$374+ 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 2/1. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SFO
Nov 28 — Dec 51
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
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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 October 29, 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 October 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Thu 11/126:05 am -
2 stops42h 00m
Wed 11/254:35 pm -
1 stop14h 25m
Deal found 10/26![Multiple Airlines logo]()
$691
This Mytrip deal was found by Cheapflights users on 10/25. 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 11/91:50 pm -
2 stops29h 55m
Wed 11/253:10 pm -
2 stops20h 00m
Deal found 10/25![Multiple Airlines logo]()
$743
This Scandinavian Airlines deal was found by Cheapflights users on 10/29. 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.
Sun 11/85:35 pm -
1 stop29h 15m
Wed 11/184:45 pm -
1 stop16h 20m
Deal found 10/29![Scandinavian Airlines logo]()
$762
This Delta deal was found by Cheapflights users on 10/29. 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 11/125:00 am -
1 stop14h 45m
Wed 11/253:10 pm -
1 stop22h 50m
Deal found 10/29![Delta logo]()
$777
This Delta deal was found by Cheapflights users on 10/29. 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 11/125:00 am -
2 stops20h 13m
Sun 11/226:00 am -
2 stops20h 35m
Deal found 10/29![Delta logo]()
$782
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 October 29, 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 October 29, 2026.
This Scandinavian Airlines deal was found by Cheapflights users on 10/25. 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.
Fri 2/265:45 pm -
2 stops36h 12m
Thu 4/84:45 pm -
1 stop16h 20m
Deal found 10/25![Scandinavian Airlines logo]()
$714
This Delta deal was found by Cheapflights users on 10/25. 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 11/95:00 am -
1 stop14h 45m
Wed 11/253:10 pm -
1 stop22h 50m
Deal found 10/25![Delta logo]()
$792
This KLM deal was found by Cheapflights users on 10/28. 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.
Tue 1/195:00 am -
2 stops19h 21m
Tue 2/167:15 am -
2 stops19h 20m
Deal found 10/28![Multiple Airlines logo]()
$794
This deal was found by Cheapflights users on 10/26. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2512:35 pm -
1 stop19h 24m
Thu 4/810:20 am -
1 stop15h 25m
Deal found 10/26![United Airlines logo]()
$799
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.
Thu 1/148:00 pm -
1 stop28h 05m
Mon 1/184:35 pm -
1 stop14h 25m
Deal found 10/27![TAP AIR PORTUGAL logo]()
$879
This United Airlines deal was found by Cheapflights users on 10/24. 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.
Thu 1/146:00 am -
1 stop18h 05m
Mon 1/181:55 pm -
1 stop17h 30m
Deal found 10/24![United Airlines logo]()
$872
This United Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 11/1312:35 pm -
1 stop15h 35m
Wed 11/1812:05 pm -
1 stop13h 25m
Deal found 10/29![United Airlines logo]()
$884
This United Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 11/136:00 am -
1 stop22h 10m
Thu 11/197:00 am -
2 stops18h 30m
Deal found 10/29![United Airlines logo]()
$884
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:00 am -
1 stop18h 05m
Wed 11/2510:05 am -
1 stop15h 25m
Deal found 10/27![United Airlines logo]()
$889
This United Airlines deal was found by Cheapflights users on 10/29. 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
Thu 12/3112:45 am -
2 stops24h 45m
Deal found 10/29![United Airlines logo]()
$912
Last-minute flights from Porto to San FranciscoDiscover last-minute flight deals from Porto to San Francisco. Data last updated October 29, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to San Francisco. Data last updated October 29, 2026 and is based on user searches.
This Scandinavian Airlines deal was found by Cheapflights users on 10/29. 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.
Sun 11/85:35 pm -
1 stop29h 15m
Wed 11/184:45 pm -
1 stop16h 20m
Deal found 10/29![Scandinavian Airlines logo]()
$762
This Mytrip deal was found by Cheapflights users on 10/25. 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 11/91:50 pm -
2 stops29h 55m
Wed 11/253:10 pm -
2 stops20h 00m
Deal found 10/25![Multiple Airlines logo]()
$743
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Thu 11/126:05 am -
2 stops42h 00m
Wed 11/254:35 pm -
1 stop14h 25m
Deal found 10/26![Multiple Airlines logo]()
$691
This Delta deal was found by Cheapflights users on 10/29. 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 11/125:00 am -
1 stop14h 45m
Wed 11/253:10 pm -
1 stop22h 50m
Deal found 10/29![Delta logo]()
$777
This Delta deal was found by Cheapflights users on 10/29. 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 11/125:00 am -
2 stops20h 13m
Sun 11/226:00 am -
2 stops20h 35m
Deal found 10/29![Delta logo]()
$782
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 October 29, 2026.
Search for one-way flight options from Porto to San Francisco. Find affordable one-way fares based on user searches. Data last updated October 29, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/17:05 am -
3 stops39h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Multiple Airlines logo]()
$374
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/136:15 am -
2 stops40h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Multiple Airlines logo]()
$392
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Mon 12/1410:05 pm -
2 stops48h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Multiple Airlines logo]()
$393
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Tue 12/156:00 am -
2 stops40h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Multiple Airlines logo]()
$395
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/308:05 pm -
2 stops50h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Multiple Airlines logo]()
$409
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/128:40 pm -
2 stops26h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Multiple Airlines logo]()
$410
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/118:55 pm -
2 stops49h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Multiple Airlines logo]()
$412
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Mon 4/127:00 am -
2 stops39h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Multiple Airlines logo]()
$415
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 1/163:30 pm -
3 stops54h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Multiple Airlines logo]()
$417
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
Sun 11/86:15 am -
2 stops40h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Multiple Airlines logo]()
$425
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 October 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $627 (oojo) |
One-way from | $374 (Kiwi.com) |
Popular in | June |
Cheapest in | November |
Average price | $743 |
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 October 29, 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
Quickest round-trip
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Tue 4/13
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$556
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Mon 4/12
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$556
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Tue 12/15
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$560
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Wed 12/16
5:00 am-3:40 pm
2 stops18h 40m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$564
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Sat 1/16
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$567
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Sun 11/8
8:00 am-8:10 pm
1 stop20h 10m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$582
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Sat 3/27
8:40 pm-4:05 pm
1 stop26h 25m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$583
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Mon 3/29
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$598
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Sun 11/29
10:00 pm-2:50 pm
3 stops48h 50m
San Francisco
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$633
PortoSan Francisco
OPO Porto - SFO San Francisco
OPOSFO
Porto
Fri 2/26
5:45 pm-9:57 pm
2 stops36h 12m
San Francisco
Thu 4/8
4:45 pm-5:05 pm
1 stop16h 20m
$714
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 October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 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
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
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Santa Cruz
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Newark
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Vallejo
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Fairfield
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Manteca
San Bruno
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