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$433+ Cheap flights from Bilbao (BIO) to San Francisco (SFO)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/13. Fares are subject to change and may not be available on all flights or dates of travel.
BIO — SFO
Oct 25 — Nov 11
Sat 10/25
Sat 11/1
1 adult, Economy
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Cheapflights Tip: The best prices from Bilbao to San Francisco are usually found in January or February, booked 61 days in advance, depart on a Wednesday or Tuesday and return on a Sunday

Cheap flight deals from Bilbao to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Bilbao (BIO) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$433
(lol.travel)

Popular in

July

Cheapest in

January

Average price

$598
Provider with most accurate pricing for Bilbao-San Francisco flight deals.
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Provider most trusted by Cheapflights users for Bilbao-San Francisco flights.
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From Bilbao to San Francisco
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Highest demand for flights based on searches. 22% potential increase in price ($185 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Bilbao to San Francisco

Cheapest flights from Bilbao to San Francisco
Explore the most affordable flight options available from Bilbao to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 25, 2025.

This lol.travel deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1312:10 pmBIO - SFO
1 stop36h 55mTAP AIR PORTUGAL
Sat 11/294:35 pmSFO - BIO
1 stop16h 20mTAP AIR PORTUGAL
Deal found 9/25$433
This Iberia deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/139:15 amBIO - SFO
2 stops20h 45mIberia
Sat 11/297:00 amSFO - BIO
2 stops16h 30mIberia
Deal found 9/25$561
This American Airlines deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/239:15 amBIO - SFO
2 stops20h 15mAmerican Airlines
Wed 11/56:30 amSFO - BIO
2 stops21h 30mAmerican Airlines
Deal found 9/24$570
This Finnair deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:45 amBIO - SFO
2 stops26h 14mMultiple Airlines
Thu 11/207:20 amSFO - BIO
2 stops30h 55mMultiple Airlines
Deal found 9/24$577
This Finnair deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/36:45 amBIO - SFO
2 stops22h 49mMultiple Airlines
Mon 11/1710:24 amSFO - BIO
2 stops27h 51mMultiple Airlines
Deal found 9/24$579
This Iberia deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/216:45 amBIO - SFO
2 stops23h 00mIberia
Sat 12/67:00 amSFO - BIO
2 stops16h 30mIberia
Deal found 9/25$580
This American Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/139:15 amBIO - SFO
2 stops20h 19mAmerican Airlines
Sat 11/297:00 amSFO - BIO
2 stops20h 50mAmerican Airlines
Deal found 9/25$585
This Finnair deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:45 amBIO - SFO
2 stops22h 42mMultiple Airlines
Wed 11/58:00 amSFO - BIO
2 stops30h 15mMultiple Airlines
Deal found 9/24$593
This Finnair deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:45 amBIO - SFO
2 stops22h 47mMultiple Airlines
Sat 11/2910:16 amSFO - BIO
2 stops27h 59mMultiple Airlines
Deal found 9/25$594
This lol.travel deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/166:45 amBIO - SFO
1 stop22h 25mUnited Airlines
Tue 11/257:25 amSFO - BIO
2 stops30h 40mUnited Airlines
Deal found 9/25$601
This Gotogate deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/166:45 amBIO - SFO
1 stop14h 55mLufthansa
Tue 11/259:40 pmSFO - BIO
1 stop16h 25mLufthansa
Deal found 9/25$602

Cheapflights Fare Finder

 
Customize your flight search to find flights from Bilbao to San Francisco that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 25, 2025.
Use the filters below to find and compare flights from Bilbao to San Francisco that are best for you.

Fly from

Bilbao

Fly to

San Francisco

Route

Depart

Return

Price

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 1/15

6:45 am-7:01 pm

2 stops21h 16m

San Francisco

Thu 1/22

10:40 am-11:15 pm

2 stops27h 35m

$496

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 1/12

12:50 pm-8:10 pm

1 stop16h 20m

San Francisco

Sun 1/25

10:35 pm-10:50 am

2 stops27h 15m

$563

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 1/12

12:50 pm-8:10 pm

1 stop16h 20m

San Francisco

Thu 1/22

5:00 am-11:05 pm

2 stops33h 05m

$563

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 1/12

12:50 pm-8:10 pm

1 stop16h 20m

San Francisco

Tue 1/20

8:45 pm-11:05 pm

1 stop17h 20m

$563

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 1/12

12:50 pm-8:10 pm

1 stop16h 20m

San Francisco

Mon 1/19

2:40 pm-4:40 pm

1 stop17h 00m

$564

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 2/16

6:50 am-7:28 pm

2 stops21h 38m

San Francisco

Mon 2/23

8:55 am-5:20 pm

2 stops23h 25m

$567

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 1/12

6:45 am-11:43 am

2 stops37h 58m

San Francisco

Wed 1/21

7:00 am-10:50 am

2 stops18h 50m

$569

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 2/16

7:25 am-2:50 pm

1 stop16h 25m

San Francisco

Thu 2/26

7:25 am-6:05 pm

2 stops25h 40m

$576

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 11/13

6:45 am-11:59 pm

2 stops26h 14m

San Francisco

Thu 11/20

7:20 am-11:15 pm

2 stops30h 55m

$577

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Tue 2/17

6:50 am-5:48 pm

2 stops19h 58m

San Francisco

Mon 2/23

10:10 am-11:30 am

2 stops16h 20m

$579

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/24

Showing 1-10 of 18 results
1
2

Compare providers for flights from Bilbao to San Francisco

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Bilbao to San Francisco in September.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Bilbao-San Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Bilbao-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Bilbao-San Francisco flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Bilbao-San Francisco flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Bilbao-San Francisco flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Bilbao to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Bilbao with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

How far ahead should I book a flight from Bilbao to San Francisco?

Use this chart to determine the optimal time to book a round-trip flight from Bilbao to San Francisco. Price data was last updated on September 19, 2025.

The price you pay for your flight from Bilbao to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 59 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Bilbao to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Bilbao to San Francisco (average of $276). Flying from Bilbao to San Francisco in June is currently the most expensive (average of $357). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BIO to SFO?

Find hourly flight availability from Bilbao to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 25, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 14% on flights from Bilbao to San Francisco by exploring options for tickets in the afternoon.

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated September 25, 2025.
Read reviews from past customers who have flown KLM and United Airlines from Bilbao to San Francisco. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,390 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Comfort

7.7

Overall

7.8

Reviews

1 / 20
10.0
Excellent

Bobby,Sep 2025

EDI - ATL

Food was above average but could be better, The flight was operated by Delta and was excellent
KLM
7.8
Good
1,390 reviews
KLM
7.8
Good
1,390 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Comfort

7.7

Overall

7.8

Reviews

1 / 20
10.0
Excellent

Bobby,Sep 2025

EDI - ATL

Food was above average but could be better, The flight was operated by Delta and was excellent
United Airlines
7.4
Good
8,926 reviews
KLM
7.8
Good
1,390 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.1

Food

7.3

Comfort

7.7

Overall

7.8

Reviews

1 / 20
10.0
Excellent

Bobby,Sep 2025

EDI - ATL

Food was above average but could be better, The flight was operated by Delta and was excellent

Related info for your journey

Find useful and relevant information for your journey from Bilbao to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Bilbao to San Francisco?

    A quick flight from Bilbao to San Francisco can take about 16h 20m. United Airlines provides one of the quickest options available for as low as $563. Airlines will cover a distance of 5678 mi.

  • What are the cheapest airlines flying from Bilbao to San Francisco round-trip?

    KLM, at $397, was found to be the cheapest airline from Bilbao to San Francisco. An alternate airline flying to your destination would be United Airlines. KLM is 36% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Bilbao to San Francisco that include hotel bookings?

    Yes. In addition to deals on Bilbao to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Bilbao to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Bilbao to San Francisco.

  • Can I find deals for business class flights from Bilbao to San Francisco?

    Yes. Cheapflights offers flight deals from Bilbao to San Francisco by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, January is the cheapest month in which you can book a flight from Bilbao to San Francisco (average of $276). Flying from Bilbao to San Francisco in June is currently the most expensive (average of $357). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Santa Cruz
Livermore
South San Francisco
Turlock
Antioch
Watsonville
Santa Clara
Manteca
Sunnyvale
Hollister
Vacaville
Foster City
Union City
Vallejo
Fairfield
Burlingame
Redwood City
San Mateo
San Leandro

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 2 airlines flying from Bilbao to San Francisco

Discover the top 2 airlines that operate flights from Bilbao to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$397Average$1,011FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$538Average$734FlexibilityNo cancel feeOn-time69%

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