$356+ 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 5/30. 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
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
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 January 20, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $524 (Trip.com) |
One-way from | $356 (OneTravel) |
Popular in | October |
Cheapest in | January |
Average price | $683 |
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 January 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 January 20, 2025.
This Trip.com deal was found by Cheapflights users on 1/19. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This British Airways deal was found by Cheapflights users on 1/20. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This KLM deal was found by Cheapflights users on 1/19. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 1/20. 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.
This American Airlines deal was found by Cheapflights users on 1/20. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Gotogate deal was found by Cheapflights users on 1/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 1/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This oojo deal was found by Cheapflights users on 1/19. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Lufthansa deal was found by Cheapflights users on 1/19. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Brussels Airlines deal was found by Cheapflights users on 1/20. 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 Brussels Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This OneTravel deal was found by Cheapflights users on 1/19. 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 OneTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Iberia deal was found by Cheapflights users on 1/19. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Find flights from Porto to San Francisco within your budget
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 January 20, 2025.
Fly from
Fly to
Route
Depart
Return
Price
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Tue 3/4
8:10 pm-12:35 pm
2 stops24h 25m
San Francisco
Mon 3/10
3:40 pm-7:20 pm
2 stops20h 40m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Mon 3/17
8:20 am-12:20 am
2 stops23h 00m
San Francisco
Tue 4/1
4:35 pm-7:30 pm
1 stop18h 55m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sun 2/2
10:55 am-11:50 am
1 stop32h 55m
San Francisco
Sun 2/16
1:50 pm-7:45 pm
1 stop21h 55m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Mon 3/17
6:20 am-8:56 pm
2 stops21h 36m
San Francisco
Tue 4/1
3:05 pm-3:30 pm
1 stop16h 25m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 2/19
7:20 pm-4:25 pm
1 stop29h 05m
San Francisco
Wed 2/26
7:25 pm-11:10 am
1 stop31h 45m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Fri 2/14
6:00 am-3:31 pm
2 stops41h 31m
San Francisco
Fri 2/21
2:40 pm-3:15 pm
1 stop16h 35m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Tue 3/4
8:00 pm-2:40 pm
1 stop26h 40m
San Francisco
Mon 3/10
5:40 pm-7:00 pm
1 stop18h 20m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 5/7
6:15 am-7:00 pm
1 stop20h 45m
San Francisco
Wed 5/21
1:10 pm-10:45 pm
1 stop25h 35m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 5/7
8:15 am-8:01 pm
2 stops19h 46m
San Francisco
Wed 5/21
6:01 am-7:55 pm
2 stops29h 54m
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Mon 4/7
4:50 pm-12:40 pm
2 stops27h 50m
San Francisco
Sun 4/20
9:05 pm-4:00 pm
2 stops58h 55m
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 January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
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 January 17, 2025.
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 $405). 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?
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 January 20, 2025.
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
Plan your trip to San Francisco by taking into account the average rainfall totals 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
Plan your trip to San Francisco by taking into account the average temperature totals 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
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 January 20, 2025.
To help decide which airline to fly from Porto to San Francisco, see what other customers have to say about TAP AIR PORTUGAL, KLM and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Food
Entertainment
Comfort
Boarding
Overall
Crew
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
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.
Traveling to a place near Porto?
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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 2 airlines flying from Porto to San Francisco
Discover the top 2 airlines 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 January 20, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$647 | Average$729 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$665 | Average$898 | FlexibilityNo cancel fee | On-time76% |