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Cheap flights from San Francisco to Porto from $271

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 11/22. 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
4:30 pm - 8:00 amSFO  San Francisco-OPO Porto
31h 30m3 stops Frankfurt am Main Milan Malpensa Barcelona-El Prat
Multiple Airlines Logo
8:20 pm - 2:30 pmOPO  Porto-SFO San Francisco
26h 10m2 stops Milan Malpensa Frankfurt am Main
$711Multiple Airlines
Thu, Oct 15 - Thu, Oct 22
Multiple Airlines Logo
9:40 pm - 11:55 pmSFO  San Francisco-OPO Porto
18h 15m1 stop Munich Franz Josef Strauss
Multiple Airlines Logo
6:00 am - 8:32 pmOPO  Porto-SFO San Francisco
22h 32m2 stops Frankfurt am Main Vancouver Intl
$722Multiple Airlines
Wed, Feb 10 - Wed, Feb 17
Lufthansa Logo
2:45 pm - 3:20 pmSFO  San Francisco-OPO Porto
16h 35m1 stop Frankfurt am Main
Lufthansa Logo
6:15 am - 7:35 pmOPO  Porto-SFO San Francisco
21h 20m1 stop Munich Franz Josef Strauss
$735Lufthansa
Wed, Nov 18 - Fri, Nov 27
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
$740SWISS
Tue, Dec 1 - Thu, Dec 10
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
5:00 am - 9:30 amSFO  San Francisco-OPO Porto
20h 30m2 stops Denver Intl Newark
United Airlines Logo
6:00 am - 4:05 pmOPO  Porto-SFO San Francisco
18h 05m1 stop Frankfurt am Main
$746United Airlines
Mon, Dec 7 - Fri, Dec 11
Delta Logo
2:47 pm - 10:00 pmSFO  San Francisco-OPO Porto
23h 13m2 stops Los Angeles Paris Charles de Gaulle
Delta Logo
5:00 am - 6:11 pmOPO  Porto-SFO San Francisco
21h 11m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County
$757Delta
Tue, Dec 1 - Thu, Dec 10
Lufthansa Logo
9:40 pm - 11:55 pmSFO  San Francisco-OPO Porto
18h 15m1 stop Munich Franz Josef Strauss
Lufthansa Logo
6:15 am - 7:35 pmOPO  Porto-SFO San Francisco
21h 20m1 stop Munich Franz Josef Strauss
$789Lufthansa
Sat, Feb 13 - Fri, Feb 19
Delta Logo
4:15 pm - 10:00 pmSFO  San Francisco-OPO Porto
21h 45m2 stops Los Angeles Paris Charles de Gaulle
Delta Logo
5:00 am - 7:37 pmOPO  Porto-SFO San Francisco
22h 37m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
$807Delta
Sat, Feb 13 - Fri, Feb 19
SWISS Logo
7:35 pm - 7:55 amSFO  San Francisco-OPO Porto
28h 20m1 stop Zurich
SWISS Logo
12:15 pm - 4:15 pmOPO  Porto-SFO San Francisco
36h 00m1 stop Zurich
$824SWISS
Sun, Sep 20 - Tue, Oct 6

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Lufthansa flights from San Francisco to Porto

Our best Lufthansa deals on San Francisco to Porto flight tickets
Lufthansa
Nov 18
SFO2:45 pmSan Francisco
16h 35m
1 stop
OPO3:20 pmPorto
Nov 27
OPO6:15 amPorto
21h 20m
1 stop
SFO7:35 pmSan Francisco
$735
Lufthansa
Feb 13
SFO9:40 pmSan Francisco
18h 15m
1 stop
OPO11:55 pmPorto
Feb 19
OPO6:15 amPorto
21h 20m
1 stop
SFO7:35 pmSan Francisco
$789
Lufthansa
Nov 19
SFO9:40 pmSan Francisco
18h 15m
1 stop
OPO11:55 pmPorto
Nov 27
OPO6:15 amPorto
21h 20m
1 stop
SFO7:35 pmSan Francisco
$801

SWISS flights from San Francisco to Porto

Our best SWISS deals on San Francisco to Porto flight tickets
SWISS
Dec 1
SFO7:25 pmSan Francisco
31h 50m
1 stop
OPO11:15 amPorto
Dec 10
OPO12:05 pmPorto
36h 25m
1 stop
SFO4:30 pmSan Francisco
$740
SWISS
Aug 22
SFO7:30 pmSan Francisco
38h 45m
2 stops
OPO6:15 pmPorto
Aug 31
OPO8:05 pmPorto
28h 10m
2 stops
SFO4:15 pmSan Francisco
$1,104

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 17, 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

Thu 10/15

4:30 pm-8:00 am

3 stops31h 30m

Porto

Thu 10/22

8:20 pm-2:30 pm

2 stops26h 10m

$711

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Wed 2/10

9:40 pm-11:55 pm

1 stop18h 15m

Porto

Wed 2/17

6:00 am-8:32 pm

2 stops22h 32m

$722
Quickest round-trip

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Wed 11/18

2:45 pm-3:20 pm

1 stop16h 35m

Porto

Fri 11/27

6:15 am-7:35 pm

1 stop21h 20m

$735

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Tue 12/1

7:25 pm-11:15 am

1 stop31h 50m

Porto

Thu 12/10

12:05 pm-4:30 pm

1 stop36h 25m

$740

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 12/7

5:00 am-9:30 am

2 stops20h 30m

Porto

Fri 12/11

6:00 am-4:05 pm

1 stop18h 05m

$746

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Tue 12/1

2:47 pm-10:00 pm

2 stops23h 13m

Porto

Thu 12/10

5:00 am-6:11 pm

2 stops21h 11m

$757

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Sat 2/13

9:40 pm-11:55 pm

1 stop18h 15m

Porto

Fri 2/19

6:15 am-7:35 pm

1 stop21h 20m

$789

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Sat 2/13

4:15 pm-10:00 pm

2 stops21h 45m

Porto

Fri 2/19

5:00 am-7:37 pm

2 stops22h 37m

$807

San FranciscoPorto

SFO San Francisco - OPO Porto

SFOOPO

San Francisco

Sun 9/20

7:35 pm-7:55 am

1 stop28h 20m

Porto

Tue 10/6

12:15 pm-4:15 pm

1 stop36h 00m

$824

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?

Prices are currently low for flights on this route.

Typical prices usually range from $905 to $1,296.
The lowest price recently found on this route was $711.

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 $675.

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 $932 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 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
2,370 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,951 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,194 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
2,034 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,472 reviews
Search Turkish Airlines flights
DeltaPriceFrom $661Free CancellationRating
7.8
8,503 reviews
Search Delta flights
United AirlinesPriceFrom $664Free CancellationRating
7.4
10,107 reviews
Search United Airlines flights
KLMPriceFrom $683Free CancellationRating
7.8
1,560 reviews
Search KLM flights
Air FrancePriceFrom $855Free CancellationRating
7.5
1,646 reviews
Search Air France flights
Air CanadaPriceFrom $860Free CancellationRating
7.1
11,483 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
Pinhao
Matosinhos
Esposende
Chaves
Arcos de Valdevez
Viseu
Espinho
Guimarães
Lamego
Ponte de Lima
Mesao Frio
Penafiel
Caminha
Baiao
Mira

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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