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Cheap flights from San Francisco to Porto from $265

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to Porto departing on 4/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from San Francisco to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
4:45 pm - 8:40 am
SFO
-
OPO
31h 55m
1 stop
Scandinavian Airlines Logo
5:55 pm - 2:40 pm
OPO
-
SFO
28h 45m
1 stop
$510Scandinavian Airlines
Thu, Apr 23 - Fri, May 8
Scandinavian Airlines Logo
5:40 pm - 9:35 am
SFO
-
OPO
32h 55m
1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pm
OPO
-
SFO
29h 00m
1 stop
$518Scandinavian Airlines
Mon, Mar 9 - Mon, Mar 23
TAP AIR PORTUGAL Logo
7:55 pm - 6:55 pm
SFO
-
OPO
15h 00m
1 stop
TAP AIR PORTUGAL Logo
4:20 pm - 2:35 pm
OPO
-
SFO
30h 15m
1 stop
$519TAP AIR PORTUGAL
Thu, Apr 23 - Mon, Apr 27
TAP AIR PORTUGAL Logo
4:35 pm - 3:00 pm
SFO
-
OPO
14h 25m
1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:35 pm
OPO
-
SFO
15h 40m
1 stop
$521TAP AIR PORTUGAL
Mon, Feb 2 - Mon, Feb 9
TAP AIR PORTUGAL Logo
4:35 pm - 6:15 pm
SFO
-
OPO
17h 40m
1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:35 pm
OPO
-
SFO
15h 40m
1 stop
$522TAP AIR PORTUGAL
Mon, Feb 23 - Mon, Mar 2
TAP AIR PORTUGAL Logo
7:35 pm - 8:25 pm
SFO
-
OPO
16h 50m
1 stop
TAP AIR PORTUGAL Logo
5:05 am - 2:35 pm
OPO
-
SFO
17h 30m
1 stop
$539TAP AIR PORTUGAL
Sat, Apr 4 - Tue, Apr 14
Multiple Airlines Logo
7:40 pm - 8:00 am
SFO
-
OPO
28h 20m
1 stop
Multiple Airlines Logo
10:00 pm - 5:55 pm
OPO
-
SFO
27h 55m
1 stop
$541Multiple Airlines
Sun, Apr 26 - Wed, May 6
TAP AIR PORTUGAL Logo
5:35 pm - 7:55 am
SFO
-
OPO
31h 20m
1 stop
TAP AIR PORTUGAL Logo
6:55 am - 3:35 pm
OPO
-
SFO
15h 40m
1 stop
$543TAP AIR PORTUGAL
Mon, Mar 9 - Mon, Mar 23
TAP AIR PORTUGAL Logo
4:35 pm - 4:15 pm
SFO
-
OPO
15h 40m
1 stop
TAP AIR PORTUGAL Logo
10:00 am - 5:35 pm
OPO
-
SFO
15h 35m
1 stop
$548TAP AIR PORTUGAL
Tue, Apr 28 - Sat, May 9
Scandinavian Airlines Logo
4:45 pm - 11:00 am
SFO
-
OPO
34h 15m
1 stop
Scandinavian Airlines Logo
11:50 am - 2:40 pm
OPO
-
SFO
34h 50m
1 stop
$557Scandinavian Airlines
Mon, Apr 27 - Wed, May 6

KLM flights from San Francisco to Porto

Our best KLM deals on San Francisco to Porto flight tickets
KLM
Apr 22
SFO8:10 pmSan Francisco
17h 50m
1 stop
OPO10:00 pmPorto
Apr 27
OPO7:00 pmPorto
24h 45m
1 stop
SFO11:45 amSan Francisco
$671
KLM
Apr 22
SFO8:10 pmSan Francisco
17h 50m
1 stop
OPO10:00 pmPorto
Apr 27
OPO7:00 pmPorto
24h 45m
1 stop
SFO11:45 amSan Francisco
$673

TAP AIR PORTUGAL flights from San Francisco to Porto

Our best TAP AIR PORTUGAL deals on San Francisco to Porto flight tickets
TAP AIR PORTUGAL
Apr 23
SFO7:55 pmSan Francisco
15h 00m
1 stop
OPO6:55 pmPorto
Apr 27
OPO4:20 pmPorto
30h 15m
1 stop
SFO2:35 pmSan Francisco
$519
TAP AIR PORTUGAL
Feb 2
SFO4:35 pmSan Francisco
14h 25m
1 stop
OPO3:00 pmPorto
Feb 9
OPO6:55 amPorto
15h 40m
1 stop
SFO2:35 pmSan Francisco
$521
TAP AIR PORTUGAL
Feb 23
SFO4:35 pmSan Francisco
17h 40m
1 stop
OPO6:15 pmPorto
Mar 2
OPO6:55 amPorto
15h 40m
1 stop
SFO2:35 pmSan Francisco
$522

momondo 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, momondo users made 832,500 searches. Data last updated January 15, 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

Price

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 4/23

4:45 pm-8:40 am

1 stop31h 55m

Porto

Fri 5/8

5:55 pm-2:40 pm

1 stop28h 45m

$510

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 3/9

5:40 pm-9:35 am

1 stop32h 55m

Porto

Mon 3/23

5:35 pm-3:35 pm

1 stop29h 00m

$518

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 4/23

7:55 pm-6:55 pm

1 stop15h 00m

Porto

Mon 4/27

4:20 pm-2:35 pm

1 stop30h 15m

$519

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/2

4:35 pm-3:00 pm

1 stop14h 25m

Porto

Mon 2/9

6:55 am-2:35 pm

1 stop15h 40m

$521

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/23

4:35 pm-6:15 pm

1 stop17h 40m

Porto

Mon 3/2

6:55 am-2:35 pm

1 stop15h 40m

$522

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 4/4

7:35 pm-8:25 pm

1 stop16h 50m

Porto

Tue 4/14

5:05 am-2:35 pm

1 stop17h 30m

$539

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 4/26

7:40 pm-8:00 am

1 stop28h 20m

Porto

Wed 5/6

10:00 pm-5:55 pm

1 stop27h 55m

$541

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 3/9

5:35 pm-7:55 am

1 stop31h 20m

Porto

Mon 3/23

6:55 am-3:35 pm

1 stop15h 40m

$543

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/28

4:35 pm-4:15 pm

1 stop15h 40m

Porto

Sat 5/9

10:00 am-5:35 pm

1 stop15h 35m

$548

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 4/27

4:45 pm-11:00 am

1 stop34h 15m

Porto

Wed 5/6

11:50 am-2:40 pm

1 stop34h 50m

$557

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Porto from

How to get the cheapest flight ticket from San Francisco to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Porto?

The month of February is, on average, the cheapest month to fly to Porto from San Francisco, with most prices found around $724. If you aren’t able to travel during the month of February, then book flights to Porto from San Francisco during November instead. Flights to Porto in November, while not as cheap as those in February, still average around $731.

How far in advance should I book a flight to Porto?

You are more likely to see cheaper flights to Porto from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $915 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from San Francisco for as low as $724 on momondo.

How have San Francisco to Porto flight prices changed over time?

As of January 2026, prices for San Francisco to Porto flights are approximately 15% cheaper when compared to flights at the same time last year.

When to book flights from San Francisco to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from San Francisco to Porto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap San Francisco to Porto (SFO to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Francisco to Porto

Fastest flight time

13h 50m

Direct flights

None
The fastest flight from San Francisco to Porto takes 13h 50m
There are no direct flights from San Francisco to Porto. There are no popular flight routes from San Francisco to Porto.
Search flight deals

  • How far is San Francisco to Porto by plane?

    Porto is 5565.0 mi away from San Francisco. Typically, this will take 13h 50m by plane in normal conditions.

  • When did momondo last update prices for flights from San Francisco Airport to Porto Airport?

    Prices for flights from San Francisco Airport to Porto Airport were last updated today.

  • How many operators does momondo search for flights from San Francisco Airport to Porto Airport?

  • How old do you have to be to fly from San Francisco Airport to Porto Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Airport to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The necessary travel and health documents for your Porto Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from San Francisco to Porto?

Best airlines flying from San Francisco to Porto

Compare and see reviews for airlines that fly from San Francisco to Porto with momondo
Airline
Rating
Free Cancellation
Price
Scandinavian AirlinesPriceFrom $499Free CancellationRating
7.3
1,654 reviews
Search Scandinavian Airlines flights
TAP AIR PORTUGALPriceFrom $573Free CancellationRating
7.1
2,121 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $625Free CancellationRating
6.8
7,718 reviews
Search Lufthansa flights
SWISSPriceFrom $626Free CancellationRating
7.5
1,849 reviews
Search SWISS flights
DeltaPriceFrom $661Free CancellationRating
7.9
8,051 reviews
Search Delta flights
KLMPriceFrom $673Free CancellationRating
7.7
1,440 reviews
Search KLM flights
IberiaPriceFrom $685Free CancellationRating
7.0
3,087 reviews
Search Iberia flights
United AirlinesPriceFrom $694Free CancellationRating
7.4
9,164 reviews
Search United Airlines flights
VuelingPriceFrom $756Free CancellationRating
7.1
1,229 reviews
Search Vueling flights
Air CanadaPriceFrom $776Free CancellationRating
7.1
10,624 reviews
Search Air Canada flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Braga
Matosinhos
Aveiro
Esposende
Lamego
Guimarães
Chaves
Espinho
Pinhao
Arcos de Valdevez
Ponte de Lima
Viseu
Curia
Penafiel
Mesao Frio
Mira
Baiao

Why use momondo?

Why should I use momondo to find a flight deal from San Francisco to Porto?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Porto from San Francisco.

Can I find flights from San Francisco to Porto with flexible booking policies on momondo?

Flights from San Francisco to Porto with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from San Francisco to Porto?

Once all potential San Francisco to Porto flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from San Francisco to Porto right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Porto, momondo offers a useful price alert feature which will track prices for flights to Porto from San Francisco and alert you when they change.

An easier way to manage your Porto trip

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