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Cheap flights from San Francisco to Porto from $239

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 1/24. 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

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
4:03 pm - 4:55 pm
SFO
-
OPO
41h 52m2 stops
Scandinavian Airlines Logo
10:25 am - 3:35 pm
OPO
-
SFO
36h 10m1 stop
$524Scandinavian Airlines
Wed, Mar 11 - Wed, Mar 18
Scandinavian Airlines Logo
4:03 pm - 4:55 pm
SFO
-
OPO
41h 52m2 stops
Scandinavian Airlines Logo
10:25 am - 3:35 pm
OPO
-
SFO
36h 10m1 stop
$526Scandinavian Airlines
Wed, Mar 11 - Wed, Mar 18
Scandinavian Airlines Logo
4:03 pm - 4:55 pm
SFO
-
OPO
41h 52m2 stops
Scandinavian Airlines Logo
5:55 pm - 2:40 pm
OPO
-
SFO
28h 45m1 stop
$530Scandinavian Airlines
Wed, Mar 11 - Fri, Apr 3
Scandinavian Airlines Logo
4:45 pm - 5:05 pm
SFO
-
OPO
16h 20m1 stop
Scandinavian Airlines Logo
11:50 am - 2:40 pm
OPO
-
SFO
34h 50m1 stop
$541Scandinavian Airlines
Sat, Apr 18 - Thu, May 7
Scandinavian Airlines Logo
4:45 pm - 5:05 pm
SFO
-
OPO
16h 20m1 stop
Scandinavian Airlines Logo
5:55 pm - 2:40 pm
OPO
-
SFO
28h 45m1 stop
$569Scandinavian Airlines
Sat, Apr 18 - Fri, May 1
TAP AIR PORTUGAL Logo
4:35 pm - 5:00 pm
SFO
-
OPO
16h 25m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:35 pm
OPO
-
SFO
15h 40m1 stop
$576TAP AIR PORTUGAL
Mon, Feb 23 - Mon, Mar 2
TAP AIR PORTUGAL Logo
4:35 pm - 10:00 pm
SFO
-
OPO
21h 25m1 stop
TAP AIR PORTUGAL Logo
8:00 pm - 2:30 pm
OPO
-
SFO
26h 30m1 stop
$578TAP AIR PORTUGAL
Mon, Jan 19 - Tue, Jan 27
TAP AIR PORTUGAL Logo
4:35 pm - 10:00 am
SFO
-
OPO
33h 25m1 stop
TAP AIR PORTUGAL Logo
2:50 pm - 2:35 pm
OPO
-
SFO
31h 45m1 stop
$582TAP AIR PORTUGAL
Sat, Jan 17 - Sun, Jan 25
TAP AIR PORTUGAL Logo
4:35 pm - 4:15 pm
SFO
-
OPO
15h 40m1 stop
TAP AIR PORTUGAL Logo
5:05 am - 2:35 pm
OPO
-
SFO
17h 30m1 stop
$587TAP AIR PORTUGAL
Tue, Apr 14 - Tue, Apr 28
TAP AIR PORTUGAL Logo
4:35 pm - 6:05 pm
SFO
-
OPO
17h 30m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:45 pm
OPO
-
SFO
15h 50m1 stop
$590TAP AIR PORTUGAL
Sat, Jan 17 - Sat, Jan 24

Air France flights from San Francisco to Porto

Our best Air France deals on San Francisco to Porto flight tickets
Air France
Dec 21
SFO3:40 pmSan Francisco
34h 50m
1 stop
OPO10:30 amPorto
Jan 6
OPO11:25 amPorto
34h 00m
1 stop
SFO1:25 pmSan Francisco
$3,051
Find similar
Air France
Dec 21
SFO3:40 pmSan Francisco
34h 50m
1 stop
OPO10:30 amPorto
Jan 6
OPO11:25 amPorto
20h 00m
2 stops
SFO11:25 pmSan Francisco
$4,242
Find similar
Air France
Dec 16
SFO3:40 pmSan Francisco
34h 50m
1 stop
OPO10:30 amPorto
Dec 27
OPO11:25 amPorto
34h 00m
1 stop
SFO1:25 pmSan Francisco
$4,783
Find similar

SWISS flights from San Francisco to Porto

Our best SWISS deals on San Francisco to Porto flight tickets
SWISS
Dec 21
SFO5:25 pmSan Francisco
33h 50m
2 stops
OPO11:15 amPorto
Jan 4
OPO7:25 pmPorto
49h 55m
2 stops
SFO1:20 pmSan Francisco
$3,311
Find similar
SWISS
Dec 21
SFO5:25 pmSan Francisco
33h 50m
2 stops
OPO11:15 amPorto
Jan 6
OPO11:25 amPorto
33h 55m
2 stops
SFO1:20 pmSan Francisco
$3,640
Find similar
SWISS
Dec 19
SFO5:25 pmSan Francisco
30h 40m
2 stops
OPO8:05 amPorto
Jan 4
OPO7:25 pmPorto
49h 55m
2 stops
SFO1:20 pmSan Francisco
$3,771
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 11, 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

4:03 pm-4:55 pm

2 stops41h 52m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$524

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

$526

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

4:03 pm-4:55 pm

2 stops41h 52m

Porto

Fri 4/3

5:55 pm-2:40 pm

1 stop28h 45m

$530

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 4/18

4:45 pm-5:05 pm

1 stop16h 20m

Porto

Thu 5/7

11:50 am-2:40 pm

1 stop34h 50m

$541

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 4/18

4:45 pm-5:05 pm

1 stop16h 20m

Porto

Fri 5/1

5:55 pm-2:40 pm

1 stop28h 45m

$569

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/23

4:35 pm-5:00 pm

1 stop16h 25m

Porto

Mon 3/2

6:55 am-2:35 pm

1 stop15h 40m

$576

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 1/19

4:35 pm-10:00 pm

1 stop21h 25m

Porto

Tue 1/27

8:00 pm-2:30 pm

1 stop26h 30m

$578

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 1/17

4:35 pm-10:00 am

1 stop33h 25m

Porto

Sun 1/25

2:50 pm-2:35 pm

1 stop31h 45m

$582

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/14

4:35 pm-4:15 pm

1 stop15h 40m

Porto

Tue 4/28

5:05 am-2:35 pm

1 stop17h 30m

$587

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 1/17

4:35 pm-6:05 pm

1 stop17h 30m

Porto

Sat 1/24

6:55 am-2:45 pm

1 stop15h 50m

$590

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 November instead. Flights to Porto in November, while not as cheap as those in January, still average around $731.

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 $903 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 $724 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 19% 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 20m 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
1,605 reviews
Search Scandinavian Airlines flights
IberiaPriceFrom $540Free CancellationRating
7.0
3,045 reviews
Search Iberia flights
TAP AIR PORTUGALPriceFrom $574Free CancellationRating
7.1
2,089 reviews
Search TAP AIR PORTUGAL flights
SWISSPriceFrom $636Free CancellationRating
7.5
1,810 reviews
Search SWISS flights
United AirlinesPriceFrom $652Free CancellationRating
7.4
9,094 reviews
Search United Airlines flights
LufthansaPriceFrom $659Free CancellationRating
6.8
7,626 reviews
Search Lufthansa flights
DeltaPriceFrom $661Free CancellationRating
7.9
8,007 reviews
Search Delta flights
KLMPriceFrom $673Free CancellationRating
7.7
1,432 reviews
Search KLM flights
VuelingPriceFrom $756Free CancellationRating
7.1
1,219 reviews
Search Vueling flights
Air CanadaPriceFrom $776Free CancellationRating
7.1
10,517 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
Guimarães
Esposende
Lamego
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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