$389+ 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 6/15. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SFO
Apr 9 — Apr 161
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
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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
Cheapest
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 March 10, 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 March 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/167:15 am
OPO
- SFO
1 stop18h 40m
Multiple Airlines
Sun 4/197:40 pm
SFO
- OPO
1 stop27h 30m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$555
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
Mon 4/1310:40 pm
OPO
- SFO
1 stop27h 15m
Multiple Airlines
Sun 4/267:40 pm
SFO
- OPO
1 stop28h 20m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$570
This Mytrip deal was found by Cheapflights users on 3/6. 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 4/206:10 am
OPO
- SFO
2 stops19h 50m
Multiple Airlines
Mon 4/273:05 pm
SFO
- OPO
2 stops24h 50m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$646
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 March 10, 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 March 10, 2026.
This KLM deal was found by Cheapflights users on 3/6. 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.
Fri 5/155:00 am
OPO
- SFO
1 stop14h 45m
KLM
Mon 5/183:05 pm
SFO
- OPO
1 stop22h 55m
KLM
Deal found 3/6![KLM logo]()
$710
This Delta deal was found by Cheapflights users on 3/5. 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 3/235:00 am
OPO
- SFO
1 stop14h 50m
Delta
Tue 3/3110:31 am
SFO
- OPO
2 stops20h 59m
Delta
Deal found 3/5![Delta logo]()
$716
This United Airlines deal was found by Cheapflights users on 3/7. 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 4/2112:05 pm
OPO
- SFO
2 stops20h 34m
United Airlines
Mon 4/2712:45 am
SFO
- OPO
2 stops25h 00m
United Airlines
Deal found 3/7![United Airlines logo]()
$744
This American Airlines deal was found by Cheapflights users on 3/5. 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.
Sat 4/188:20 am
OPO
- SFO
2 stops23h 39m
American Airlines
Sun 5/31:40 pm
SFO
- OPO
2 stops18h 20m
American Airlines
Deal found 3/5![American Airlines logo]()
$796
This Delta deal was found by Cheapflights users on 3/5. 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 5/155:00 am
OPO
- SFO
2 stops18h 56m
Delta
Mon 5/182:45 pm
SFO
- OPO
2 stops23h 15m
Delta
Deal found 3/5![Delta logo]()
$716
This KLM deal was found by Cheapflights users on 3/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/245:55 am
OPO
- SFO
1 stop14h 55m
KLM
Fri 5/11:45 pm
SFO
- OPO
1 stop24h 30m
KLM
Deal found 3/10![KLM logo]()
$739
This United Airlines deal was found by Cheapflights users on 3/5. 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.
Mon 3/236:00 am
OPO
- SFO
2 stops36h 49m
United Airlines
Mon 3/3012:45 am
SFO
- OPO
2 stops25h 00m
United Airlines
Deal found 3/5![United Airlines logo]()
$767
This Delta deal was found by Cheapflights users on 3/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/235:00 am
OPO
- SFO
2 stops20h 21m
Delta
Sat 5/22:57 pm
SFO
- OPO
2 stops23h 03m
Delta
Deal found 3/8![Delta logo]()
$716
This KLM deal was found by Cheapflights users on 3/8. 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 4/225:00 am
OPO
- SFO
2 stops18h 21m
KLM
Wed 4/298:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 3/8![KLM logo]()
$751
This United Airlines deal was found by Cheapflights users on 3/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:35 pm
OPO
- SFO
2 stops28h 55m
United Airlines
Sat 4/2512:45 am
SFO
- OPO
2 stops25h 00m
United Airlines
Deal found 3/9![United Airlines logo]()
$768
Last-minute flights from Porto to San FranciscoDiscover last-minute flight deals from Porto to San Francisco. Data last updated March 10, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to San Francisco. Data last updated March 10, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
Mon 4/1310:40 pm
OPO
- SFO
1 stop27h 15m
Multiple Airlines
Sun 4/267:40 pm
SFO
- OPO
1 stop28h 20m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$570
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 4/167:15 am
OPO
- SFO
1 stop18h 40m
Multiple Airlines
Sun 4/197:40 pm
SFO
- OPO
1 stop27h 30m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$555
This Mytrip deal was found by Cheapflights users on 3/6. 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 4/206:10 am
OPO
- SFO
2 stops19h 50m
Multiple Airlines
Mon 4/273:05 pm
SFO
- OPO
2 stops24h 50m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$646
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 March 10, 2026.
Search for one-way flight options from Porto to San Francisco. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 6/156:10 am
OPO
- SFO
2 stops42h 10m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$389
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 6/67:05 am
OPO
- SFO
2 stops44h 05m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$393
This Kiwi.com deal was found by Cheapflights users on 3/6. 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 4/167:15 am
OPO
- SFO
1 stop18h 40m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$411
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
Tue 6/169:30 pm
OPO
- SFO
2 stops49h 00m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$412
This Kiwi.com deal was found by Cheapflights users on 3/9. 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 5/2710:15 pm
OPO
- SFO
3 stops47h 20m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$414
This Kiwi.com deal was found by Cheapflights users on 3/9. 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.
Mon 5/259:15 am
OPO
- SFO
2 stops37h 20m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$417
This French Bee deal was found by Cheapflights users on 3/6. 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 French Bee is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1211:45 am
OPO
- SFO
1 stop17h 05m
Multiple Airlines
Deal found 3/6![Multiple Airlines logo]()
$424
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 3/312:50 pm
OPO
- SFO
3 stops57h 45m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$429
This Kiwi.com deal was found by Cheapflights users on 3/5. 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 6/148:40 pm
OPO
- SFO
2 stops47h 40m
Multiple Airlines
Deal found 3/5![Multiple Airlines logo]()
$432
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 March 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $555 (Kiwi.com) |
One-way from | $389 (Kiwi.com) |
Popular in | October |
Cheapest in | January |
Average price | $856 |
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 March 10, 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 - SFO
OPOSFO
Porto
Fri 5/15
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Mon 5/18
3:05 pm-10:00 pm
1 stop22h 55m
$710
Quickest round-trip
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Mon 3/23
5:00 am-12:50 pm
1 stop14h 50m
San Francisco
Tue 3/31
10:31 am-3:30 pm
2 stops20h 59m
$716
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Fri 5/15
5:00 am-3:56 pm
2 stops18h 56m
San Francisco
Mon 5/18
2:45 pm-10:00 pm
2 stops23h 15m
$716
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Thu 4/23
5:00 am-5:21 pm
2 stops20h 21m
San Francisco
Sat 5/2
2:57 pm-10:00 pm
2 stops23h 03m
$716
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Fri 4/24
5:55 am-12:50 pm
1 stop14h 55m
San Francisco
Fri 5/1
1:45 pm-10:15 pm
1 stop24h 30m
$739
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Tue 4/21
12:05 pm-12:39 am
2 stops20h 34m
San Francisco
Mon 4/27
12:45 am-9:45 am
2 stops25h 00m
$744
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 4/22
5:00 am-3:21 pm
2 stops18h 21m
San Francisco
Wed 4/29
8:10 pm-10:00 pm
1 stop17h 50m
$751
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Mon 3/23
6:00 am-11:49 am
2 stops36h 49m
San Francisco
Mon 3/30
12:45 am-9:45 am
2 stops25h 00m
$767
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Mon 4/13
12:35 pm-9:30 am
2 stops28h 55m
San Francisco
Sat 4/25
12:45 am-9:45 am
2 stops25h 00m
$768
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sat 4/18
8:20 am-11:59 pm
2 stops23h 39m
San Francisco
Sun 5/3
1:40 pm-4:00 pm
2 stops18h 20m
$796
Showing 1-10 of 22 resultsSorted by cheapest first
- 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.
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 March 10, 2026.
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.
Food
6.3
Entertainment
6.5
Crew
7.6
Boarding
7.0
Overall
6.8
Comfort
6.8
Reviews
1 / 20
4.0
OkayDjermouli,Dec 2025
FRA - SFO
Food
6.3
Entertainment
6.5
Crew
7.6
Boarding
7.0
Overall
6.8
Comfort
6.8
Reviews
1 / 20
4.0
OkayDjermouli,Dec 2025
FRA - SFO
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
Livermore
Roseville
Watsonville
San Bruno
Sunnyvale
Vacaville
Turlock
San Carlos
San Ramon
Redwood City
Daly City
Rancho Cordova
San Lorenzo
Davis
Hollister
Manteca
Union City
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Complete your trip to San Francisco by adding a car rental and/or hotel reservation to your travel itinerary.
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Find flights from Porto to San Francisco, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Porto and San Francisco flights
Browse other Porto and San Francisco flight options. Last updated on March 10, 2026.
Other flights from Porto
Browse through other flights departing from Porto. Flights are based on user searches made on Cheapflights and were last updated on March 10, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to San Francisco
Explore flights to San Francisco departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on March 10, 2026.
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 March 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$688 | Average$844 | FlexibilityNo cancel fee | On-time76% |