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$413+ Cheap flights from San Francisco (SFO) to Bilbao (BIO)

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 1/18. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — BIO
ene. 3 — ene. 101
sáb. 1/3
sáb. 1/10
1 adult, Economy
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Cheapflights Tip: The best prices from San Francisco to Bilbao are usually found in October or December, booked 87 days in advance, depart on a Sunday or Tuesday and return on a Wednesday

Cheap flight deals from San Francisco to Bilbao

Cheapest flights from San Francisco to Bilbao
Explore the most affordable flight options available from San Francisco to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on diciembre 4, 2025.

This Delta deal was found by Cheapflights users on 12/3. 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.
mié. 12/176:00 amSFO - BIO
2 stops25h 30mDelta
jue. 1/86:50 amBIO - SFO
2 stops25h 38mDelta
Deal found 12/3$2,008
This Delta deal was found by Cheapflights users on 12/3. 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.
mié. 12/176:00 amSFO - BIO
2 stops25h 30mDelta
mié. 1/76:50 amBIO - SFO
2 stops25h 14mDelta
Deal found 12/3$2,083
This Delta deal was found by Cheapflights users on 12/3. 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.
mié. 12/176:00 amSFO - BIO
2 stops25h 30mDelta
mar. 1/612:15 pmBIO - SFO
2 stops43h 40mDelta
Deal found 12/3$2,101
This Delta deal was found by Cheapflights users on 12/3. 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.
sáb. 12/208:17 pmSFO - BIO
2 stops35h 13mDelta
jue. 1/86:50 amBIO - SFO
2 stops25h 14mDelta
Deal found 12/3$2,134
This Delta deal was found by Cheapflights users on 12/3. 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.
jue. 12/185:45 amSFO - BIO
2 stops20h 45mDelta
jue. 1/86:50 amBIO - SFO
2 stops25h 14mDelta
Deal found 12/3$2,189
This Delta deal was found by Cheapflights users on 12/3. 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.
sáb. 12/208:17 pmSFO - BIO
2 stops35h 13mDelta
mié. 1/76:50 amBIO - SFO
2 stops25h 14mDelta
Deal found 12/3$2,209
This Delta deal was found by Cheapflights users on 12/3. 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.
sáb. 12/208:17 pmSFO - BIO
2 stops35h 13mDelta
mar. 1/612:15 pmBIO - SFO
2 stops43h 49mDelta
Deal found 12/3$2,227
This Delta deal was found by Cheapflights users on 12/3. 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.
jue. 12/185:45 amSFO - BIO
2 stops20h 45mDelta
mié. 1/76:50 amBIO - SFO
2 stops25h 14mDelta
Deal found 12/3$2,264
This KAYAK deal was found by Cheapflights users on 12/3. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/215:25 pmSFO - BIO
2 stops19h 30mLufthansa
jue. 1/811:35 amBIO - SFO
2 stops34h 45mLufthansa
Deal found 12/3$2,271

Find flight deals from San Francisco to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Bilbao (BIO). 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 diciembre 4, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$413
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$642
Provider with most accurate pricing for San Francisco-Bilbao flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Bilbao flights.
Search Deals
From San Francisco to Bilbao
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($191 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to Bilbao 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 diciembre 4, 2025.
Use the filters below to find and compare flights from San Francisco to Bilbao that are best for you.

Fly from

San Francisco

Fly to

Bilbao

Route

Depart

Return

Price

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

lun. 3/23

10:40 pm-11:05 pm

1 stop16h 25m

Bilbao

mié. 4/1

6:45 am-12:40 pm

1 stop14h 55m

$445

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

dom. 1/18

1:30 pm-6:05 pm

1 stop19h 35m

Bilbao

mar. 1/27

11:35 am-7:35 pm

1 stop17h 00m

$452

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

lun. 1/12

11:56 pm-12:50 pm

2 stops27h 54m

Bilbao

mar. 1/27

11:35 am-7:35 pm

1 stop17h 00m

$460

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

lun. 1/12

10:35 am-5:20 pm

2 stops21h 45m

Bilbao

mar. 1/27

7:25 am-11:04 pm

2 stops24h 39m

$462

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

lun. 3/23

4:35 pm-11:05 pm

2 stops22h 30m

Bilbao

mié. 4/1

7:15 am-10:43 pm

2 stops24h 28m

$470

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

mié. 1/21

8:25 am-4:10 pm

2 stops22h 45m

Bilbao

dom. 2/1

6:45 am-12:40 pm

1 stop14h 55m

$472

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

sáb. 1/17

12:43 am-6:05 pm

3 stops32h 22m

Bilbao

mar. 1/27

11:35 am-11:00 pm

2 stops20h 25m

$479

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

mié. 2/4

1:30 pm-6:05 pm

1 stop19h 35m

Bilbao

dom. 2/8

7:25 am-2:50 pm

1 stop16h 25m

$490

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

jue. 2/26

1:25 pm-6:05 pm

2 stops19h 40m

Bilbao

mié. 3/4

7:25 am-2:50 pm

1 stop16h 25m

$495

San FranciscoBilbao

SFO - BIO

SFOBIO

San Francisco

vie. 2/20

11:20 pm-10:50 am

2 stops26h 30m

Bilbao

mié. 3/4

7:25 am-2:50 pm

1 stop16h 25m

$495

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/3

Showing 1-10 of 16 results
1
2

Compare providers for flights from San Francisco to Bilbao

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 San Francisco to Bilbao in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star
SmartFaresPrice Accuracy1 starTrust Score*1 star

*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 San Francisco-Bilbao flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Francisco-Bilbao flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Francisco-Bilbao flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Francisco-Bilbao flights, Cheapflights users trust eDreams the most. eDreams 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 San Francisco-Bilbao 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 San Francisco to Bilbao

Have a flexible travel schedule? Discover the best time to fly to Bilbao from San Francisco 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 San Francisco to Bilbao

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

Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Bilbao. Price data was last updated on November 28, 2025.

The best time to book flights from San Francisco to Bilbao is 86 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, March is the cheapest month in which you can book a flight from San Francisco to Bilbao (average of $395). Flying from San Francisco to Bilbao in June is currently the most expensive (average of $901). 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 SFO to BIO?

Find hourly flight availability from San Francisco to Bilbao. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated diciembre 4, 2025.

It’s optimal to fly from San Francisco to Bilbao in the evening. By choosing this option you can save up to 21% on the cost of your flight, compared to a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Bilbao. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their San Francisco to Bilbao flight should consider departing on Sunday afternoons when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Bilbao

Get insights into the airlines that provide service to Bilbao. 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 Bilbao. Reviews last updated diciembre 4, 2025.
Read reviews from past customers who have flown Delta, KLM, and United Airlines from San Francisco to Bilbao. 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
7.9
Good
8,011 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
7.9
Good
8,011 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.7
Good
1,428 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
9,063 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Iberia
7.0
Good
3,039 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Lufthansa
6.8
Okay
7,612 reviews
Delta
7.9
Good
8,011 reviews

Boarding

8.1

Food

7.3

Entertainment

7.9

Crew

8.5

Comfort

7.9

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Bilbao. 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 San Francisco to Bilbao?

    There are many flights that can get you from San Francisco to Bilbao in 16h 25m. Fly via Lufthansa, United Airlines, or Delta to get the fastest option. The distance from San Francisco to Bilbao is about 5678 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $380, LEVEL will fly you from San Francisco to Bilbao and back. In addition to LEVEL, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from SWISS and KLM - these airlines can fly you to your destination from $447 and $470, respectively. LEVEL is 51% cheaper than the average price of flights available within the next 90 days to this destination.

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

    For one-way options, check prices for Scandinavian Airlines. According to our data, you can fly for as low as $404. Users have also found prices from $413 and $431 on Aer Lingus and TAP AIR PORTUGAL, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Francisco to Bilbao 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 San Francisco to Bilbao?

    Currently, March is the cheapest month in which you can book a flight from San Francisco to Bilbao (average of $395). Flying from San Francisco to Bilbao in June is currently the most expensive (average of $901). 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

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 7 airlines flying from San Francisco to Bilbao

Discover the top 7 airlines that operate flights from San Francisco to Bilbao. 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 diciembre 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
LEVELCheapest$427Average$705FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$447Average$723FlexibilityNo cancel feeOn-time79%
KLMCheapest$470Average$674FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$472Average$680FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$587Average$955FlexibilityNo cancel feeOn-time69%
IberiaCheapest$589Average$1,028FlexibilityNo cancel feeOn-time77%
DeltaCheapest$675Average$894FlexibilityNo cancel feeOn-timeN/A

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