SFO - BIO

$420 Find Cheap Flights from San Francisco 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 San Francisco to Bilbao departing on 2/1. 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.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Bilbao.
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Everything you should know

Cheapest round-trip
$464
Overall average: $736
Scandinavian Airlines
Sun 2/1Fri 2/6
SFO - BIO • 1 stop
Cheapest one-way
Multiple Airlines
Tue 12/16
SFO - BIO • multi-stop
Top airlines
Delta
Cheapest • from $578 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 18% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 28% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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

Sun, Feb 1 - Fri, Feb 6
Scandinavian Airlines Logo
4:40 pm - 6:40 pm
SFO
-
BIO
17h 00m1 stop
Scandinavian Airlines Logo
7:30 pm - 2:35 pm
BIO
-
SFO
28h 05m1 stop
$464Scandinavian Airlines
Thu, Jan 29 - Fri, Feb 13
Scandinavian Airlines Logo
3:10 pm - 6:40 pm
SFO
-
BIO
18h 30m1 stop
Scandinavian Airlines Logo
7:30 pm - 2:35 pm
BIO
-
SFO
28h 05m1 stop
$486Scandinavian Airlines
Sat, Mar 7 - Sun, Mar 15
TAP AIR PORTUGAL Logo
4:35 pm - 5:55 pm
SFO
-
BIO
16h 20m1 stop
TAP AIR PORTUGAL Logo
6:40 pm - 3:35 pm
BIO
-
SFO
28h 55m1 stop
$535TAP AIR PORTUGAL
Sun, Jan 25 - Mon, Feb 9
Lufthansa Logo
1:30 pm - 6:05 pm
SFO
-
BIO
19h 35m1 stop
Lufthansa Logo
6:50 pm - 2:50 pm
BIO
-
SFO
29h 00m1 stop
$539Lufthansa
Sun, Jan 25 - Mon, Feb 9
United Airlines Logo
7:00 am - 6:05 pm
SFO
-
BIO
26h 05m2 stops
United Airlines Logo
12:50 pm - 12:40 pm
BIO
-
SFO
32h 50m1 stop
$549United Airlines
Wed, Mar 18 - Sun, Mar 22
Lufthansa Logo
2:35 pm - 6:05 pm
SFO
-
BIO
19h 30m1 stop
Lufthansa Logo
7:25 am - 8:35 pm
BIO
-
SFO
21h 10m1 stop
$552Lufthansa
Sun, Jan 25 - Mon, Feb 9
Iberia Logo
6:00 am - 8:30 am
SFO
-
BIO
17h 30m2 stops
Iberia Logo
9:35 pm - 11:01 am
BIO
-
SFO
22h 26m2 stops
$562Iberia
Thu, Jan 29 - Thu, Feb 5
Multiple Airlines Logo
8:25 am - 12:50 pm
SFO
-
BIO
19h 25m2 stops
Multiple Airlines Logo
7:40 am - 7:35 pm
BIO
-
SFO
20h 55m1 stop
$564Multiple Airlines
Sun, Feb 1 - Fri, Feb 6
Scandinavian Airlines Logo
7:00 am - 6:40 pm
SFO
-
BIO
26h 40m2 stops
Scandinavian Airlines Logo
7:30 pm - 2:35 pm
BIO
-
SFO
28h 05m1 stop
$566Scandinavian Airlines
Tue, Apr 7 - Wed, Apr 29
TAP AIR PORTUGAL Logo
4:35 pm - 11:30 am
SFO
-
BIO
33h 55m1 stop
TAP AIR PORTUGAL Logo
12:25 pm - 4:35 pm
BIO
-
SFO
37h 10m1 stop
$572TAP AIR PORTUGAL
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.

What’s the cheapest day of the week to fly from San Francisco to Bilbao?

The average price of all round-trip flights from San Francisco to Bilbao clicked on KAYAK for each day over the last 12 months.

When flying from San Francisco to Bilbao, you should consider leaving on a Sunday and avoid Fridays if you are looking for the best rates. For your return to San Francisco, you’ll find the best rates on Wednesdays and the most expensive ones on Saturdays.

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 $559 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $1,082 and $965 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 3 weeks before departure, which saves you about 18% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$464
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly with an average 14% 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 3 days, the lowest price for a flight from San Francisco to Bilbao was $464 for a round-trip ticket.

  • 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?

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

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

    The two airlines most popular with KAYAK users for flights from San Francisco to Bilbao are Delta and KLM. With an average price for the route of $894 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 $674 and an overall rating of 7.7.

  • 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 5 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.
7.9
DeltaOverall score based on 8010 reviews
8.5Crew
7.9Entertainment
8.1Boarding
7.3Food
7.9Comfort
Airline reviews

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.

8.0 ExcellentDeborah, Nov 2025
LAX - RDU
Read more Delta reviews

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.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

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.

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

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

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.

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

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

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.

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

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.

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

This was an older airplane. The cabin was constantly warm to hot throughout the 10 hour flight and there were no vents to personalize air flow. Also since it was an older plane, the material and comfort of the chairs were very uncomfortable. I left my flight with major soreness on my tailbone.

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

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

We were in business class. the angled seats in that class do not have a real window view & the placement of the controls are bad. But we knew that. But the food options were mediocre. The taste was fine, but the size was for a child. It’s just really feels like United is skimping on everything. Even when we were in the Polaris lounge they did not have diet sodas. They said they were out no Coke zero no Diet Coke, etc. I do not think the portion of nuts they serve on the plane could get any smaller. Really a minimal service and offer for what you’re paying for in business.

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

From the first moment you interact with United Airlines, you can expect nothing less but extreme frustration. The baggage handler at the bag drop seems completely unbothered by the presence of customers waiting in line. No help was extended to load the baggage whatsoever. And if any of your bags is overweight by 0.01 pound they will make you re-distribute everything in your suitcase just to play power trip. When it was time to board no help was extended to customers to locate their seats. Moreover. It was a chaotic mess at the gate when it was unclear who should board first and everyone just bunched up, trying to get on the plane. I am sure the crew was doing their best to perform their jobs while being paid their wages however it shouldn’t be that hard to smile once or twice when you’re in the business if serving customers. It is a shame for the United States of America to have a flagship carrier of such low caliber. Our flight was also delayed by about an hour and a half due to further delays prior to our inbound flight. Being someone who has travelled for both business and leisure in Asia, Europe, and South America I have never experienced such poor quality of service.

the seats were bad and uncomfortable and the food was not tasty.

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

It was budget airline Veuling, even though we booked Iberia.

The staff was very nice and helpful. Some of the best crew I have met.

Bad experience. The seat room are very tight. The food is not good and the breakfast has no hot drink.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

Great : The crew was awesome ♥️ To improve : - The rice in the "Rice with chicken" was rather s kind of rice pudding, not good at all - No power outlet to charge your phone. 😒

It was a good flight overall. Nothing to add. Keep it up!

Excellent. Thanks to United Star Alliance, since economy was overbooked, I’m grateful to have been upgraded to Business Class.

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.

The food could be better, more snacks. And have some plugs to chargue the phone.

Everything was really great just The aircraft was too old and sounded it will break during takeoff

Extremely pleased with the crew. Best flight attendants ever! Very friendly, genuinely caring and attentive.

Best flight attendants ever! Very customer and service oriented, courteous, professional and helpful.

Cheapest airlines I have ever been on. I got downgraded and never got on united. I got rerouted through Vancouver onto jetwesf

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.

Very small and uncomfortable seats, Hard to hear entertainment system sound. Horrible food. Staff doesn't care much about the passengers. 2nd time they didn't give me my vegetarian meal. They asked me regular food with meat. The airline and staff was from United airlines.

Checkin took along timen only.few angents available at.checkin desk. Customer support over phone no existence

At baggage claim, I was given the wrong printed ticket. The ticket belonged to another passenger for a different flight — to Zurich instead of Frankfurt (layover). I was even allowed to pass security, and when I asked the Lufthansa employee if I was on the correct flight, and why it was changed. The employee said everything was correct and I should board. When I got on the plane, there was someone in my seat, and the crew on the plane finally realized that I was on the wrong plane. When I got off the plane, nobody was willing to help, and the security refused to provide my original printed ticket. That was until I showed them that I took a photo of the ticket; once they realized I had photographic evidence, they were suddenly ready to help me. The Lufthansa employee began communicating with other airlines and found a flight that would take me to my destination via Polish Airlines. I was required to once again go through security, re-check my bag, and once again pay for my checked bag and weight overage fees. This experience was incredibly stressful and very frustrating, as you can imagine. A Lufthansa employee told me I would be eligible for a refund. Please tell me what steps I need to take in order to make that happen. Thank you!

Everything you need to know for your flight from San Francisco to Bilbao

Information on your arrival and departure airports