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Cheap flights from San Francisco to Porto from $348

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 8/26. 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.
TAP AIR PORTUGAL Logo
4:20 pm - 7:00 pm
SFO
-
OPO
18h 40m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 2:35 pm
OPO
-
SFO
28h 35m
1 stop
$649TAP AIR PORTUGAL
Tue, Sep 22 - Tue, Sep 29
TAP AIR PORTUGAL Logo
4:30 pm - 6:55 pm
SFO
-
OPO
18h 25m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 2:05 pm
OPO
-
SFO
23h 35m
1 stop
$651TAP AIR PORTUGAL
Thu, Oct 1 - Sun, Oct 18
TAP AIR PORTUGAL Logo
4:30 pm - 3:00 pm
SFO
-
OPO
14h 30m
1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 5:35 pm
OPO
-
SFO
28h 20m
1 stop
$653TAP AIR PORTUGAL
Thu, Aug 6 - Fri, Aug 21
TAP AIR PORTUGAL Logo
4:30 pm - 6:55 pm
SFO
-
OPO
18h 25m
1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 5:35 pm
OPO
-
SFO
28h 20m
1 stop
$655TAP AIR PORTUGAL
Thu, Aug 6 - Fri, Aug 21
TAP AIR PORTUGAL Logo
4:30 pm - 5:00 pm
SFO
-
OPO
16h 30m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 1:35 pm
OPO
-
SFO
27h 35m
1 stop
$656TAP AIR PORTUGAL
Mon, Sep 14 - Mon, Sep 21
TAP AIR PORTUGAL Logo
4:30 pm - 6:55 pm
SFO
-
OPO
18h 25m
1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 5:35 pm
OPO
-
SFO
28h 20m
1 stop
$657TAP AIR PORTUGAL
Thu, Aug 6 - Fri, Aug 21
TAP AIR PORTUGAL Logo
4:30 pm - 6:55 pm
SFO
-
OPO
18h 25m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 2:05 pm
OPO
-
SFO
23h 35m
1 stop
$658TAP AIR PORTUGAL
Thu, Oct 1 - Sun, Oct 18
TAP AIR PORTUGAL Logo
4:30 pm - 12:40 am
SFO
-
OPO
24h 10m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 5:35 pm
OPO
-
SFO
27h 05m
1 stop
$663TAP AIR PORTUGAL
Thu, Aug 6 - Fri, Aug 21
TAP AIR PORTUGAL Logo
4:35 pm - 9:10 am
SFO
-
OPO
32h 35m
1 stop
TAP AIR PORTUGAL Logo
7:00 am - 2:30 pm
OPO
-
SFO
15h 30m
1 stop
$667TAP AIR PORTUGAL
Wed, Oct 7 - Thu, Oct 15
TAP AIR PORTUGAL Logo
4:35 pm - 8:25 pm
SFO
-
OPO
19h 50m
1 stop
TAP AIR PORTUGAL Logo
10:30 pm - 2:35 pm
OPO
-
SFO
24h 05m
1 stop
$668TAP AIR PORTUGAL
Wed, Sep 9 - Tue, Oct 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 22
SFO11:59 pmSan Francisco
25h 31m
1 stop
OPO9:30 amPorto
Dec 1
OPO6:00 amPorto
18h 05m
1 stop
SFO4:05 pmSan Francisco
$770
United Airlines
Nov 21
SFO9:30 pmSan Francisco
28h 00m
2 stops
OPO9:30 amPorto
Dec 1
OPO6:00 amPorto
22h 10m
1 stop
SFO8:10 pmSan Francisco
$780
United Airlines
Nov 21
SFO9:16 pmSan Francisco
28h 14m
2 stops
OPO9:30 amPorto
Dec 1
OPO6:00 amPorto
22h 10m
1 stop
SFO8:10 pmSan Francisco
$786

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 22
SFO4:20 pmSan Francisco
18h 40m
1 stop
OPO7:00 pmPorto
Sep 29
OPO6:00 pmPorto
28h 35m
1 stop
SFO2:35 pmSan Francisco
$649
TAP AIR PORTUGAL
Oct 1
SFO4:30 pmSan Francisco
18h 25m
1 stop
OPO6:55 pmPorto
Oct 18
OPO10:30 pmPorto
23h 35m
1 stop
SFO2:05 pmSan Francisco
$651
TAP AIR PORTUGAL
Aug 6
SFO4:30 pmSan Francisco
14h 30m
1 stop
OPO3:00 pmPorto
Aug 21
OPO9:15 pmPorto
28h 20m
1 stop
SFO5:35 pmSan Francisco
$653

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 21, 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 9/22

4:20 pm-7:00 pm

1 stop18h 40m

Porto

Tue 9/29

6:00 pm-2:35 pm

1 stop28h 35m

$649
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 10/1

4:30 pm-6:55 pm

1 stop18h 25m

Porto

Sun 10/18

10:30 pm-2:05 pm

1 stop23h 35m

$651

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 8/6

4:30 pm-3:00 pm

1 stop14h 30m

Porto

Fri 8/21

9:15 pm-5:35 pm

1 stop28h 20m

$653

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 8/6

4:30 pm-6:55 pm

1 stop18h 25m

Porto

Fri 8/21

9:15 pm-5:35 pm

1 stop28h 20m

$655

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 9/14

4:30 pm-5:00 pm

1 stop16h 30m

Porto

Mon 9/21

6:00 pm-1:35 pm

1 stop27h 35m

$656

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 8/6

4:30 pm-6:55 pm

1 stop18h 25m

Porto

Fri 8/21

9:15 pm-5:35 pm

1 stop28h 20m

$657

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 10/1

4:30 pm-6:55 pm

1 stop18h 25m

Porto

Sun 10/18

10:30 pm-2:05 pm

1 stop23h 35m

$658

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 8/6

4:30 pm-12:40 am

1 stop24h 10m

Porto

Fri 8/21

10:30 pm-5:35 pm

1 stop27h 05m

$663

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/7

4:35 pm-9:10 am

1 stop32h 35m

Porto

Thu 10/15

7:00 am-2:30 pm

1 stop15h 30m

$667

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 9/9

4:35 pm-8:25 pm

1 stop19h 50m

Porto

Tue 10/6

10:30 pm-2:35 pm

1 stop24h 05m

$668

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 March is, on average, the cheapest month to fly to Porto from San Francisco, with most prices found around $612. If you aren’t able to travel during the month of March, then book flights to Porto from San Francisco during February instead. Flights to Porto in February, while not as cheap as those in March, still average around $625.

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 $906 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 $716 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 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
2,342 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,891 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,152 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
2,012 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,450 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $664Free CancellationRating
7.4
10,011 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,543 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.8
8,473 reviews
Search Delta flights
Air FrancePriceFrom $855Free CancellationRating
7.5
1,628 reviews
Search Air France flights
Air CanadaPriceFrom $860Free CancellationRating
7.1
11,363 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
Pinhao
Chaves
Arcos de Valdevez
Guimarães
Viseu
Espinho
Ponte de Lima
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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