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 $665 on this airline. Additional options worth looking into are Delta and SWISS, starting at $669 and $677 round-trip. These flights start at 24% 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 Iberia ($463), Air Transat ($603), and British Airways ($609).

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 $877. 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Porto-San Francisco flight deals on Cheapflights vs. eDreams >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 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 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.

$387+ Flights from Porto to San Francisco

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$665 (KLM)
One-way from	$387 (Kiwi.com)
Popular in	October
Cheapest in	February
Average price	$809

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. 12% potential increase in price ($123 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 April 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 April 15, 2025.

Wed 6/1111:25 amOPO - SFO

1 stop32h 20mKLM

Tue 6/241:45 pmSFO - OPO

1 stop36h 55mKLM

Deal found 4/13

$665

Fri 5/96:40 amOPO - SFO

2 stops24h 49mDelta

Sun 5/2510:00 amSFO - OPO

2 stops21h 30mDelta

Deal found 4/14

$669

Fri 5/912:15 pmOPO - SFO

1 stop35h 55mSWISS

Sun 5/257:30 pmSFO - OPO

1 stop14h 45mSWISS

Deal found 4/14

$677

Thu 5/18:20 pmOPO - SFO

1 stop23h 25mMultiple Airlines

Mon 5/58:45 pmSFO - OPO

1 stop34h 45mMultiple Airlines

Deal found 4/15

$679

Wed 6/1112:20 pmOPO - SFO

2 stops29h 07mBritish Airways

Tue 6/246:00 amSFO - OPO

2 stops29h 30mBritish Airways

Deal found 4/13

$699

Tue 6/1012:50 pmOPO - SFO

1 stop15h 20mUnited Airlines

Mon 6/236:00 amSFO - OPO

2 stops16h 55mUnited Airlines

Deal found 4/13

$711

Fri 6/136:00 amOPO - SFO

2 stops41h 05mAir Canada

Sun 6/228:45 pmSFO - OPO

2 stops28h 50mAir Canada

Deal found 4/13

$741

Fri 6/135:55 pmOPO - SFO

1 stop30h 35mScandinavian Airlines

Mon 6/237:40 pmSFO - OPO

1 stop31h 20mScandinavian Airlines

Deal found 4/13

$744

Fri 6/136:15 amOPO - SFO

1 stop16h 05mLufthansa

Sun 6/222:40 pmSFO - OPO

1 stop22h 55mLufthansa

Deal found 4/13

$765

Sat 6/146:45 pmOPO - SFO

2 stops32h 15mAustrian Airlines

Mon 6/237:50 pmSFO - OPO

2 stops53h 45mAustrian Airlines

Deal found 4/13

$843

Mon 6/98:35 pmOPO - SFO

1 stop27h 35mIberia

Tue 6/246:00 amSFO - OPO

2 stops17h 35mIberia

Deal found 4/13

$877

Sun 6/158:15 amOPO - SFO

2 stops34h 59mAmerican Airlines

Tue 6/244:35 pmSFO - OPO

2 stops19h 20mAmerican Airlines

Deal found 4/13

$894

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 April 15, 2025.

Wed 6/1111:25 amOPO - SFO

1 stop32h 20mKLM

Tue 6/241:45 pmSFO - OPO

1 stop36h 55mKLM

Deal found 4/13

$665

Fri 5/96:40 amOPO - SFO

2 stops24h 49mDelta

Sun 5/2510:00 amSFO - OPO

2 stops21h 30mDelta

Deal found 4/14

$669

Fri 5/912:15 pmOPO - SFO

1 stop35h 55mSWISS

Sun 5/257:30 pmSFO - OPO

1 stop14h 45mSWISS

Deal found 4/14

$677

Thu 5/18:20 pmOPO - SFO

1 stop23h 25mMultiple Airlines

Mon 5/58:45 pmSFO - OPO

1 stop34h 45mMultiple Airlines

Deal found 4/15

$679

Wed 6/1112:20 pmOPO - SFO

2 stops29h 07mBritish Airways

Tue 6/246:00 amSFO - OPO

2 stops29h 30mBritish Airways

Deal found 4/13

$699

Tue 6/1012:50 pmOPO - SFO

1 stop15h 20mUnited Airlines

Mon 6/236:00 amSFO - OPO

2 stops16h 55mUnited Airlines

Deal found 4/13

$711

Fri 6/136:00 amOPO - SFO

2 stops41h 05mAir Canada

Sun 6/228:45 pmSFO - OPO

2 stops28h 50mAir Canada

Deal found 4/13

$741

Fri 6/135:55 pmOPO - SFO

1 stop30h 35mScandinavian Airlines

Mon 6/237:40 pmSFO - OPO

1 stop31h 20mScandinavian Airlines

Deal found 4/13

$744

Fri 6/136:15 amOPO - SFO

1 stop16h 05mLufthansa

Sun 6/222:40 pmSFO - OPO

1 stop22h 55mLufthansa

Deal found 4/13

$765

Sat 6/146:45 pmOPO - SFO

2 stops32h 15mAustrian Airlines

Mon 6/237:50 pmSFO - OPO

2 stops53h 45mAustrian Airlines

Deal found 4/13

$843

Mon 6/98:35 pmOPO - SFO

1 stop27h 35mIberia

Tue 6/246:00 amSFO - OPO

2 stops17h 35mIberia

Deal found 4/13

$877

Sun 6/158:15 amOPO - SFO

2 stops34h 59mAmerican Airlines

Tue 6/244:35 pmSFO - OPO

2 stops19h 20mAmerican Airlines

Deal found 4/13

$894

Last-minute flights from Porto to San Francisco
Discover last-minute flight deals from Porto to San Francisco. Data last updated April 15, 2025 and is based on user searches.

Mon 4/2111:45 amOPO - SFO

1 stop34h 05mBritish Airways

Tue 5/64:20 pmSFO - OPO

1 stop19h 10mBritish Airways

Deal found 4/13

$729

Mon 4/218:15 amOPO - SFO

2 stops22h 54mAmerican Airlines

Mon 5/512:21 amSFO - OPO

2 stops23h 14mAmerican Airlines

Deal found 4/13

$1,231

Thu 4/246:30 amOPO - SFO

2 stops20h 30mDelta

Mon 5/57:20 amSFO - OPO

2 stops19h 20mDelta

Deal found 4/14

$708

Thu 4/248:15 amOPO - SFO

2 stops20h 59mMultiple Airlines

Tue 5/64:20 pmSFO - OPO

1 stop19h 10mMultiple Airlines

Deal found 4/14

$714

Thu 4/246:30 amOPO - SFO

2 stops21h 27mKLM

Mon 5/51:45 pmSFO - OPO

1 stop24h 30mKLM

Deal found 4/14

$715

Thu 4/2411:30 amOPO - SFO

2 stops34h 10mSWISS

Tue 5/67:30 pmSFO - OPO

1 stop28h 15mSWISS

Deal found 4/14

$1,340

Fri 4/2512:35 pmOPO - SFO

1 stop17h 06mUnited Airlines

Sat 5/310:36 pmSFO - OPO

2 stops33h 04mUnited Airlines

Deal found 4/14

$735

Thu 5/18:20 pmOPO - SFO

1 stop23h 25mMultiple Airlines

Mon 5/58:45 pmSFO - OPO

1 stop34h 45mMultiple Airlines

Deal found 4/15

$679

Wed 5/78:15 amOPO - SFO

2 stops19h 22mIberia

Wed 5/217:21 amSFO - OPO

2 stops28h 34mIberia

Deal found 4/15

$982

Fri 5/96:40 amOPO - SFO

2 stops24h 49mDelta

Sun 5/2510:00 amSFO - OPO

2 stops21h 30mDelta

Deal found 4/14

$669

Fri 5/912:15 pmOPO - SFO

1 stop35h 55mSWISS

Sun 5/257:30 pmSFO - OPO

1 stop14h 45mSWISS

Deal found 4/14

$677

Sun 5/116:20 pmOPO - SFO

1 stop25h 25mKLM

Tue 5/271:45 pmSFO - OPO

1 stop17h 50mKLM

Deal found 4/15

$670

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 April 15, 2025.

Fri 5/1610:40 pmOPO - SFO

3 stops40h 51mMultiple Airlines

Deal found 4/15

$387

Fri 5/1610:00 pmOPO - SFO

1 stop28h 00mIberia

Deal found 4/14

$463

Mon 7/281:30 pmOPO - SFO

1 stop30h 53mAir Transat

Deal found 4/15

$603

Fri 5/1611:15 amOPO - SFO

2 stops20h 51mBritish Airways

Deal found 4/14

$609

Tue 5/137:00 amOPO - SFO

1 stop15h 35mTAP AIR PORTUGAL

Deal found 4/14

$631

Sun 5/44:05 pmOPO - SFO

1 stop26h 30mTurkish Airlines

Deal found 4/14

$673

Wed 6/256:15 amOPO - SFO

2 stops21h 13mLufthansa

Deal found 4/14

$808

Sun 7/1311:20 amOPO - SFO

2 stops19h 53mAir Canada

Deal found 4/14

$874

Sun 7/1311:20 amOPO - SFO

2 stops32h 45mUnited Airlines

Deal found 4/15

$901

Sat 8/28:40 amOPO - SFO

2 stops20h 14mSWISS

Deal found 4/14

$918

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

Wed 6/11

11:25 am-11:45 am

1 stop32h 20m

San Francisco

Tue 6/24

1:45 pm-10:40 am

1 stop36h 55m

$665

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 5/9

6:40 am-11:29 pm

2 stops24h 49m

San Francisco

Sun 5/25

10:00 am-3:30 pm

2 stops21h 30m

$669

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 5/9

12:15 pm-4:10 pm

1 stop35h 55m

San Francisco

Sun 5/25

7:30 pm-6:15 pm

1 stop14h 45m

$677

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/1

8:20 pm-11:45 am

1 stop23h 25m

San Francisco

Mon 5/5

8:45 pm-3:30 pm

1 stop34h 45m

$679

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 6/11

12:20 pm-9:27 am

2 stops29h 07m

San Francisco

Tue 6/24

6:00 am-7:30 pm

2 stops29h 30m

$699

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 6/10

12:50 pm-8:10 pm

1 stop15h 20m

San Francisco

Mon 6/23

6:00 am-6:55 am

2 stops16h 55m

$711

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 6/13

6:00 am-3:05 pm

2 stops41h 05m

San Francisco

Sun 6/22

8:45 pm-9:35 am

2 stops28h 50m

$741

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 6/13

5:55 pm-4:30 pm

1 stop30h 35m

San Francisco

Mon 6/23

7:40 pm-11:00 am

1 stop31h 20m

$744

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 6/13

6:15 am-2:20 pm

1 stop16h 05m

San Francisco

Sun 6/22

2:40 pm-9:35 pm

1 stop22h 55m

$765

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 6/14

6:45 pm-7:00 pm

2 stops32h 15m

San Francisco

Mon 6/23

7:50 pm-9:35 am

2 stops53h 45m

$843

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 23 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 April.

Provider	Price Accuracy	Trust Score*
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust 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 Porto-San Francisco flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Porto-San Francisco flight deals on Cheapflights vs. eDreams >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 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 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 $393). 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 Air Transat. 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

7,917 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

7,917 reviews

Delta

8.0

Very good

7,917 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

1,323 reviews

Delta

8.0

Very good

7,917 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 Transat

7.8

Good

385 reviews

Delta

8.0

Very good

7,917 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

Austrian Airlines

7.6

Good

775 reviews

Delta

8.0

Very good

7,917 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

1,578 reviews

Delta

8.0

Very good

7,917 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 $665 on this airline. Additional options worth looking into are Delta and SWISS, starting at $669 and $677 round-trip. These flights start at 24% 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 Iberia ($463), Air Transat ($603), and British Airways ($609).
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 $393). 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

South San Francisco

Fairfield

Manteca

Sausalito

Richmond

Watsonville

Hollister

Milpitas

Antioch

Vallejo

Newark

Hayward

Alameda

Sunnyvale

Livermore

Campbell

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%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$387+ 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 5/16. 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 April 15, 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 April 15, 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 April.

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 April 11, 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 April 15, 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 Air Transat. 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

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

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

100% Free

Book with Flexibility

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 April 15, 2025.