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Cheap flights from San Francisco to Porto from $351

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 10/21. 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.
Multiple Airlines Logo
4:35 pm - 7:20 pm
SFO
-
OPO
18h 45m
2 stops
Multiple Airlines Logo
2:40 pm - 2:30 pm
OPO
-
SFO
31h 50m
2 stops
$766Multiple Airlines
Wed, Aug 12 - Wed, Aug 26
Multiple Airlines Logo
8:10 am - 7:00 am
SFO
-
OPO
14h 50m
1 stop
Multiple Airlines Logo
6:20 am - 7:00 pm
OPO
-
SFO
20h 40m
1 stop
$822Multiple Airlines
Mon, Aug 17 - Wed, Aug 26
Lufthansa Logo
9:05 pm - 11:25 pm
SFO
-
OPO
18h 20m
1 stop
Lufthansa Logo
11:05 am - 7:00 pm
OPO
-
SFO
15h 55m
1 stop
$824Lufthansa
Mon, Aug 17 - Wed, Aug 26
Multiple Airlines Logo
8:10 am - 7:00 am
SFO
-
OPO
14h 50m
1 stop
Multiple Airlines Logo
12:15 pm - 12:07 am
OPO
-
SFO
19h 52m
2 stops
$827Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
8:10 am - 7:00 am
SFO
-
OPO
14h 50m
1 stop
Multiple Airlines Logo
11:20 am - 12:07 am
OPO
-
SFO
20h 47m
2 stops
$834Multiple Airlines
Wed, Aug 12 - Wed, Aug 26
KLM Logo
8:10 pm - 10:05 pm
SFO
-
OPO
17h 55m
1 stop
KLM Logo
6:50 pm - 11:45 am
OPO
-
SFO
24h 55m
1 stop
$837KLM
Tue, Jul 28 - Tue, Aug 18
Air Canada Logo
7:30 pm - 7:00 am
SFO
-
OPO
27h 30m
2 stops
Air Canada Logo
11:20 am - 12:07 am
OPO
-
SFO
20h 47m
2 stops
$847Air Canada
Mon, Aug 17 - Wed, Aug 26
Air Canada Logo
8:10 am - 7:00 am
SFO
-
OPO
14h 50m
1 stop
Air Canada Logo
11:20 am - 5:39 pm
OPO
-
SFO
38h 19m
2 stops
$850Air Canada
Wed, Aug 12 - Wed, Sep 2
Multiple Airlines Logo
4:45 pm - 11:55 pm
SFO
-
OPO
23h 10m
2 stops
Multiple Airlines Logo
10:55 am - 2:40 pm
OPO
-
SFO
35h 45m
2 stops
$853Multiple Airlines
Mon, Aug 31 - Mon, Sep 14
Multiple Airlines Logo
4:05 pm - 10:55 pm
SFO
-
OPO
22h 50m
1 stop
Multiple Airlines Logo
2:40 pm - 2:30 pm
OPO
-
SFO
31h 50m
2 stops
$857Multiple Airlines
Sat, Aug 22 - Wed, Sep 2

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 8
SFO7:20 pmSan Francisco
18h 20m
1 stop
OPO9:40 pmPorto
Sep 16
OPO9:15 pmPorto
25h 15m
1 stop
SFO2:30 pmSan Francisco
$846
TAP AIR PORTUGAL
Sep 8
SFO7:20 pmSan Francisco
18h 20m
1 stop
OPO9:40 pmPorto
Sep 16
OPO5:05 amPorto
17h 30m
1 stop
SFO2:35 pmSan Francisco
$847
TAP AIR PORTUGAL
Sep 8
SFO7:20 pmSan Francisco
17h 05m
2 stops
OPO8:25 pmPorto
Sep 16
OPO5:05 amPorto
17h 30m
1 stop
SFO2:35 pmSan Francisco
$865

American Airlines flights from San Francisco to Porto

Our best American Airlines deals on San Francisco to Porto flight tickets
American Airlines
Oct 5
SFO5:54 amSan Francisco
17h 46m
2 stops
OPO7:40 amPorto
Oct 15
OPO8:20 amPorto
22h 31m
2 stops
SFO10:51 pmSan Francisco
$798
American Airlines
Oct 5
SFO11:30 amSan Francisco
20h 30m
2 stops
OPO4:00 pmPorto
Oct 15
OPO8:20 amPorto
20h 12m
2 stops
SFO8:32 pmSan Francisco
$799
American Airlines
Oct 5
SFO10:29 amSan Francisco
17h 16m
2 stops
OPO11:45 amPorto
Oct 19
OPO8:20 amPorto
19h 08m
2 stops
SFO7:28 pmSan Francisco
$858

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 June 2, 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

Wed 8/12

4:35 pm-7:20 pm

2 stops18h 45m

Porto

Wed 8/26

2:40 pm-2:30 pm

2 stops31h 50m

$766

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/17

8:10 am-7:00 am

1 stop14h 50m

Porto

Wed 8/26

6:20 am-7:00 pm

1 stop20h 40m

$822
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/17

9:05 pm-11:25 pm

1 stop18h 20m

Porto

Wed 8/26

11:05 am-7:00 pm

1 stop15h 55m

$824

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/17

8:10 am-7:00 am

1 stop14h 50m

Porto

Tue 8/25

12:15 pm-12:07 am

2 stops19h 52m

$827

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 8/12

8:10 am-7:00 am

1 stop14h 50m

Porto

Wed 8/26

11:20 am-12:07 am

2 stops20h 47m

$834

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 7/28

8:10 pm-10:05 pm

1 stop17h 55m

Porto

Tue 8/18

6:50 pm-11:45 am

1 stop24h 55m

$837

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/17

7:30 pm-7:00 am

2 stops27h 30m

Porto

Wed 8/26

11:20 am-12:07 am

2 stops20h 47m

$847

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 8/12

8:10 am-7:00 am

1 stop14h 50m

Porto

Wed 9/2

11:20 am-5:39 pm

2 stops38h 19m

$850

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/31

4:45 pm-11:55 pm

2 stops23h 10m

Porto

Mon 9/14

10:55 am-2:40 pm

2 stops35h 45m

$853

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 8/22

4:05 pm-10:55 pm

1 stop22h 50m

Porto

Wed 9/2

2:40 pm-2:30 pm

2 stops31h 50m

$857

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 June 2026, prices for San Francisco to Porto flights are approximately 16% 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 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

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 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
TAP AIR PORTUGALPriceFrom $431Free CancellationRating
7.2
2,266 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,804 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,036 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
1,964 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,405 reviews
Search Turkish Airlines flights
IberiaPriceFrom $660Free CancellationRating
7.0
3,222 reviews
Search Iberia flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
9,771 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,524 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.9
8,398 reviews
Search Delta flights
Air CanadaPriceFrom $787Free CancellationRating
7.1
11,122 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
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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