$490+ Cheap flights from Porto (OPO) to San Francisco (SFO)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SFO
Oct 13 — Oct 201
Round-trip
1 adult, Economy
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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.Cheap flight deals from Porto to San Francisco
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Best
Last-minute
One-way
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 September 13, 2026.
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 September 13, 2026.
This Trip.com deal was found by Cheapflights users on 9/10. 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.
Sat 11/2112:00 pm -
1 stop34h 50m
Sat 12/54:45 pm -
1 stop34h 20m
Deal found 9/10![Scandinavian Airlines logo]()
$611
This lol.travel deal was found by Cheapflights users on 9/10. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/510:30 pm -
1 stop23h 05m
Mon 10/194:30 pm -
1 stop16h 30m
Deal found 9/10![TAP AIR PORTUGAL logo]()
$685
This Rumbo deal was found by Cheapflights users on 9/13. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/58:00 pm -
1 stop28h 05m
Wed 12/24:35 pm -
1 stop14h 25m
Deal found 9/13![TAP AIR PORTUGAL logo]()
$692
This Scandinavian Airlines deal was found by Cheapflights users on 9/11. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:50 pm -
1 stop29h 00m
Sat 11/144:45 pm -
1 stop34h 20m
Deal found 9/11![Scandinavian Airlines logo]()
$693
This Scandinavian Airlines deal was found by Cheapflights users on 9/13. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:50 pm -
1 stop29h 00m
Sat 11/147:00 am -
2 stops25h 45m
Deal found 9/13![Scandinavian Airlines logo]()
$695
This oojo deal was found by Cheapflights users on 9/12. 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.
Wed 11/1111:55 am -
1 stop34h 55m
Tue 4/134:45 pm -
1 stop34h 15m
Deal found 9/12![Scandinavian Airlines logo]()
$700
This FlightHub deal was found by Cheapflights users on 9/8. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/215:05 am -
1 stop17h 30m
Fri 10/308:15 pm -
1 stop13h 45m
Deal found 9/8![TAP AIR PORTUGAL logo]()
$725
This Mytrip deal was found by Cheapflights users on 9/9. 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.
Mon 10/59:45 pm -
2 stops23h 05m
Mon 10/193:05 pm -
2 stops24h 50m
Deal found 9/9![Multiple Airlines logo]()
$731
This TAP AIR PORTUGAL deal was found by Cheapflights users on 9/10. 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 12/224:00 pm -
1 stop30h 45m
Fri 1/17:15 pm -
1 stop28h 15m
Deal found 9/10![TAP AIR PORTUGAL logo]()
$732
Best flights from Porto to San FranciscoDiscover 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 September 13, 2026.
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 September 13, 2026.
This TAP AIR PORTUGAL deal was found by Cheapflights users on 9/10. 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 12/224:00 pm -
1 stop30h 45m
Fri 1/17:15 pm -
1 stop28h 15m
Deal found 9/10![TAP AIR PORTUGAL logo]()
$732
This Scandinavian Airlines deal was found by Cheapflights users on 9/11. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:50 pm -
1 stop29h 00m
Sun 11/157:00 am -
2 stops20h 05m
Deal found 9/11![Scandinavian Airlines logo]()
$737
This Delta deal was found by Cheapflights users on 9/9. 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.
Thu 11/55:00 am -
1 stop14h 45m
Wed 12/24:35 pm -
2 stops21h 25m
Deal found 9/9![Delta logo]()
$738
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Tue 12/2212:35 pm -
1 stop15h 35m
Fri 1/15:00 am -
2 stops20h 30m
Deal found 9/10![United Airlines logo]()
$868
This British Airways deal was found by Cheapflights users on 9/9. 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.
Mon 10/59:25 pm -
1 stop24h 25m
Mon 10/197:30 pm -
1 stop16h 35m
Deal found 9/9![British Airways logo]()
$1,001
This Delta deal was found by Cheapflights users on 9/12. 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.
Wed 9/235:00 am -
2 stops21h 09m
Wed 10/712:05 pm -
2 stops19h 20m
Deal found 9/12![Delta logo]()
$741
This Delta deal was found by Cheapflights users on 9/13. 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 9/255:55 am -
1 stop20h 05m
Tue 10/68:10 pm -
1 stop17h 55m
Deal found 9/13![Delta logo]()
$743
This Scandinavian Airlines deal was found by Cheapflights users on 9/11. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/712:00 pm -
1 stop34h 50m
Mon 11/164:45 pm -
1 stop34h 20m
Deal found 9/11![Scandinavian Airlines logo]()
$830
This Delta deal was found by Cheapflights users on 9/12. 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.
Sat 9/265:00 am -
2 stops19h 58m
Tue 10/612:05 pm -
2 stops19h 20m
Deal found 9/12![Delta logo]()
$818
This Delta deal was found by Cheapflights users on 9/13. 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.
Mon 10/54:25 pm -
1 stop33h 35m
Mon 10/193:05 pm -
1 stop16h 20m
Deal found 9/13![Delta logo]()
$1,006
Last-minute flights from Porto to San FranciscoDiscover last-minute flight deals from Porto to San Francisco. Data last updated September 13, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to San Francisco. Data last updated September 13, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 9/12. 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.
Wed 9/235:00 am -
1 stop14h 45m
Wed 10/712:05 pm -
2 stops19h 20m
Deal found 9/12![Delta logo]()
$736
This Delta deal was found by Cheapflights users on 9/12. 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 9/255:00 am -
2 stops21h 17m
Tue 10/68:10 pm -
1 stop17h 55m
Deal found 9/12![Delta logo]()
$741
This Delta deal was found by Cheapflights users on 9/9. 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.
Wed 9/305:00 am -
1 stop14h 45m
Mon 10/267:00 am -
2 stops20h 35m
Deal found 9/9![Delta logo]()
$738
This lol.travel deal was found by Cheapflights users on 9/10. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/510:30 pm -
1 stop23h 05m
Mon 10/194:30 pm -
1 stop16h 30m
Deal found 9/10![TAP AIR PORTUGAL logo]()
$685
This Mytrip deal was found by Cheapflights users on 9/9. 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.
Mon 10/59:45 pm -
2 stops23h 05m
Mon 10/193:05 pm -
2 stops24h 50m
Deal found 9/9![Multiple Airlines logo]()
$731
This FlightHub deal was found by Cheapflights users on 9/8. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/215:05 am -
1 stop17h 30m
Fri 10/308:15 pm -
1 stop13h 45m
Deal found 9/8![TAP AIR PORTUGAL logo]()
$725
This KLM deal was found by Cheapflights users on 9/8. 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.
Wed 10/217:10 pm -
1 stop24h 35m
Thu 10/292:50 pm -
1 stop19h 15m
Deal found 9/8![KLM logo]()
$742
This Trip.com deal was found by Cheapflights users on 9/13. 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.
Thu 10/295:50 pm -
1 stop29h 00m
Sat 11/144:45 pm -
1 stop16h 00m
Deal found 9/13![Scandinavian Airlines logo]()
$611
One-way flights from Porto to San FranciscoSearch for one-way flight options from Porto to San Francisco. Find affordable one-way fares based on user searches. Data last updated September 13, 2026.
Search for one-way flight options from Porto to San Francisco. Find affordable one-way fares based on user searches. Data last updated September 13, 2026.
This Connections by easyJet deal was found by Cheapflights users on 9/12. 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 Connections by easyJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:30 am -
1 stop21h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Multiple Airlines logo]()
$490
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/177:50 pm -
2 stops50h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Multiple Airlines logo]()
$535
This Delta deal was found by Cheapflights users on 9/12. 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.
Wed 11/115:00 am -
2 stops20h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Delta logo]()
$548
This Kiwi.com deal was found by Cheapflights users on 9/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/98:40 pm -
2 stops49h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Multiple Airlines logo]()
$550
This Kiwi.com deal was found by Cheapflights users on 9/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/78:15 pm -
2 stops56h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Multiple Airlines logo]()
$567
This KAYAK deal was found by Cheapflights users on 9/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3012:25 pm -
2 stops42h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Iberia logo]()
$568
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/287:05 pm -
3 stops53h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Multiple Airlines logo]()
$572
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/66:25 am -
3 stops45h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Multiple Airlines logo]()
$573
Find 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 September 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $611 (Trip.com) |
One-way from | $490 (Connections by easyJet) |
Popular in | June |
Cheapest in | January |
Average price | $802 |
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 7,457,451 searches. Data last updated September 13, 2026.
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
Cheapest round-trip
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Wed 11/11
6:30 am-8:10 pm
1 stop21h 40m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$490
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Sat 1/9
8:40 pm-2:25 pm
2 stops49h 45m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$551
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Fri 10/30
5:55 am-8:40 pm
2 stops21h 45m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$605
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Mon 10/19
10:30 pm-1:35 pm
1 stop23h 05m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$676
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Sat 10/3
12:15 pm-10:22 am
2 stops54h 07m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$685
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Tue 12/22
4:00 pm-2:45 pm
1 stop30h 45m
San Francisco
Fri 1/1
7:15 pm-7:30 am
1 stop28h 15m
$732
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Thu 11/5
5:50 pm-2:50 pm
1 stop29h 00m
San Francisco
Sun 11/15
7:00 am-11:05 am
2 stops20h 05m
$737
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Thu 11/5
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Wed 12/2
4:35 pm-10:00 pm
2 stops21h 25m
$738
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Wed 9/23
5:00 am-6:09 pm
2 stops21h 09m
San Francisco
Wed 10/7
12:05 pm-3:25 pm
2 stops19h 20m
$741
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Fri 9/25
5:55 am-6:00 pm
1 stop20h 05m
San Francisco
Tue 10/6
8:10 pm-10:05 pm
1 stop17h 55m
$743
Showing 1-10 of 20 resultsSorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*1 star |
- 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.
OPO-SFO
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 $704). Flying from Porto to San Francisco in June is currently the most expensive (average of $1,565). 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.
How much does it cost to fly round-trip from Porto to San Francisco?
Airfare is below average for this route at the moment.
Porto to San Francisco flights typically cost between $748 and $858 in November.The cheapest round-trip price found within the last 5 days was $611 on Scandinavian Airlines (Nov 21-Dec 5).
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 San Francisco?
Book flights to San Francisco if you plan to visit one of these locationsSouth San Francisco
Santa Clara
Santa Cruz
Walnut Creek
Emeryville
San Bruno
Burlingame
Rancho Cordova
Roseville
Fairfield
Cupertino
Newark
Hayward
San Ramon
Redwood City
Manteca
Vallejo
San Carlos
Turlock
Davis
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.
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