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$349+ 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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
BIO — SFO
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 29, 2025.

Round-trip from

$499
(Finnair)

One-way from

$349
(oojo)

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. 22% potential increase in price ($186 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 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 29, 2025.

This Finnair deal was found by Cheapflights users on 7/29. 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 9/116:45 amBIO - SFO
1 stop18h 25mFinnair
Wed 9/246:20 pmSFO - BIO
1 stop19h 55mFinnair
Deal found 7/29$499
This American Airlines deal was found by Cheapflights users on 7/28. 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 9/116:45 amBIO - SFO
1 stop18h 25mAmerican Airlines
Wed 9/246:10 amSFO - BIO
2 stops17h 20mAmerican Airlines
Deal found 7/28$503
This Iberia deal was found by Cheapflights users on 7/29. 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 9/116:45 amBIO - SFO
1 stop18h 25mIberia
Wed 9/246:20 pmSFO - BIO
1 stop29h 10mIberia
Deal found 7/29$531
This Finnair deal was found by Cheapflights users on 7/27. 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 9/116:45 amBIO - SFO
2 stops23h 33mMultiple Airlines
Wed 9/242:17 pmSFO - BIO
2 stops23h 58mMultiple Airlines
Deal found 7/27$532
This Gotogate deal was found by Cheapflights users on 7/29. 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.
Fri 10/176:45 amBIO - SFO
1 stop14h 55mLufthansa
Fri 10/3110:40 pmSFO - BIO
1 stop16h 25mLufthansa
Deal found 7/29$602
This lol.travel deal was found by Cheapflights users on 7/29. 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 9/1212:30 pmBIO - SFO
1 stop20h 01mUnited Airlines
Fri 9/199:15 pmSFO - BIO
1 stop28h 30mUnited Airlines
Deal found 7/29$603
This KLM deal was found by Cheapflights users on 7/29. 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.
Mon 11/1711:55 amBIO - SFO
1 stop32h 55mKLM
Fri 11/281:55 pmSFO - BIO
1 stop23h 50mKLM
Deal found 7/29$621
This Delta deal was found by Cheapflights users on 7/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/166:50 amBIO - SFO
1 stop13h 55mDelta
Mon 10/2012:03 pmSFO - BIO
2 stops19h 27mDelta
Deal found 7/27$625
This TAP AIR PORTUGAL deal was found by Cheapflights users on 7/28. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/247:45 pmBIO - SFO
1 stop27h 45mTAP AIR PORTUGAL
Tue 9/96:45 pmSFO - BIO
2 stops31h 45mTAP AIR PORTUGAL
Deal found 7/28$709

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 29, 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 9/11

6:45 am-4:10 pm

1 stop18h 25m

San Francisco

Wed 9/24

6:20 pm-11:15 pm

1 stop19h 55m

$499

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 9/11

6:45 am-4:10 pm

1 stop18h 25m

San Francisco

Wed 9/24

6:10 am-8:30 am

2 stops17h 20m

$503

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 9/11

6:45 am-4:10 pm

1 stop18h 25m

San Francisco

Wed 9/24

6:20 pm-8:30 am

1 stop29h 10m

$531

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 9/11

6:45 am-9:18 pm

2 stops23h 33m

San Francisco

Wed 9/24

2:17 pm-11:15 pm

2 stops23h 58m

$532

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Fri 10/17

6:45 am-12:40 pm

1 stop14h 55m

San Francisco

Fri 10/31

10:40 pm-11:05 pm

1 stop16h 25m

$602

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Fri 9/12

12:30 pm-11:31 pm

1 stop20h 01m

San Francisco

Fri 9/19

9:15 pm-10:45 am

1 stop28h 30m

$603

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Mon 11/17

11:55 am-11:50 am

1 stop32h 55m

San Francisco

Fri 11/28

1:55 pm-10:45 pm

1 stop23h 50m

$621

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Thu 10/16

6:50 am-11:45 am

1 stop13h 55m

San Francisco

Mon 10/20

12:03 pm-4:30 pm

2 stops19h 27m

$625

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Sun 8/24

7:45 pm-2:30 pm

1 stop27h 45m

San Francisco

Tue 9/9

6:45 pm-11:30 am

2 stops31h 45m

$709

BilbaoSan Francisco

BIO - SFO

BIOSFO

Bilbao

Tue 9/2

6:50 pm-2:35 pm

1 stop28h 45m

$349

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 14 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 25, 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 29, 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 29, 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
7,977 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

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
7,977 reviews
Delta
8.0
Very good
7,977 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

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
1,383 reviews
Delta
8.0
Very good
7,977 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

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
7,977 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

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
8,899 reviews
Delta
8.0
Very good
7,977 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

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
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,977 reviews

Overall

8.0

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

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?

    Finnair, at $499, was found to be the cheapest airline from Bilbao to San Francisco.Alternate airlines to your destination round-trip include American Airlines and Iberia. Finnair is 21% 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 TAP AIR PORTUGAL, which is currently one of the cheapest options available, starting at $349. Aer Lingus flights start at $420 while deals on Iberia start at $689 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
Sunnyvale
Newark
Milpitas
Campbell
Foster City
Capitola
Santa Clara
San Leandro
Burlingame
Redwood City

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 29, 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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