SEA - BIO

$450 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 11/22. 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

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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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, Nov 28 - Thu, Dec 11
Lufthansa Logo
3:10 pm - 11:20 pmSEA-BIO
23h 10m1 stop
Lufthansa Logo
6:45 am - 7:16 pmBIO-SEA
21h 31m2 stops
$461Lufthansa
Find Deal
Sun, Feb 1 - Mon, Feb 9
Scandinavian Airlines Logo
7:20 am - 6:40 pmSEA-BIO
26h 20m2 stops
Scandinavian Airlines Logo
7:30 pm - 10:05 pmBIO-SEA
35h 35m2 stops
$478Scandinavian Airlines
Find Deal
Thu, Dec 4 - Thu, Dec 11
Multiple Airlines Logo
3:40 pm - 11:20 pmSEA-BIO
46h 40m2 stops
Multiple Airlines Logo
6:45 am - 10:06 pmBIO-SEA
24h 21m2 stops
$485Multiple Airlines
Find Deal
Fri, Nov 28 - Thu, Dec 11
Lufthansa Logo
3:10 pm - 11:20 pmSEA-BIO
23h 10m1 stop
Lufthansa Logo
11:35 am - 1:20 pmBIO-SEA
34h 45m1 stop
$488Lufthansa
Find Deal
Fri, Nov 28 - Thu, Dec 11
Multiple Airlines Logo
3:10 pm - 11:20 pmSEA-BIO
23h 10m1 stop
Multiple Airlines Logo
6:45 am - 7:16 pmBIO-SEA
21h 31m2 stops
$493Multiple Airlines
Find Deal
Fri, Jan 30 - Wed, Feb 11
Delta Logo
9:55 pm - 5:20 pmSEA-BIO
34h 25m2 stops
Delta Logo
6:50 am - 11:40 amBIO-SEA
13h 50m1 stop
$524Delta
Find Deal
Fri, Jan 30 - Thu, Feb 12
Delta Logo
2:10 pm - 5:20 pmSEA-BIO
18h 10m1 stop
Delta Logo
7:25 am - 11:25 amBIO-SEA
13h 00m1 stop
$525Delta
Find Deal
Thu, Dec 4 - Thu, Dec 11
United Airlines Logo
3:45 pm - 6:05 pmSEA-BIO
17h 20m2 stops
United Airlines Logo
6:45 am - 10:16 pmBIO-SEA
24h 31m2 stops
$529United Airlines
Find Deal
Sat, Jan 31 - Tue, Feb 10
KLM Logo
2:00 pm - 5:20 pmSEA-BIO
18h 20m2 stops
KLM Logo
6:50 am - 4:19 pmBIO-SEA
18h 29m2 stops
$534KLM
Find Deal
Wed, Apr 1 - Wed, Apr 22
KLM Logo
2:05 pm - 10:45 pmSEA-BIO
23h 40m1 stop
KLM Logo
6:50 am - 3:50 pmBIO-SEA
18h 00m1 stop
$575KLM
Find Deal

Everything you should know

Top airlines
Lufthansa
Cheapest • from $461 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
October
Cheapest • 31% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$461
Typical prices: $846-$1,102
Lufthansa
Fri 11/28Thu 12/11
SEA - BIO • 1 stop
Cheapest one-way
$450
Typical prices: $618-$678
Air Canada
Sat 11/22
SEA - BIO • 2 stops
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We hope you love your trip to Bilbao!
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 October, where tickets cost $731 (return) on average. On the other hand, the most expensive months are June and January, where the average cost of round-trip tickets is $1,503 and $1,359 respectively.

Good to know

Low seasonJanuary
Cheapest flight$450
Best time to beat the crowds but there is an average 28% increase in price.
Most popular time to fly with an average 5% 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 $450 for a one-way ticket and $461 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 $1,080 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 7979 reviews
7.9Entertainment
7.3Food
8.5Crew
8.2Boarding
7.9Comfort
Airline reviews

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

6.0 GoodDavid, Oct 2025JFK - KEF
Read more Delta reviews

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Old plane and old configuration/seats but still comfortable for a morning flight

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

The boarding process needs to be refined. Sometimes the gate crew call out the boarding zone, and then flip to the monitor to show which zones are boarding. So unless everyone is gathered around to see the monitor there is usually confusion as wi which zones are boarding.

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.

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

Friendly and professional flight crew. Aside from departure delay after boarding, easy flight and smooth landing.

Great smooth flight. Had a seating change, but that was an improvement. Thanks United Airways Crew.

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

My husband and I recently had an unfortunate experience with Lufthansa. At the Philadelphia International airport, the ground staff refused to board us because we didn’t have a current visa stamped on our passports for Frankfurt. We completely understand that this was our mistake. we should have double-checked the visa requirements before our trip. However, the issue that upset us most was how the situation was handled by the staff. They told us they would mark it as “boarding denied due to visa issue”, but instead they recorded it as “no show”. Because of that incorrect entry, our return flight was automatically cancelled as well, which caused additional stress and expense. Mistakes can happen, but we expected more transparency and accuracy from a reputed airline like Lufthansa. It would have made a big difference if the staff had been more careful and considerate in documenting the situation correctly.

Flight was good but there are way to many announcements for credit cards etc.

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

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.

I think they overbooked Frankfurt to New York and bumped me off. This changed my return travel I arrived home about 4 hours late. Almost 24 total travel time Totally unacceptable Would not travel with United

We were moved twice on flights to the point we weren’t even on Lufthansa anymore. We had to fly united. Lost paid extra leg room twice. To top it all off we’re forced to pay $375 and $275, respectively for you luggage that was considered sports luggage. We were told it would be Lufthansa fares l, from the united desk, AND WE DIDN'T EVEN HAVE A LUFTHANSA FLIGHT! I’ll be calling once my trip is over on October 7th to all airlines and Kayak. This was ridiculous!

Everything went smoothly and the staff was very kind. I’m glad I purchased the extra leg room for my long flight; it was totally worth it. We were served 2 meals for a 9 hour flight which I was not expecting and they were very tasty. I appreciated them being vegetarian. Customs line in Munich was long; I had a choice to have a 1 hr 40 min layover or 2 hr 40 min layover; I took the longer layover which I was thankful for because my flight was delayed 30 minutes and there’s a good chance I would have missed my connecting flight. This was my very first international flight and I would fly Discover again without hesitation. Thank you for taking good care of me!

I liked everything BUT the temperature. It was freezing and now I am sick.

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

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