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Cheap flights from San Francisco to Porto from $270

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 10/15. 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 (SFO-OPO)

Cheap round-trip flights

TAP AIR PORTUGAL Logo
6:45 pm - 10:45 pmSFO-OPO
20h 00m2 stops
TAP AIR PORTUGAL Logo
10:30 pm - 2:35 pmOPO-SFO
24h 05m1 stop
$574TAP AIR PORTUGAL
Find Deal
Tue, Sep 9 - Tue, Sep 23
TAP AIR PORTUGAL Logo
4:20 pm - 5:00 pmSFO-OPO
16h 40m1 stop
TAP AIR PORTUGAL Logo
7:00 am - 2:35 pmOPO-SFO
15h 35m1 stop
$575TAP AIR PORTUGAL
Find Deal
Tue, Oct 7 - Wed, Oct 15
TAP AIR PORTUGAL Logo
5:35 pm - 3:00 pmSFO-OPO
14h 25m1 stop
TAP AIR PORTUGAL Logo
9:00 am - 4:05 pmOPO-SFO
15h 05m1 stop
$576TAP AIR PORTUGAL
Find Deal
Sat, Nov 1 - Fri, Nov 14
United Airlines Logo
10:59 pm - 9:30 amSFO-OPO
27h 31m2 stops
United Airlines Logo
12:30 pm - 8:10 pmOPO-SFO
15h 40m1 stop
$590United Airlines
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Sat, Nov 1 - Fri, Nov 14
United Airlines Logo
8:30 am - 9:30 amSFO-OPO
17h 00m2 stops
United Airlines Logo
6:00 am - 8:57 pmOPO-SFO
22h 57m2 stops
$594United Airlines
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Wed, Nov 12 - Wed, Nov 26
SWISS Logo
7:30 pm - 6:30 pmSFO-OPO
15h 00m1 stop
SWISS Logo
7:20 pm - 4:30 pmOPO-SFO
29h 10m1 stop
$602SWISS
Find Deal
Wed, Oct 22 - Mon, Nov 3
Iberia Logo
6:51 am - 3:55 pmSFO-OPO
25h 04m2 stops
Iberia Logo
8:40 pm - 9:26 amOPO-SFO
20h 46m2 stops
$608Iberia
Find Deal
Wed, Oct 22 - Mon, Nov 3
Lufthansa Logo
2:40 pm - 3:15 pmSFO-OPO
16h 35m1 stop
Lufthansa Logo
1:45 pm - 6:45 pmOPO-SFO
37h 00m1 stop
$614Lufthansa
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Sun, Dec 28 - Mon, Jan 19
SWISS Logo
7:30 pm - 6:30 pmSFO-OPO
15h 00m1 stop
SWISS Logo
9:10 am - 4:30 pmOPO-SFO
39h 20m2 stops
$635SWISS
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Wed, Oct 22 - Mon, Nov 3
Lufthansa Logo
2:40 pm - 3:15 pmSFO-OPO
16h 35m1 stop
Lufthansa Logo
1:45 pm - 7:35 pmOPO-SFO
37h 50m1 stop
$640Lufthansa
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Sun, Nov 9 - Sun, Nov 16

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
Sep 9
SFO6:45 pmSan Francisco
20h 00m
2 stops
OPO10:45 pmPorto
Sep 23
OPO10:30 pmPorto
24h 05m
1 stop
SFO2:35 pmSan Francisco
$574
Find similar
TAP AIR PORTUGAL
Oct 7
SFO4:20 pmSan Francisco
16h 40m
1 stop
OPO5:00 pmPorto
Oct 15
OPO7:00 amPorto
15h 35m
1 stop
SFO2:35 pmSan Francisco
$575
Find similar
TAP AIR PORTUGAL
Nov 1
SFO5:35 pmSan Francisco
14h 25m
1 stop
OPO3:00 pmPorto
Nov 14
OPO9:00 amPorto
15h 05m
1 stop
SFO4:05 pmSan Francisco
$576
Find similar

Lufthansa flights from San Francisco to Porto

Our best Lufthansa deals on San Francisco to Porto flight tickets
Lufthansa
Dec 28
SFO2:40 pmSan Francisco
16h 35m
1 stop
OPO3:15 pmPorto
Jan 19
OPO1:45 pmPorto
37h 00m
1 stop
SFO6:45 pmSan Francisco
$614
Find similar
Lufthansa
Nov 9
SFO2:40 pmSan Francisco
16h 35m
1 stop
OPO3:15 pmPorto
Nov 16
OPO1:45 pmPorto
37h 50m
1 stop
SFO7:35 pmSan Francisco
$640
Find similar
Lufthansa
Oct 14
SFO9:05 pmSan Francisco
18h 15m
1 stop
OPO11:20 pmPorto
Oct 22
OPO6:15 amPorto
21h 25m
2 stops
SFO7:40 pmSan Francisco
$686
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 August 14, 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

Tue 9/9

6:45 pm-10:45 pm

2 stops20h 00m

Porto

Tue 9/23

10:30 pm-2:35 pm

1 stop24h 05m

$574

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 10/7

4:20 pm-5:00 pm

1 stop16h 40m

Porto

Wed 10/15

7:00 am-2:35 pm

1 stop15h 35m

$575

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 11/1

5:35 pm-3:00 pm

1 stop14h 25m

Porto

Fri 11/14

9:00 am-4:05 pm

1 stop15h 05m

$576

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 11/1

10:59 pm-9:30 am

2 stops27h 31m

Porto

Fri 11/14

12:30 pm-8:10 pm

1 stop15h 40m

$590

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 11/12

8:30 am-9:30 am

2 stops17h 00m

Porto

Wed 11/26

6:00 am-8:57 pm

2 stops22h 57m

$594

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/22

7:30 pm-6:30 pm

1 stop15h 00m

Porto

Mon 11/3

7:20 pm-4:30 pm

1 stop29h 10m

$602

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/22

6:51 am-3:55 pm

2 stops25h 04m

Porto

Mon 11/3

8:40 pm-9:26 am

2 stops20h 46m

$608

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 12/28

2:40 pm-3:15 pm

1 stop16h 35m

Porto

Mon 1/19

1:45 pm-6:45 pm

1 stop37h 00m

$614

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/22

7:30 pm-6:30 pm

1 stop15h 00m

Porto

Mon 11/3

9:10 am-4:30 pm

2 stops39h 20m

$635

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 11/9

2:40 pm-3:15 pm

1 stop16h 35m

Porto

Sun 11/16

1:45 pm-7:35 pm

1 stop37h 50m

$640

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 $959 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 $763 on momondo.

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

As of August 2025, prices for San Francisco to Porto flights are approximately 14% 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

Best Price Found

$270

Fastest flight time

14h 10m

Direct flights

None

Airports in Porto

1 airport
The best one-way flight to Porto from San Francisco in the past 72 hours is $270. The best round-trip flight deal from San Francisco to Porto found on momondo in the last 72 hours is $574.
The fastest flight from San Francisco to Porto takes 14h 10m
There are no direct flights from San Francisco to Porto. Popular non-direct route for this connection is San Francisco Airport - Porto Airport.
There is 1 airport near Porto: Porto (OPO)
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
IberiaPriceFrom $556Free CancellationRating
7.0
2,878 reviews
Search Iberia flights
TAP AIR PORTUGALPriceFrom $570Free CancellationRating
7.1
1,948 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $624Free CancellationRating
7.4
1,468 reviews
Search Scandinavian Airlines flights
SWISSPriceFrom $636Free CancellationRating
7.5
1,699 reviews
Search SWISS flights
American AirlinesPriceFrom $653Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
KLMPriceFrom $702Free CancellationRating
7.8
1,381 reviews
Search KLM flights
United AirlinesPriceFrom $709Free CancellationRating
7.4
8,916 reviews
Search United Airlines flights
Air CanadaPriceFrom $711Free CancellationRating
7.1
9,949 reviews
Search Air Canada flights
DeltaPriceFrom $712Free CancellationRating
8.0
7,980 reviews
Search Delta flights
Air TransatPriceFrom $781Free CancellationRating
7.7
427 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
Aveiro
Coimbra
Braga
Matosinhos
Caminha
Lamego
Guimarães
Esposende
Chaves
Arcos de Valdevez
Espinho
Viseu
Ponte de Lima
Pinhao
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
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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