SEA - BIO

$455 Find Cheap Flights from Seattle to Bilbao

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Bilbao departing on 1/30. 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
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Everything you should know

Cheapest round-trip
$455
Overall average: $533
Lufthansa
Fri 1/30Sun 2/8
SEA - BIO • 1 stop
Cheapest one-way
$580
Aer Lingus
Sun 4/26
SEA - BIO • 1 stop
When to travel
January
Cheapest • 46% 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, Jan 30 - Sun, Feb 8
Lufthansa Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m1 stop
Lufthansa Logo
7:25 am - 7:16 pm
BIO
-
SEA
20h 51m2 stops
$455Lufthansa
Thu, Jan 29 - Sun, Feb 8
Lufthansa Logo
2:10 pm - 9:55 pm
SEA
-
BIO
22h 45m2 stops
Lufthansa Logo
7:25 am - 7:16 pm
BIO
-
SEA
20h 51m2 stops
$459Lufthansa
Fri, Jan 30 - Sun, Feb 8
Lufthansa Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m1 stop
Lufthansa Logo
7:25 am - 7:16 pm
BIO
-
SEA
20h 51m2 stops
$464Lufthansa
Thu, Jan 29 - Sun, Feb 8
Lufthansa Logo
2:00 pm - 4:40 pm
SEA
-
BIO
17h 40m1 stop
Lufthansa Logo
7:25 am - 1:20 pm
BIO
-
SEA
14h 55m1 stop
$466Lufthansa
Fri, Jan 30 - Sun, Feb 8
Lufthansa Logo
7:00 am - 12:00 pm
SEA
-
BIO
20h 00m2 stops
Lufthansa Logo
7:25 am - 7:16 pm
BIO
-
SEA
20h 51m2 stops
$470Lufthansa
Mon, Jan 19 - Mon, Jan 26
United Airlines Logo
7:00 am - 10:50 am
SEA
-
BIO
18h 50m2 stops
United Airlines Logo
6:45 am - 12:10 pm
BIO
-
SEA
14h 25m1 stop
$476United Airlines
Thu, Jan 29 - Sun, Feb 8
Multiple Airlines Logo
8:10 am - 9:55 pm
SEA
-
BIO
28h 45m2 stops
Multiple Airlines Logo
7:25 am - 10:06 pm
BIO
-
SEA
23h 41m2 stops
$480Multiple Airlines
Thu, Jan 29 - Sun, Feb 8
Multiple Airlines Logo
8:10 am - 9:55 pm
SEA
-
BIO
28h 45m2 stops
Multiple Airlines Logo
12:45 pm - 2:31 pm
BIO
-
SEA
34h 46m3 stops
$483Multiple Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
3:10 pm - 11:20 pm
SEA
-
BIO
23h 10m1 stop
United Airlines Logo
11:35 am - 1:20 pm
BIO
-
SEA
34h 45m1 stop
$484United Airlines
Thu, Jan 29 - Sun, Feb 8
Multiple Airlines Logo
8:10 am - 9:55 pm
SEA
-
BIO
28h 45m2 stops
Multiple Airlines Logo
12:45 pm - 9:31 am
BIO
-
SEA
29h 46m3 stops
$485Multiple 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 $533 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,493 and $1,161 respectively.

Good to know

Low seasonDecember
Cheapest flight$455
Best time to beat the crowds but there is an average 13% increase in price.
Most popular time to fly with an average 10% 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 $580 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 $995 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 8013 reviews
7.3Food
7.9Comfort
8.1Boarding
7.9Entertainment
8.5Crew
Airline reviews

The food is terrible. The staff is wonderful. Comfort is good.

10.0 ExcellentRonda, Dec 2025
JAX - JFK
Read more Delta reviews

The food is terrible. The staff is wonderful. Comfort is good.

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Getting to the flight was arduous and lengthy. The flight itself was good but the food option wasn’t a good selection. I need to do a Kosher option on my return. Flight crew were nice

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

Staff was exceptional! Everyone was kind, professional and friendly making the trip very pleasant. Thank you!

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

We had a lot of really rough weather but that was not Delta's fault. Pilot was amazing.

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

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

United have really come back. Airport and boarding process is clear and good, app and information also very good

They charged a fee for 1st bag checked. Others in same party were free.

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Flight and crew were great. United didn't inform crew of immigration process which was disappointing!

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.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

love the crews and my only problem was the delay at Frankfurt was very bad. I have travelled with Lufthansa for over 30 years now and this was cost me some planned business appointment

The flight delay made the connection a bit tight but that's outside the flight crew's control.

We just made it to our connecting flight. A long, long speed walk!

We didn't get the coffee with breakfast in the morning.. 30 mins lazer I asked flight attendant why don't we get coffee now at least.. after the breakfast..she said that captain announced possible turbulences fee minutes ago, which didn't ecplain why we didn't get it with the breakfast..breakfast was very poor btw..just little pastry which you can eat in 4 little bites. Turbulences fortunately didn't even happen.. but we didn't get that more than necessary coffee in the morning after the night flight with very poor sleep.. They just served breakfast 1 hour afzer we took off..at like 11 PM.. that doesn't make sense at all.. Also, flight attendants weren't very nice..they looked like they're not happy with their job.. :/

Lufthansa still has a good level of quality compared to US airlines, especially with respect to (1) food quality - actually tasty, (2) good French red wine - free, (3) good movie selection. Also my ticket price includes 1 free check-in luggage, while some other budget airlines sneak in an extra $150 for a checkin.

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

Information on your arrival and departure airports