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Cheap flights from San Francisco to Porto from $355

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 10/4. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

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
4:45 pm - 7:30 pm
SFO
-
OPO
18h 45m
1 stop
Scandinavian Airlines Logo
5:55 pm - 2:40 pm
OPO
-
SFO
28h 45m
1 stop
$616Scandinavian Airlines
Sat, Aug 15 - Fri, Aug 28
TAP AIR PORTUGAL Logo
4:30 pm - 3:00 pm
SFO
-
OPO
14h 30m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 1:35 pm
OPO
-
SFO
23h 05m
1 stop
$642TAP AIR PORTUGAL
Mon, Oct 5 - Mon, Oct 19
TAP AIR PORTUGAL Logo
4:30 pm - 5:00 pm
SFO
-
OPO
16h 30m
1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 2:35 pm
OPO
-
SFO
25h 20m
1 stop
$643TAP AIR PORTUGAL
Thu, Sep 17 - Tue, Sep 22
TAP AIR PORTUGAL Logo
4:20 pm - 5:00 pm
SFO
-
OPO
16h 40m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 2:05 pm
OPO
-
SFO
28h 05m
1 stop
$644TAP AIR PORTUGAL
Tue, Sep 22 - Sun, Sep 27
Scandinavian Airlines Logo
4:45 pm - 11:10 am
SFO
-
OPO
34h 25m
1 stop
Scandinavian Airlines Logo
5:50 pm - 2:50 pm
OPO
-
SFO
29h 00m
1 stop
$651Scandinavian Airlines
Thu, Nov 5 - Thu, Nov 19
TAP AIR PORTUGAL Logo
7:20 pm - 12:40 am
SFO
-
OPO
21h 20m
1 stop
TAP AIR PORTUGAL Logo
7:00 am - 2:30 pm
OPO
-
SFO
15h 30m
1 stop
$658TAP AIR PORTUGAL
Tue, Sep 1 - Thu, Sep 17
TAP AIR PORTUGAL Logo
7:20 pm - 12:40 am
SFO
-
OPO
21h 20m
2 stops
TAP AIR PORTUGAL Logo
10:30 pm - 2:05 pm
OPO
-
SFO
23h 35m
1 stop
$661TAP AIR PORTUGAL
Tue, Sep 1 - Sun, Sep 6
TAP AIR PORTUGAL Logo
7:20 pm - 12:40 am
SFO
-
OPO
21h 20m
2 stops
TAP AIR PORTUGAL Logo
10:30 pm - 2:35 pm
OPO
-
SFO
24h 05m
1 stop
$662TAP AIR PORTUGAL
Tue, Sep 1 - Tue, Sep 8
TAP AIR PORTUGAL Logo
7:20 pm - 12:40 am
SFO
-
OPO
21h 20m
2 stops
TAP AIR PORTUGAL Logo
5:05 am - 2:35 pm
OPO
-
SFO
17h 30m
1 stop
$663TAP AIR PORTUGAL
Tue, Sep 1 - Wed, Sep 30
TAP AIR PORTUGAL Logo
7:20 pm - 12:40 am
SFO
-
OPO
21h 20m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 2:05 pm
OPO
-
SFO
23h 35m
1 stop
$667TAP AIR PORTUGAL
Tue, Sep 1 - Sun, Sep 6

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United Airlines flights from San Francisco to Porto

Our best United Airlines deals on San Francisco to Porto flight tickets
United Airlines
Nov 3
SFO7:00 amSan Francisco
18h 30m
1 stop
OPO9:30 amPorto
Nov 19
OPO12:35 pmPorto
15h 35m
1 stop
SFO8:10 pmSan Francisco
$741
United Airlines
Nov 2
SFO11:30 pmSan Francisco
26h 00m
2 stops
OPO9:30 amPorto
Nov 19
OPO12:35 pmPorto
15h 35m
1 stop
SFO8:10 pmSan Francisco
$745
United Airlines
Jul 13
SFO9:15 pmSan Francisco
25h 00m
1 stop
OPO6:15 amPorto
Jul 25
OPO11:20 amPorto
32h 01m
1 stop
SFO11:21 amSan Francisco
$1,114

Delta flights from San Francisco to Porto

Our best Delta deals on San Francisco to Porto flight tickets
Delta
Nov 4
SFO11:30 amSan Francisco
13h 35m
1 stop
OPO9:05 amPorto
Nov 17
OPO11:15 amPorto
32h 30m
1 stop
SFO11:45 amSan Francisco
$743
Delta
Nov 2
SFO6:00 amSan Francisco
32h 00m
2 stops
OPO10:00 pmPorto
Nov 17
OPO11:15 amPorto
32h 30m
1 stop
SFO11:45 amSan Francisco
$747
Delta
Nov 3
SFO9:00 pmSan Francisco
28h 05m
1 stop
OPO9:05 amPorto
Nov 13
OPO5:00 amPorto
14h 45m
1 stop
SFO11:45 amSan Francisco
$754

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 July 9, 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

Sat 8/15

4:45 pm-7:30 pm

1 stop18h 45m

Porto

Fri 8/28

5:55 pm-2:40 pm

1 stop28h 45m

$616

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 10/5

4:30 pm-3:00 pm

1 stop14h 30m

Porto

Mon 10/19

10:30 pm-1:35 pm

1 stop23h 05m

$642

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 9/17

4:30 pm-5:00 pm

1 stop16h 30m

Porto

Tue 9/22

9:15 pm-2:35 pm

1 stop25h 20m

$643

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/22

4:20 pm-5:00 pm

1 stop16h 40m

Porto

Sun 9/27

6:00 pm-2:05 pm

1 stop28h 05m

$644

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 11/5

4:45 pm-11:10 am

1 stop34h 25m

Porto

Thu 11/19

5:50 pm-2:50 pm

1 stop29h 00m

$651
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/1

7:20 pm-12:40 am

1 stop21h 20m

Porto

Thu 9/17

7:00 am-2:30 pm

1 stop15h 30m

$658

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/1

7:20 pm-12:40 am

2 stops21h 20m

Porto

Sun 9/6

10:30 pm-2:05 pm

1 stop23h 35m

$661

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/1

7:20 pm-12:40 am

2 stops21h 20m

Porto

Tue 9/8

10:30 pm-2:35 pm

1 stop24h 05m

$662

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/1

7:20 pm-12:40 am

2 stops21h 20m

Porto

Wed 9/30

5:05 am-2:35 pm

1 stop17h 30m

$663

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/1

7:20 pm-12:40 am

1 stop21h 20m

Porto

Sun 9/6

10:30 pm-2:05 pm

1 stop23h 35m

$667

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 $588. 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 $609.

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 $735 on momondo.

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

As of July 2026, prices for San Francisco to Porto flights are approximately 8% 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
2,326 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,874 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,127 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
1,993 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,441 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $664Free CancellationRating
7.4
9,959 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,533 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.8
8,454 reviews
Search Delta flights
Air CanadaPriceFrom $788Free CancellationRating
7.1
11,322 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
Esposende
Lamego
Chaves
Pinhao
Arcos de Valdevez
Guimarães
Espinho
Ponte de Lima
Viseu
Curia
Mesao Frio
Penafiel
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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