$432+ 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 9/7. Fares are subject to change and may not be available on all flights or dates of travel.
OPO — SFO
Jul 14 — Jul 211
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
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 June 14, 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 June 14, 2026.
This KLM deal was found by Cheapflights users on 6/10. 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.
Wed 9/235:00 am
OPO
- SFO
1 stop14h 45m
KLM
Wed 10/73:05 pm
SFO
- OPO
1 stop22h 55m
KLM
Deal found 6/10![KLM logo]()
$756
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:00 am
OPO
- SFO
1 stop14h 45m
Delta
Wed 10/711:05 am
SFO
- OPO
2 stops20h 20m
Delta
Deal found 6/12![Delta logo]()
$757
This KLM deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/229:55 am
OPO
- SFO
2 stops20h 44m
KLM
Fri 1/19:00 am
SFO
- OPO
1 stop16h 05m
KLM
Deal found 6/12![KLM logo]()
$766
This Air France deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/229:55 am
OPO
- SFO
2 stops20h 44m
Multiple Airlines
Fri 1/17:00 am
SFO
- OPO
1 stop18h 05m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$768
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:10 am
OPO
- SFO
2 stops22h 35m
Delta
Tue 10/68:10 pm
SFO
- OPO
1 stop17h 55m
Delta
Deal found 6/13![Delta logo]()
$771
This Iberia deal was found by Cheapflights users on 6/9. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/712:25 pm
OPO
- SFO
2 stops19h 47m
Iberia
Tue 10/131:59 pm
SFO
- OPO
2 stops18h 01m
Iberia
Deal found 6/9![Iberia logo]()
$773
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/58:20 am
OPO
- SFO
2 stops20h 17m
American Airlines
Mon 11/910:16 am
SFO
- OPO
2 stops17h 29m
American Airlines
Deal found 6/9![American Airlines logo]()
$774
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/238:20 am
OPO
- SFO
2 stops21h 32m
American Airlines
Wed 10/77:04 am
SFO
- OPO
2 stops20h 41m
American Airlines
Deal found 6/9![American Airlines 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 June 14, 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 June 14, 2026.
This KLM deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2611:35 am
OPO
- SFO
1 stop32h 10m
KLM
Tue 10/63:05 pm
SFO
- OPO
1 stop16h 20m
KLM
Deal found 6/12![KLM logo]()
$757
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/255:00 am
OPO
- SFO
1 stop14h 45m
Delta
Tue 10/63:05 pm
SFO
- OPO
1 stop23h 00m
Delta
Deal found 6/12![Delta logo]()
$757
This United Airlines deal was found by Cheapflights users on 6/11. 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 10/86:00 am
OPO
- SFO
1 stop17h 20m
United Airlines
Wed 5/122:40 pm
SFO
- OPO
1 stop17h 00m
United Airlines
Deal found 6/11![United Airlines logo]()
$868
This British Airways deal was found by Cheapflights users on 6/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/78:20 pm
OPO
- SFO
1 stop25h 30m
British Airways
Sat 5/157:30 pm
SFO
- OPO
1 stop17h 10m
British Airways
Deal found 6/11![British Airways logo]()
$928
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:00 am
OPO
- SFO
2 stops19h 57m
Delta
Wed 10/711:05 am
SFO
- OPO
2 stops20h 20m
Delta
Deal found 6/12![Delta logo]()
$763
This KLM deal was found by Cheapflights users on 6/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/95:00 am
OPO
- SFO
1 stop14h 45m
KLM
Thu 7/168:10 pm
SFO
- OPO
1 stop17h 40m
KLM
Deal found 6/11![KLM logo]()
$853
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Tue 10/66:00 am
OPO
- SFO
1 stop17h 20m
United Airlines
Mon 5/102:40 pm
SFO
- OPO
1 stop17h 00m
United Airlines
Deal found 6/11![United Airlines logo]()
$868
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/216:15 am
OPO
- SFO
2 stops22h 36m
Delta
Tue 7/288:10 pm
SFO
- OPO
1 stop17h 55m
Delta
Deal found 6/13![Delta logo]()
$867
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Wed 10/712:00 pm
OPO
- SFO
1 stop32h 40m
United Airlines
Thu 5/132:40 pm
SFO
- OPO
1 stop17h 00m
United Airlines
Deal found 6/11![United Airlines logo]()
$911
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:00 am
OPO
- SFO
2 stops22h 43m
Delta
Mon 8/319:43 am
SFO
- OPO
2 stops21h 47m
Delta
Deal found 6/13![Delta logo]()
$919
This United Airlines deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:00 am
OPO
- SFO
2 stops22h 35m
United Airlines
Fri 8/2811:30 pm
SFO
- OPO
2 stops23h 25m
United Airlines
Deal found 6/13![United Airlines logo]()
$922
Last-minute flights from Porto to San FranciscoDiscover last-minute flight deals from Porto to San Francisco. Data last updated June 14, 2026 and is based on user searches.
Discover last-minute flight deals from Porto to San Francisco. Data last updated June 14, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:00 am
OPO
- SFO
1 stop14h 45m
Delta
Fri 7/35:25 pm
SFO
- OPO
2 stops20h 50m
Delta
Deal found 6/10![Delta logo]()
$859
This Gotogate deal was found by Cheapflights users on 6/10. 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.
Thu 6/185:05 am
OPO
- SFO
1 stop17h 25m
TAP AIR PORTUGAL
Sat 7/47:35 pm
SFO
- OPO
1 stop15h 25m
TAP AIR PORTUGAL
Deal found 6/10![TAP AIR PORTUGAL logo]()
$871
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/205:00 am
OPO
- SFO
1 stop14h 45m
Delta
Sat 7/43:05 pm
SFO
- OPO
1 stop16h 20m
Delta
Deal found 6/13![Delta logo]()
$855
This Delta deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/215:00 am
OPO
- SFO
1 stop14h 45m
Delta
Sun 6/283:26 pm
SFO
- OPO
2 stops18h 44m
Delta
Deal found 6/12![Delta logo]()
$858
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/78:20 am
OPO
- SFO
2 stops19h 45m
American Airlines
Wed 7/152:03 pm
SFO
- OPO
2 stops17h 57m
American Airlines
Deal found 6/11![American Airlines logo]()
$870
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/88:20 am
OPO
- SFO
2 stops19h 45m
American Airlines
Thu 7/305:55 pm
SFO
- OPO
1 stop14h 05m
American Airlines
Deal found 6/11![American Airlines logo]()
$861
This KLM deal was found by Cheapflights users on 6/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/95:00 am
OPO
- SFO
1 stop14h 45m
KLM
Thu 7/168:10 pm
SFO
- OPO
1 stop17h 40m
KLM
Deal found 6/11![KLM logo]()
$853
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1712:25 pm
OPO
- SFO
2 stops20h 34m
American Airlines
Thu 7/305:55 pm
SFO
- OPO
1 stop14h 05m
American Airlines
Deal found 6/9![American Airlines logo]()
$865
This Delta deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/216:15 am
OPO
- SFO
2 stops22h 36m
Delta
Tue 7/288:10 pm
SFO
- OPO
1 stop17h 55m
Delta
Deal found 6/13![Delta logo]()
$867
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 June 14, 2026.
Search for one-way flight options from Porto to San Francisco. Find affordable one-way fares based on user searches. Data last updated June 14, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/11. 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.
Mon 9/78:15 pm
OPO
- SFO
2 stops50h 20m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$432
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/107:40 pm
OPO
- SFO
2 stops28h 25m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$435
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/86:25 am
OPO
- SFO
2 stops40h 20m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$439
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/116:25 pm
OPO
- SFO
2 stops28h 20m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$443
This Kiwi.com deal was found by Cheapflights users on 6/11. 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.
Sun 9/65:55 am
OPO
- SFO
3 stops38h 05m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$458
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/68:40 pm
OPO
- SFO
2 stops26h 05m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$460
This Kiwi.com deal was found by Cheapflights users on 6/11. 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.
Sun 9/135:55 am
OPO
- SFO
2 stops40h 10m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$463
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/73:25 pm
OPO
- SFO
3 stops37h 56m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$466
This Kiwi.com deal was found by Cheapflights users on 6/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/267:40 pm
OPO
- SFO
2 stops28h 25m
Multiple Airlines
Deal found 6/13![Multiple Airlines logo]()
$469
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 9/248:40 pm
OPO
- SFO
3 stops47h 40m
Multiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$470
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 June 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $756 (KLM) |
One-way from | $432 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $1,154 |
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 June 14, 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 9/26
11:35 am-11:45 am
1 stop32h 10m
San Francisco
Tue 10/6
3:05 pm-3:25 pm
1 stop16h 20m
$757
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Fri 9/25
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Tue 10/6
3:05 pm-10:05 pm
1 stop23h 00m
$757
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 9/23
5:00 am-4:57 pm
2 stops19h 57m
San Francisco
Wed 10/7
11:05 am-3:25 pm
2 stops20h 20m
$763
Quickest round-trip
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Thu 7/9
5:00 am-11:45 am
1 stop14h 45m
San Francisco
Thu 7/16
8:10 pm-9:50 pm
1 stop17h 40m
$853
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Tue 7/21
6:15 am-8:51 pm
2 stops22h 36m
San Francisco
Tue 7/28
8:10 pm-10:05 pm
1 stop17h 55m
$867
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Thu 10/8
6:00 am-3:20 pm
1 stop17h 20m
San Francisco
Wed 5/12
2:40 pm-3:40 pm
1 stop17h 00m
$868
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Tue 10/6
6:00 am-3:20 pm
1 stop17h 20m
San Francisco
Mon 5/10
2:40 pm-3:40 pm
1 stop17h 00m
$868
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Wed 10/7
12:00 pm-12:40 pm
1 stop32h 40m
San Francisco
Thu 5/13
2:40 pm-3:40 pm
1 stop17h 00m
$911
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sat 8/22
5:00 am-7:43 pm
2 stops22h 43m
San Francisco
Mon 8/31
9:43 am-3:30 pm
2 stops21h 47m
$919
PortoSan Francisco
OPO - SFO
OPOSFO
Porto
Sat 8/22
9:00 am-11:35 pm
2 stops22h 35m
San Francisco
Fri 8/28
11:30 pm-6:55 am
2 stops23h 25m
$922
Showing 1-10 of 23 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
What is the cheapest month to book a flight from Porto to San Francisco?
Currently, January is the cheapest month in which you can book a flight from Porto to San Francisco (average of $692). Flying from Porto to San Francisco in June is currently the most expensive (average of $1,154). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Porto to San Francisco?
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 June 14, 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.
Boarding
7.0
Comfort
6.8
Overall
6.8
Entertainment
6.4
Crew
7.6
Food
6.3
Reviews
1 / 20
4.0
OkayDjermouli,Dec 2025
FRA - SFO
Boarding
7.0
Comfort
6.8
Overall
6.8
Entertainment
6.4
Crew
7.6
Food
6.3
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 Cruz
Santa Clara
Fairfield
Rancho Cordova
Roseville
Cupertino
Emeryville
Newark
San Bruno
Watsonville
San Ramon
Vacaville
San Carlos
Redwood City
Daly City
Sunnyvale
Turlock
Vallejo
San Lorenzo
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Porto
Popular flights
San Francisco flight routes
Alternative routes for Porto to San Francisco
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Francisco by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Porto to San Francisco by cabin class
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 June 14, 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 June 14, 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 June 14, 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 June 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$688 | Average$844 | FlexibilityNo cancel fee | On-time76% |