$419+ 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 5/14. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SFO
May 29 — Jun 51
Round-trip
1 adult, Economy
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Find cheap flights from Porto to San Francisco with Cheapflights
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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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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 April 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 April 29, 2026.
This ResecentrumGruppen deal was found by Cheapflights users on 4/24. 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 ResecentrumGruppen is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:00 am
OPO
- SFO
1 stop14h 45m
KLM
Thu 5/143:05 pm
SFO
- OPO
1 stop22h 55m
KLM
Deal found 4/24![KLM logo]()
$750
This Flysmarter deal was found by Cheapflights users on 4/29. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/811:25 am
OPO
- SFO
1 stop32h 20m
KLM
Thu 5/143:05 pm
SFO
- OPO
1 stop22h 55m
KLM
Deal found 4/29![KLM logo]()
$796
This KLM deal was found by Cheapflights users on 4/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1111:25 am
OPO
- SFO
1 stop32h 20m
KLM
Wed 5/278:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 4/29![KLM logo]()
$797
This KLM deal was found by Cheapflights users on 4/28. 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.
Fri 5/155:00 am
OPO
- SFO
1 stop14h 45m
KLM
Mon 5/188:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 4/28![KLM logo]()
$798
This Air France deal was found by Cheapflights users on 4/28. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1411:25 am
OPO
- SFO
1 stop32h 20m
Multiple Airlines
Wed 5/278:10 pm
SFO
- OPO
1 stop17h 50m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$799
This Delta deal was found by Cheapflights users on 4/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:00 am
OPO
- SFO
2 stops22h 20m
Delta
Thu 5/148:10 pm
SFO
- OPO
1 stop17h 50m
Delta
Deal found 4/24![Delta logo]()
$802
This Delta deal was found by Cheapflights users on 4/29. 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.
Mon 5/115:00 am
OPO
- SFO
1 stop14h 45m
Delta
Wed 5/274:55 pm
SFO
- OPO
2 stops21h 20m
Delta
Deal found 4/29![Delta logo]()
$803
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:00 am
OPO
- SFO
1 stop14h 45m
Delta
Thu 5/289:43 am
SFO
- OPO
2 stops21h 47m
Delta
Deal found 4/28![Delta logo]()
$804
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:00 am
OPO
- SFO
2 stops18h 58m
Delta
Wed 5/274:55 pm
SFO
- OPO
2 stops21h 20m
Delta
Deal found 4/28![Delta logo]()
$809
This Delta deal was found by Cheapflights users on 4/27. 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 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 stops22h 20m
Delta
Mon 5/183:05 pm
SFO
- OPO
1 stop22h 55m
Delta
Deal found 4/27![Delta logo]()
$833
This Gotogate deal was found by Cheapflights users on 4/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
OPO
- SFO
1 stop17h 25m
Lufthansa
Tue 5/199:05 pm
SFO
- OPO
1 stop18h 20m
Lufthansa
Deal found 4/24![Lufthansa logo]()
$845
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 April 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 April 29, 2026.
This Delta deal was found by Cheapflights users on 4/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/165:00 am
OPO
- SFO
2 stops20h 49m
Delta
Mon 6/111:00 pm
SFO
- OPO
1 stop15h 00m
Delta
Deal found 4/26![Delta logo]()
$803
This Lufthansa deal was found by Cheapflights users on 4/24. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
OPO
- SFO
1 stop17h 15m
Lufthansa
Sun 5/317:00 am
SFO
- OPO
1 stop18h 45m
Lufthansa
Deal found 4/24![Lufthansa logo]()
$849
This KLM deal was found by Cheapflights users on 4/25. 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 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 5/188:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 4/25![KLM logo]()
$859
This Delta deal was found by Cheapflights users on 4/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:00 am
OPO
- SFO
2 stops22h 20m
Delta
Tue 6/28:10 pm
SFO
- OPO
1 stop17h 55m
Delta
Deal found 4/26![Delta logo]()
$804
This KLM deal was found by Cheapflights users on 4/27. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/117:10 pm
OPO
- SFO
1 stop24h 35m
KLM
Sat 7/48:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 4/27![KLM logo]()
$861
This Delta deal was found by Cheapflights users on 4/25. 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.
Wed 9/235:00 am
OPO
- SFO
1 stop14h 45m
Delta
Wed 10/711:30 am
SFO
- OPO
2 stops19h 55m
Delta
Deal found 4/25![Delta logo]()
$856
This Delta deal was found by Cheapflights users on 4/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:55 am
OPO
- SFO
1 stop20h 05m
Delta
Tue 10/63:05 pm
SFO
- OPO
1 stop16h 20m
Delta
Deal found 4/24![Delta logo]()
$861
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/115:00 am
OPO
- SFO
2 stops21h 30m
Delta
Sat 7/48:10 pm
SFO
- OPO
1 stop17h 50m
Delta
Deal found 4/27![Delta logo]()
$868
Last-minute flights from Porto to San FranciscoDiscover last-minute flight deals from Porto to San Francisco. Data last updated April 29, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to San Francisco. Data last updated April 29, 2026 and is based on user searches.
This ResecentrumGruppen deal was found by Cheapflights users on 4/24. 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 ResecentrumGruppen is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:00 am
OPO
- SFO
1 stop14h 45m
KLM
Thu 5/143:05 pm
SFO
- OPO
1 stop22h 55m
KLM
Deal found 4/24![KLM logo]()
$750
This Delta deal was found by Cheapflights users on 4/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:00 am
OPO
- SFO
2 stops22h 20m
Delta
Thu 5/148:10 pm
SFO
- OPO
1 stop17h 50m
Delta
Deal found 4/24![Delta logo]()
$802
This Flysmarter deal was found by Cheapflights users on 4/29. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/811:25 am
OPO
- SFO
1 stop32h 20m
KLM
Thu 5/143:05 pm
SFO
- OPO
1 stop22h 55m
KLM
Deal found 4/29![KLM logo]()
$796
This KLM deal was found by Cheapflights users on 4/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1111:25 am
OPO
- SFO
1 stop32h 20m
KLM
Wed 5/278:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 4/29![KLM logo]()
$797
This Delta deal was found by Cheapflights users on 4/29. 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.
Mon 5/115:00 am
OPO
- SFO
1 stop14h 45m
Delta
Wed 5/274:55 pm
SFO
- OPO
2 stops21h 20m
Delta
Deal found 4/29![Delta logo]()
$803
This Gotogate deal was found by Cheapflights users on 4/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
OPO
- SFO
1 stop17h 25m
Lufthansa
Tue 5/199:05 pm
SFO
- OPO
1 stop18h 20m
Lufthansa
Deal found 4/24![Lufthansa logo]()
$845
This Air France deal was found by Cheapflights users on 4/28. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/1411:25 am
OPO
- SFO
1 stop32h 20m
Multiple Airlines
Wed 5/278:10 pm
SFO
- OPO
1 stop17h 50m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$799
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:00 am
OPO
- SFO
1 stop14h 45m
Delta
Thu 5/289:43 am
SFO
- OPO
2 stops21h 47m
Delta
Deal found 4/28![Delta logo]()
$804
This Delta deal was found by Cheapflights users on 4/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/145:00 am
OPO
- SFO
2 stops18h 58m
Delta
Wed 5/274:55 pm
SFO
- OPO
2 stops21h 20m
Delta
Deal found 4/28![Delta logo]()
$809
This KLM deal was found by Cheapflights users on 4/28. 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.
Fri 5/155:00 am
OPO
- SFO
1 stop14h 45m
KLM
Mon 5/188:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Deal found 4/28![KLM logo]()
$798
This Delta deal was found by Cheapflights users on 4/27. 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 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 stops22h 20m
Delta
Mon 5/183:05 pm
SFO
- OPO
1 stop22h 55m
Delta
Deal found 4/27![Delta logo]()
$833
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 April 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 April 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Thu 5/147:15 am
OPO
- SFO
2 stops41h 35m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$419
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Tue 5/126:35 pm
OPO
- SFO
2 stops54h 00m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$421
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 5/1810:25 pm
OPO
- SFO
3 stops45h 35m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$425
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Tue 5/59:30 pm
OPO
- SFO
2 stops51h 05m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$427
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Wed 5/132:40 pm
OPO
- SFO
2 stops33h 55m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$428
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Tue 5/1910:25 pm
OPO
- SFO
2 stops31h 30m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$429
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Wed 5/202:40 pm
OPO
- SFO
2 stops33h 55m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$430
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Thu 5/217:00 am
OPO
- SFO
2 stops41h 50m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$434
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/37:15 am
OPO
- SFO
2 stops41h 20m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$440
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Fri 5/159:45 pm
OPO
- SFO
3 stops46h 15m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$441
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Sat 5/169:50 pm
OPO
- SFO
3 stops50h 50m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$443
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 April 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $797 (KLM) |
One-way from | $419 (Kiwi.com) |
Popular in | May |
Cheapest in | January |
Average price | $738 |
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 April 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
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sat 5/16
5:00 am-5:49 pm
2 stops20h 49m
San Francisco
Mon 6/1
11:00 pm-10:00 pm
1 stop15h 00m
$803
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Tue 5/26
5:00 am-7:20 pm
2 stops22h 20m
San Francisco
Tue 6/2
8:10 pm-10:05 pm
1 stop17h 55m
$804
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sun 5/24
6:00 am-3:15 pm
1 stop17h 15m
San Francisco
Sun 5/31
7:00 am-9:45 am
1 stop18h 45m
$849
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 9/23
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Wed 10/7
11:30 am-3:25 pm
2 stops19h 55m
$856
Quickest 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
8:10 pm-10:00 pm
1 stop17h 50m
$859
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Thu 6/11
7:10 pm-11:45 am
1 stop24h 35m
San Francisco
Sat 7/4
8:10 pm-10:00 pm
1 stop17h 50m
$861
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Fri 10/2
5:55 am-6:00 pm
1 stop20h 05m
San Francisco
Tue 10/6
3:05 pm-3:25 pm
1 stop16h 20m
$861
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Thu 6/11
5:00 am-6:30 pm
2 stops21h 30m
San Francisco
Sat 7/4
8:10 pm-10:00 pm
1 stop17h 50m
$868
Cheapest one-way
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Thu 10/15
7:00 am-9:55 pm
3 stops22h 55m
$547
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sat 10/3
12:25 pm-8:55 am
2 stops28h 30m
$549
Showing 1-10 of 19 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.
Cheapflights Insights
Everything you need to know about your flight from Porto to San Francisco
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 April 29, 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.
Comfort
6.8
Crew
7.6
Food
6.3
Boarding
7.0
Entertainment
6.4
Overall
6.8
Reviews
1 / 20
4.0
OkayDjermouli,Dec 2025
FRA - SFO
Comfort
6.8
Crew
7.6
Food
6.3
Boarding
7.0
Entertainment
6.4
Overall
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?
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Watsonville
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Emeryville
Vacaville
Roseville
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Davis
Manteca
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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 April 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$688 | Average$844 | FlexibilityNo cancel fee | On-time76% |