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Cheap flights from San Francisco to Porto from $313

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 10/10. 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.
Multiple Airlines Logo
7:25 pm - 11:15 amSFO  San Francisco-OPO Porto
31h 50m1 stop Zurich
Multiple Airlines Logo
6:00 am - 4:06 pmOPO  Porto-SFO San Francisco
18h 06m2 stops Frankfurt am Main Vancouver Intl
$723Multiple Airlines
Mon, Nov 9 - Fri, Nov 20
Multiple Airlines Logo
8:25 am - 12:50 pmSFO  San Francisco-OPO Porto
20h 25m2 stops Montreal Pierre Elliott Trudeau Intl Munich Franz Josef Strauss
Multiple Airlines Logo
6:15 am - 7:35 pmOPO  Porto-SFO San Francisco
21h 20m1 stop Munich Franz Josef Strauss
$723Multiple Airlines
Mon, Nov 16 - Fri, Nov 27
United Airlines Logo
10:55 pm - 9:30 amSFO  San Francisco-OPO Porto
26h 35m2 stops Washington, D.C. Dulles Intl Newark
United Airlines Logo
6:00 am - 4:05 pmOPO  Porto-SFO San Francisco
18h 05m1 stop Frankfurt am Main
$745United Airlines
Mon, Dec 7 - Fri, Dec 11
United Airlines Logo
2:45 pm - 3:20 pmSFO  San Francisco-OPO Porto
16h 35m1 stop Frankfurt am Main
United Airlines Logo
6:00 am - 8:10 pmOPO  Porto-SFO San Francisco
22h 10m1 stop Frankfurt am Main
$756United Airlines
Mon, Jan 25 - Fri, Jan 29
Air Canada Logo
8:25 am - 11:15 amSFO  San Francisco-OPO Porto
42h 50m2 stops Montreal Pierre Elliott Trudeau Intl Zurich
Air Canada Logo
6:00 am - 8:14 pmOPO  Porto-SFO San Francisco
46h 14m2 stops Frankfurt am Main Toronto Pearson Intl
$756Air Canada
Mon, Jan 25 - Fri, Jan 29
SWISS Logo
7:25 pm - 11:15 amSFO  San Francisco-OPO Porto
31h 50m1 stop Zurich
SWISS Logo
12:05 pm - 4:30 pmOPO  Porto-SFO San Francisco
36h 25m1 stop Zurich
$760SWISS
Tue, Nov 24 - Mon, Nov 30
TAP AIR PORTUGAL Logo
4:30 pm - 12:40 amSFO  San Francisco-OPO Porto
24h 10m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
5:05 am - 2:35 pmOPO  Porto-SFO San Francisco
17h 30m1 stop Lisbon Humberto Delgado
$784TAP AIR PORTUGAL
Thu, Sep 17 - Wed, Sep 30
TAP AIR PORTUGAL Logo
7:35 pm - 12:40 amSFO  San Francisco-OPO Porto
21h 05m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
11:50 pm - 1:35 pmOPO  Porto-SFO San Francisco
21h 45m1 stop Lisbon Humberto Delgado
$784TAP AIR PORTUGAL
Sat, Sep 19 - Mon, Oct 5
Air Canada Logo
8:25 am - 12:00 pmSFO  San Francisco-OPO Porto
19h 35m2 stops Montreal Pierre Elliott Trudeau Intl Brussels Bruxelles-National
Air Canada Logo
6:00 am - 4:06 pmOPO  Porto-SFO San Francisco
18h 06m2 stops Frankfurt am Main Vancouver Intl
$798Air Canada
Thu, Nov 12 - Tue, Nov 24
SWISS Logo
7:35 pm - 11:25 amSFO  San Francisco-OPO Porto
55h 50m2 stops Vancouver Intl Zurich
SWISS Logo
8:40 am - 3:21 pmOPO  Porto-SFO San Francisco
38h 41m2 stops Zurich Vancouver Intl
$847SWISS
Sun, Oct 4 - Thu, Oct 15

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Air Canada flights from San Francisco to Porto

Our best Air Canada deals on San Francisco to Porto flight tickets
Air Canada
Oct 19
SFO4:35 pmSan Francisco
30h 25m
2 stops
OPO7:00 amPorto
Oct 29
OPO6:00 amPorto
22h 30m
2 stops
SFO9:30 pmSan Francisco
$826
Air Canada
Aug 8
SFO10:47 pmSan Francisco
48h 13m
2 stops
OPO7:00 amPorto
Aug 13
OPO6:00 amPorto
20h 32m
2 stops
SFO6:32 pmSan Francisco
$1,457
Air Canada
Aug 8
SFO4:40 pmSan Francisco
54h 20m
2 stops
OPO7:00 amPorto
Aug 12
OPO11:20 amPorto
32h 51m
2 stops
SFO12:11 pmSan Francisco
$1,466

United Airlines flights from San Francisco to Porto

Our best United Airlines deals on San Francisco to Porto flight tickets
United Airlines
Dec 7
SFO10:55 pmSan Francisco
26h 35m
2 stops
OPO9:30 amPorto
Dec 11
OPO6:00 amPorto
18h 05m
1 stop
SFO4:05 pmSan Francisco
$745
United Airlines
Jan 25
SFO2:45 pmSan Francisco
16h 35m
1 stop
OPO3:20 pmPorto
Jan 29
OPO6:00 amPorto
22h 10m
1 stop
SFO8:10 pmSan Francisco
$756
United Airlines
Dec 7
SFO5:00 amSan Francisco
20h 30m
2 stops
OPO9:30 amPorto
Dec 11
OPO12:35 pmPorto
19h 32m
2 stops
SFO12:07 amSan Francisco
$765

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 August 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 San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 11/9

7:25 pm-11:15 am

1 stop31h 50m

Porto

Fri 11/20

6:00 am-4:06 pm

2 stops18h 06m

$723

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 11/16

8:25 am-12:50 pm

2 stops20h 25m

Porto

Fri 11/27

6:15 am-7:35 pm

1 stop21h 20m

$723

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 12/7

10:55 pm-9:30 am

2 stops26h 35m

Porto

Fri 12/11

6:00 am-4:05 pm

1 stop18h 05m

$745

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 1/25

2:45 pm-3:20 pm

1 stop16h 35m

Porto

Fri 1/29

6:00 am-8:10 pm

1 stop22h 10m

$756

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Mon 1/25

8:25 am-11:15 am

2 stops42h 50m

Porto

Fri 1/29

6:00 am-8:14 pm

2 stops46h 14m

$756

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Tue 11/24

7:25 pm-11:15 am

1 stop31h 50m

Porto

Mon 11/30

12:05 pm-4:30 pm

1 stop36h 25m

$760

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Thu 9/17

4:30 pm-12:40 am

1 stop24h 10m

Porto

Wed 9/30

5:05 am-2:35 pm

1 stop17h 30m

$784

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Sat 9/19

7:35 pm-12:40 am

1 stop21h 05m

Porto

Mon 10/5

11:50 pm-1:35 pm

1 stop21h 45m

$784
Quickest round-trip

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Thu 11/12

8:25 am-12:00 pm

2 stops19h 35m

Porto

Tue 11/24

6:00 am-4:06 pm

2 stops18h 06m

$798

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Sun 10/4

7:35 pm-11:25 am

2 stops55h 50m

Porto

Thu 10/15

8:40 am-3:21 pm

2 stops38h 41m

$847

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?

Prices are currently low for flights on this route.

Typical prices usually range from $905 to $1,260.
The lowest price recently found on this route was $723.

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 $917 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 August 2026, prices for San Francisco to Porto flights are approximately 23% more expensive 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
2,358 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,925 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,178 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
2,028 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,468 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
10,075 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,555 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.8
8,496 reviews
Search Delta flights
Air FrancePriceFrom $855Free CancellationRating
7.5
1,637 reviews
Search Air France flights
Air CanadaPriceFrom $860Free CancellationRating
7.1
11,432 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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