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Cheap flights from San Francisco to Porto from $256

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 2/24. 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

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Scandinavian Airlines Logo
5:40 pm - 4:45 pmSFO-OPO
16h 05m1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pmOPO-SFO
29h 00m1 stop
$461Scandinavian Airlines
Find Deal
Sun, Mar 8 - Mon, Mar 23
Scandinavian Airlines Logo
5:40 pm - 4:45 pmSFO-OPO
16h 05m1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pmOPO-SFO
29h 00m1 stop
$489Scandinavian Airlines
Find Deal
Sun, Mar 8 - Mon, Mar 16
Scandinavian Airlines Logo
5:40 pm - 4:45 pmSFO-OPO
16h 05m1 stop
Scandinavian Airlines Logo
10:25 am - 3:35 pmOPO-SFO
36h 10m1 stop
$491Scandinavian Airlines
Find Deal
Sun, Mar 8 - Wed, Mar 18
Scandinavian Airlines Logo
5:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pmOPO-SFO
29h 00m1 stop
$499Scandinavian Airlines
Find Deal
Thu, Mar 12 - Mon, Mar 16
Scandinavian Airlines Logo
5:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
Scandinavian Airlines Logo
10:25 am - 3:35 pmOPO-SFO
36h 10m1 stop
$501Scandinavian Airlines
Find Deal
Thu, Mar 12 - Wed, Mar 18
Scandinavian Airlines Logo
5:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pmOPO-SFO
29h 00m1 stop
$509Scandinavian Airlines
Find Deal
Thu, Mar 12 - Fri, Mar 20
Scandinavian Airlines Logo
5:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pmOPO-SFO
29h 00m1 stop
$511Scandinavian Airlines
Find Deal
Thu, Mar 12 - Fri, Mar 20
TAP AIR PORTUGAL Logo
4:35 pm - 5:00 pmSFO-OPO
16h 25m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:30 pmOPO-SFO
15h 35m1 stop
$512TAP AIR PORTUGAL
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Mon, Feb 23 - Wed, Mar 4
Scandinavian Airlines Logo
4:03 pm - 4:55 pmSFO-OPO
41h 52m2 stops
Scandinavian Airlines Logo
10:25 am - 3:35 pmOPO-SFO
36h 10m1 stop
$516Scandinavian Airlines
Find Deal
Wed, Mar 11 - Wed, Mar 18
Scandinavian Airlines Logo
1:05 pm - 4:55 pmSFO-OPO
44h 50m2 stops
Scandinavian Airlines Logo
10:25 am - 3:35 pmOPO-SFO
36h 10m1 stop
$517Scandinavian Airlines
Find Deal
Wed, Mar 11 - Wed, Mar 18

SWISS flights from San Francisco to Porto

Our best SWISS deals on San Francisco to Porto flight tickets
SWISS
Mar 10
SFO8:25 pmSan Francisco
15h 05m
1 stop
OPO6:30 pmPorto
Mar 18
OPO7:20 pmPorto
29h 10m
1 stop
SFO5:30 pmSan Francisco
$548
Find similar
SWISS
Mar 8
SFO8:25 pmSan Francisco
15h 05m
1 stop
OPO6:30 pmPorto
Mar 19
OPO11:25 amPorto
37h 05m
1 stop
SFO5:30 pmSan Francisco
$565
Find similar
SWISS
Mar 8
SFO8:25 pmSan Francisco
15h 05m
1 stop
OPO6:30 pmPorto
Mar 19
OPO11:25 amPorto
37h 05m
1 stop
SFO5:30 pmSan Francisco
$567
Find similar

Lufthansa flights from San Francisco to Porto

Our best Lufthansa deals on San Francisco to Porto flight tickets
Lufthansa
Mar 11
SFO10:40 pmSan Francisco
18h 00m
1 stop
OPO11:40 pmPorto
Mar 19
OPO6:00 amPorto
22h 10m
1 stop
SFO9:10 pmSan Francisco
$550
Find similar
Lufthansa
Jan 21
SFO12:50 pmSan Francisco
18h 35m
2 stops
OPO3:25 pmPorto
Feb 11
OPO6:00 amPorto
17h 55m
1 stop
SFO3:55 pmSan Francisco
$555
Find similar
Lufthansa
Feb 8
SFO2:40 pmSan Francisco
23h 45m
1 stop
OPO10:25 pmPorto
Feb 27
OPO12:30 pmPorto
15h 40m
1 stop
SFO8:10 pmSan Francisco
$560
Find similar

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 December 2, 2025.
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

Sun 3/8

5:40 pm-4:45 pm

1 stop16h 05m

Porto

Mon 3/23

5:35 pm-3:35 pm

1 stop29h 00m

$461

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 3/8

5:40 pm-4:45 pm

1 stop16h 05m

Porto

Mon 3/16

5:35 pm-3:35 pm

1 stop29h 00m

$489

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 3/8

5:40 pm-4:45 pm

1 stop16h 05m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$491

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 3/12

5:40 pm-4:55 pm

1 stop16h 15m

Porto

Mon 3/16

5:35 pm-3:35 pm

1 stop29h 00m

$499

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 3/12

5:40 pm-4:55 pm

1 stop16h 15m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$501

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 3/12

5:40 pm-4:55 pm

1 stop16h 15m

Porto

Fri 3/20

5:35 pm-3:35 pm

1 stop29h 00m

$509

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 3/12

5:40 pm-4:55 pm

1 stop16h 15m

Porto

Fri 3/20

5:35 pm-3:35 pm

1 stop29h 00m

$511

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/23

4:35 pm-5:00 pm

1 stop16h 25m

Porto

Wed 3/4

6:55 am-2:30 pm

1 stop15h 35m

$512

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

4:03 pm-4:55 pm

2 stops41h 52m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$516

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

1:05 pm-4:55 pm

2 stops44h 50m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$517

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 January is, on average, the cheapest month to fly to Porto from San Francisco, with most prices found around $652. If you aren’t able to travel during the month of January, then book flights to Porto from San Francisco during October instead. Flights to Porto in October, while not as cheap as those in January, still average around $709.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Thursday when prices can be found for as low as $981. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Wednesday because tickets tend to average around $1,148. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the afternoon is the cheapest time of day to fly from San Francisco to Porto when you can find flight prices for as low as $896. Flying to Porto in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,138 on average. Flights to Porto from San Francisco in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $918 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 $751 on momondo.

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

As of December 2025, prices for San Francisco to Porto flights are approximately 6% 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

14h 20m

Direct flights

None
The fastest flight from San Francisco to Porto takes 14h 20m
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 14h 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
Scandinavian AirlinesPriceFrom $527Free CancellationRating
7.4
1,591 reviews
Search Scandinavian Airlines flights
IberiaPriceFrom $540Free CancellationRating
7.0
3,038 reviews
Search Iberia flights
TAP AIR PORTUGALPriceFrom $574Free CancellationRating
7.1
2,081 reviews
Search TAP AIR PORTUGAL flights
SWISSPriceFrom $636Free CancellationRating
7.5
1,798 reviews
Search SWISS flights
United AirlinesPriceFrom $652Free CancellationRating
7.4
9,063 reviews
Search United Airlines flights
LufthansaPriceFrom $667Free CancellationRating
6.8
7,603 reviews
Search Lufthansa flights
KLMPriceFrom $673Free CancellationRating
7.7
1,426 reviews
Search KLM flights
VuelingPriceFrom $756Free CancellationRating
7.1
1,213 reviews
Search Vueling flights
Air CanadaPriceFrom $776Free CancellationRating
7.1
10,496 reviews
Search Air Canada flights
Air TransatPriceFrom $781Free CancellationRating
7.8
480 reviews
Search Air Transat 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
Guimarães
Lamego
Esposende
Chaves
Viseu
Espinho
Ponte de Lima
Arcos de Valdevez
Pinhao
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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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