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Cheap flights from San Francisco to Porto from $263

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to Porto departing on 9/22. 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
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.
SWISS Logo
7:35 pm - 7:55 am
SFO
-
OPO
28h 20m
1 stop
SWISS Logo
12:15 pm - 4:15 pm
OPO
-
SFO
36h 00m
1 stop
$263SWISS
Tue, Sep 22 - Tue, Sep 29
SWISS Logo
7:35 pm - 11:25 am
SFO
-
OPO
31h 50m
1 stop
SWISS Logo
12:15 pm - 4:15 pm
OPO
-
SFO
36h 00m
1 stop
$263SWISS
Tue, Sep 22 - Tue, Sep 29
TAP AIR PORTUGAL Logo
5:35 pm - 3:00 pm
SFO
-
OPO
14h 25m
1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 2:45 pm
OPO
-
SFO
26h 45m
1 stop
$656TAP AIR PORTUGAL
Sat, Oct 31 - Fri, Nov 6
TAP AIR PORTUGAL Logo
4:30 pm - 6:55 pm
SFO
-
OPO
18h 25m
1 stop
TAP AIR PORTUGAL Logo
5:00 am - 3:45 pm
OPO
-
SFO
17h 45m
1 stop
$656TAP AIR PORTUGAL
Thu, Oct 8 - Sat, Oct 31
Scandinavian Airlines Logo
4:45 pm - 5:00 pm
SFO
-
OPO
16h 15m
1 stop
Scandinavian Airlines Logo
11:55 am - 2:50 pm
OPO
-
SFO
34h 55m
1 stop
$701Scandinavian Airlines
Wed, Nov 4 - Wed, Nov 11
Scandinavian Airlines Logo
4:45 pm - 11:10 am
SFO
-
OPO
34h 25m
1 stop
Scandinavian Airlines Logo
5:35 pm - 2:50 pm
OPO
-
SFO
29h 15m
1 stop
$712Scandinavian Airlines
Thu, Nov 5 - Sun, Nov 15
Multiple Airlines Logo
8:25 am - 3:20 pm
SFO
-
OPO
22h 55m
2 stops
Multiple Airlines Logo
1:45 pm - 7:35 pm
OPO
-
SFO
37h 50m
1 stop
$736Multiple Airlines
Wed, Nov 18 - Wed, Dec 2
Multiple Airlines Logo
11:29 pm - 12:50 pm
SFO
-
OPO
29h 21m
2 stops
Multiple Airlines Logo
12:05 pm - 4:30 pm
OPO
-
SFO
36h 25m
1 stop
$736Multiple Airlines
Sun, Nov 8 - Tue, Nov 17
United Airlines Logo
6:30 am - 9:30 am
SFO
-
OPO
19h 00m
2 stops
United Airlines Logo
6:00 am - 8:10 pm
OPO
-
SFO
22h 10m
1 stop
$745United Airlines
Tue, Dec 1 - Tue, Dec 8
United Airlines Logo
10:55 pm - 9:30 am
SFO
-
OPO
26h 35m
2 stops
United Airlines Logo
6:00 am - 8:10 pm
OPO
-
SFO
22h 10m
1 stop
$750United Airlines
Tue, Dec 1 - Tue, Dec 8

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Iberia flights from San Francisco to Porto

Our best Iberia deals on San Francisco to Porto flight tickets
Iberia
Nov 4
SFO12:04 pmSan Francisco
19h 56m
2 stops
OPO4:00 pmPorto
Nov 11
OPO8:20 amPorto
19h 40m
2 stops
SFO8:00 pmSan Francisco
$740
Iberia
Nov 18
SFO10:32 amSan Francisco
17h 13m
2 stops
OPO11:45 amPorto
Dec 2
OPO8:40 pmPorto
22h 39m
2 stops
SFO11:19 amSan Francisco
$741

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
Oct 31
SFO5:35 pmSan Francisco
14h 25m
1 stop
OPO3:00 pmPorto
Nov 6
OPO8:00 pmPorto
26h 45m
1 stop
SFO2:45 pmSan Francisco
$656
TAP AIR PORTUGAL
Oct 5
SFO4:30 pmSan Francisco
24h 10m
1 stop
OPO12:40 amPorto
Oct 19
OPO9:15 pmPorto
24h 20m
1 stop
SFO1:35 pmSan Francisco
$668
TAP AIR PORTUGAL
Nov 18
SFO4:35 pmSan Francisco
34h 25m
1 stop
OPO11:00 amPorto
Dec 2
OPO7:00 amPorto
15h 45m
1 stop
SFO2:45 pmSan Francisco
$672

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 August 1, 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 9/22

7:35 pm-7:55 am

1 stop28h 20m

Porto

Tue 9/29

12:15 pm-4:15 pm

1 stop36h 00m

$263

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/22

7:35 pm-11:25 am

1 stop31h 50m

Porto

Tue 9/29

12:15 pm-4:15 pm

1 stop36h 00m

$263

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 10/31

5:35 pm-3:00 pm

1 stop14h 25m

Porto

Fri 11/6

8:00 pm-2:45 pm

1 stop26h 45m

$656
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 10/8

4:30 pm-6:55 pm

1 stop18h 25m

Porto

Sat 10/31

5:00 am-3:45 pm

1 stop17h 45m

$656

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 11/4

4:45 pm-5:00 pm

1 stop16h 15m

Porto

Wed 11/11

11:55 am-2:50 pm

1 stop34h 55m

$701

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 11/5

4:45 pm-11:10 am

1 stop34h 25m

Porto

Sun 11/15

5:35 pm-2:50 pm

1 stop29h 15m

$712

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 11/18

8:25 am-3:20 pm

2 stops22h 55m

Porto

Wed 12/2

1:45 pm-7:35 pm

1 stop37h 50m

$736

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 11/8

11:29 pm-12:50 pm

2 stops29h 21m

Porto

Tue 11/17

12:05 pm-4:30 pm

1 stop36h 25m

$736

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 12/1

6:30 am-9:30 am

2 stops19h 00m

Porto

Tue 12/8

6:00 am-8:10 pm

1 stop22h 10m

$745

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 12/1

10:55 pm-9:30 am

2 stops26h 35m

Porto

Tue 12/8

6:00 am-8:10 pm

1 stop22h 10m

$750

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 $902 to $1,260.
The lowest price recently found on this route was $263.

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 $625.

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 $906 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 August 2026, prices for San Francisco to Porto flights are approximately 23% more expensive 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

16h 30m

Direct flights

None
The fastest flight from San Francisco to Porto takes 16h 30m
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 16h 30m 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
2,353 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,913 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,176 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
2,021 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,460 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
10,062 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,552 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.8
8,493 reviews
Search Delta flights
Air FrancePriceFrom $855Free CancellationRating
7.5
1,632 reviews
Search Air France flights
Air CanadaPriceFrom $860Free CancellationRating
7.1
11,420 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
Aveiro
Matosinhos
Pinhao
Esposende
Lamego
Chaves
Arcos de Valdevez
Guimarães
Viseu
Espinho
Ponte de Lima
Mesao Frio
Penafiel
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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