendors, regretfully, the credit did not transfer to my final boarding pass. Oh, well…

Trip was smooth, good drew, average meal, almost cold coffee. Excellent landing. Did not enjoy going down the stairs, walking to the gate, walking up the stairs, going a long walk to the exchange gate, and going down the stairs again to be bussed all the way where we originally landed to take our next flight! Over all an average experience. Thank you.

I booked extra leg room, due to seat neighbor i now consider extra shoulder and arm room as well. Seems like the seats shrink in width now The crew was very friendly and professional ( 100%). Food was good not great, breakfast was bad, a dry slice of bread would have been better. Facilities clean.

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

Information on your arrival and departure airports