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Cheap flights from San Francisco to Porto from $309

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 10/17. 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
4:30 pm - 11:00 pm
SFO
-
OPO
22h 30m
1 stop
TAP AIR PORTUGAL Logo
6:00 pm - 2:30 pm
OPO
-
SFO
28h 30m
1 stop
$654TAP AIR PORTUGAL
Thu, Aug 13 - Wed, Aug 26
TAP AIR PORTUGAL Logo
4:20 pm - 5:00 pm
SFO
-
OPO
16h 40m
1 stop
TAP AIR PORTUGAL Logo
9:15 pm - 2:35 pm
OPO
-
SFO
25h 20m
1 stop
$656TAP AIR PORTUGAL
Tue, Sep 22 - Tue, Sep 29
Scandinavian Airlines Logo
4:45 pm - 11:10 am
SFO
-
OPO
34h 25m
1 stop
Scandinavian Airlines Logo
11:55 am - 2:50 pm
OPO
-
SFO
34h 55m
1 stop
$691Scandinavian Airlines
Thu, Nov 5 - Wed, Nov 18
Multiple Airlines Logo
4:35 pm - 11:50 pm
SFO
-
OPO
23h 15m
2 stops
Multiple Airlines Logo
2:40 pm - 2:30 pm
OPO
-
SFO
31h 50m
2 stops
$732Multiple Airlines
Wed, Sep 16 - Wed, Sep 23
Multiple Airlines Logo
4:35 pm - 11:50 pm
SFO
-
OPO
23h 15m
2 stops
Multiple Airlines Logo
2:00 pm - 2:35 pm
OPO
-
SFO
32h 35m
2 stops
$740Multiple Airlines
Wed, Sep 23 - Tue, Oct 6
SWISS Logo
7:25 pm - 11:15 am
SFO
-
OPO
31h 50m
1 stop
SWISS Logo
12:05 pm - 4:30 pm
OPO
-
SFO
36h 25m
1 stop
$749SWISS
Mon, Nov 2 - Mon, Feb 1
Delta Logo
6:00 am - 10:35 am
SFO
-
OPO
20h 35m
2 stops
Delta Logo
5:00 am - 6:48 pm
OPO
-
SFO
21h 48m
2 stops
$761Delta
Wed, Nov 18 - Thu, Nov 26
Delta Logo
7:00 am - 10:35 am
SFO
-
OPO
19h 35m
2 stops
Delta Logo
5:00 am - 5:03 pm
OPO
-
SFO
20h 03m
2 stops
$761Delta
Wed, Nov 18 - Wed, Nov 25
SWISS Logo
7:25 pm - 11:15 am
SFO
-
OPO
31h 50m
1 stop
SWISS Logo
8:40 am - 4:30 pm
OPO
-
SFO
15h 50m
1 stop
$795SWISS
Sun, Nov 1 - Sat, Nov 14
Scandinavian Airlines Logo
4:45 pm - 11:00 am
SFO
-
OPO
34h 15m
1 stop
Scandinavian Airlines Logo
5:55 pm - 8:19 pm
OPO
-
SFO
34h 24m
2 stops
$837Scandinavian Airlines
Mon, Aug 17 - Fri, Aug 21

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Delta flights from San Francisco to Porto

Our best Delta deals on San Francisco to Porto flight tickets
Delta
Nov 18
SFO7:00 amSan Francisco
19h 35m
2 stops
OPO10:35 amPorto
Nov 25
OPO5:00 amPorto
20h 03m
2 stops
SFO5:03 pmSan Francisco
$761
Delta
Aug 10
SFO7:00 amSan Francisco
17h 30m
2 stops
OPO8:30 amPorto
Aug 22
OPO5:00 amPorto
22h 43m
2 stops
SFO7:43 pmSan Francisco
$1,011
Delta
Jul 28
SFO3:05 pmSan Francisco
23h 00m
1 stop
OPO10:05 pmPorto
Aug 18
OPO5:00 amPorto
14h 45m
1 stop
SFO11:45 amSan Francisco
$1,048

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
Aug 13
SFO4:30 pmSan Francisco
22h 30m
1 stop
OPO11:00 pmPorto
Aug 26
OPO6:00 pmPorto
28h 30m
1 stop
SFO2:30 pmSan Francisco
$654
TAP AIR PORTUGAL
Sep 22
SFO4:20 pmSan Francisco
16h 40m
1 stop
OPO5:00 pmPorto
Sep 29
OPO9:15 pmPorto
25h 20m
1 stop
SFO2:35 pmSan Francisco
$656
TAP AIR PORTUGAL
Oct 1
SFO4:30 pmSan Francisco
16h 30m
1 stop
OPO5:00 pmPorto
Oct 19
OPO9:15 pmPorto
24h 20m
1 stop
SFO1:35 pmSan Francisco
$658

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 27, 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

Thu 8/13

4:30 pm-11:00 pm

1 stop22h 30m

Porto

Wed 8/26

6:00 pm-2:30 pm

1 stop28h 30m

$654

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/22

4:20 pm-5:00 pm

1 stop16h 40m

Porto

Tue 9/29

9:15 pm-2:35 pm

1 stop25h 20m

$656

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 11/5

4:45 pm-11:10 am

1 stop34h 25m

Porto

Wed 11/18

11:55 am-2:50 pm

1 stop34h 55m

$691

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 9/16

4:35 pm-11:50 pm

2 stops23h 15m

Porto

Wed 9/23

2:40 pm-2:30 pm

2 stops31h 50m

$732

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 9/23

4:35 pm-11:50 pm

2 stops23h 15m

Porto

Tue 10/6

2:00 pm-2:35 pm

2 stops32h 35m

$740

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 11/2

7:25 pm-11:15 am

1 stop31h 50m

Porto

Mon 2/1

12:05 pm-4:30 pm

1 stop36h 25m

$749

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 11/18

6:00 am-10:35 am

2 stops20h 35m

Porto

Thu 11/26

5:00 am-6:48 pm

2 stops21h 48m

$761
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 11/18

7:00 am-10:35 am

2 stops19h 35m

Porto

Wed 11/25

5:00 am-5:03 pm

2 stops20h 03m

$761

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 11/1

7:25 pm-11:15 am

1 stop31h 50m

Porto

Sat 11/14

8:40 am-4:30 pm

1 stop15h 50m

$795

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/17

4:45 pm-11:00 am

1 stop34h 15m

Porto

Fri 8/21

5:55 pm-8:19 pm

2 stops34h 24m

$837

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?

Prices are currently low for flights on this route.

Typical prices usually range from $902 to $1,260.
The lowest price recently found on this route was $654.

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

13h 45m

Direct flights

None
The fastest flight from San Francisco to Porto takes 13h 45m
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 13h 45m 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
2,347 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,904 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,159 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
2,017 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,451 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
10,041 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,550 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.8
8,482 reviews
Search Delta flights
Air FrancePriceFrom $855Free CancellationRating
7.5
1,627 reviews
Search Air France flights
Air CanadaPriceFrom $860Free CancellationRating
7.1
11,392 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
Pinhao
Esposende
Lamego
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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