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Cheap flights from San Francisco to Porto from $341

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 8/29. 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.
Scandinavian Airlines Logo
4:45 pm - 11:00 am
SFO
-
OPO
34h 15m
1 stop
Scandinavian Airlines Logo
5:35 pm - 2:50 pm
OPO
-
SFO
29h 15m
1 stop
$733Scandinavian Airlines
Mon, Oct 19 - Sun, Nov 1
Multiple Airlines Logo
4:45 pm - 8:00 am
SFO
-
OPO
31h 15m
3 stops
Multiple Airlines Logo
10:55 am - 2:40 pm
OPO
-
SFO
35h 45m
2 stops
$738Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
4:45 pm - 11:55 pm
SFO
-
OPO
23h 10m
2 stops
Multiple Airlines Logo
10:55 am - 2:40 pm
OPO
-
SFO
35h 45m
2 stops
$746Multiple Airlines
Mon, Sep 21 - Mon, Sep 28
Multiple Airlines Logo
4:30 pm - 9:20 pm
SFO
-
OPO
20h 50m
2 stops
Multiple Airlines Logo
2:15 pm - 2:30 pm
OPO
-
SFO
32h 15m
2 stops
$753Multiple Airlines
Mon, Aug 10 - Wed, Aug 26
Multiple Airlines Logo
4:30 pm - 9:20 pm
SFO
-
OPO
20h 50m
2 stops
Multiple Airlines Logo
11:00 am - 2:30 pm
OPO
-
SFO
35h 30m
3 stops
$760Multiple Airlines
Mon, Aug 10 - Wed, Aug 26
Multiple Airlines Logo
4:30 pm - 10:55 am
SFO
-
OPO
34h 25m
3 stops
Multiple Airlines Logo
10:00 pm - 2:30 pm
OPO
-
SFO
24h 30m
2 stops
$765Multiple Airlines
Wed, Aug 19 - Wed, Aug 26
Lufthansa Logo
9:05 pm - 11:25 pm
SFO
-
OPO
18h 20m
1 stop
Lufthansa Logo
6:20 am - 7:00 pm
OPO
-
SFO
20h 40m
1 stop
$767Lufthansa
Wed, Sep 23 - Wed, Oct 7
Multiple Airlines Logo
12:15 pm - 7:00 am
SFO
-
OPO
34h 45m
2 stops
Multiple Airlines Logo
6:00 am - 12:11 pm
OPO
-
SFO
38h 11m
2 stops
$774Multiple Airlines
Tue, Sep 22 - Tue, Sep 29
KLM Logo
3:05 pm - 10:00 pm
SFO
-
OPO
22h 55m
1 stop
KLM Logo
7:55 pm - 11:45 am
OPO
-
SFO
23h 50m
1 stop
$776KLM
Mon, Oct 5 - Mon, Oct 19
Multiple Airlines Logo
5:00 am - 7:00 am
SFO
-
OPO
18h 00m
2 stops
Multiple Airlines Logo
8:40 am - 6:31 pm
OPO
-
SFO
17h 51m
2 stops
$780Multiple Airlines
Tue, Sep 22 - Tue, Sep 29

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Lufthansa flights from San Francisco to Porto

Our best Lufthansa deals on San Francisco to Porto flight tickets
Lufthansa
Sep 23
SFO9:05 pmSan Francisco
18h 20m
1 stop
OPO11:25 pmPorto
Oct 7
OPO6:20 amPorto
20h 40m
1 stop
SFO7:00 pmSan Francisco
$767
Lufthansa
Dec 11
SFO9:40 pmSan Francisco
18h 15m
1 stop
OPO11:55 pmPorto
Dec 18
OPO6:15 amPorto
21h 20m
1 stop
SFO7:35 pmSan Francisco
$778
Lufthansa
Sep 21
SFO9:05 pmSan Francisco
18h 20m
1 stop
OPO11:25 pmPorto
Oct 8
OPO6:20 amPorto
20h 40m
1 stop
SFO7:00 pmSan Francisco
$820

Delta flights from San Francisco to Porto

Our best Delta deals on San Francisco to Porto flight tickets
Delta
Oct 15
SFO11:05 amSan Francisco
20h 20m
2 stops
OPO3:25 pmPorto
Oct 30
OPO5:00 amPorto
19h 18m
2 stops
SFO5:18 pmSan Francisco
$823
Delta
Aug 10
SFO7:00 amSan Francisco
19h 30m
1 stop
OPO10:30 amPorto
Aug 24
OPO11:25 amPorto
32h 20m
1 stop
SFO11:45 amSan Francisco
$829
Delta
Sep 21
SFO8:10 pmSan Francisco
35h 15m
1 stop
OPO3:25 pmPorto
Sep 28
OPO11:25 amPorto
32h 20m
1 stop
SFO11:45 amSan Francisco
$837

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 29, 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 10/19

4:45 pm-11:00 am

1 stop34h 15m

Porto

Sun 11/1

5:35 pm-2:50 pm

1 stop29h 15m

$733

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 9/21

4:45 pm-8:00 am

3 stops31h 15m

Porto

Mon 9/28

10:55 am-2:40 pm

2 stops35h 45m

$738

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 9/21

4:45 pm-11:55 pm

2 stops23h 10m

Porto

Mon 9/28

10:55 am-2:40 pm

2 stops35h 45m

$746

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/10

4:30 pm-9:20 pm

2 stops20h 50m

Porto

Wed 8/26

2:15 pm-2:30 pm

2 stops32h 15m

$753

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 8/10

4:30 pm-9:20 pm

2 stops20h 50m

Porto

Wed 8/26

11:00 am-2:30 pm

3 stops35h 30m

$760

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 8/19

4:30 pm-10:55 am

3 stops34h 25m

Porto

Wed 8/26

10:00 pm-2:30 pm

2 stops24h 30m

$765

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 9/23

9:05 pm-11:25 pm

1 stop18h 20m

Porto

Wed 10/7

6:20 am-7:00 pm

1 stop20h 40m

$767

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/22

12:15 pm-7:00 am

2 stops34h 45m

Porto

Tue 9/29

6:00 am-12:11 pm

2 stops38h 11m

$774

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 10/5

3:05 pm-10:00 pm

1 stop22h 55m

Porto

Mon 10/19

7:55 pm-11:45 am

1 stop23h 50m

$776
Quickest round-trip

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 9/22

5:00 am-7:00 am

2 stops18h 00m

Porto

Tue 9/29

8:40 am-6:31 pm

2 stops17h 51m

$780

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 $588. 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 $894 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 $747 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 22% 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 40m

Direct flights

None
The fastest flight from San Francisco to Porto takes 14h 40m
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 40m 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
2,307 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.4
1,859 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
8,108 reviews
Search Lufthansa flights
SWISSPriceFrom $643Free CancellationRating
7.5
1,979 reviews
Search SWISS flights
Turkish AirlinesPriceFrom $654Free CancellationRating
7.4
4,427 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
9,895 reviews
Search United Airlines flights
IberiaPriceFrom $676Free CancellationRating
7.0
3,250 reviews
Search Iberia flights
KLMPriceFrom $683Free CancellationRating
7.8
1,531 reviews
Search KLM flights
DeltaPriceFrom $778Free CancellationRating
7.8
8,453 reviews
Search Delta flights
Air CanadaPriceFrom $787Free CancellationRating
7.1
11,269 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
Esposende
Chaves
Pinhao
Guimarães
Arcos de Valdevez
Espinho
Ponte de Lima
Viseu
Curia
Mesao Frio
Penafiel
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.

An easier way to manage your Porto trip

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