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

Our cheapest airline available from Porto to San Francisco is American Airlines. Our recent data shows that you can find tickets from as low as $633 on this airline. Additional options worth looking into are British Airways and United Airlines, starting at $648 and $663 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 ($435), Air Transat ($518), and Iberia ($534).

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?

January can be a great time to fly to San Francisco from Porto with a flight ticket averaging about $871. Cheapflights users have found deals in the month of January for as cheap as $537. 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.

$361+ 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.

The best prices from Porto to San Francisco are usually found in January or November, 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	$535 (Mytrip)
One-way from	$361 (Kiwi.com)
Popular in	October
Cheapest in	January
Average price	$722

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 ($120 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 February 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 February 20, 2025.

Mon 3/174:05 pmOPO - SFO

2 stops32h 20mMultiple Airlines

Mon 3/317:30 pmSFO - OPO

2 stops18h 55mMultiple Airlines

Deal found 2/20

$535

Wed 5/78:15 amOPO - SFO

2 stops20h 43mAmerican Airlines

Wed 5/2111:57 pmSFO - OPO

2 stops27h 43mAmerican Airlines

Deal found 2/20

$633

Mon 3/175:30 pmOPO - SFO

1 stop29h 30mBritish Airways

Mon 3/314:20 pmSFO - OPO

1 stop19h 30mBritish Airways

Deal found 2/20

$648

Mon 3/1712:25 pmOPO - SFO

1 stop15h 40mUnited Airlines

Mon 3/316:00 amSFO - OPO

1 stop19h 45mUnited Airlines

Deal found 2/20

$663

Tue 5/67:00 amOPO - SFO

1 stop15h 35mTAP AIR PORTUGAL

Thu 5/154:20 pmSFO - OPO

1 stop22h 40mTAP AIR PORTUGAL

Deal found 2/20

$672

Tue 4/2912:35 pmOPO - SFO

1 stop17h 06mBrussels Airlines

Thu 5/812:55 pmSFO - OPO

2 stops19h 05mBrussels Airlines

Deal found 2/20

$706

Tue 4/296:30 amOPO - SFO

2 stops21h 26mDelta

Thu 5/811:05 amSFO - OPO

2 stops20h 25mDelta

Deal found 2/20

$714

Tue 5/612:20 pmOPO - SFO

2 stops19h 45mIberia

Thu 5/155:45 pmSFO - OPO

1 stop29h 50mIberia

Deal found 2/20

$756

Wed 5/78:10 pmOPO - SFO

1 stop23h 35mKLM

Wed 5/211:45 pmSFO - OPO

1 stop21h 50mKLM

Deal found 2/20

$827

Sun 4/64:50 pmOPO - SFO

1 stop25h 45mTurkish Airlines

Wed 4/96:45 pmSFO - OPO

1 stop31h 05mTurkish Airlines

Deal found 2/20

$851

Mon 2/241:45 pmOPO - SFO

1 stop37h 00mLufthansa

Fri 2/281:35 pmSFO - OPO

1 stop26h 00mLufthansa

Deal found 2/19

$885

Mon 6/307:20 pmOPO - SFO

2 stops52h 13mSWISS

Tue 7/87:40 pmSFO - OPO

2 stops38h 50mSWISS

Deal found 2/20

$1,142

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 February 20, 2025.

Mon 3/174:05 pmOPO - SFO

2 stops32h 20mMultiple Airlines

Mon 3/317:30 pmSFO - OPO

2 stops18h 55mMultiple Airlines

Deal found 2/20

$535

Wed 5/78:15 amOPO - SFO

2 stops20h 43mAmerican Airlines

Wed 5/2111:57 pmSFO - OPO

2 stops27h 43mAmerican Airlines

Deal found 2/20

$633

Mon 3/175:30 pmOPO - SFO

1 stop29h 30mBritish Airways

Mon 3/314:20 pmSFO - OPO

1 stop19h 30mBritish Airways

Deal found 2/20

$648

Mon 3/1712:25 pmOPO - SFO

1 stop15h 40mUnited Airlines

Mon 3/316:00 amSFO - OPO

1 stop19h 45mUnited Airlines

Deal found 2/20

$663

Tue 5/67:00 amOPO - SFO

1 stop15h 35mTAP AIR PORTUGAL

Thu 5/154:20 pmSFO - OPO

1 stop22h 40mTAP AIR PORTUGAL

Deal found 2/20

$672

Tue 4/2912:35 pmOPO - SFO

1 stop17h 06mBrussels Airlines

Thu 5/812:55 pmSFO - OPO

2 stops19h 05mBrussels Airlines

Deal found 2/20

$706

Tue 4/296:30 amOPO - SFO

2 stops21h 26mDelta

Thu 5/811:05 amSFO - OPO

2 stops20h 25mDelta

Deal found 2/20

$714

Tue 5/612:20 pmOPO - SFO

2 stops19h 45mIberia

Thu 5/155:45 pmSFO - OPO

1 stop29h 50mIberia

Deal found 2/20

$756

Wed 5/78:10 pmOPO - SFO

1 stop23h 35mKLM

Wed 5/211:45 pmSFO - OPO

1 stop21h 50mKLM

Deal found 2/20

$827

Sun 4/64:50 pmOPO - SFO

1 stop25h 45mTurkish Airlines

Wed 4/96:45 pmSFO - OPO

1 stop31h 05mTurkish Airlines

Deal found 2/20

$851

Mon 6/307:20 pmOPO - SFO

2 stops52h 13mSWISS

Tue 7/87:40 pmSFO - OPO

2 stops38h 50mSWISS

Deal found 2/20

$1,142

Mon 6/306:00 amOPO - SFO

1 stop17h 55mLufthansa

Tue 7/89:05 pmSFO - OPO

2 stops17h 45mLufthansa

Deal found 2/20

$1,214

Last-minute flights from Porto to San Francisco
Discover last-minute flight deals from Porto to San Francisco. Data last updated February 20, 2025 and is based on user searches.

Mon 2/242:35 pmOPO - SFO

2 stops32h 25mIberia

Fri 2/288:40 pmSFO - OPO

2 stops31h 05mIberia

Deal found 2/19

$863

Mon 2/241:45 pmOPO - SFO

1 stop37h 00mLufthansa

Fri 2/281:35 pmSFO - OPO

1 stop26h 00mLufthansa

Deal found 2/19

$885

Mon 3/174:05 pmOPO - SFO

2 stops32h 20mMultiple Airlines

Mon 3/317:30 pmSFO - OPO

2 stops18h 55mMultiple Airlines

Deal found 2/20

$535

Mon 3/1712:25 pmOPO - SFO

2 stops41h 44mAmerican Airlines

Sun 3/3012:25 amSFO - OPO

2 stops23h 10mAmerican Airlines

Deal found 2/20

$643

Mon 3/175:30 pmOPO - SFO

1 stop29h 30mBritish Airways

Mon 3/314:20 pmSFO - OPO

1 stop19h 30mBritish Airways

Deal found 2/20

$648

Mon 3/1712:25 pmOPO - SFO

1 stop15h 40mUnited Airlines

Mon 3/316:00 amSFO - OPO

1 stop19h 45mUnited Airlines

Deal found 2/20

$663

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 February 20, 2025.

Thu 5/296:00 amOPO - SFO

2 stops23h 25mMultiple Airlines

Deal found 2/20

$361

Fri 5/1610:00 pmOPO - SFO

1 stop28h 00mVueling

Deal found 2/19

$435

Mon 6/301:30 pmOPO - SFO

1 stop30h 53mAir Transat

Deal found 2/20

$518

Sun 5/48:35 amOPO - SFO

1 stop17h 25mIberia

Deal found 2/20

$534

Sun 5/411:25 amOPO - SFO

2 stops22h 09mDelta

Deal found 2/20

$634

Mon 3/104:10 pmOPO - SFO

1 stop32h 35mTurkish Airlines

Deal found 2/20

$640

Wed 6/252:35 pmOPO - SFO

2 stops34h 00mSWISS

Deal found 2/20

$844

Tue 7/112:15 pmOPO - SFO

2 stops18h 48mAir Canada

Deal found 2/20

$928

Sun 7/136:45 pmOPO - SFO

2 stops26h 50mAustrian Airlines

Deal found 2/20

$929

Tue 7/1512:35 pmOPO - SFO

3 stops36h 44mUnited Airlines

Deal found 2/20

$961

Tue 4/812:05 pmOPO - SFO

1 stop15h 55mLufthansa

Deal found 2/20

$2,146

Find flights from Porto to San Francisco within your budget

Fly from

Fly to

Route

Depart

Return

Price

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 3/17

4:05 pm-5:25 pm

2 stops32h 20m

San Francisco

Mon 3/31

7:30 pm-10:25 pm

2 stops18h 55m

$535

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 5/7

8:15 am-8:58 pm

2 stops20h 43m

San Francisco

Wed 5/21

11:57 pm-11:40 am

2 stops27h 43m

$633

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 3/17

5:30 pm-4:00 pm

1 stop29h 30m

San Francisco

Mon 3/31

4:20 pm-7:50 pm

1 stop19h 30m

$648

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 3/17

12:25 pm-9:05 pm

1 stop15h 40m

San Francisco

Mon 3/31

6:00 am-9:45 am

1 stop19h 45m

$663

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 5/6

7:00 am-2:35 pm

1 stop15h 35m

San Francisco

Thu 5/15

4:20 pm-11:00 pm

1 stop22h 40m

$672

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 4/29

12:35 pm-9:41 pm

1 stop17h 06m

San Francisco

Thu 5/8

12:55 pm-4:00 pm

2 stops19h 05m

$706

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 4/29

6:30 am-7:56 pm

2 stops21h 26m

San Francisco

Thu 5/8

11:05 am-3:30 pm

2 stops20h 25m

$714

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 5/6

12:20 pm-12:05 am

2 stops19h 45m

San Francisco

Thu 5/15

5:45 pm-7:35 am

1 stop29h 50m

$756

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 5/7

8:10 pm-11:45 am

1 stop23h 35m

San Francisco

Wed 5/21

1:45 pm-7:35 pm

1 stop21h 50m

$827

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sun 4/6

4:50 pm-10:35 am

1 stop25h 45m

San Francisco

Wed 4/9

6:45 pm-9:50 am

1 stop31h 05m

$851

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

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 February.

Provider	Price Accuracy	Trust Score*
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.

Travel insights for flights from Porto to San Francisco

Get recent, data-driven insights about flights from Porto to San Francisco including ideal travel times, pricing trends, and more.

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 $403). 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

Delta

8.0

Very good

8,219 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

8,219 reviews

Delta

8.0

Very good

8,219 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

1,333 reviews

Delta

8.0

Very good

8,219 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

380 reviews

Delta

8.0

Very good

8,219 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

773 reviews

Delta

8.0

Very good

8,219 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

1,568 reviews

Delta

8.0

Very good

8,219 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 American Airlines. Our recent data shows that you can find tickets from as low as $633 on this airline. Additional options worth looking into are British Airways and United Airlines, starting at $648 and $663 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 ($435), Air Transat ($518), and Iberia ($534).
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 $403). 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

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Fairfield

Manteca

Sausalito

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Hayward

Richmond

Hollister

South San Francisco

Antioch

Milpitas

Vallejo

Newark

Alameda

Campbell

Pacific Grove

Sunnyvale

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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$361+ 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 5/29. 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

The best prices from Porto to San Francisco are usually found in January or November, 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 February 20, 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 February 20, 2025.

Find flights from Porto to San Francisco within your budget

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 February.

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.

Travel insights for flights from Porto to San Francisco

Get recent, data-driven insights about flights from Porto to San Francisco including ideal travel times, pricing trends, and more.

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 February 14, 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 February 20, 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

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

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Top airline flying from Porto to San Francisco

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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 February 20, 2025.