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Cheap flights from San Francisco to Porto from $375

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.
Iberia Logo
5:30 pm - 8:00 pm
SFO
-
OPO
18h 30m
2 stops
Iberia Logo
9:55 pm - 6:45 pm
OPO
-
SFO
28h 50m
2 stops
$770Iberia
Mon, Nov 9 - Mon, Nov 16
Iberia Logo
7:54 am - 11:45 am
SFO
-
OPO
19h 51m
2 stops
Iberia Logo
8:40 pm - 9:26 pm
OPO
-
SFO
31h 46m
2 stops
$792Iberia
Wed, Oct 21 - Mon, Oct 26
Iberia Logo
5:55 pm - 8:00 pm
SFO
-
OPO
18h 05m
1 stop
Iberia Logo
8:20 am - 9:54 pm
OPO
-
SFO
21h 34m
2 stops
$794Iberia
Tue, Sep 22 - Tue, Sep 29
American Airlines Logo
1:27 pm - 4:00 pm
SFO
-
OPO
18h 33m
2 stops
American Airlines Logo
8:20 am - 7:28 pm
OPO
-
SFO
19h 08m
2 stops
$798American Airlines
Tue, Sep 22 - Tue, Oct 6
Scandinavian Airlines Logo
7:00 am - 5:45 pm
SFO
-
OPO
26h 45m
2 stops
Scandinavian Airlines Logo
5:50 pm - 1:13 am
OPO
-
SFO
39h 23m
2 stops
$799Scandinavian Airlines
Sat, Oct 24 - Thu, Nov 5
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
$803Lufthansa
Mon, Aug 3 - Wed, Aug 19
Air Canada Logo
8:10 am - 7:00 am
SFO
-
OPO
14h 50m
1 stop
Air Canada Logo
11:20 am - 12:07 am
OPO
-
SFO
20h 47m
2 stops
$810Air Canada
Mon, Aug 3 - Wed, Aug 19
KLM Logo
7:00 am - 10:30 am
SFO
-
OPO
19h 30m
2 stops
KLM Logo
11:15 am - 11:45 am
OPO
-
SFO
32h 30m
1 stop
$812KLM
Mon, Nov 9 - Mon, Nov 16
Scandinavian Airlines Logo
4:45 pm - 5:05 pm
SFO
-
OPO
16h 20m
1 stop
Scandinavian Airlines Logo
12:00 pm - 3:50 pm
OPO
-
SFO
34h 50m
1 stop
$813Scandinavian Airlines
Thu, Oct 8 - Sat, Oct 31
Delta Logo
10:45 pm - 8:05 am
SFO
-
OPO
26h 20m
1 stop
Delta Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
$814Delta
Sat, Oct 24 - Thu, Nov 5

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Delta flights from San Francisco to Porto

Our best Delta deals on San Francisco to Porto flight tickets
Delta
Oct 24
SFO10:45 pmSan Francisco
26h 20m
1 stop
OPO8:05 amPorto
Nov 5
OPO5:00 amPorto
14h 45m
1 stop
SFO11:45 amSan Francisco
$814
Delta
Aug 2
SFO1:00 pmSan Francisco
25h 00m
2 stops
OPO10:00 pmPorto
Aug 25
OPO11:35 amPorto
32h 10m
1 stop
SFO11:45 amSan Francisco
$841
Delta
Aug 16
SFO6:00 amSan Francisco
20h 25m
2 stops
OPO10:25 amPorto
Aug 24
OPO11:25 amPorto
32h 20m
1 stop
SFO11:45 amSan Francisco
$842

Scandinavian Airlines flights from San Francisco to Porto

Our best Scandinavian Airlines deals on San Francisco to Porto flight tickets
Scandinavian Airlines
Nov 7
SFO4:45 pmSan Francisco
34h 20m
1 stop
OPO11:05 amPorto
Nov 16
OPO11:55 amPorto
34h 55m
1 stop
SFO2:50 pmSan Francisco
$745
Scandinavian Airlines
Oct 24
SFO7:00 amSan Francisco
26h 45m
2 stops
OPO5:45 pmPorto
Nov 5
OPO5:50 pmPorto
39h 23m
2 stops
SFO1:13 amSan Francisco
$799
Scandinavian Airlines
Oct 8
SFO4:45 pmSan Francisco
16h 20m
1 stop
OPO5:05 pmPorto
Oct 31
OPO12:00 pmPorto
34h 50m
1 stop
SFO3:50 pmSan Francisco
$813

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 10, 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

Mon 11/9

5:30 pm-8:00 pm

2 stops18h 30m

Porto

Mon 11/16

9:55 pm-6:45 pm

2 stops28h 50m

$770

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/21

7:54 am-11:45 am

2 stops19h 51m

Porto

Mon 10/26

8:40 pm-9:26 pm

2 stops31h 46m

$792

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/22

5:55 pm-8:00 pm

1 stop18h 05m

Porto

Tue 9/29

8:20 am-9:54 pm

2 stops21h 34m

$794

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/22

1:27 pm-4:00 pm

2 stops18h 33m

Porto

Tue 10/6

8:20 am-7:28 pm

2 stops19h 08m

$798

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 10/24

7:00 am-5:45 pm

2 stops26h 45m

Porto

Thu 11/5

5:50 pm-1:13 am

2 stops39h 23m

$799
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/3

9:05 pm-11:25 pm

1 stop18h 20m

Porto

Wed 8/19

11:05 am-7:00 pm

1 stop15h 55m

$803

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/3

8:10 am-7:00 am

1 stop14h 50m

Porto

Wed 8/19

11:20 am-12:07 am

2 stops20h 47m

$810

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 11/9

7:00 am-10:30 am

2 stops19h 30m

Porto

Mon 11/16

11:15 am-11:45 am

1 stop32h 30m

$812

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 10/8

4:45 pm-5:05 pm

1 stop16h 20m

Porto

Sat 10/31

12:00 pm-3:50 pm

1 stop34h 50m

$813

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 10/24

10:45 pm-8:05 am

1 stop26h 20m

Porto

Thu 11/5

5:00 am-11:45 am

1 stop14h 45m

$814

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 $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 $900 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 $722 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

15h 30m

Direct flights

None
The fastest flight from San Francisco to Porto takes 15h 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 15h 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
2,274 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,815 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,052 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
1,968 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,408 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
9,809 reviews
Search United Airlines flights
IberiaPriceFrom $676Free CancellationRating
7.0
3,232 reviews
Search Iberia flights
KLMPriceFrom $683Free CancellationRating
7.8
1,527 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.9
8,399 reviews
Search Delta flights
Air CanadaPriceFrom $787Free CancellationRating
7.1
11,159 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.

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