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Cheap flights from San Francisco to Porto from $250

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 9/28. 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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Find the cheapest flights from San Francisco to Porto

Cheap round-trip flights

Scandinavian Airlines Logo
4:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
Scandinavian Airlines Logo
5:35 pm - 2:35 pmOPO-SFO
29h 00m1 stop
$477Scandinavian Airlines
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Thu, Nov 6 - Fri, Nov 21
Scandinavian Airlines Logo
4:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
Scandinavian Airlines Logo
5:45 pm - 2:35 pmOPO-SFO
28h 50m1 stop
$498Scandinavian Airlines
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Thu, Nov 27 - Fri, Dec 5
TAP AIR PORTUGAL Logo
7:35 pm - 6:05 pmSFO-OPO
15h 30m1 stop
TAP AIR PORTUGAL Logo
6:55 am - 4:05 pmOPO-SFO
17h 10m1 stop
$515TAP AIR PORTUGAL
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Sat, Oct 25 - Fri, Nov 7
TAP AIR PORTUGAL Logo
4:20 pm - 10:45 pmSFO-OPO
22h 25m1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 2:35 pmOPO-SFO
24h 05m1 stop
$525TAP AIR PORTUGAL
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Tue, Oct 7 - Tue, Oct 14
United Airlines Logo
7:25 am - 9:30 amSFO-OPO
18h 05m2 stops
United Airlines Logo
12:30 pm - 8:10 pmOPO-SFO
15h 40m1 stop
$534United Airlines
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Wed, Nov 26 - Wed, Dec 10
United Airlines Logo
10:45 pm - 9:30 amSFO-OPO
26h 45m2 stops
United Airlines Logo
12:35 pm - 9:47 amOPO-SFO
29h 12m2 stops
$535United Airlines
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Mon, Nov 3 - Tue, Nov 18
SWISS Logo
7:25 pm - 11:15 amSFO-OPO
31h 50m1 stop
SWISS Logo
7:20 pm - 4:30 pmOPO-SFO
29h 10m1 stop
$550SWISS
Find Deal
Tue, Dec 2 - Mon, Dec 8
SWISS Logo
7:25 pm - 11:15 amSFO-OPO
31h 50m1 stop
SWISS Logo
12:05 pm - 4:30 pmOPO-SFO
36h 25m1 stop
$553SWISS
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Tue, Feb 10 - Mon, Feb 16
Lufthansa Logo
8:35 pm - 11:40 pmSFO-OPO
19h 05m1 stop
Lufthansa Logo
6:00 am - 8:25 pmOPO-SFO
22h 25m2 stops
$560Lufthansa
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Wed, Feb 11 - Tue, Feb 17
Lufthansa Logo
2:40 pm - 10:25 pmSFO-OPO
23h 45m1 stop
Lufthansa Logo
6:00 am - 8:25 pmOPO-SFO
22h 25m2 stops
$564Lufthansa
Find Deal
Mon, Feb 9 - Tue, Feb 17

Scandinavian Airlines flights from San Francisco to Porto

Our best Scandinavian Airlines deals on San Francisco to Porto flight tickets
Scandinavian Airlines
Nov 6
SFO4:40 pmSan Francisco
16h 15m
1 stop
OPO4:55 pmPorto
Nov 21
OPO5:35 pmPorto
29h 00m
1 stop
SFO2:35 pmSan Francisco
$477
Find similar
Scandinavian Airlines
Nov 27
SFO4:40 pmSan Francisco
16h 15m
1 stop
OPO4:55 pmPorto
Dec 5
OPO5:45 pmPorto
28h 50m
1 stop
SFO2:35 pmSan Francisco
$498
Find similar
Scandinavian Airlines
Mar 5
SFO4:40 pmSan Francisco
16h 15m
1 stop
OPO4:55 pmPorto
Mar 9
OPO5:35 pmPorto
29h 00m
1 stop
SFO3:35 pmSan Francisco
$499
Find similar

Air Transat flights from San Francisco to Porto

Our best Air Transat deals on San Francisco to Porto flight tickets
Air Transat
Sep 15
SFO1:25 pmSan Francisco
14h 30m
1 stop
OPO11:55 amPorto
Sep 23
OPO1:30 pmPorto
30h 53m
1 stop
SFO12:23 pmSan Francisco
$832
Find similar
Air Transat
Sep 15
SFO1:25 pmSan Francisco
14h 30m
1 stop
OPO11:55 amPorto
Sep 23
OPO1:30 pmPorto
30h 53m
1 stop
SFO12:23 pmSan Francisco
$862
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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 September 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

Thu 11/6

4:40 pm-4:55 pm

1 stop16h 15m

Porto

Fri 11/21

5:35 pm-2:35 pm

1 stop29h 00m

$477

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 11/27

4:40 pm-4:55 pm

1 stop16h 15m

Porto

Fri 12/5

5:45 pm-2:35 pm

1 stop28h 50m

$498

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 10/25

7:35 pm-6:05 pm

1 stop15h 30m

Porto

Fri 11/7

6:55 am-4:05 pm

1 stop17h 10m

$515

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 10/7

4:20 pm-10:45 pm

1 stop22h 25m

Porto

Tue 10/14

10:30 pm-2:35 pm

1 stop24h 05m

$525

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 11/26

7:25 am-9:30 am

2 stops18h 05m

Porto

Wed 12/10

12:30 pm-8:10 pm

1 stop15h 40m

$534

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 11/3

10:45 pm-9:30 am

2 stops26h 45m

Porto

Tue 11/18

12:35 pm-9:47 am

2 stops29h 12m

$535

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 12/2

7:25 pm-11:15 am

1 stop31h 50m

Porto

Mon 12/8

7:20 pm-4:30 pm

1 stop29h 10m

$550

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 2/10

7:25 pm-11:15 am

1 stop31h 50m

Porto

Mon 2/16

12:05 pm-4:30 pm

1 stop36h 25m

$553

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 2/11

8:35 pm-11:40 pm

1 stop19h 05m

Porto

Tue 2/17

6:00 am-8:25 pm

2 stops22h 25m

$560

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 2/9

2:40 pm-10:25 pm

1 stop23h 45m

Porto

Tue 2/17

6:00 am-8:25 pm

2 stops22h 25m

$564

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 $678. If you aren’t able to travel during the month of January, then book flights to Porto from San Francisco during February instead. Flights to Porto in February, while not as cheap as those in January, still average around $718.

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 $946 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 $756 on momondo.

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

As of September 2025, prices for San Francisco to Porto flights are approximately 4% 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

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 45m 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
IberiaPriceFrom $540Free CancellationRating
7.0
2,929 reviews
Search Iberia flights
TAP AIR PORTUGALPriceFrom $570Free CancellationRating
7.1
1,977 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $624Free CancellationRating
7.4
1,484 reviews
Search Scandinavian Airlines flights
United AirlinesPriceFrom $652Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
American AirlinesPriceFrom $653Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $661Free CancellationRating
7.9
7,960 reviews
Search Delta flights
LufthansaPriceFrom $667Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
KLMPriceFrom $673Free CancellationRating
7.8
1,385 reviews
Search KLM flights
SWISSPriceFrom $680Free CancellationRating
7.5
1,731 reviews
Search SWISS flights
Air CanadaPriceFrom $776Free CancellationRating
7.1
10,000 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
Aveiro
Coimbra
Braga
Matosinhos
Caminha
Guimarães
Esposende
Lamego
Chaves
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Pinhao
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
Mira

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

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