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Cheap flights from San Francisco to Porto from $328

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 8/22. 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
4:15 pm - 5:00 pm
SFO
-
OPO
40h 45m
2 stops
Scandinavian Airlines Logo
5:35 pm - 2:50 pm
OPO
-
SFO
29h 15m
1 stop
$727Scandinavian Airlines
Tue, Nov 3 - Sun, Nov 15
Scandinavian Airlines Logo
7:00 am - 11:05 am
SFO
-
OPO
20h 05m
2 stops
Scandinavian Airlines Logo
5:35 pm - 1:13 am
OPO
-
SFO
39h 38m
2 stops
$769Scandinavian Airlines
Tue, Nov 3 - Sun, Nov 15
Iberia Logo
2:56 pm - 4:00 pm
SFO
-
OPO
18h 04m
2 stops
Iberia Logo
9:55 pm - 3:00 pm
OPO
-
SFO
25h 05m
2 stops
$775Iberia
Wed, Oct 28 - Tue, Nov 3
SWISS Logo
8:25 pm - 6:30 pm
SFO
-
OPO
15h 05m
1 stop
SWISS Logo
7:20 pm - 4:30 pm
OPO
-
SFO
29h 10m
1 stop
$790SWISS
Wed, Oct 28 - Tue, Nov 3
Scandinavian Airlines Logo
4:45 pm - 11:00 am
SFO
-
OPO
34h 15m
1 stop
Scandinavian Airlines Logo
11:50 am - 2:40 pm
OPO
-
SFO
34h 50m
1 stop
$795Scandinavian Airlines
Mon, Aug 17 - Thu, Aug 27
American Airlines Logo
11:30 am - 4:00 pm
SFO
-
OPO
20h 30m
2 stops
American Airlines Logo
12:25 pm - 12:12 am
OPO
-
SFO
19h 47m
2 stops
$798American Airlines
Tue, Oct 6 - Tue, Oct 20
Delta Logo
6:15 am - 10:30 am
SFO
-
OPO
21h 15m
2 stops
Delta Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
$807Delta
Wed, Oct 28 - Tue, Nov 3
Iberia Logo
11:30 am - 4:00 pm
SFO
-
OPO
20h 30m
2 stops
Iberia Logo
8:40 pm - 10:59 pm
OPO
-
SFO
34h 19m
2 stops
$809Iberia
Tue, Oct 6 - Tue, Oct 13
Multiple Airlines Logo
11:10 am - 7:00 am
SFO
-
OPO
35h 50m
1 stop
Multiple Airlines Logo
6:20 am - 7:00 pm
OPO
-
SFO
20h 40m
1 stop
$812Multiple Airlines
Tue, Oct 6 - Tue, Oct 20
Multiple Airlines Logo
4:30 pm - 9:20 pm
SFO
-
OPO
20h 50m
2 stops
Multiple Airlines Logo
6:35 pm - 2:35 pm
OPO
-
SFO
28h 00m
2 stops
$818Multiple Airlines
Mon, Aug 10 - Tue, Aug 25

Air Canada flights from San Francisco to Porto

Our best Air Canada deals on San Francisco to Porto flight tickets
Air Canada
Oct 7
SFO5:00 amSan Francisco
18h 00m
2 stops
OPO7:00 amPorto
Oct 15
OPO6:00 amPorto
23h 20m
2 stops
SFO9:20 pmSan Francisco
$840
Air Canada
Jul 14
SFO6:30 pmSan Francisco
28h 30m
2 stops
OPO7:00 amPorto
Aug 27
OPO11:50 amPorto
20h 17m
2 stops
SFO12:07 amSan Francisco
$847
Air Canada
Aug 8
SFO4:30 pmSan Francisco
35h 30m
2 stops
OPO12:00 pmPorto
Aug 26
OPO2:25 pmPorto
14h 26m
1 stop
SFO8:51 pmSan Francisco
$861

Iberia flights from San Francisco to Porto

Our best Iberia deals on San Francisco to Porto flight tickets
Iberia
Oct 28
SFO2:56 pmSan Francisco
18h 04m
2 stops
OPO4:00 pmPorto
Nov 3
OPO9:55 pmPorto
25h 05m
2 stops
SFO3:00 pmSan Francisco
$775
Iberia
Oct 6
SFO11:30 amSan Francisco
20h 30m
2 stops
OPO4:00 pmPorto
Oct 13
OPO8:40 pmPorto
34h 19m
2 stops
SFO10:59 pmSan Francisco
$809
Iberia
Oct 2
SFO7:30 pmSan Francisco
28h 10m
2 stops
OPO7:40 amPorto
Oct 15
OPO8:20 amPorto
23h 52m
2 stops
SFO12:12 amSan Francisco
$857

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 May 25, 2026.
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

Cheapest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 11/3

4:15 pm-5:00 pm

2 stops40h 45m

Porto

Sun 11/15

5:35 pm-2:50 pm

1 stop29h 15m

$727

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 11/3

7:00 am-11:05 am

2 stops20h 05m

Porto

Sun 11/15

5:35 pm-1:13 am

2 stops39h 38m

$769

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/28

2:56 pm-4:00 pm

2 stops18h 04m

Porto

Tue 11/3

9:55 pm-3:00 pm

2 stops25h 05m

$775

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/28

8:25 pm-6:30 pm

1 stop15h 05m

Porto

Tue 11/3

7:20 pm-4:30 pm

1 stop29h 10m

$790

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/17

4:45 pm-11:00 am

1 stop34h 15m

Porto

Thu 8/27

11:50 am-2:40 pm

1 stop34h 50m

$795

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 10/6

11:30 am-4:00 pm

2 stops20h 30m

Porto

Tue 10/20

12:25 pm-12:12 am

2 stops19h 47m

$798
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/28

6:15 am-10:30 am

2 stops21h 15m

Porto

Tue 11/3

5:00 am-11:45 am

1 stop14h 45m

$807

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 10/6

11:30 am-4:00 pm

2 stops20h 30m

Porto

Tue 10/13

8:40 pm-10:59 pm

2 stops34h 19m

$809

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 10/6

11:10 am-7:00 am

1 stop35h 50m

Porto

Tue 10/20

6:20 am-7:00 pm

1 stop20h 40m

$812

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/10

4:30 pm-9:20 pm

2 stops20h 50m

Porto

Tue 8/25

6:35 pm-2:35 pm

2 stops28h 00m

$818

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 typical price of a round-trip flight between San Francisco and Porto?

What is the cheapest month to fly to Porto?

The month of February is, on average, the cheapest month to fly to Porto from San Francisco, with most prices found around $578. If you aren’t able to travel during the month of February, then book flights to Porto from San Francisco during March instead. Flights to Porto in March, while not as cheap as those in February, still average around $610.

How far in advance should I book a flight from San Francisco 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 $896 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 $742 on momondo.

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

As of May 2026, prices for San Francisco to Porto flights are approximately 9% 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

Fastest flight time

14h 30m

Direct flights

None
The fastest flight from San Francisco to Porto takes 14h 30m
There are no direct flights from San Francisco to Porto. There are no popular flight routes from San Francisco to Porto.
Search flight deals

Frequently asked questions about flying from San Francisco to Porto

  • How far is San Francisco to Porto by plane?

    Porto is 5565.0 mi away from San Francisco. Typically, this will take 14h 30m 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
TAP AIR PORTUGALPriceFrom $431Free CancellationRating
7.2
2,259 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,790 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,024 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
1,955 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,396 reviews
Search Turkish Airlines flights
IberiaPriceFrom $660Free CancellationRating
7.0
3,219 reviews
Search Iberia flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
9,747 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,522 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.9
8,434 reviews
Search Delta flights
Air CanadaPriceFrom $787Free CancellationRating
7.1
11,083 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
Aveiro
Braga
Matosinhos
Lamego
Chaves
Esposende
Pinhao
Guimarães
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Curia
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

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