$343+ 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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — OPO
May 5 — May 121
Round-trip
1 adult, Economy
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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 April 5, 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 April 5, 2026.
This FlightHub deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:45 pm
SFO
- OPO
1 stop20h 45m
Turkish Airlines
Tue 5/1210:40 am
OPO
- SFO
1 stop38h 00m
Turkish Airlines
Deal found 4/5![Turkish Airlines logo]()
$644
This FlightHub deal was found by Cheapflights users on 4/1. 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.
Tue 9/812:55 pm
SFO
- OPO
1 stop26h 35m
Turkish Airlines
Wed 9/1610:45 am
OPO
- SFO
1 stop37h 55m
Turkish Airlines
Deal found 4/1![Turkish Airlines logo]()
$669
This FlightHub deal was found by Cheapflights users on 4/4. 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.
Tue 9/812:55 pm
SFO
- OPO
1 stop18h 45m
Turkish Airlines
Wed 9/234:40 pm
OPO
- SFO
1 stop26h 10m
Turkish Airlines
Deal found 4/4![Turkish Airlines logo]()
$671
This oojo deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:55 pm
SFO
- OPO
1 stop18h 55m
Turkish Airlines
Wed 4/294:40 pm
OPO
- SFO
1 stop32h 00m
Turkish Airlines
Deal found 4/5![Turkish Airlines logo]()
$676
This FlightHub deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:45 pm
SFO
- OPO
1 stop37h 05m
Turkish Airlines
Tue 9/1510:40 am
OPO
- SFO
1 stop38h 00m
Turkish Airlines
Deal found 4/5![Turkish Airlines logo]()
$678
This FlightHub deal was found by Cheapflights users on 4/2. 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 9/216:45 pm
SFO
- OPO
1 stop36h 55m
Turkish Airlines
Tue 9/2910:40 am
OPO
- SFO
1 stop38h 00m
Turkish Airlines
Deal found 4/2![Turkish Airlines logo]()
$680
This FlightHub deal was found by Cheapflights users on 3/31. 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.
Wed 4/226:45 pm
SFO
- OPO
1 stop30h 55m
Turkish Airlines
Mon 5/46:30 am
OPO
- SFO
1 stop36h 20m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$681
This FlightHub deal was found by Cheapflights users on 4/3. 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.
Wed 4/226:45 pm
SFO
- OPO
1 stop30h 55m
Turkish Airlines
Sun 5/310:45 am
OPO
- SFO
1 stop32h 05m
Turkish Airlines
Deal found 4/3![Turkish Airlines logo]()
$700
This Turkish Airlines deal was found by Cheapflights users on 4/2. 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.
Tue 8/46:45 pm
SFO
- OPO
1 stop20h 45m
Turkish Airlines
Thu 9/34:40 pm
OPO
- SFO
1 stop32h 00m
Turkish Airlines
Deal found 4/2![Turkish Airlines logo]()
$702
This oojo deal was found by Cheapflights users on 4/3. 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.
Wed 4/296:45 pm
SFO
- OPO
1 stop30h 55m
Turkish Airlines
Mon 5/116:30 am
OPO
- SFO
1 stop36h 20m
Turkish Airlines
Deal found 4/3![Turkish Airlines logo]()
$715
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 April 5, 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 April 5, 2026.
This FlightHub deal was found by Cheapflights users on 3/31. 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.
Sun 4/266:45 pm
SFO
- OPO
1 stop37h 05m
Turkish Airlines
Tue 5/510:40 am
OPO
- SFO
1 stop38h 00m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$681
This United Airlines deal was found by Cheapflights users on 3/31. 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.
Sun 4/2611:20 pm
SFO
- OPO
2 stops26h 25m
United Airlines
Tue 5/56:00 am
OPO
- SFO
2 stops21h 30m
United Airlines
Deal found 3/31![United Airlines logo]()
$906
This Delta deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/911:56 am
SFO
- OPO
2 stops19h 29m
Delta
Sat 5/165:00 am
OPO
- SFO
1 stop14h 45m
Delta
Deal found 4/5![Delta logo]()
$934
This KLM deal was found by Cheapflights users on 4/3. 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 7/193:05 pm
SFO
- OPO
1 stop16h 25m
KLM
Wed 8/512:40 pm
OPO
- SFO
1 stop17h 58m
KLM
Deal found 4/3![KLM logo]()
$947
This United Airlines deal was found by Cheapflights users on 4/3. 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.
Sun 7/1911:10 am
SFO
- OPO
1 stop35h 50m
United Airlines
Wed 8/52:25 pm
OPO
- SFO
2 stops35h 05m
United Airlines
Deal found 4/3![United Airlines logo]()
$926
This Delta deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/611:35 am
SFO
- OPO
2 stops19h 55m
Delta
Tue 9/155:00 am
OPO
- SFO
2 stops19h 03m
Delta
Deal found 4/5![Delta logo]()
$944
This KLM deal was found by Cheapflights users on 4/1. 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 6/18:10 pm
SFO
- OPO
1 stop17h 50m
KLM
Tue 6/95:00 am
OPO
- SFO
1 stop14h 45m
KLM
Deal found 4/1![KLM logo]()
$1,022
This Delta deal was found by Cheapflights users on 4/1. 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 5/161:35 pm
SFO
- OPO
2 stops20h 35m
Delta
Sat 5/235:55 am
OPO
- SFO
1 stop14h 55m
Delta
Deal found 4/1![Delta logo]()
$973
This Delta deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/292:57 pm
SFO
- OPO
2 stops23h 03m
Delta
Mon 5/115:00 am
OPO
- SFO
2 stops20h 49m
Delta
Deal found 4/5![Delta logo]()
$987
This Delta deal was found by Cheapflights users on 4/1. 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 6/111:55 am
SFO
- OPO
2 stops19h 30m
Delta
Tue 6/95:00 am
OPO
- SFO
1 stop14h 45m
Delta
Deal found 4/1![Delta logo]()
$1,027
Last-minute flights from San Francisco to PortoDiscover last-minute flight deals from San Francisco to Porto. Data last updated April 5, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco to Porto. Data last updated April 5, 2026 and is based on user searches.
This FlightHub deal was found by Cheapflights users on 4/2. 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.
Sat 4/116:45 pm
SFO
- OPO
1 stop37h 05m
Turkish Airlines
Sun 4/194:40 pm
OPO
- SFO
1 stop26h 10m
Turkish Airlines
Deal found 4/2![Turkish Airlines logo]()
$737
This oojo deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:55 pm
SFO
- OPO
1 stop18h 55m
Turkish Airlines
Wed 4/294:40 pm
OPO
- SFO
1 stop32h 00m
Turkish Airlines
Deal found 4/5![Turkish Airlines logo]()
$676
This FlightHub deal was found by Cheapflights users on 3/31. 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.
Wed 4/226:45 pm
SFO
- OPO
1 stop30h 55m
Turkish Airlines
Mon 5/46:30 am
OPO
- SFO
1 stop36h 20m
Turkish Airlines
Deal found 3/31![Turkish Airlines logo]()
$681
This FlightHub deal was found by Cheapflights users on 4/3. 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.
Wed 4/226:45 pm
SFO
- OPO
1 stop30h 55m
Turkish Airlines
Sun 5/310:45 am
OPO
- SFO
1 stop32h 05m
Turkish Airlines
Deal found 4/3![Turkish Airlines logo]()
$700
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 4/226:45 pm
SFO
- OPO
1 stop30h 55m
Turkish Airlines
Mon 4/2710:40 am
OPO
- SFO
1 stop32h 10m
Turkish Airlines
Deal found 4/1![Turkish Airlines logo]()
$741
This oojo deal was found by Cheapflights users on 4/3. 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.
Wed 4/296:45 pm
SFO
- OPO
1 stop30h 55m
Turkish Airlines
Mon 5/116:30 am
OPO
- SFO
1 stop36h 20m
Turkish Airlines
Deal found 4/3![Turkish Airlines logo]()
$715
This oojo deal was found by Cheapflights users on 4/3. 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.
Fri 5/112:55 pm
SFO
- OPO
1 stop36h 50m
Turkish Airlines
Tue 5/1210:40 am
OPO
- SFO
1 stop38h 00m
Turkish Airlines
Deal found 4/3![Turkish Airlines logo]()
$716
This FlightHub deal was found by Cheapflights users on 4/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:45 pm
SFO
- OPO
1 stop20h 45m
Turkish Airlines
Tue 5/1210:40 am
OPO
- SFO
1 stop38h 00m
Turkish Airlines
Deal found 4/5![Turkish Airlines logo]()
$644
This oojo deal was found by Cheapflights users on 4/2. 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.
Mon 5/1112:55 pm
SFO
- OPO
1 stop36h 50m
Turkish Airlines
Sun 5/244:40 pm
OPO
- SFO
1 stop26h 10m
Turkish Airlines
Deal found 4/2![Turkish Airlines logo]()
$735
This FlightHub deal was found by Cheapflights users on 4/1. 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.
Tue 5/126:45 pm
SFO
- OPO
1 stop20h 45m
Turkish Airlines
Tue 5/264:50 pm
OPO
- SFO
1 stop31h 50m
Turkish Airlines
Deal found 4/1![Turkish Airlines logo]()
$747
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 April 5, 2026.
Search for one-way flight options from San Francisco to Porto. Find affordable one-way fares based on user searches. Data last updated April 5, 2026.
This Iberia deal was found by Cheapflights users on 4/3. 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.
Tue 4/147:40 pm
SFO
- OPO
1 stop28h 20m
Iberia
Deal found 4/3![Iberia logo]()
$343
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 8/195:40 pm
SFO
- OPO
2 stops29h 15m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$364
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 8/175:35 pm
SFO
- OPO
2 stops29h 15m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$366
This LEVEL deal was found by Cheapflights users on 4/4. 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.
Tue 4/147:40 pm
SFO
- OPO
1 stop28h 20m
LEVEL
Deal found 4/4![LEVEL logo]()
$367
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 8/125:40 pm
SFO
- OPO
2 stops29h 15m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$372
This Iberia deal was found by Cheapflights users on 4/1. 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.
Sun 9/204:35 pm
SFO
- OPO
2 stops19h 25m
Iberia
Deal found 4/1![Iberia logo]()
$374
This Kiwi.com deal was found by Cheapflights users on 4/3. 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 4/197:40 pm
SFO
- OPO
2 stops27h 40m
Multiple Airlines
Deal found 4/3![Multiple Airlines logo]()
$386
This Kiwi.com deal was found by Cheapflights users on 4/3. 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 5/37:00 am
SFO
- OPO
3 stops48h 40m
Multiple Airlines
Deal found 4/3![Multiple Airlines logo]()
$392
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 8/105:35 pm
SFO
- OPO
2 stops19h 05m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$393
This Kiwi.com deal was found by Cheapflights users on 4/2. 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 4/147:40 pm
SFO
- OPO
2 stops28h 35m
Multiple Airlines
Deal found 4/2![Multiple Airlines logo]()
$409
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 April 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $644 (FlightHub) |
One-way from | $343 (Iberia) |
Popular in | June |
Cheapest in | February |
Average price | $683 |
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 April 5, 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
Sun 4/26
6:45 pm-3:50 pm
1 stop37h 05m
Porto
Tue 5/5
10:40 am-4:40 pm
1 stop38h 00m
$681
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Sun 4/26
11:20 pm-9:45 am
2 stops26h 25m
Porto
Tue 5/5
6:00 am-7:30 pm
2 stops21h 30m
$906
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Sun 7/19
11:10 am-7:00 am
1 stop35h 50m
Porto
Wed 8/5
2:25 pm-5:30 pm
2 stops35h 05m
$926
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Sat 5/9
11:56 am-3:25 pm
2 stops19h 29m
Porto
Sat 5/16
5:00 am-11:45 am
1 stop14h 45m
$934
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Sun 9/6
11:35 am-3:30 pm
2 stops19h 55m
Porto
Tue 9/15
5:00 am-4:03 pm
2 stops19h 03m
$944
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Sun 7/19
3:05 pm-3:30 pm
1 stop16h 25m
Porto
Wed 8/5
12:40 pm-10:38 pm
1 stop17h 58m
$947
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Sat 5/16
1:35 pm-6:10 pm
2 stops20h 35m
Porto
Sat 5/23
5:55 am-12:50 pm
1 stop14h 55m
$973
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Wed 4/29
2:57 pm-10:00 pm
2 stops23h 03m
Porto
Mon 5/11
5:00 am-5:49 pm
2 stops20h 49m
$987
Quickest round-trip
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Mon 6/1
8:10 pm-10:00 pm
1 stop17h 50m
Porto
Tue 6/9
5:00 am-11:45 am
1 stop14h 45m
$1,022
San FranciscoPorto
SFO - OPO
SFOOPO
San Francisco
Mon 6/1
11:55 am-3:25 pm
2 stops19h 30m
Porto
Tue 6/9
5:00 am-11:45 am
1 stop14h 45m
$1,027
Showing 1-10 of 21 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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 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?
Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Porto. Price data was last updated on April 3, 2026.
To ensure you get the cheapest price possible for a flight from San Francisco to Porto, you should look to book at least 83 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, April is the cheapest month in which you can book a flight from San Francisco to Porto (average of $431). Flying from San Francisco to Porto in June is currently the most expensive (average of $920). 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 April 5, 2026.
Read reviews from past customers who have flown SWISS,United Airlines, andAir Canada 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.
Entertainment
6.8
Food
7.1
Overall
7.5
Boarding
7.7
Comfort
7.4
Crew
8.3
Reviews
1 / 20
10.0
ExcellentThomas,Mar 2026
BOS - ZRH
Entertainment
6.8
Food
7.1
Overall
7.5
Boarding
7.7
Comfort
7.4
Crew
8.3
Reviews
1 / 20
10.0
ExcellentThomas,Mar 2026
BOS - ZRH
Entertainment
6.8
Food
7.1
Overall
7.5
Boarding
7.7
Comfort
7.4
Crew
8.3
Reviews
1 / 20
10.0
ExcellentThomas,Mar 2026
BOS - ZRH
Entertainment
6.8
Food
7.1
Overall
7.5
Boarding
7.7
Comfort
7.4
Crew
8.3
Reviews
1 / 20
10.0
ExcellentThomas,Mar 2026
BOS - ZRH
Entertainment
6.8
Food
7.1
Overall
7.5
Boarding
7.7
Comfort
7.4
Crew
8.3
Reviews
1 / 20
10.0
ExcellentThomas,Mar 2026
BOS - ZRH
Entertainment
6.8
Food
7.1
Overall
7.5
Boarding
7.7
Comfort
7.4
Crew
8.3
Reviews
1 / 20
10.0
ExcellentThomas,Mar 2026
BOS - ZRH
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
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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 April 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$431 | Average$719 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$460 | Average$609 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$625 | Average$1,001 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$643 | Average$1,066 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$660 | Average$1,116 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$661 | Average$1,105 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$673 | Average$790 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$675 | Average$1,056 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$787 | Average$1,112 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$1,000 | Average$1,223 | FlexibilityNo cancel fee | On-time71% |