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Cheap flights from San Francisco to Porto from $438

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 12/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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Scandinavian Airlines Logo
1:00 pm - 4:55 pmSFO-OPO
44h 55m2 stops
Scandinavian Airlines Logo
10:25 am - 3:35 pmOPO-SFO
36h 10m1 stop
$454Scandinavian Airlines
Find Deal
Wed, Mar 11 - Wed, Mar 18
Scandinavian Airlines Logo
4:45 pm - 8:40 amSFO-OPO
31h 55m1 stop
Scandinavian Airlines Logo
5:55 pm - 2:40 pmOPO-SFO
28h 45m1 stop
$499Scandinavian Airlines
Find Deal
Thu, Apr 16 - Sun, Apr 26
TAP AIR PORTUGAL Logo
4:35 pm - 3:00 pmSFO-OPO
14h 25m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:35 pmOPO-SFO
15h 40m1 stop
$575TAP AIR PORTUGAL
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Mon, Feb 23 - Mon, Mar 2
Multiple Airlines Logo
8:25 am - 7:25 pmSFO-OPO
27h 00m2 stops
Multiple Airlines Logo
5:35 pm - 12:40 pmOPO-SFO
27h 05m2 stops
$591Multiple Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9
TAP AIR PORTUGAL Logo
4:35 pm - 10:00 amSFO-OPO
33h 25m1 stop
TAP AIR PORTUGAL Logo
10:25 pm - 4:35 pmOPO-SFO
26h 10m1 stop
$593TAP AIR PORTUGAL
Find Deal
Tue, Apr 28 - Wed, May 20
TAP AIR PORTUGAL Logo
4:35 pm - 5:00 pmSFO-OPO
16h 25m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:35 pmOPO-SFO
15h 40m1 stop
$600TAP AIR PORTUGAL
Find Deal
Mon, Dec 1 - Mon, Dec 8
Multiple Airlines Logo
8:25 am - 3:00 pmSFO-OPO
22h 35m3 stops
Multiple Airlines Logo
5:35 pm - 9:22 pmOPO-SFO
35h 47m3 stops
$613Multiple Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9
TAP AIR PORTUGAL Logo
8:10 pm - 5:00 pmSFO-OPO
13h 50m1 stop
TAP AIR PORTUGAL Logo
9:00 am - 4:50 pmOPO-SFO
15h 50m1 stop
$636TAP AIR PORTUGAL
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Fri, Mar 27 - Fri, Apr 3
Lufthansa Logo
10:40 pm - 11:40 pmSFO-OPO
18h 00m1 stop
Lufthansa Logo
1:45 pm - 8:35 pmOPO-SFO
37h 50m1 stop
$639Lufthansa
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Wed, Mar 11 - Wed, Mar 18
Turkish Airlines Logo
6:50 pm - 9:55 amSFO-OPO
31h 05m1 stop
Turkish Airlines Logo
4:10 pm - 4:45 pmOPO-SFO
32h 35m1 stop
$647Turkish Airlines
Find Deal
Thu, Jan 15 - Thu, Jan 22

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
Feb 23
SFO4:35 pmSan Francisco
14h 25m
1 stop
OPO3:00 pmPorto
Mar 2
OPO6:55 amPorto
15h 40m
1 stop
SFO2:35 pmSan Francisco
$575
Find similar
TAP AIR PORTUGAL
Apr 28
SFO4:35 pmSan Francisco
33h 25m
1 stop
OPO10:00 amPorto
May 20
OPO10:25 pmPorto
26h 10m
1 stop
SFO4:35 pmSan Francisco
$593
Find similar
TAP AIR PORTUGAL
Dec 1
SFO4:35 pmSan Francisco
16h 25m
1 stop
OPO5:00 pmPorto
Dec 8
OPO6:55 amPorto
15h 40m
1 stop
SFO2:35 pmSan Francisco
$600
Find similar

SWISS flights from San Francisco to Porto

Our best SWISS deals on San Francisco to Porto flight tickets
SWISS
Feb 23
SFO12:50 pmSan Francisco
21h 45m
2 stops
OPO6:35 pmPorto
Mar 2
OPO9:10 amPorto
36h 10m
2 stops
SFO1:20 pmSan Francisco
$805
Find similar
SWISS
Nov 23
SFO10:45 amSan Francisco
14h 45m
1 stop
OPO9:30 amPorto
Dec 1
OPO12:05 pmPorto
36h 25m
1 stop
SFO4:30 pmSan Francisco
$1,620
Find similar
SWISS
Nov 22
SFO7:25 pmSan Francisco
15h 10m
1 stop
OPO6:35 pmPorto
Dec 1
OPO12:05 pmPorto
36h 25m
1 stop
SFO4:30 pmSan Francisco
$1,800
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 November 13, 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

Wed 3/11

1:00 pm-4:55 pm

2 stops44h 55m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$454

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 4/16

4:45 pm-8:40 am

1 stop31h 55m

Porto

Sun 4/26

5:55 pm-2:40 pm

1 stop28h 45m

$499

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/23

4:35 pm-3:00 pm

1 stop14h 25m

Porto

Mon 3/2

6:55 am-2:35 pm

1 stop15h 40m

$575

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 12/2

8:25 am-7:25 pm

2 stops27h 00m

Porto

Tue 12/9

5:35 pm-12:40 pm

2 stops27h 05m

$591

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/28

4:35 pm-10:00 am

1 stop33h 25m

Porto

Wed 5/20

10:25 pm-4:35 pm

1 stop26h 10m

$593

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 12/1

4:35 pm-5:00 pm

1 stop16h 25m

Porto

Mon 12/8

6:55 am-2:35 pm

1 stop15h 40m

$600

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 12/2

8:25 am-3:00 pm

3 stops22h 35m

Porto

Tue 12/9

5:35 pm-9:22 pm

3 stops35h 47m

$613

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Fri 3/27

8:10 pm-5:00 pm

1 stop13h 50m

Porto

Fri 4/3

9:00 am-4:50 pm

1 stop15h 50m

$636

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

10:40 pm-11:40 pm

1 stop18h 00m

Porto

Wed 3/18

1:45 pm-8:35 pm

1 stop37h 50m

$639

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 1/15

6:50 pm-9:55 am

1 stop31h 05m

Porto

Thu 1/22

4:10 pm-4:45 pm

1 stop32h 35m

$647

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 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 $922 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 November 2025, prices for San Francisco to Porto flights are approximately 3% 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

Direct flights

None
There are no direct flights from San Francisco to Porto. There are no popular flight routes from San Francisco to Porto.
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  • 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 $527Free CancellationRating
7.4
1,575 reviews
Search Scandinavian Airlines flights
IberiaPriceFrom $540Free CancellationRating
7.0
3,010 reviews
Search Iberia flights
TAP AIR PORTUGALPriceFrom $573Free CancellationRating
7.1
2,059 reviews
Search TAP AIR PORTUGAL flights
SWISSPriceFrom $636Free CancellationRating
7.5
1,784 reviews
Search SWISS flights
United AirlinesPriceFrom $652Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
DeltaPriceFrom $661Free CancellationRating
7.9
8,009 reviews
Search Delta flights
LufthansaPriceFrom $667Free CancellationRating
6.8
7,570 reviews
Search Lufthansa flights
KLMPriceFrom $673Free CancellationRating
7.7
1,410 reviews
Search KLM flights
Air CanadaPriceFrom $776Free CancellationRating
7.1
10,444 reviews
Search Air Canada flights
Air TransatPriceFrom $781Free CancellationRating
7.8
471 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
Aveiro
Matosinhos
Braga
Lamego
Guimarães
Esposende
Chaves
Espinho
Viseu
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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