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Cheap flights from San Francisco to Porto from $373

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 5/9. 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.
Turkish Airlines Logo
6:45 pm - 10:00 am
SFO
-
OPO
31h 15m
1 stop
Turkish Airlines Logo
4:50 pm - 4:40 pm
OPO
-
SFO
31h 50m
1 stop
$653Turkish Airlines
Tue, Apr 21 - Tue, Apr 28
Turkish Airlines Logo
6:45 pm - 3:45 pm
SFO
-
OPO
37h 00m
1 stop
Turkish Airlines Logo
11:00 am - 4:40 pm
OPO
-
SFO
37h 40m
1 stop
$657Turkish Airlines
Wed, May 6 - Thu, May 14
Turkish Airlines Logo
12:55 pm - 11:30 pm
SFO
-
OPO
26h 35m
1 stop
Turkish Airlines Logo
10:45 am - 10:50 am
OPO
-
SFO
32h 05m
1 stop
$669Turkish Airlines
Tue, Sep 8 - Wed, Sep 16
Turkish Airlines Logo
12:55 pm - 3:40 pm
SFO
-
OPO
18h 45m
1 stop
Turkish Airlines Logo
10:45 am - 10:50 am
OPO
-
SFO
32h 05m
1 stop
$671Turkish Airlines
Tue, Sep 8 - Wed, Sep 23
Turkish Airlines Logo
12:55 pm - 3:40 pm
SFO
-
OPO
18h 45m
1 stop
Turkish Airlines Logo
10:40 am - 4:40 pm
OPO
-
SFO
38h 00m
1 stop
$676Turkish Airlines
Tue, May 12 - Tue, May 26
Turkish Airlines Logo
6:45 pm - 9:40 am
SFO
-
OPO
30h 55m
1 stop
Turkish Airlines Logo
6:30 am - 10:50 am
OPO
-
SFO
36h 20m
1 stop
$681Turkish Airlines
Wed, Apr 22 - Mon, May 4
Turkish Airlines Logo
6:45 pm - 3:40 pm
SFO
-
OPO
36h 55m
1 stop
Turkish Airlines Logo
10:45 am - 4:40 pm
OPO
-
SFO
37h 55m
1 stop
$700Turkish Airlines
Mon, Apr 20 - Sun, Apr 26
Turkish Airlines Logo
12:55 pm - 9:45 am
SFO
-
OPO
36h 50m
1 stop
Turkish Airlines Logo
10:45 am - 4:40 pm
OPO
-
SFO
37h 55m
1 stop
$702Turkish Airlines
Thu, Sep 10 - Wed, Sep 16
Turkish Airlines Logo
12:55 pm - 9:45 am
SFO
-
OPO
36h 50m
1 stop
Turkish Airlines Logo
10:40 am - 4:40 pm
OPO
-
SFO
38h 00m
1 stop
$703Turkish Airlines
Mon, Apr 6 - Tue, Apr 21
Turkish Airlines Logo
6:45 pm - 9:40 am
SFO
-
OPO
30h 55m
1 stop
Turkish Airlines Logo
4:50 pm - 4:40 pm
OPO
-
SFO
31h 50m
1 stop
$706Turkish Airlines
Sun, Sep 6 - Tue, Sep 15

British Airways flights from San Francisco to Porto

Our best British Airways deals on San Francisco to Porto flight tickets
British Airways
May 6
SFO1:40 pmSan Francisco
21h 15m
2 stops
OPO6:55 pmPorto
May 14
OPO8:20 amPorto
23h 34m
2 stops
SFO11:54 pmSan Francisco
$791
British Airways
Sep 21
SFO4:35 pmSan Francisco
19h 30m
1 stop
OPO8:05 pmPorto
Oct 20
OPO12:25 pmPorto
19h 47m
2 stops
SFO12:12 amSan Francisco
$794
British Airways
Sep 21
SFO3:30 pmSan Francisco
20h 35m
2 stops
OPO8:05 pmPorto
Oct 20
OPO12:25 pmPorto
19h 47m
2 stops
SFO12:12 amSan Francisco
$799

Turkish Airlines flights from San Francisco to Porto

Our best Turkish Airlines deals on San Francisco to Porto flight tickets
Turkish Airlines
Apr 21
SFO6:45 pmSan Francisco
31h 15m
1 stop
OPO10:00 amPorto
Apr 28
OPO4:50 pmPorto
31h 50m
1 stop
SFO4:40 pmSan Francisco
$653
Turkish Airlines
May 6
SFO6:45 pmSan Francisco
37h 00m
1 stop
OPO3:45 pmPorto
May 14
OPO11:00 amPorto
37h 40m
1 stop
SFO4:40 pmSan Francisco
$657
Turkish Airlines
Sep 8
SFO12:55 pmSan Francisco
26h 35m
1 stop
OPO11:30 pmPorto
Sep 16
OPO10:45 amPorto
32h 05m
1 stop
SFO10:50 amSan Francisco
$669

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 March 27, 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

Cheapest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/21

6:45 pm-10:00 am

1 stop31h 15m

Porto

Tue 4/28

4:50 pm-4:40 pm

1 stop31h 50m

$653

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 5/6

6:45 pm-3:45 pm

1 stop37h 00m

Porto

Thu 5/14

11:00 am-4:40 pm

1 stop37h 40m

$657

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/8

12:55 pm-11:30 pm

1 stop26h 35m

Porto

Wed 9/16

10:45 am-10:50 am

1 stop32h 05m

$669
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/8

12:55 pm-3:40 pm

1 stop18h 45m

Porto

Wed 9/23

10:45 am-10:50 am

1 stop32h 05m

$671

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 5/12

12:55 pm-3:40 pm

1 stop18h 45m

Porto

Tue 5/26

10:40 am-4:40 pm

1 stop38h 00m

$676

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 4/22

6:45 pm-9:40 am

1 stop30h 55m

Porto

Mon 5/4

6:30 am-10:50 am

1 stop36h 20m

$681

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 4/20

6:45 pm-3:40 pm

1 stop36h 55m

Porto

Sun 4/26

10:45 am-4:40 pm

1 stop37h 55m

$700

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 9/10

12:55 pm-9:45 am

1 stop36h 50m

Porto

Wed 9/16

10:45 am-4:40 pm

1 stop37h 55m

$702

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 4/6

12:55 pm-9:45 am

1 stop36h 50m

Porto

Tue 4/21

10:40 am-4:40 pm

1 stop38h 00m

$703

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 9/6

6:45 pm-9:40 am

1 stop30h 55m

Porto

Tue 9/15

4:50 pm-4:40 pm

1 stop31h 50m

$706

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 typical price of a round-trip flight between San Francisco and Porto?

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 $578. If you aren’t able to travel during the month of February, then book flights to Porto from San Francisco during April instead. Flights to Porto in April, while not as cheap as those in February, still average around $687.

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 $907 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 $695 on momondo.

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

As of March 2026, prices for San Francisco to Porto flights are approximately 13% 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

17h 15m

Direct flights

None
The fastest flight from San Francisco to Porto takes 17h 15m
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 17h 15m 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
TAP AIR PORTUGALPriceFrom $431Free CancellationRating
7.1
2,182 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.3
1,725 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
7,872 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
1,906 reviews
Search SWISS flights
IberiaPriceFrom $660Free CancellationRating
7.0
3,157 reviews
Search Iberia flights
DeltaPriceFrom $661Free CancellationRating
7.9
8,357 reviews
Search Delta flights
KLMPriceFrom $673Free CancellationRating
7.8
1,477 reviews
Search KLM flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
9,499 reviews
Search United Airlines flights
Air CanadaPriceFrom $787Free CancellationRating
7.1
10,853 reviews
Search Air Canada flights
American AirlinesPriceFrom $1,000Free CancellationRating
7.1
11,520 reviews
Search American Airlines 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
Aveiro
Braga
Matosinhos
Lamego
Esposende
Chaves
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
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.

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