$339+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SFO
Mar 13 — Mar 201
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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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 February 11, 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 February 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 3/95:35 pm
OPO
- SFO
1 stop29h 00m
Scandinavian Airlines
Mon 3/235:40 pm
SFO
- OPO
1 stop32h 55m
Scandinavian Airlines
Deal found 2/9![Scandinavian Airlines logo]()
$645
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 4/155:55 pm
OPO
- SFO
2 stops50h 50m
Multiple Airlines
Sun 4/267:40 pm
SFO
- OPO
1 stop27h 30m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$648
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Mon 4/1310:00 pm
OPO
- SFO
2 stops24h 35m
Multiple Airlines
Sun 4/267:40 pm
SFO
- OPO
1 stop28h 20m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$667
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Thu 4/1610:00 pm
OPO
- SFO
2 stops26h 50m
Multiple Airlines
Sun 4/267:40 pm
SFO
- OPO
1 stop28h 20m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$687
This LEVEL deal was found by Cheapflights users on 2/8. 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 LEVEL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/154:50 pm
OPO
- SFO
1 stop33h 05m
LEVEL
Sun 4/267:40 pm
SFO
- OPO
1 stop28h 20m
LEVEL
Deal found 2/8![LEVEL logo]()
$713
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Fri 4/178:45 pm
OPO
- SFO
2 stops28h 50m
Multiple Airlines
Sun 4/267:40 pm
SFO
- OPO
1 stop27h 30m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$716
This KLM deal was found by Cheapflights users on 2/7. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/158:15 pm
OPO
- SFO
1 stop23h 30m
KLM
Mon 5/188:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 2/7![KLM logo]()
$720
This Delta deal was found by Cheapflights users on 2/8. 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.
Mon 3/95:00 am
OPO
- SFO
1 stop14h 50m
Delta
Mon 3/237:25 am
SFO
- OPO
2 stops20h 05m
Delta
Deal found 2/8![Delta logo]()
$722
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 February 11, 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 February 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 4/155:55 pm
OPO
- SFO
2 stops50h 50m
Multiple Airlines
Sun 4/267:40 pm
SFO
- OPO
1 stop27h 30m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$648
This LEVEL deal was found by Cheapflights users on 2/8. 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 LEVEL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/154:50 pm
OPO
- SFO
1 stop33h 05m
LEVEL
Sun 4/267:40 pm
SFO
- OPO
1 stop28h 20m
LEVEL
Deal found 2/8![LEVEL logo]()
$713
This KLM deal was found by Cheapflights users on 2/7. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/158:15 pm
OPO
- SFO
1 stop23h 30m
KLM
Mon 5/188:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 2/7![KLM logo]()
$720
This Delta deal was found by Cheapflights users on 2/8. 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.
Fri 5/155:00 am
OPO
- SFO
1 stop14h 45m
Delta
Mon 5/189:30 am
SFO
- OPO
2 stops21h 55m
Delta
Deal found 2/8![Delta logo]()
$721
This Delta deal was found by Cheapflights users on 2/8. 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.
Mon 3/95:00 am
OPO
- SFO
1 stop14h 50m
Delta
Mon 3/237:25 am
SFO
- OPO
2 stops20h 05m
Delta
Deal found 2/8![Delta logo]()
$722
This KLM deal was found by Cheapflights users on 2/10. 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.
Sun 4/57:00 pm
OPO
- SFO
1 stop24h 45m
KLM
Mon 4/208:10 pm
SFO
- OPO
1 stop35h 15m
KLM
Deal found 2/10![KLM logo]()
$726
This KLM deal was found by Cheapflights users on 2/8. 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.
Tue 4/1411:30 am
OPO
- SFO
1 stop32h 15m
KLM
Sun 4/261:45 pm
SFO
- OPO
1 stop17h 45m
KLM
Deal found 2/8![KLM logo]()
$726
Last-minute flights from Porto to San FranciscoDiscover last-minute flight deals from Porto to San Francisco. Data last updated February 11, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to San Francisco. Data last updated February 11, 2026 and is based on user searches.
This Gotogate deal was found by Cheapflights users on 2/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/154:00 pm
OPO
- SFO
1 stop30h 35m
TAP AIR PORTUGAL
Mon 2/234:35 pm
SFO
- OPO
1 stop31h 20m
TAP AIR PORTUGAL
Deal found 2/10![TAP AIR PORTUGAL logo]()
$777
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 3/95:35 pm
OPO
- SFO
1 stop29h 00m
Scandinavian Airlines
Mon 3/235:40 pm
SFO
- OPO
1 stop32h 55m
Scandinavian Airlines
Deal found 2/9![Scandinavian Airlines logo]()
$645
This Delta deal was found by Cheapflights users on 2/8. 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.
Mon 3/95:00 am
OPO
- SFO
1 stop14h 50m
Delta
Mon 3/237:25 am
SFO
- OPO
2 stops20h 05m
Delta
Deal found 2/8![Delta logo]()
$722
This United Airlines deal was found by Cheapflights users on 2/9. 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 3/96:00 am
OPO
- SFO
1 stop22h 10m
United Airlines
Mon 3/233:40 pm
SFO
- OPO
1 stop16h 15m
United Airlines
Deal found 2/9![United Airlines logo]()
$756
This United Airlines deal was found by Cheapflights users on 2/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 am
OPO
- SFO
2 stops40h 48m
United Airlines
Wed 4/18:15 am
SFO
- OPO
2 stops23h 25m
United Airlines
Deal found 2/8![United Airlines logo]()
$762
This Lufthansa deal was found by Cheapflights users on 2/11. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2612:30 pm
OPO
- SFO
1 stop15h 40m
Multiple Airlines
Sun 4/127:35 pm
SFO
- OPO
1 stop14h 55m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$734
This United Airlines deal was found by Cheapflights users on 2/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2612:30 pm
OPO
- SFO
1 stop15h 40m
United Airlines
Sun 4/1210:50 pm
SFO
- OPO
2 stops28h 25m
United Airlines
Deal found 2/11![United Airlines logo]()
$761
This United Airlines deal was found by Cheapflights users on 2/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2612:30 pm
OPO
- SFO
1 stop15h 40m
United Airlines
Fri 4/1012:45 am
SFO
- OPO
2 stops26h 30m
United Airlines
Deal found 2/11![United Airlines logo]()
$785
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 February 11, 2026.
Search for one-way flight options from Porto to San Francisco. Find affordable one-way fares based on user searches. Data last updated February 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 4/155:55 pm
OPO
- SFO
3 stops46h 23m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$339
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1310:00 pm
OPO
- SFO
1 stop27h 55m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$352
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1610:05 pm
OPO
- SFO
1 stop27h 50m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$357
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/810:00 pm
OPO
- SFO
1 stop28h 00m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$364
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:05 am
OPO
- SFO
2 stops20h 50m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$388
This Mytrip deal was found by Cheapflights users on 2/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:55 pm
OPO
- SFO
2 stops33h 35m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$402
This Kiwi.com deal was found by Cheapflights users on 2/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/267:25 am
OPO
- SFO
2 stops40h 40m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$416
This Kiwi.com deal was found by Cheapflights users on 2/9. 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.
Sun 5/177:45 am
OPO
- SFO
2 stops22h 10m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$422
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 February 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $645 (Kiwi.com) |
One-way from | $339 (Kiwi.com) |
Popular in | October |
Cheapest in | March |
Average price | $836 |
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 February 11, 2026.
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
Wed 4/15
5:55 pm-12:45 pm
2 stops50h 50m
San Francisco
Sun 4/26
7:40 pm-7:10 am
1 stop27h 30m
$648
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 4/15
4:50 pm-5:55 pm
1 stop33h 05m
San Francisco
Sun 4/26
7:40 pm-8:00 am
1 stop28h 20m
$713
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Fri 5/15
8:15 pm-11:45 am
1 stop23h 30m
San Francisco
Mon 5/18
8:10 pm-10:00 pm
1 stop17h 50m
$720
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Fri 5/15
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Mon 5/18
9:30 am-3:25 pm
2 stops21h 55m
$721
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Mon 3/9
5:00 am-12:50 pm
1 stop14h 50m
San Francisco
Mon 3/23
7:25 am-10:30 am
2 stops20h 05m
$722
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sun 4/5
7:00 pm-11:45 am
1 stop24h 45m
San Francisco
Mon 4/20
8:10 pm-3:25 pm
1 stop35h 15m
$726
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Tue 4/14
11:30 am-11:45 am
1 stop32h 15m
San Francisco
Sun 4/26
1:45 pm-3:30 pm
1 stop17h 45m
$726
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 5/13
10:00 pm-5:55 pm
1 stop27h 55m
$352
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sat 5/16
10:05 pm-5:55 pm
1 stop27h 50m
$357
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Mon 6/8
10:00 pm-6:00 pm
1 stop28h 00m
$364
Showing 1-10 of 16 results
- 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 February 11, 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
Overall
6.8
Crew
7.6
Boarding
7.0
Entertainment
6.5
Comfort
6.8
Reviews
1 / 20
4.0
OkayDjermouli,Dec 2025
FRA - SFO
Food
6.3
Overall
6.8
Crew
7.6
Boarding
7.0
Entertainment
6.5
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 locationsSanta Cruz
South San Francisco
Santa Clara
Roseville
Livermore
Watsonville
San Bruno
Daly City
Sunnyvale
Turlock
Vacaville
San Carlos
San Ramon
Redwood City
Rancho Cordova
San Lorenzo
Davis
Hollister
Manteca
Union City
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Porto and San Francisco flights
Browse other Porto and San Francisco flight options. Last updated on February 11, 2026.
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Browse through other flights departing from Porto. Flights are based on user searches made on Cheapflights and were last updated on February 11, 2026.
Popular flight searches
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Explore flights to San Francisco departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 11, 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 February 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$688 | Average$844 | FlexibilityNo cancel fee | On-time76% |