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$414+ 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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SFO
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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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 October 29, 2025.

This Ticket deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/149:00 amOPO - SFO
1 stop15h 05mTAP AIR PORTUGAL
Fri 11/287:10 pmSFO - OPO
1 stop14h 50mTAP AIR PORTUGAL
Deal found 10/27$596
This Mytrip deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/128:05 pmOPO - SFO
2 stops25h 20mMultiple Airlines
Sun 11/161:55 pmSFO - OPO
2 stops25h 05mMultiple Airlines
Deal found 10/27$663
This Mytrip deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/24:05 pmOPO - SFO
2 stops27h 45mMultiple Airlines
Tue 12/91:55 pmSFO - OPO
2 stops21h 30mMultiple Airlines
Deal found 10/27$666
This TAP AIR PORTUGAL deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/212:00 pmOPO - SFO
1 stop34h 30mTAP AIR PORTUGAL
Sat 12/64:35 pmSFO - OPO
1 stop21h 25mTAP AIR PORTUGAL
Deal found 10/27$703
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/146:30 amOPO - SFO
2 stops25h 29mDelta
Fri 11/285:45 amSFO - OPO
2 stops20h 45mDelta
Deal found 10/27$715

Cheap flight deals from Porto to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Porto (OPO) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$596
(Ticket)

One-way from

$414
(Kiwi.com)

Popular in

October

Cheapest in

February

Average price

$1,538
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. 14% potential increase in price ($146 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($64 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Porto to San Francisco that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 29, 2025.
Use the filters below to find and compare flights from Porto to San Francisco that are best for you.

Fly from

Porto

Fly to

San Francisco

Route

Depart

Return

Price

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 4/20

10:35 pm-2:35 pm

1 stop24h 00m

San Francisco

Tue 5/5

4:35 pm-12:40 am

1 stop24h 05m

$596

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 11/14

9:00 am-4:05 pm

1 stop15h 05m

San Francisco

Fri 11/28

7:10 pm-6:00 pm

1 stop14h 50m

$596

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 12/2

4:05 pm-11:50 am

2 stops27h 45m

San Francisco

Tue 12/9

1:55 pm-7:25 pm

2 stops21h 30m

$666

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 11/12

12:45 pm-12:40 pm

3 stops31h 55m

San Francisco

Sun 11/16

7:25 pm-11:00 pm

2 stops19h 35m

$668

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 4/25

4:50 pm-6:00 pm

1 stop33h 10m

San Francisco

Sun 5/10

7:45 pm-8:00 am

1 stop28h 15m

$701

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 12/2

12:00 pm-2:30 pm

1 stop34h 30m

San Francisco

Sat 12/6

4:35 pm-10:00 pm

1 stop21h 25m

$703

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 12/5

4:10 pm-11:50 am

1 stop27h 40m

San Francisco

Thu 12/11

1:55 pm-1:20 pm

1 stop15h 25m

$715

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 11/14

6:30 am-11:59 pm

2 stops25h 29m

San Francisco

Fri 11/28

5:45 am-10:30 am

2 stops20h 45m

$715

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 1/17

5:10 pm-7:27 pm

2 stops58h 17m

$414

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 12/5

1:40 pm-2:45 pm

2 stops33h 05m

$462

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 13 results
1
2

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 October.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 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

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 $562). Flying from Porto to San Francisco in July is currently the most expensive (average of $824). 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.

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated October 29, 2025.
Peruse reviews from past customers who have flown with Lufthansa from Porto to San Francisco to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Lufthansa
6.8
Okay
7,541 reviews

Crew

7.6

Overall

6.8

Food

6.3

Comfort

6.8

Boarding

7.0

Entertainment

6.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Jan 2025

FRA - TPA

I had ordered a gluten-free meal through you I double triple checked that through you got screamed at by one of your representatives. She yelled at me and said that she had ordered the mail, she had chosen my seat, and made sure that all my baggage is were paid for. That was a lie. My experience with discover airlines in and of itself was GOOD but your representative was out of line did not do anything that she screamed at me and told me she did and I literally had to call the airlines myself to get my seat selected to double check on my gluten-free meal which still was not on board and to pay for my bags which I thought that I paid for all of them until I got to the airport and I still had to pay for my check back. So cheap flights I will never use you again.
Lufthansa
6.8
Okay
7,541 reviews
Lufthansa
6.8
Okay
7,541 reviews

Crew

7.6

Overall

6.8

Food

6.3

Comfort

6.8

Boarding

7.0

Entertainment

6.4

Reviews

1 / 20
8.0
Excellent

Anonymous,Jan 2025

FRA - TPA

I had ordered a gluten-free meal through you I double triple checked that through you got screamed at by one of your representatives. She yelled at me and said that she had ordered the mail, she had chosen my seat, and made sure that all my baggage is were paid for. That was a lie. My experience with discover airlines in and of itself was GOOD but your representative was out of line did not do anything that she screamed at me and told me she did and I literally had to call the airlines myself to get my seat selected to double check on my gluten-free meal which still was not on board and to pay for my bags which I thought that I paid for all of them until I got to the airport and I still had to pay for my check back. So cheap flights I will never use you again.

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.

  • How long is the flight from Porto to San Francisco?

    Airlines like TAP AIR PORTUGAL fly from Porto to San Francisco in about 24h. The time it takes to get you to your destination can typically vary by up to . There are 5566 mi between Porto and San Francisco.

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

    Our cheapest airline available from Porto to San Francisco is Lufthansa. Our recent data shows that you can find tickets from as low as $670 on this airline. This flight start at 20% lower than the current average price 3 months from now.

  • 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 $562). Flying from Porto to San Francisco in July is currently the most expensive (average of $824). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
South San Francisco
Santa Cruz
Livermore
Turlock
Watsonville
Sunnyvale
Santa Clara
Antioch
Manteca
Vallejo
Hollister
Vacaville
San Bruno
Foster City
Redwood City
Union City
Fairfield
Burlingame
Lodi

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Porto to San Francisco

Discover the top airline that operate flights from Porto to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$670Average$847FlexibilityNo cancel feeOn-time76%

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