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

Our cheapest airline available from Porto to San Francisco is KLM. Our recent data shows that you can find tickets from as low as $636 on this airline. Additional options worth looking into are Delta and SWISS, starting at $641 and $724 round-trip. These flights start at 27% lower than the current average price 3 months from now.

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

The cheapest airlines for a one-way flight from Porto to San Francisco are Vueling ($479), Iberia ($480), and TAP AIR PORTUGAL ($486).

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

Travelers seeking maximum savings on their Porto to San Francisco flight should consider departing on Wednesday mornings 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.

What is the cheapest day to fly round-trip from Porto to San Francisco?

Travelers have found that booking a Tuesday departure is the best way to save up to 40% on the cost of booking your flights compared to booking on days of the week where this route is of high demand.

How far in advance should I book a flight from Porto to San Francisco?

Find a great deal and save up to 46% by booking at least 45 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Porto to San Francisco within the next two weeks, with the cheapest ticket starting at $655.

What is the cheapest month to fly from Porto to San Francisco?

February can be a great time to fly to San Francisco from Porto with a flight ticket averaging about $873. Cheapflights users have found deals in the month of February for as cheap as $622. The most expensive prices can be found in the month of October.

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

Most trusted provider : When it comes to deals on Porto-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 Porto-San Francisco flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

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

How can I find direct flights from Porto to San Francisco?

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

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

Yes. Cheapflights offers flight deals from Porto 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.

$336+ Flights from Porto to San Francisco

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Find cheap flights from Porto to San Francisco with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Porto to San Francisco are usually found in February or January, booked 44 days in advance, depart on a Wednesday or Thursday and return on a Thursday

Cheap flight deals from Porto to San Francisco

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$636 (KLM)
One-way from	$336 (Kiwi.com)
Popular in	October
Cheapest in	February
Average price	$705

Provider with most accurate pricing for Porto-San Francisco flight deals.

Search Deals

Provider most trusted by Cheapflights users for Porto-San Francisco flights.

Search Deals

From Porto to San Francisco

Search Deals

One-way flight from Porto to San Francisco

Search Deals

Highest demand for flights based on searches. 11% potential increase in price ($118 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 7% potential price decrease ($61 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

Find flight deals from Porto to San Francisco

Cheapest flights from Porto to San Francisco
Explore the most affordable flight options available from Porto to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2025.

Mon 4/144:20 pmOPO - SFO

1 stop27h 25mKLM

Mon 4/283:05 pmSFO - OPO

1 stop16h 25mKLM

Deal found 3/25

$636

Mon 4/146:35 amOPO - SFO

2 stops24h 08mDelta

Mon 4/283:05 pmSFO - OPO

1 stop16h 25mDelta

Deal found 3/24

$641

Mon 4/145:30 pmOPO - SFO

1 stop26h 15mMultiple Airlines

Mon 4/288:45 pmSFO - OPO

1 stop34h 45mMultiple Airlines

Deal found 3/24

$649

Tue 4/292:35 pmOPO - SFO

2 stops33h 35mSWISS

Thu 5/87:30 pmSFO - OPO

1 stop15h 00mSWISS

Deal found 3/25

$724

Sat 4/266:00 amOPO - SFO

2 stops21h 21mUnited Airlines

Sat 5/311:03 pmSFO - OPO

2 stops32h 37mUnited Airlines

Deal found 3/24

$729

Thu 5/88:15 amOPO - SFO

1 stop15h 55mIberia

Thu 5/155:45 pmSFO - OPO

1 stop29h 50mIberia

Deal found 3/23

$732

Mon 4/1411:45 amOPO - SFO

2 stops37h 13mBritish Airways

Mon 4/282:45 pmSFO - OPO

2 stops21h 05mBritish Airways

Deal found 3/24

$780

Fri 4/44:20 pmOPO - SFO

2 stops36h 20mAir France

Fri 4/1811:09 amSFO - OPO

2 stops25h 26mAir France

Deal found 3/23

$806

Sun 6/110:45 amOPO - SFO

1 stop31h 50mTurkish Airlines

Sun 6/2912:40 pmSFO - OPO

1 stop19h 10mTurkish Airlines

Deal found 3/24

$903

Wed 5/78:15 amOPO - SFO

2 stops37h 04mAmerican Airlines

Tue 5/2012:21 amSFO - OPO

2 stops31h 34mAmerican Airlines

Deal found 3/24

$905

Thu 6/2612:10 pmOPO - SFO

2 stops30h 53mAir Canada

Fri 7/411:47 pmSFO - OPO

1 stop25h 48mAir Canada

Deal found 3/24

$1,057

Thu 6/266:15 amOPO - SFO

2 stops17h 40mLufthansa

Thu 7/32:40 pmSFO - OPO

1 stop24h 05mLufthansa

Deal found 3/24

$1,075

Best flights from Porto to San Francisco
Discover carefully curated flight deals from Porto to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 26, 2025.

Mon 4/144:20 pmOPO - SFO

1 stop27h 25mKLM

Mon 4/283:05 pmSFO - OPO

1 stop16h 25mKLM

Deal found 3/25

$636

Mon 4/146:35 amOPO - SFO

2 stops25h 06mDelta

Mon 4/2811:09 amSFO - OPO

2 stops20h 21mDelta

Deal found 3/24

$641

Mon 4/145:30 pmOPO - SFO

1 stop26h 15mMultiple Airlines

Mon 4/288:45 pmSFO - OPO

1 stop34h 45mMultiple Airlines

Deal found 3/24

$649

Tue 4/292:35 pmOPO - SFO

2 stops33h 35mSWISS

Thu 5/87:30 pmSFO - OPO

1 stop15h 00mSWISS

Deal found 3/25

$724

Sat 4/266:00 amOPO - SFO

2 stops21h 21mUnited Airlines

Sat 5/311:03 pmSFO - OPO

2 stops32h 37mUnited Airlines

Deal found 3/24

$729

Thu 5/88:15 amOPO - SFO

1 stop15h 55mIberia

Thu 5/155:45 pmSFO - OPO

1 stop29h 50mIberia

Deal found 3/23

$732

Mon 4/1411:45 amOPO - SFO

2 stops37h 13mBritish Airways

Mon 4/284:20 pmSFO - OPO

1 stop19h 30mBritish Airways

Deal found 3/24

$780

Fri 4/44:20 pmOPO - SFO

2 stops36h 20mAir France

Fri 4/1811:09 amSFO - OPO

2 stops25h 26mAir France

Deal found 3/23

$806

Sun 6/110:45 amOPO - SFO

1 stop31h 50mTurkish Airlines

Sun 6/2912:40 pmSFO - OPO

1 stop19h 10mTurkish Airlines

Deal found 3/24

$903

Wed 5/78:15 amOPO - SFO

2 stops37h 04mAmerican Airlines

Tue 5/2012:21 amSFO - OPO

2 stops31h 34mAmerican Airlines

Deal found 3/24

$905

Thu 6/2612:10 pmOPO - SFO

2 stops30h 53mAir Canada

Fri 7/411:47 pmSFO - OPO

1 stop25h 48mAir Canada

Deal found 3/24

$1,057

Thu 6/266:15 amOPO - SFO

2 stops17h 40mLufthansa

Thu 7/32:40 pmSFO - OPO

1 stop24h 05mLufthansa

Deal found 3/24

$1,075

Last-minute flights from Porto to San Francisco
Discover last-minute flight deals from Porto to San Francisco. Data last updated March 26, 2025 and is based on user searches.

Thu 4/311:25 amOPO - SFO

1 stop32h 20mKLM

Thu 4/171:45 pmSFO - OPO

1 stop24h 30mKLM

Deal found 3/24

$761

Fri 4/46:40 amOPO - SFO

2 stops25h 39mDelta

Fri 4/1812:17 pmSFO - OPO

2 stops21h 53mDelta

Deal found 3/24

$653

Fri 4/44:20 pmOPO - SFO

2 stops36h 20mAir France

Fri 4/1811:09 amSFO - OPO

2 stops25h 26mAir France

Deal found 3/23

$806

Fri 4/412:35 pmOPO - SFO

1 stop17h 06mMultiple Airlines

Fri 4/187:30 pmSFO - OPO

1 stop28h 25mMultiple Airlines

Deal found 3/23

$871

Fri 4/412:35 pmOPO - SFO

1 stop17h 06mUnited Airlines

Thu 4/1712:43 amSFO - OPO

2 stops25h 02mUnited Airlines

Deal found 3/23

$1,134

Mon 4/144:20 pmOPO - SFO

1 stop27h 25mKLM

Mon 4/283:05 pmSFO - OPO

1 stop16h 25mKLM

Deal found 3/25

$636

Mon 4/146:35 amOPO - SFO

2 stops25h 06mDelta

Mon 4/2811:09 amSFO - OPO

2 stops20h 21mDelta

Deal found 3/24

$641

Mon 4/145:30 pmOPO - SFO

1 stop26h 15mMultiple Airlines

Mon 4/288:45 pmSFO - OPO

1 stop34h 45mMultiple Airlines

Deal found 3/24

$649

Mon 4/1411:45 amOPO - SFO

2 stops37h 13mBritish Airways

Mon 4/284:20 pmSFO - OPO

1 stop19h 30mBritish Airways

Deal found 3/24

$780

Mon 4/214:35 pmOPO - SFO

1 stop28h 05mLufthansa

Fri 5/22:40 pmSFO - OPO

1 stop17h 05mLufthansa

Deal found 3/24

$4,876

Sat 4/266:00 amOPO - SFO

2 stops21h 21mUnited Airlines

Sat 5/311:03 pmSFO - OPO

2 stops32h 37mUnited Airlines

Deal found 3/24

$729

Sat 4/266:00 amOPO - SFO

2 stops23h 46mAir Canada

Fri 5/24:50 pmSFO - OPO

2 stops38h 10mAir Canada

Deal found 3/25

$3,537

One-way flights from Porto to San Francisco
Search for one-way flight options from Porto to San Francisco. Find affordable one-way fares based on user searches. Data last updated March 26, 2025.

Mon 5/124:45 pmOPO - SFO

2 stops29h 50mMultiple Airlines

Deal found 3/25

$336

Thu 8/148:35 amOPO - SFO

1 stop17h 35mVueling

Deal found 3/25

$479

Mon 9/810:00 pmOPO - SFO

1 stop28h 10mIberia

Deal found 3/24

$480

Mon 5/124:00 pmOPO - SFO

1 stop30h 35mTAP AIR PORTUGAL

Deal found 3/25

$486

Mon 9/811:50 amOPO - SFO

2 stops20h 07mBritish Airways

Deal found 3/25

$599

Sun 7/1310:45 amOPO - SFO

1 stop31h 50mTurkish Airlines

Deal found 3/25

$666

Mon 9/89:00 amOPO - SFO

3 stops21h 45mUnited Airlines

Deal found 3/25

$830

Wed 6/256:25 amOPO - SFO

2 stops22h 21mDelta

Deal found 3/25

$892

Sat 8/92:50 amOPO - SFO

2 stops45h 20mSWISS

Deal found 3/25

$1,031

Tue 4/86:00 amOPO - SFO

2 stops21h 20mLufthansa

Deal found 3/24

$2,102

Sat 7/1211:35 amOPO - SFO

2 stops21h 50mAir Europa

Deal found 3/25

$2,332

Cheapflights Fare Finder

Use the filters below to find and compare flights from Porto to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 4/14

4:20 pm-11:45 am

1 stop27h 25m

San Francisco

Mon 4/28

3:05 pm-3:30 pm

1 stop16h 25m

$636

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 4/14

6:35 am-10:43 pm

2 stops24h 08m

San Francisco

Mon 4/28

3:05 pm-3:30 pm

1 stop16h 25m

$641

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 4/14

5:30 pm-11:45 am

1 stop26h 15m

San Francisco

Mon 4/28

8:45 pm-3:30 pm

1 stop34h 45m

$649

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 4/29

2:35 pm-4:10 pm

2 stops33h 35m

San Francisco

Thu 5/8

7:30 pm-6:30 pm

1 stop15h 00m

$724

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 4/26

6:00 am-7:21 pm

2 stops21h 21m

San Francisco

Sat 5/3

11:03 pm-3:40 pm

2 stops32h 37m

$729

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/8

8:15 am-4:10 pm

1 stop15h 55m

San Francisco

Thu 5/15

5:45 pm-7:35 am

1 stop29h 50m

$732

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 4/14

11:45 am-4:58 pm

2 stops37h 13m

San Francisco

Mon 4/28

4:20 pm-7:50 pm

1 stop19h 30m

$780

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 4/4

4:20 pm-8:40 pm

2 stops36h 20m

San Francisco

Fri 4/18

11:09 am-8:35 pm

2 stops25h 26m

$806

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sun 6/1

10:45 am-10:35 am

1 stop31h 50m

San Francisco

Sun 6/29

12:40 pm-3:50 pm

1 stop19h 10m

$903

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 5/7

8:15 am-1:19 pm

2 stops37h 04m

San Francisco

Tue 5/20

12:21 am-3:55 pm

2 stops31h 34m

$905

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 24 results

Compare providers for flights from Porto to San Francisco

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Porto to San Francisco in March.

Provider	Price Accuracy	Trust Score*
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust 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 Porto-San Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Porto-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Porto-San Francisco flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Porto-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 Porto-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 Porto to San Francisco

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

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

The price you pay for your flight from Porto to San Francisco may vary depending on when you book. For the best chance of a lower fare, look to book 44 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 Porto to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Porto to San Francisco (average of $276). Flying from Porto to San Francisco in June is currently the most expensive (average of $398). 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 OPO to SFO?

When flying from Porto to San Francisco, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in San Francisco by month

In terms of precipitation, rainfall in San Francisco ranges from 0.0 - 4.4 inches per month. January is typically the wettest month, when rainfall can reach 4.4 in. July is typically the driest time to visit San Francisco when rainfall is around 0.0 in.

Temperature in San Francisco by month

If weather is an important factor for your trip to San Francisco, use this chart to help with planning. For those seeking warmer temperatures, September is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing San Francisco

To help decide which airline to fly from Porto to San Francisco, see what other customers have to say about Delta, KLM and SWISS. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,891 reviews

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

7,891 reviews

Delta

8.0

Very good

7,891 reviews

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

1,319 reviews

Delta

8.0

Very good

7,891 reviews

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

SWISS

7.5

Good

1,569 reviews

Delta

8.0

Very good

7,891 reviews

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

Air France

7.4

Good

1,423 reviews

Delta

8.0

Very good

7,891 reviews

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

8,608 reviews

Delta

8.0

Very good

7,891 reviews

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

What are the cheapest airlines flying from Porto to San Francisco round-trip?
Our cheapest airline available from Porto to San Francisco is KLM. Our recent data shows that you can find tickets from as low as $636 on this airline. Additional options worth looking into are Delta and SWISS, starting at $641 and $724 round-trip. These flights start at 27% lower than the current average price 3 months from now.
What are the cheapest airlines to fly from Porto to San Francisco one-way?
The cheapest airlines for a one-way flight from Porto to San Francisco are Vueling ($479), Iberia ($480), and TAP AIR PORTUGAL ($486).
Can I find deals for flights from Porto to San Francisco that include hotel bookings?
Yes. In addition to deals on Porto to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Porto to San Francisco?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Porto to San Francisco.
Can I find deals for business class flights from Porto to San Francisco?
Yes. Cheapflights offers flight deals from Porto 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 Porto to San Francisco?
Currently, January is the cheapest month in which you can book a flight from Porto to San Francisco (average of $276). Flying from Porto to San Francisco in June is currently the most expensive (average of $398). 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

Roseville

Mountain View

Santa Cruz

Turlock

Fairfield

South San Francisco

Manteca

Sausalito

Richmond

Watsonville

Hollister

Milpitas

Antioch

Hayward

Vallejo

Newark

Alameda

Campbell

Daly City

Pacific Grove

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Porto to San Francisco

Airline	Cheapest	Average	Flexibility	On-time
Lufthansa	Cheapest$665	Average$898	FlexibilityNo cancel fee	On-time76%

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$336+ Cheap flights from Porto (OPO) 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Porto to San Francisco with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Porto to San Francisco are usually found in February or January, booked 44 days in advance, depart on a Wednesday or Thursday and return on a Thursday

Cheap flight deals from Porto to San Francisco

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Porto to San Francisco

Cheapest flights from Porto to San FranciscoExplore the most affordable flight options available from Porto to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2025.

Explore the most affordable flight options available from Porto to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Porto to San Francisco that are best for you.

Compare providers for flights from Porto 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 Porto to San Francisco in March.

Best time to book a flight from Porto to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Porto with our price prediction graph.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from Porto to San Francisco. Price data was last updated on March 21, 2025.

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

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

Find hourly flight availability from Porto 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 March 26, 2025.

Rainfall in San Francisco by month

Plan your trip to San Francisco by taking into account the average rainfall totals by month.

Temperature in San Francisco by month

Plan your trip to San Francisco by taking into account the average temperature totals by month.

Reviews of airlines servicing San Francisco

To help decide which airline to fly from Porto to San Francisco, see what other customers have to say about Delta, KLM and SWISS. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Porto 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 Porto to San Francisco round-trip?

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

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

How can I find direct flights from Porto to San Francisco?

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

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

Traveling to a place near Porto?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Porto to San Francisco

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Porto to San Francisco

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Travel Smart

Cheapest flights from Porto to San Francisco
Explore the most affordable flight options available from Porto to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2025.