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$326+ Cheap flights from Bilbao (BIO) to San Francisco (SFO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
BIO — SFO
Jul 23 — Jul 301
Wed 7/23
Wed 7/30
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 July 18, 2025.

Round-trip from

$418
(lol.travel)

One-way from

$326
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$881
From Bilbao to San Francisco
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One-way flight from Bilbao to San Francisco
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Highest demand for flights based on searches. 20% potential increase in price ($166 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 18, 2025.

This lol.travel deal was found by Cheapflights users on 7/16. 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.
Fri 11/216:40 pmBIO - SFO
1 stop29h 05mTAP AIR PORTUGAL
Sat 11/294:35 pmSFO - BIO
1 stop16h 20mTAP AIR PORTUGAL
Deal found 7/16$418
This American Airlines deal was found by Cheapflights users on 7/16. 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 11/209:15 amBIO - SFO
2 stops20h 27mAmerican Airlines
Thu 11/277:25 amSFO - BIO
2 stops20h 25mAmerican Airlines
Deal found 7/16$505
This lol.travel deal was found by Cheapflights users on 7/17. 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 8/286:45 amBIO - SFO
1 stop18h 25mFinnair
Sat 9/135:45 pmSFO - BIO
1 stop20h 30mFinnair
Deal found 7/17$509
This Iberia deal was found by Cheapflights users on 7/17. 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 10/166:45 amBIO - SFO
1 stop20h 25mIberia
Mon 10/206:51 amSFO - BIO
2 stops20h 54mIberia
Deal found 7/17$519
This Finnair deal was found by Cheapflights users on 7/17. 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 8/286:45 amBIO - SFO
2 stops23h 06mMultiple Airlines
Sat 9/135:45 pmSFO - BIO
1 stop20h 30mMultiple Airlines
Deal found 7/17$521
This Expedia deal was found by Cheapflights users on 7/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/229:15 amBIO - SFO
2 stops21h 42mBritish Airways
Sat 11/295:30 pmSFO - BIO
2 stops20h 45mBritish Airways
Deal found 7/16$559
This KLM deal was found by Cheapflights users on 7/15. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1412:00 pmBIO - SFO
1 stop32h 45mKLM
Sun 10/193:05 pmSFO - BIO
1 stop16h 35mKLM
Deal found 7/15$581
This lol.travel deal was found by Cheapflights users on 7/16. 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.
Fri 11/146:40 amBIO - SFO
1 stop15h 00mUnited Airlines
Sat 11/229:00 pmSFO - BIO
2 stops41h 05mUnited Airlines
Deal found 7/16$582
This Gotogate deal was found by Cheapflights users on 7/16. 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.
Thu 11/206:30 amBIO - SFO
1 stop15h 10mLufthansa
Thu 11/279:40 pmSFO - BIO
1 stop16h 25mLufthansa
Deal found 7/16$607

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 July 18, 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

Fri 11/21

6:40 pm-2:45 pm

1 stop29h 05m

San Francisco

Sat 11/29

4:35 pm-5:55 pm

1 stop16h 20m

$418

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 11/20

9:15 am-8:42 pm

2 stops20h 27m

San Francisco

Thu 11/27

7:25 am-12:50 pm

2 stops20h 25m

$505

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 8/28

6:45 am-4:10 pm

1 stop18h 25m

San Francisco

Sat 9/13

5:45 pm-11:15 pm

1 stop20h 30m

$509

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 8/28

6:45 am-4:10 pm

1 stop18h 25m

San Francisco

Sat 9/13

5:45 pm-11:15 pm

1 stop20h 30m

$516

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 10/16

6:45 am-6:10 pm

1 stop20h 25m

San Francisco

Mon 10/20

6:51 am-12:45 pm

2 stops20h 54m

$519

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Sat 11/22

9:15 am-9:57 pm

2 stops21h 42m

San Francisco

Sat 11/29

5:30 pm-11:15 pm

2 stops20h 45m

$559

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Fri 11/14

6:40 am-12:40 pm

1 stop15h 00m

San Francisco

Sat 11/22

9:00 pm-11:05 pm

2 stops41h 05m

$582

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 10/16

6:50 am-11:45 am

1 stop13h 55m

San Francisco

Mon 10/20

1:45 pm-4:30 pm

1 stop17h 45m

$585

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 11/20

6:30 am-12:40 pm

1 stop15h 10m

San Francisco

Thu 11/27

9:40 pm-11:05 pm

1 stop16h 25m

$607

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 11/17

7:25 am-1:35 pm

1 stop15h 10m

San Francisco

Mon 11/24

5:45 am-11:30 am

2 stops20h 45m

$621

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/17

Showing 1-10 of 15 results
1
2

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 July 11, 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 $358). 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 July 18, 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 July 18, 2025.
Read reviews from past customers who have flown Delta, KLM, and Finnair 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.
Delta
8.0
Very good
7,958 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,958 reviews
Delta
8.0
Very good
7,958 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,374 reviews
Delta
8.0
Very good
7,958 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,958 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,864 reviews
Delta
8.0
Very good
7,958 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Turkish Airlines
7.3
Good
3,906 reviews
Delta
8.0
Very good
7,958 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

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

    TAP AIR PORTUGAL, at $418, was found to be the cheapest airline from Bilbao to San Francisco.Alternate airlines to your destination round-trip include American Airlines and Finnair. TAP AIR PORTUGAL is 33% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Bilbao to San Francisco one-way?

    To fly one-way, consider booking your trip with Aer Lingus, which is currently one of the cheapest options available, starting at $417. TAP AIR PORTUGAL flights start at $581 while deals on Iberia start at $599 one-way.

  • 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 $358). 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
Mountain View
Santa Cruz
South San Francisco
Livermore
Turlock
Manteca
Antioch
Hollister
Watsonville
Newark
Milpitas
Sunnyvale
Campbell
Lathrop
Daly City
Foster City
Capitola
Santa Clara
Richmond

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Bilbao to San Francisco

Discover the top 3 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 July 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$397Average$1,011FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$538Average$734FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$596Average$926FlexibilityNo cancel feeOn-time76%

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