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Cheap flights from San Francisco to Porto from $241

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 2/1. 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
4:40 pm - 4:55 pm
SFO
-
OPO
16h 15m1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pm
OPO
-
SFO
29h 00m1 stop
$470Scandinavian Airlines
Thu, Mar 5 - Mon, Mar 9
Scandinavian Airlines Logo
4:40 pm - 4:55 pm
SFO
-
OPO
16h 15m1 stop
Scandinavian Airlines Logo
5:35 pm - 10:59 pm
OPO
-
SFO
36h 24m2 stops
$547Scandinavian Airlines
Thu, Mar 5 - Mon, Mar 9
TAP AIR PORTUGAL Logo
4:35 pm - 10:00 pm
SFO
-
OPO
21h 25m1 stop
TAP AIR PORTUGAL Logo
4:00 pm - 2:30 pm
OPO
-
SFO
30h 30m1 stop
$575TAP AIR PORTUGAL
Mon, Feb 23 - Tue, Mar 3
TAP AIR PORTUGAL Logo
4:35 pm - 6:00 pm
SFO
-
OPO
17h 25m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 2:30 pm
OPO
-
SFO
15h 35m1 stop
$600TAP AIR PORTUGAL
Wed, Jan 21 - Wed, Jan 28
TAP AIR PORTUGAL Logo
5:35 pm - 6:00 pm
SFO
-
OPO
17h 25m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 3:30 pm
OPO
-
SFO
15h 35m1 stop
$601TAP AIR PORTUGAL
Wed, Mar 11 - Wed, Mar 18
TAP AIR PORTUGAL Logo
5:35 pm - 6:00 pm
SFO
-
OPO
17h 25m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 3:30 pm
OPO
-
SFO
15h 35m1 stop
$602TAP AIR PORTUGAL
Wed, Mar 11 - Wed, Mar 18
Multiple Airlines Logo
4:40 pm - 9:15 pm
SFO
-
OPO
20h 35m2 stops
Multiple Airlines Logo
1:00 pm - 2:35 pm
OPO
-
SFO
33h 35m2 stops
$615Multiple Airlines
Thu, Feb 5 - Thu, Feb 12
Multiple Airlines Logo
4:40 pm - 8:10 am
SFO
-
OPO
31h 30m3 stops
Multiple Airlines Logo
12:00 pm - 2:35 pm
OPO
-
SFO
34h 35m2 stops
$653Multiple Airlines
Thu, Feb 5 - Thu, Feb 12
Turkish Airlines Logo
6:50 pm - 3:10 pm
SFO
-
OPO
36h 20m1 stop
Turkish Airlines Logo
10:55 am - 4:45 pm
OPO
-
SFO
37h 50m1 stop
$661Turkish Airlines
Thu, Feb 5 - Thu, Feb 12
Scandinavian Airlines Logo
5:40 pm - 4:45 pm
SFO
-
OPO
16h 05m1 stop
Scandinavian Airlines Logo
11:25 am - 3:35 pm
OPO
-
SFO
35h 10m2 stops
$678Scandinavian Airlines
Sun, Mar 8 - Sat, Mar 14

Lufthansa flights from San Francisco to Porto

Our best Lufthansa deals on San Francisco to Porto flight tickets
Lufthansa
Jan 21
SFO1:30 pmSan Francisco
15h 45m
1 stop
OPO1:15 pmPorto
Jan 28
OPO1:45 pmPorto
37h 10m
1 stop
SFO6:55 pmSan Francisco
$802
Find similar
Lufthansa
Dec 26
SFO9:40 pmSan Francisco
18h 00m
1 stop
OPO11:40 pmPorto
Jan 3
OPO12:30 pmPorto
35h 25m
1 stop
SFO3:55 pmSan Francisco
$3,380
Find similar

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
Jan 21
SFO4:35 pmSan Francisco
17h 25m
1 stop
OPO6:00 pmPorto
Jan 28
OPO6:55 amPorto
15h 35m
1 stop
SFO2:30 pmSan Francisco
$600
Find similar
TAP AIR PORTUGAL
Mar 11
SFO5:35 pmSan Francisco
16h 25m
1 stop
OPO5:00 pmPorto
Mar 18
OPO6:55 amPorto
15h 35m
1 stop
SFO3:30 pmSan Francisco
$602
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 23, 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

Thu 3/5

4:40 pm-4:55 pm

1 stop16h 15m

Porto

Mon 3/9

5:35 pm-3:35 pm

1 stop29h 00m

$470

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 3/5

4:40 pm-4:55 pm

1 stop16h 15m

Porto

Mon 3/9

5:35 pm-10:59 pm

2 stops36h 24m

$547

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/23

4:35 pm-10:00 pm

1 stop21h 25m

Porto

Tue 3/3

4:00 pm-2:30 pm

1 stop30h 30m

$575

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 1/21

4:35 pm-6:00 pm

1 stop17h 25m

Porto

Wed 1/28

6:55 am-2:30 pm

1 stop15h 35m

$600

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

5:35 pm-6:00 pm

1 stop17h 25m

Porto

Wed 3/18

6:55 am-3:30 pm

1 stop15h 35m

$601

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

5:35 pm-6:00 pm

1 stop17h 25m

Porto

Wed 3/18

6:55 am-3:30 pm

1 stop15h 35m

$602

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 2/5

4:40 pm-9:15 pm

2 stops20h 35m

Porto

Thu 2/12

1:00 pm-2:35 pm

2 stops33h 35m

$615

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 2/5

4:40 pm-8:10 am

3 stops31h 30m

Porto

Thu 2/12

12:00 pm-2:35 pm

2 stops34h 35m

$653

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 2/5

6:50 pm-3:10 pm

1 stop36h 20m

Porto

Thu 2/12

10:55 am-4:45 pm

1 stop37h 50m

$661

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 3/8

5:40 pm-4:45 pm

1 stop16h 05m

Porto

Sat 3/14

11:25 am-3:35 pm

2 stops35h 10m

$678

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 $671. 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 $904 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 50m

Direct flights

None
The fastest flight from San Francisco to Porto takes 14h 50m
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 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
1,621 reviews
Search Scandinavian Airlines flights
IberiaPriceFrom $540Free CancellationRating
7.0
3,057 reviews
Search Iberia flights
TAP AIR PORTUGALPriceFrom $574Free CancellationRating
7.2
2,096 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $625Free CancellationRating
6.8
7,650 reviews
Search Lufthansa flights
SWISSPriceFrom $626Free CancellationRating
7.5
1,817 reviews
Search SWISS flights
DeltaPriceFrom $661Free CancellationRating
7.9
8,015 reviews
Search Delta flights
KLMPriceFrom $673Free CancellationRating
7.7
1,434 reviews
Search KLM flights
United AirlinesPriceFrom $694Free CancellationRating
7.4
9,109 reviews
Search United Airlines flights
VuelingPriceFrom $756Free CancellationRating
7.1
1,219 reviews
Search Vueling flights
Air CanadaPriceFrom $776Free CancellationRating
7.1
10,551 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
Arcos de Valdevez
Pinhao
Ponte de Lima
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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