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Cheap flights from San Francisco to Porto from $344

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from San Francisco to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
11:10 am - 6:50 amSFO  San Francisco-OPO Porto
35h 40m1 stop Montreal Pierre Elliott Trudeau Intl
Multiple Airlines Logo
12:05 pm - 4:30 pmOPO  Porto-SFO San Francisco
36h 25m1 stop Zurich
$576Multiple Airlines
Sun, Oct 18 - Tue, Nov 3
American Airlines Logo
8:47 am - 11:45 amSFO  San Francisco-OPO Porto
18h 58m2 stops Chicago O'Hare Intl Madrid Barajas
American Airlines Logo
8:20 am - 7:59 pmOPO  Porto-SFO San Francisco
19h 39m2 stops Madrid Barajas Chicago O'Hare Intl
$602American Airlines
Mon, Nov 2 - Tue, Nov 17
United Airlines Logo
11:59 pm - 9:30 amSFO  San Francisco-OPO Porto
25h 31m1 stop Newark
United Airlines Logo
12:35 pm - 8:10 pmOPO  Porto-SFO San Francisco
15h 35m1 stop Frankfurt am Main
$613United Airlines
Mon, Nov 2 - Tue, Nov 17
SWISS Logo
7:25 pm - 11:15 amSFO  San Francisco-OPO Porto
31h 50m1 stop Zurich
SWISS Logo
12:05 pm - 4:30 pmOPO  Porto-SFO San Francisco
36h 25m1 stop Zurich
$624SWISS
Sun, Jan 31 - Tue, Feb 16
SWISS Logo
7:25 pm - 11:15 amSFO  San Francisco-OPO Porto
31h 50m1 stop Zurich
SWISS Logo
12:05 pm - 4:30 pmOPO  Porto-SFO San Francisco
36h 25m1 stop Zurich
$624SWISS
Wed, Feb 3 - Mon, Feb 15
Delta Logo
6:00 am - 10:35 amSFO  San Francisco-OPO Porto
20h 35m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle
Delta Logo
5:00 am - 11:45 amOPO  Porto-SFO San Francisco
14h 45m1 stop Amsterdam Schiphol
$629Delta
Mon, Nov 2 - Tue, Nov 17
Lufthansa Logo
9:40 pm - 11:55 pmSFO  San Francisco-OPO Porto
18h 15m1 stop Munich Franz Josef Strauss
Lufthansa Logo
6:15 am - 7:35 pmOPO  Porto-SFO San Francisco
21h 20m1 stop Munich Franz Josef Strauss
$632Lufthansa
Wed, Feb 3 - Fri, Feb 19
Lufthansa Logo
9:40 pm - 11:55 pmSFO  San Francisco-OPO Porto
18h 15m1 stop Munich Franz Josef Strauss
Lufthansa Logo
1:45 pm - 7:35 pmOPO  Porto-SFO San Francisco
37h 50m1 stop Munich Franz Josef Strauss
$634Lufthansa
Wed, Feb 3 - Thu, Feb 18
United Airlines Logo
11:30 pm - 11:40 amSFO  San Francisco-OPO Porto
28h 10m2 stops Chicago O'Hare Intl Frankfurt am Main
United Airlines Logo
6:00 am - 4:05 pmOPO  Porto-SFO San Francisco
18h 05m1 stop Frankfurt am Main
$663United Airlines
Sat, Feb 6 - Tue, Feb 16
Delta Logo
6:00 am - 10:35 amSFO  San Francisco-OPO Porto
20h 35m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle
Delta Logo
5:00 am - 11:45 amOPO  Porto-SFO San Francisco
14h 45m1 stop Amsterdam Schiphol
$742Delta
Mon, Nov 2 - Fri, Nov 13

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United Airlines flights from San Francisco to Porto

Our best United Airlines deals on San Francisco to Porto flight tickets
United Airlines
Nov 2
SFO11:59 pmSan Francisco
25h 31m
1 stop
OPO9:30 amPorto
Nov 17
OPO12:35 pmPorto
15h 35m
1 stop
SFO8:10 pmSan Francisco
$613
United Airlines
Nov 10
SFO7:15 amSan Francisco
18h 15m
2 stops
OPO9:30 amPorto
Nov 17
OPO12:35 pmPorto
15h 35m
1 stop
SFO8:10 pmSan Francisco
$616
United Airlines
Feb 6
SFO11:30 pmSan Francisco
28h 10m
2 stops
OPO11:40 amPorto
Feb 16
OPO6:00 amPorto
18h 05m
1 stop
SFO4:05 pmSan Francisco
$663

American Airlines flights from San Francisco to Porto

Our best American Airlines deals on San Francisco to Porto flight tickets
American Airlines
Nov 2
SFO8:47 amSan Francisco
18h 58m
2 stops
OPO11:45 amPorto
Nov 17
OPO8:20 amPorto
19h 39m
2 stops
SFO7:59 pmSan Francisco
$602
American Airlines
Nov 10
SFO8:47 amSan Francisco
18h 58m
2 stops
OPO11:45 amPorto
Nov 17
OPO8:20 amPorto
19h 39m
2 stops
SFO7:59 pmSan Francisco
$610

momondo Fare Finder

 
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 San Francisco - OPO Porto

SFOOPO

San Francisco

Sun 10/18

11:10 am-6:50 am

1 stop35h 40m

Porto

Tue 11/3

12:05 pm-4:30 pm

1 stop36h 25m

$576

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 11/2

8:47 am-11:45 am

2 stops18h 58m

Porto

Tue 11/17

8:20 am-7:59 pm

2 stops19h 39m

$602

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 11/2

11:59 pm-9:30 am

1 stop25h 31m

Porto

Tue 11/17

12:35 pm-8:10 pm

1 stop15h 35m

$613

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Sun 1/31

7:25 pm-11:15 am

1 stop31h 50m

Porto

Tue 2/16

12:05 pm-4:30 pm

1 stop36h 25m

$624

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Wed 2/3

7:25 pm-11:15 am

1 stop31h 50m

Porto

Mon 2/15

12:05 pm-4:30 pm

1 stop36h 25m

$624
Quickest round-trip

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 11/2

6:00 am-10:35 am

2 stops20h 35m

Porto

Tue 11/17

5:00 am-11:45 am

1 stop14h 45m

$629

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Wed 2/3

9:40 pm-11:55 pm

1 stop18h 15m

Porto

Fri 2/19

6:15 am-7:35 pm

1 stop21h 20m

$632

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Wed 2/3

9:40 pm-11:55 pm

1 stop18h 15m

Porto

Thu 2/18

1:45 pm-7:35 pm

1 stop37h 50m

$634

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Sat 2/6

11:30 pm-11:40 am

2 stops28h 10m

Porto

Tue 2/16

6:00 am-4:05 pm

1 stop18h 05m

$663

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 11/2

6:00 am-10:35 am

2 stops20h 35m

Porto

Fri 11/13

5:00 am-11:45 am

1 stop14h 45m

$742

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

Prices are currently low for flights on this route.

Typical prices usually range from $972 to $1,295.
The lowest price recently found on this route was $576.

What is the cheapest month to fly to Porto?

The month of March is, on average, the cheapest month to fly to Porto from San Francisco, with most prices found around $612. If you aren’t able to travel during the month of March, then book flights to Porto from San Francisco during February instead. Flights to Porto in February, while not as cheap as those in March, still average around $675.

How far in advance should I book a flight from San Francisco 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 $936 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 $716 on momondo.

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

As of September 2026, prices for San Francisco to Porto flights are approximately 11% 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

Best Price Found

$344

Fastest flight time

15h 25m

Direct flights

None
The best one-way flight to Porto from San Francisco in the past 72 hours is $344. The best round-trip flight deal from San Francisco to Porto found on momondo in the last 72 hours is $576.
The fastest flight from San Francisco to Porto takes 15h 25m
There are no direct flights from San Francisco to Porto. There are no popular flight routes from San Francisco to Porto.
Search flight deals

Frequently asked questions about flying from San Francisco to Porto

  • How far is San Francisco to Porto by plane?

    Porto is 5565.0 mi away from San Francisco. Typically, this will take 15h 25m 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
7.2
2,386 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $460Free CancellationRating
7.4
1,984 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,220 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
2,068 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,474 reviews
Search Turkish Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,576 reviews
Search KLM flights
United AirlinesPriceFrom $740Free CancellationRating
7.4
10,205 reviews
Search United Airlines flights
DeltaPriceFrom $764Free CancellationRating
7.8
8,567 reviews
Search Delta flights
Air FrancePriceFrom $855Free CancellationRating
7.5
1,650 reviews
Search Air France flights

Traveling to a place near Porto?

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

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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