$358+ Cheap flights from San Francisco (SFO) to Porto (OPO)
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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — OPO
Jun 19 — Jun 261
Round-trip
1 adult, Economy
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Find cheap flights from San Francisco to Porto 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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One-way
Cheapest flights from San Francisco to PortoExplore the most affordable flight options available from San Francisco to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 20, 2026.
Explore the most affordable flight options available from San Francisco to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 20, 2026.
This Justfly.com deal was found by Cheapflights users on 5/15. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/124:45 pm
SFO
- OPO
1 stop34h 25m
Scandinavian Airlines
Wed 2/1011:55 am
OPO
- SFO
1 stop34h 55m
Scandinavian Airlines
Deal found 5/15![Scandinavian Airlines logo]()
$646
This Scandinavian Airlines deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/94:45 pm
SFO
- OPO
1 stop34h 20m
Scandinavian Airlines
Wed 2/1011:55 am
OPO
- SFO
1 stop34h 55m
Scandinavian Airlines
Deal found 5/15![Scandinavian Airlines logo]()
$669
This KAYAK deal was found by Cheapflights users on 5/15. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/104:15 pm
SFO
- OPO
2 stops40h 45m
Scandinavian Airlines
Wed 2/1011:55 am
OPO
- SFO
1 stop34h 55m
Scandinavian Airlines
Deal found 5/15![Scandinavian Airlines logo]()
$723
This KAYAK deal was found by Cheapflights users on 5/15. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/144:45 pm
SFO
- OPO
1 stop34h 20m
Scandinavian Airlines
Wed 2/1011:55 am
OPO
- SFO
1 stop34h 55m
Scandinavian Airlines
Deal found 5/15![Scandinavian Airlines logo]()
$739
This KAYAK deal was found by Cheapflights users on 5/15. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/94:45 pm
SFO
- OPO
1 stop34h 20m
Scandinavian Airlines
Mon 2/811:55 am
OPO
- SFO
2 stops43h 06m
Scandinavian Airlines
Deal found 5/15![Scandinavian Airlines logo]()
$759
This Travelocity deal was found by Cheapflights users on 5/15. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/115:30 pm
SFO
- OPO
1 stop16h 20m
Multiple Airlines
Wed 2/108:40 pm
OPO
- SFO
2 stops36h 03m
Multiple Airlines
Deal found 5/15![Multiple Airlines logo]()
$761
This Travelocity deal was found by Cheapflights users on 5/15. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/112:06 pm
SFO
- OPO
2 stops19h 44m
British Airways
Wed 2/1012:25 pm
OPO
- SFO
2 stops20h 18m
British Airways
Deal found 5/15![British Airways logo]()
$765
This oojo deal was found by Cheapflights users on 5/18. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/154:45 pm
SFO
- OPO
1 stop16h 20m
Scandinavian Airlines
Sat 11/712:00 pm
OPO
- SFO
1 stop34h 50m
Scandinavian Airlines
Deal found 5/18![Scandinavian Airlines logo]()
$777
This FlightHub deal was found by Cheapflights users on 5/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/174:45 pm
SFO
- OPO
1 stop34h 15m
Scandinavian Airlines
Thu 8/2711:50 am
OPO
- SFO
1 stop34h 50m
Scandinavian Airlines
Deal found 5/19![Scandinavian Airlines logo]()
$786
This Gotogate deal was found by Cheapflights users on 5/19. 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 11/88:30 am
SFO
- OPO
2 stops26h 00m
Multiple Airlines
Fri 11/206:15 am
OPO
- SFO
1 stop21h 20m
Multiple Airlines
Deal found 5/19![Multiple Airlines logo]()
$792
Best flights from San Francisco to PortoDiscover carefully curated flight deals from San Francisco to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 20, 2026.
Discover carefully curated flight deals from San Francisco to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 20, 2026.
This KLM deal was found by Cheapflights users on 5/20. 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 9/228:10 pm
SFO
- OPO
1 stop17h 55m
KLM
Tue 9/294:20 pm
OPO
- SFO
1 stop27h 25m
KLM
Deal found 5/20![KLM logo]()
$837
This United Airlines deal was found by Cheapflights users on 5/16. 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 8/89:15 pm
SFO
- OPO
1 stop28h 30m
United Airlines
Thu 8/2711:50 am
OPO
- SFO
1 stop31h 31m
United Airlines
Deal found 5/16![United Airlines logo]()
$837
This Delta deal was found by Cheapflights users on 5/16. 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 8/51:10 pm
SFO
- OPO
2 stops24h 50m
Delta
Thu 8/275:00 am
OPO
- SFO
1 stop14h 45m
Delta
Deal found 5/16![Delta logo]()
$842
This British Airways deal was found by Cheapflights users on 5/19. 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.
Mon 10/53:50 pm
SFO
- OPO
2 stops20h 15m
British Airways
Mon 10/129:25 pm
OPO
- SFO
1 stop24h 25m
British Airways
Deal found 5/19![British Airways logo]()
$884
This Turkish Airlines deal was found by Cheapflights users on 5/19. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:45 pm
SFO
- OPO
1 stop31h 00m
Turkish Airlines
Sat 10/3110:55 am
OPO
- SFO
1 stop38h 50m
Turkish Airlines
Deal found 5/19![Turkish Airlines logo]()
$925
This United Airlines deal was found by Cheapflights users on 5/18. 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 8/411:59 pm
SFO
- OPO
1 stop25h 46m
United Airlines
Tue 8/1112:15 pm
OPO
- SFO
1 stop31h 06m
United Airlines
Deal found 5/18![United Airlines logo]()
$902
This Delta deal was found by Cheapflights users on 5/17. 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 8/2011:30 am
SFO
- OPO
2 stops19h 55m
Delta
Thu 9/311:35 am
OPO
- SFO
1 stop32h 10m
Delta
Deal found 5/17![Delta logo]()
$902
This KLM deal was found by Cheapflights users on 5/18. 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 8/2210:35 pm
SFO
- OPO
1 stop27h 50m
KLM
Wed 9/95:00 am
OPO
- SFO
1 stop14h 45m
KLM
Deal found 5/18![KLM logo]()
$916
This Delta deal was found by Cheapflights users on 5/17. 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 8/212:21 pm
SFO
- OPO
2 stops17h 09m
Delta
Fri 9/45:00 am
OPO
- SFO
2 stops19h 03m
Delta
Deal found 5/17![Delta logo]()
$917
This Delta deal was found by Cheapflights users on 5/17. 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 8/2411:35 pm
SFO
- OPO
2 stops26h 55m
Delta
Fri 9/45:55 am
OPO
- SFO
2 stops20h 13m
Delta
Deal found 5/17![Delta logo]()
$924
This Delta deal was found by Cheapflights users on 5/19. 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 8/138:55 am
SFO
- OPO
1 stop17h 35m
Delta
Mon 8/1711:25 am
OPO
- SFO
1 stop32h 20m
Delta
Deal found 5/19![Delta logo]()
$962
Last-minute flights from San Francisco to PortoDiscover last-minute flight deals from San Francisco to Porto. Data last updated May 20, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Porto. Data last updated May 20, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 5/301:00 pm
SFO
- OPO
2 stops19h 10m
Multiple Airlines
Thu 6/116:00 am
OPO
- SFO
1 stop15h 50m
Multiple Airlines
Deal found 5/16![Multiple Airlines logo]()
$1,066
This Mytrip deal was found by Cheapflights users on 5/18. 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 6/12:40 pm
SFO
- OPO
3 stops33h 20m
Multiple Airlines
Thu 6/1110:00 pm
OPO
- SFO
2 stops23h 35m
Multiple Airlines
Deal found 5/18![Multiple Airlines logo]()
$1,057
This Mytrip deal was found by Cheapflights users on 5/19. 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.
Wed 6/38:30 am
SFO
- OPO
2 stops28h 50m
Multiple Airlines
Tue 6/99:30 pm
OPO
- SFO
2 stops25h 05m
Multiple Airlines
Deal found 5/19![Multiple Airlines logo]()
$1,008
This Mytrip deal was found by Cheapflights users on 5/19. 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 6/94:30 pm
SFO
- OPO
3 stops31h 40m
Multiple Airlines
Tue 6/166:35 pm
OPO
- SFO
2 stops27h 55m
Multiple Airlines
Deal found 5/19![Multiple Airlines logo]()
$1,040
This United Airlines deal was found by Cheapflights users on 5/15. 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 6/1311:30 pm
SFO
- OPO
2 stops23h 25m
United Airlines
Fri 7/39:00 am
OPO
- SFO
2 stops23h 32m
United Airlines
Deal found 5/15![United Airlines logo]()
$1,045
This United Airlines deal was found by Cheapflights users on 5/16. 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 6/1511:59 pm
SFO
- OPO
2 stops22h 16m
United Airlines
Mon 6/2212:10 pm
OPO
- SFO
1 stop35h 05m
United Airlines
Deal found 5/16![United Airlines logo]()
$1,050
This Justfly.com deal was found by Cheapflights users on 5/17. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1612:15 pm
SFO
- OPO
2 stops34h 45m
Multiple Airlines
Tue 6/2312:15 pm
OPO
- SFO
1 stop36h 00m
Multiple Airlines
Deal found 5/17![Multiple Airlines logo]()
$1,023
This Air Canada deal was found by Cheapflights users on 5/19. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/2711:10 am
SFO
- OPO
1 stop35h 40m
Air Canada
Tue 7/712:15 pm
OPO
- SFO
2 stops18h 52m
Air Canada
Deal found 5/19![Air Canada logo]()
$1,033
This United Airlines deal was found by Cheapflights users on 5/16. 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 6/3011:10 am
SFO
- OPO
1 stop35h 50m
United Airlines
Tue 7/712:15 pm
OPO
- SFO
2 stops31h 59m
United Airlines
Deal found 5/16![United Airlines logo]()
$1,020
One-way flights from San Francisco to PortoSearch for one-way flight options from San Francisco to Porto. Find affordable one-way fares based on user searches. Data last updated May 20, 2026.
Search for one-way flight options from San Francisco to Porto. Find affordable one-way fares based on user searches. Data last updated May 20, 2026.
This Orbitz deal was found by Cheapflights users on 5/17. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:30 pm
SFO
- OPO
2 stops28h 10m
Iberia
Deal found 5/17![Iberia logo]()
$358
This American Airlines deal was found by Cheapflights users on 5/18. 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 10/2112:22 pm
SFO
- OPO
2 stops19h 38m
American Airlines
Deal found 5/18![American Airlines logo]()
$359
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 10/229:00 am
SFO
- OPO
3 stops27h 25m
Multiple Airlines
Deal found 5/18![Multiple Airlines logo]()
$374
This American Airlines deal was found by Cheapflights users on 5/16. 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.
Sun 9/2712:22 pm
SFO
- OPO
2 stops19h 38m
American Airlines
Deal found 5/16![American Airlines logo]()
$376
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 10/115:40 pm
SFO
- OPO
2 stops29h 30m
Multiple Airlines
Deal found 5/16![Multiple Airlines logo]()
$381
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 10/247:40 am
SFO
- OPO
3 stops26h 50m
Multiple Airlines
Deal found 5/18![Multiple Airlines logo]()
$385
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 10/185:40 pm
SFO
- OPO
2 stops30h 20m
Multiple Airlines
Deal found 5/18![Multiple Airlines logo]()
$387
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 10/195:35 pm
SFO
- OPO
2 stops30h 25m
Multiple Airlines
Deal found 5/18![Multiple Airlines logo]()
$388
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 10/157:40 am
SFO
- OPO
3 stops28h 45m
Multiple Airlines
Deal found 5/16![Multiple Airlines logo]()
$394
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 10/2011:30 am
SFO
- OPO
2 stops22h 20m
Multiple Airlines
Deal found 5/18![Multiple Airlines logo]()
$395
This Kiwi.com deal was found by Cheapflights users on 5/17. 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 9/69:05 pm
SFO
- OPO
2 stops40h 45m
Multiple Airlines
Deal found 5/17![Multiple Airlines logo]()
$403
Find flight deals from San Francisco to Porto
Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Porto (OPO). 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 May 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $646 (Justfly.com) |
One-way from | $358 (Orbitz) |
Popular in | June |
Cheapest in | February |
Average price | $895 |
Cheapflights Fare Finder
Customize your flight search to find flights from San Francisco to Porto 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 May 20, 2026.
Use the filters below to find and compare flights from San Francisco to Porto that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Tue 9/22
8:10 pm-10:05 pm
1 stop17h 55m
Porto
Tue 9/29
4:20 pm-11:45 am
1 stop27h 25m
$837
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Sat 8/8
9:15 pm-9:45 am
1 stop28h 30m
Porto
Thu 8/27
11:50 am-11:21 am
1 stop31h 31m
$837
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Wed 8/5
1:10 pm-10:00 pm
2 stops24h 50m
Porto
Thu 8/27
5:00 am-11:45 am
1 stop14h 45m
$842
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Mon 10/5
3:50 pm-8:05 pm
2 stops20h 15m
Porto
Mon 10/12
9:25 pm-1:50 pm
1 stop24h 25m
$884
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Tue 8/4
11:59 pm-9:45 am
1 stop25h 46m
Porto
Tue 8/11
12:15 pm-11:21 am
1 stop31h 06m
$902
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Thu 8/20
11:30 am-3:25 pm
2 stops19h 55m
Porto
Thu 9/3
11:35 am-11:45 am
1 stop32h 10m
$902
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Sat 8/22
10:35 pm-10:25 am
1 stop27h 50m
Porto
Wed 9/9
5:00 am-11:45 am
1 stop14h 45m
$916
Quickest round-trip
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Fri 8/21
2:21 pm-3:30 pm
2 stops17h 09m
Porto
Fri 9/4
5:00 am-4:03 pm
2 stops19h 03m
$917
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Mon 8/24
11:35 pm-10:30 am
2 stops26h 55m
Porto
Fri 9/4
5:55 am-6:08 pm
2 stops20h 13m
$924
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Thu 10/8
6:45 pm-9:45 am
1 stop31h 00m
Porto
Sat 10/31
10:55 am-6:45 pm
1 stop38h 50m
$925
Showing 1-10 of 19 resultsSorted by cheapest first
Compare providers for flights from San Francisco to Porto
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Francisco to Porto in May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on San Francisco-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Francisco-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Francisco-Porto flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on San Francisco-Porto 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 San Francisco-Porto 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 San Francisco to Porto
Have a flexible travel schedule? Discover the best time to fly to Porto from San Francisco with our price prediction graph.
SFO-OPO
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 San Francisco to Porto
How far ahead should I book a flight from San Francisco to Porto?
To ensure you get the cheapest price possible for a flight from San Francisco to Porto, you should look to book at least 82 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from San Francisco to Porto?
Currently, February is the cheapest month in which you can book a flight from San Francisco to Porto (average of $578). Flying from San Francisco to Porto in June is currently the most expensive (average of $1,233). 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 San Francisco to Porto?
Reviews of airlines servicing Porto
Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated May 20, 2026.
Read reviews from past customers who have flown Delta,SWISS, andUnited Airlines from San Francisco to Porto. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Related info for your journey
Find useful and relevant information for your journey from San Francisco to Porto. 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 Porto?
Book flights to Porto if you plan to visit one of these locationsVila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra
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San Francisco and Porto flights
Browse other San Francisco and Porto flight options. Last updated on May 20, 2026.
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Top 10 airlines flying from San Francisco to Porto
Discover the top 10 airlines that operate flights from San Francisco to Porto. 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 May 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$431 | Average$725 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$480 | Average$612 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$625 | Average$999 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$643 | Average$931 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$654 | Average$789 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$660 | Average$1,116 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$675 | Average$1,067 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$683 | Average$929 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$778 | Average$1,105 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$787 | Average$1,103 | FlexibilityNo cancel fee | On-time67% |