SFO - BIO

$367 Find Cheap Flights from San Francisco 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 San Francisco to Bilbao departing on 10/3. 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 San Francisco 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 San Francisco to Bilbao, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$685
Typical prices: $986-$739
TAP AIR PORTUGAL
Mon 8/17Tue 8/25
SFO - BIO • 1 stop
Cheapest one-way
$367
Typical prices: $460-$960
Iberia
Sat 10/3
SFO - BIO • 2 stops
Top airlines
Cheapest • from $685 (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 San Francisco and Bilbao. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $441 (round-trip)
Shortest trip • 15h 00m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 9% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 32% 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 San Francisco to Bilbao (SFO-BIO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco 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 San Francisco to Bilbao

Mon, Aug 17 - Tue, Aug 25
TAP AIR PORTUGAL Logo
4:30 pm - 6:00 pm
SFO
-
BIO
16h 30m
1 stop
TAP AIR PORTUGAL Logo
6:50 pm - 2:35 pm
BIO
-
SFO
28h 45m
1 stop
$685TAP AIR PORTUGAL
Tue, Sep 15 - Wed, Sep 30
Scandinavian Airlines Logo
4:45 pm - 6:45 pm
SFO
-
BIO
17h 00m
1 stop
Scandinavian Airlines Logo
7:35 pm - 2:40 pm
BIO
-
SFO
28h 05m
1 stop
$722Scandinavian Airlines
Tue, Aug 25 - Tue, Sep 15
TAP AIR PORTUGAL Logo
7:20 pm - 11:30 am
SFO
-
BIO
31h 10m
2 stops
TAP AIR PORTUGAL Logo
6:50 pm - 2:35 pm
BIO
-
SFO
28h 45m
1 stop
$724TAP AIR PORTUGAL
Sat, Sep 19 - Tue, Sep 29
TAP AIR PORTUGAL Logo
7:35 pm - 11:40 am
SFO
-
BIO
31h 05m
1 stop
TAP AIR PORTUGAL Logo
6:50 pm - 2:35 pm
BIO
-
SFO
28h 45m
1 stop
$745TAP AIR PORTUGAL
Wed, Sep 16 - Wed, Sep 30
TAP AIR PORTUGAL Logo
4:35 pm - 11:30 am
SFO
-
BIO
33h 55m
1 stop
TAP AIR PORTUGAL Logo
12:25 pm - 2:30 pm
BIO
-
SFO
35h 05m
1 stop
$746TAP AIR PORTUGAL
Wed, Nov 11 - Tue, Nov 24
Multiple Airlines Logo
7:14 am - 11:15 pm
SFO
-
BIO
31h 01m
2 stops
Multiple Airlines Logo
6:45 am - 12:43 am
BIO
-
SFO
26h 58m
2 stops
$750Multiple Airlines
Tue, Aug 25 - Tue, Sep 15
TAP AIR PORTUGAL Logo
7:20 pm - 11:30 am
SFO
-
BIO
31h 10m
1 stop
TAP AIR PORTUGAL Logo
6:50 pm - 2:35 pm
BIO
-
SFO
28h 45m
1 stop
$761TAP AIR PORTUGAL
Tue, Sep 15 - Fri, Oct 2
Scandinavian Airlines Logo
4:45 pm - 6:45 pm
SFO
-
BIO
17h 00m
1 stop
Scandinavian Airlines Logo
7:35 pm - 2:40 pm
BIO
-
SFO
28h 05m
1 stop
$762Scandinavian Airlines
Wed, Nov 11 - Tue, Nov 24
KLM Logo
9:00 am - 11:45 am
SFO
-
BIO
17h 45m
2 stops
KLM Logo
6:50 am - 11:45 am
BIO
-
SFO
13h 55m
1 stop
$771KLM
Wed, Nov 11 - Tue, Nov 24
Lufthansa Logo
9:40 pm - 11:05 pm
SFO
-
BIO
16h 25m
1 stop
Lufthansa Logo
6:45 am - 12:35 pm
BIO
-
SFO
14h 50m
1 stop
$772Lufthansa
Booking Insights

KAYAK's insights & trends for San Francisco to Bilbao flights

Get data-powered insights and trends into flights from San Francisco 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 San Francisco 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 San Francisco to Bilbao departing in August.

What is the cheapest month to fly from San Francisco to Bilbao?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco 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 San Francisco to Bilbao is October, where tickets cost $552 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is $1,162 and $995 respectively.

How far in advance should I book a flight from San Francisco 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 San Francisco 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 San Francisco to Bilbao, you should book around 2 weeks before departure, which saves you about 9% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$367
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly with an average 43% increase in price.
Flight from San Francisco to Bilbao

When to book flights from San Francisco to Bilbao

Are your dates flexible? Find out the best times to travel from San Francisco 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 San Francisco to Bilbao

  • What is the cheapest flight from San Francisco to Bilbao?

    In the last 5 days, the lowest price for a flight from San Francisco to Bilbao was $367 for a one-way ticket and $685 for a round-trip.

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

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

  • Which aircraft models fly most regularly from San Francisco to Bilbao?

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

  • Which airline alliances offer flights from San Francisco to Bilbao?

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

  • Which is the best airline for flights from San Francisco to Bilbao, KLM or United Airlines?

    The two airlines most popular with KAYAK users for flights from San Francisco to Bilbao are KLM and United Airlines. With an average price for the route of $675 and an overall rating of 7.8, KLM is the most popular choice. United Airlines is also a great choice for the route, with an average price of $924 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from San Francisco 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 San Francisco to Bilbao.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Bilbao from San Francisco 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 San Francisco 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 San Francisco with another airline. Booking your flights between San Francisco 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 San Francisco 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 San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from San Francisco to Bilbao

 
See real verified KAYAK customer reviews for airlines flying from San Francisco 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 San Francisco 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 1528 reviews
7.7Comfort
7.8Boarding
7.3Food
7.2Entertainment
8.4Crew
Airline reviews

As per usual when you Hit the UK it's a slow process through customs Not as efficient at Thailand for sure

10.0 ExcellentDiane, Apr 2026
AMS - HUY
Read more KLM reviews

As per usual when you Hit the UK it's a slow process through customs Not as efficient at Thailand for sure

There were no charge points for phones on the economy seats. The seats were comfortable overall. Food was okay.. flight was on time

The flight was delayed. The aircraft was unclean. Promised seat was not given due to change in Aircraft. Not one crew on ground was in a position to give any response. Amsterdam Airport is AVIODABLE Over crowded. Over Expensive. Poor Services.

It was really nice experience by flying this klm flight.I personally recommend everyone to please try this klm flight

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

Crew is not the cheerful type. very slow meal service (this is their style as have flown this many times)

I’m grateful for the KLM Air France shuttle bus service to Ottawa. However due to construction and other issues related to the chaotic Uber pickup system at YUL, it’s a challenge to find the Kelios bus service to Ottawa. The signs are not clear or even available. No staff to guide passengers. It’s a stressful experience.

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

Terrible last row seats many seats available but no offer to move to better seat

Delay on my previous leg, had to run to catch my flight. But that happens. Overall ok.

It was perfect! United Airlines staff was extremely caring, super friendly and professional

United has maintenance issues and can then never recover. No operations ability and simple issues always turn into multiple hours long cascading delays. Worst airline on earth.

I paid for a confirmed upgraded aisle seat and was moved to a center seat in the back of the plane at the last minute.

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

Lost of requested seat assignments. Lost my husband's meal choice

My service dog and I were asked to deplane just before they closed the door - clearly very last minute they couldn’t find the documentation that I have filled out many many times before that is for flying service animals. I purposely purchase 3seats (a whole row) since he is large and not all passengers want to sit next to a dog on a cross country flight. The plane departed with my husband on it!!! They made me fill out a hard copy of the same form and had to reschedule me on a later flight where they could find 3 seats together!! I’ve done this so many times before - clearly the error was on their part in a technology glitch - but really people - do better!! Very traumatic - and my husband had to wait for us when he landed ….so bad. Poor pup was confused and tired.

My flight time was changed without any notification to me which ruined my time sensitive plans so I ended up completely changing my travel plans and no reimbursement.

No screens or meal options. Freezing cold. Dirty seats. Left late.

I liked that my son and I were reseated next to each other (we had different bookings). I liked that it was a directg flight and mostly on time. I liked that you provided pillows and blankets. Flight attendants were generally courteous. The messaging through wifi did not work well. The food was not good. Seats are very narrow and I felt slightly claustraphobic in the window seat.

Flight attendants were fine, seats a bit hard but I use a cushion for extra support. The only issue was it was a bit too cool and I needed to ask for and received and extra blanket. I survived!!!

Very few things and/or people are excellent. It was very good.

Food choices limited & not enticing Seats quite uncomfortable & difficult to control

Definitely get premium economy on a flight this long if you can. Your legs and while body will thank you.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Service and food were excellent. Incredibly friendly and competent staff. Flight was delayed over and hour and I had to run between terminals to get my connecting flight.

Late flight Delays Poor service Poor staff Worst airline ever

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 San Francisco to Bilbao

Information on your arrival and departure airports