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Cheap flights from San Francisco to Porto from $367

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 10/11. 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

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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
4:45 pm - 11:05 am
SFO
-
OPO
34h 20m
1 stop
Scandinavian Airlines Logo
11:55 am - 2:50 pm
OPO
-
SFO
34h 55m
1 stop
$676Scandinavian Airlines
Mon, Nov 9 - Mon, Nov 16
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
10:16 am - 8:00 pm
SFO
-
OPO
25h 44m
2 stops
Multiple Airlines Logo
8:40 pm - 12:43 am
OPO
-
SFO
36h 03m
2 stops
$775Multiple Airlines
Mon, Nov 9 - Mon, Nov 16
Iberia Logo
1:59 pm - 4:00 pm
SFO
-
OPO
18h 01m
2 stops
Iberia Logo
8:40 pm - 1:09 pm
OPO
-
SFO
23h 29m
2 stops
$781Iberia
Wed, Oct 21 - Wed, Oct 28
Iberia Logo
9:00 am - 11:45 am
SFO
-
OPO
18h 45m
2 stops
Iberia Logo
10:00 pm - 1:50 pm
OPO
-
SFO
23h 50m
2 stops
$789Iberia
Mon, Oct 5 - Thu, Oct 15
Scandinavian Airlines Logo
4:45 pm - 10:40 am
SFO
-
OPO
33h 55m
2 stops
Scandinavian Airlines Logo
11:55 am - 3:50 pm
OPO
-
SFO
34h 55m
1 stop
$795Scandinavian Airlines
Wed, Oct 21 - Wed, Oct 28
American Airlines Logo
9:00 am - 11:45 am
SFO
-
OPO
18h 45m
2 stops
American Airlines Logo
8:20 am - 10:51 pm
OPO
-
SFO
22h 31m
2 stops
$798American Airlines
Mon, Oct 5 - Thu, Oct 15
American Airlines Logo
11:30 am - 4:00 pm
SFO
-
OPO
20h 30m
2 stops
American Airlines Logo
8:20 am - 8:32 pm
OPO
-
SFO
20h 12m
2 stops
$799American Airlines
Mon, Oct 5 - Thu, Oct 15
Multiple Airlines Logo
3:40 pm - 10:00 pm
SFO
-
OPO
22h 20m
1 stop
Multiple Airlines Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
$803Multiple Airlines
Tue, Dec 1 - Tue, Dec 15
United Airlines Logo
5:00 am - 9:30 am
SFO
-
OPO
20h 30m
2 stops
United Airlines Logo
12:35 pm - 8:10 pm
OPO
-
SFO
15h 35m
1 stop
$806United Airlines
Tue, Dec 1 - Tue, Dec 15

SWISS flights from San Francisco to Porto

Our best SWISS deals on San Francisco to Porto flight tickets
SWISS
Nov 6
SFO7:25 pmSan Francisco
31h 50m
1 stop
OPO11:15 amPorto
Nov 15
OPO7:20 pmPorto
29h 10m
1 stop
SFO4:30 pmSan Francisco
$859
SWISS
Aug 6
SFO7:35 pmSan Francisco
14h 55m
1 stop
OPO6:30 pmPorto
Aug 20
OPO8:40 amPorto
15h 35m
1 stop
SFO4:15 pmSan Francisco
$883
SWISS
Sep 7
SFO7:35 pmSan Francisco
28h 20m
1 stop
OPO7:55 amPorto
Sep 14
OPO7:20 pmPorto
28h 55m
1 stop
SFO4:15 pmSan Francisco
$889

American Airlines flights from San Francisco to Porto

Our best American Airlines deals on San Francisco to Porto flight tickets
American Airlines
Oct 5
SFO10:29 amSan Francisco
17h 16m
2 stops
OPO11:45 amPorto
Oct 15
OPO8:20 amPorto
20h 12m
2 stops
SFO8:32 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
SFO7:54 amSan Francisco
19h 51m
2 stops
OPO11:45 amPorto
Oct 19
OPO8:20 amPorto
20h 35m
2 stops
SFO8:55 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 6, 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

4:45 pm-11:05 am

1 stop34h 20m

Porto

Mon 11/16

11:55 am-2:50 pm

1 stop34h 55m

$676

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 11/9

10:16 am-8:00 pm

2 stops25h 44m

Porto

Mon 11/16

8:40 pm-12:43 am

2 stops36h 03m

$775

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/21

1:59 pm-4:00 pm

2 stops18h 01m

Porto

Wed 10/28

8:40 pm-1:09 pm

2 stops23h 29m

$781

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 10/5

9:00 am-11:45 am

2 stops18h 45m

Porto

Thu 10/15

10:00 pm-1:50 pm

2 stops23h 50m

$789

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 10/21

4:45 pm-10:40 am

2 stops33h 55m

Porto

Wed 10/28

11:55 am-3:50 pm

1 stop34h 55m

$795

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 10/5

9:00 am-11:45 am

2 stops18h 45m

Porto

Thu 10/15

8:20 am-10:51 pm

2 stops22h 31m

$798

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 10/5

11:30 am-4:00 pm

2 stops20h 30m

Porto

Thu 10/15

8:20 am-8:32 pm

2 stops20h 12m

$799

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 12/1

3:40 pm-10:00 pm

1 stop22h 20m

Porto

Tue 12/15

5:00 am-11:45 am

1 stop14h 45m

$803
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 12/1

5:00 am-9:30 am

2 stops20h 30m

Porto

Tue 12/15

12:35 pm-8:10 pm

1 stop15h 35m

$806

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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
2,272 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.3
1,807 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,038 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
1,964 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,409 reviews
Search Turkish Airlines flights
IberiaPriceFrom $660Free CancellationRating
7.0
3,224 reviews
Search Iberia flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
9,778 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,525 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.8
8,397 reviews
Search Delta flights
Air CanadaPriceFrom $787Free CancellationRating
7.1
11,129 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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