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Cheap flights from San Francisco to Porto from $256

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 4/26. 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
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
5:40 pm - 4:45 pm
SFO
-
OPO
16h 05m
1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pm
OPO
-
SFO
29h 00m
1 stop
$494Scandinavian Airlines
Sun, Mar 8 - Mon, Mar 16
Scandinavian Airlines Logo
5:40 pm - 4:45 pm
SFO
-
OPO
16h 05m
1 stop
Scandinavian Airlines Logo
5:35 pm - 3:35 pm
OPO
-
SFO
29h 00m
1 stop
$507Scandinavian Airlines
Sun, Mar 8 - Mon, Mar 23
Multiple Airlines Logo
8:10 am - 5:50 pm
SFO
-
OPO
25h 40m
2 stops
Multiple Airlines Logo
7:10 am - 9:21 pm
OPO
-
SFO
22h 11m
2 stops
$538Multiple Airlines
Tue, Apr 14 - Wed, Apr 29
Scandinavian Airlines Logo
4:45 pm - 11:00 am
SFO
-
OPO
34h 15m
1 stop
Scandinavian Airlines Logo
11:50 am - 2:40 pm
OPO
-
SFO
34h 50m
1 stop
$545Scandinavian Airlines
Mon, Apr 27 - Wed, May 6
Scandinavian Airlines Logo
5:40 pm - 4:45 pm
SFO
-
OPO
16h 05m
1 stop
Scandinavian Airlines Logo
10:25 am - 3:35 pm
OPO
-
SFO
36h 10m
1 stop
$581Scandinavian Airlines
Sun, Mar 8 - Wed, Mar 18
Multiple Airlines Logo
8:10 am - 5:50 pm
SFO
-
OPO
25h 40m
2 stops
Multiple Airlines Logo
7:45 am - 9:21 pm
OPO
-
SFO
21h 36m
2 stops
$582Multiple Airlines
Tue, Apr 14 - Tue, Apr 28
Scandinavian Airlines Logo
5:40 pm - 9:35 am
SFO
-
OPO
32h 55m
1 stop
Scandinavian Airlines Logo
12:00 pm - 2:40 pm
OPO
-
SFO
34h 40m
1 stop
$583Scandinavian Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
7:40 pm - 11:55 pm
SFO
-
OPO
20h 15m
1 stop
Multiple Airlines Logo
7:45 am - 5:55 pm
OPO
-
SFO
18h 10m
1 stop
$593Multiple Airlines
Tue, Apr 7 - Tue, Apr 14
Multiple Airlines Logo
3:15 pm - 11:50 pm
SFO
-
OPO
24h 35m
2 stops
Multiple Airlines Logo
9:15 am - 1:15 pm
OPO
-
SFO
36h 00m
2 stops
$597Multiple Airlines
Wed, Apr 22 - Mon, Apr 27
Multiple Airlines Logo
8:10 am - 12:40 am
SFO
-
OPO
32h 30m
3 stops
Multiple Airlines Logo
7:10 am - 9:21 pm
OPO
-
SFO
22h 11m
2 stops
$600Multiple Airlines
Tue, Apr 14 - Wed, Apr 29

KLM flights from San Francisco to Porto

Our best KLM deals on San Francisco to Porto flight tickets
KLM
Mar 24
SFO2:55 pmSan Francisco
17h 30m
1 stop
OPO3:25 pmPorto
Mar 31
OPO4:20 pmPorto
27h 25m
1 stop
SFO11:45 amSan Francisco
$684
KLM
Apr 7
SFO3:05 pmSan Francisco
23h 00m
1 stop
OPO10:05 pmPorto
Apr 14
OPO5:00 amPorto
18h 59m
2 stops
SFO3:59 pmSan Francisco
$687
KLM
Apr 22
SFO5:00 pmSan Francisco
17h 20m
2 stops
OPO6:20 pmPorto
May 4
OPO4:20 pmPorto
27h 25m
1 stop
SFO11:45 amSan Francisco
$688

Scandinavian Airlines flights from San Francisco to Porto

Our best Scandinavian Airlines deals on San Francisco to Porto flight tickets
Scandinavian Airlines
Mar 8
SFO5:40 pmSan Francisco
16h 05m
1 stop
OPO4:45 pmPorto
Mar 16
OPO5:35 pmPorto
29h 00m
1 stop
SFO3:35 pmSan Francisco
$494
Scandinavian Airlines
Mar 8
SFO5:40 pmSan Francisco
16h 05m
1 stop
OPO4:45 pmPorto
Mar 23
OPO5:35 pmPorto
29h 00m
1 stop
SFO3:35 pmSan Francisco
$507
Scandinavian Airlines
Apr 27
SFO4:45 pmSan Francisco
34h 15m
1 stop
OPO11:00 amPorto
May 6
OPO11:50 amPorto
34h 50m
1 stop
SFO2:40 pmSan Francisco
$545

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 February 22, 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

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 3/8

5:40 pm-4:45 pm

1 stop16h 05m

Porto

Mon 3/16

5:35 pm-3:35 pm

1 stop29h 00m

$494

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 3/8

5:40 pm-4:45 pm

1 stop16h 05m

Porto

Mon 3/23

5:35 pm-3:35 pm

1 stop29h 00m

$507

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/14

8:10 am-5:50 pm

2 stops25h 40m

Porto

Wed 4/29

7:10 am-9:21 pm

2 stops22h 11m

$538

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 4/27

4:45 pm-11:00 am

1 stop34h 15m

Porto

Wed 5/6

11:50 am-2:40 pm

1 stop34h 50m

$545

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 3/8

5:40 pm-4:45 pm

1 stop16h 05m

Porto

Wed 3/18

10:25 am-3:35 pm

1 stop36h 10m

$581

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/14

8:10 am-5:50 pm

2 stops25h 40m

Porto

Tue 4/28

7:45 am-9:21 pm

2 stops21h 36m

$582

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 3/23

5:40 pm-9:35 am

1 stop32h 55m

Porto

Mon 3/30

12:00 pm-2:40 pm

1 stop34h 40m

$583

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/7

7:40 pm-11:55 pm

1 stop20h 15m

Porto

Tue 4/14

7:45 am-5:55 pm

1 stop18h 10m

$593

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 4/22

3:15 pm-11:50 pm

2 stops24h 35m

Porto

Mon 4/27

9:15 am-1:15 pm

2 stops36h 00m

$597

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/14

8:10 am-12:40 am

3 stops32h 30m

Porto

Wed 4/29

7:10 am-9:21 pm

2 stops22h 11m

$600

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 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 $676. If you aren’t able to travel during the month of February, then book flights to Porto from San Francisco during November instead. Flights to Porto in November, while not as cheap as those in February, still average around $731.

How far in advance should I book a flight 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 $900 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 $756 on momondo.

How have San Francisco to Porto flight prices changed over time?

As of February 2026, prices for San Francisco to Porto flights are approximately 12% 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 25m

Direct flights

None
The fastest flight from San Francisco to Porto takes 14h 25m
There are no direct flights from San Francisco to Porto. There are no popular flight routes from San Francisco to Porto.
Search flight deals

  • How far is San Francisco to Porto by plane?

    Porto is 5565.0 mi away from San Francisco. Typically, this will take 14h 25m 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
7.1
2,146 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $480Free CancellationRating
7.3
1,693 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom $625Free CancellationRating
6.8
7,802 reviews
Search Lufthansa flights
SWISSPriceFrom $626Free CancellationRating
7.5
1,878 reviews
Search SWISS flights
IberiaPriceFrom $660Free CancellationRating
7.0
3,118 reviews
Search Iberia flights
DeltaPriceFrom $661Free CancellationRating
7.9
8,241 reviews
Search Delta flights
KLMPriceFrom $673Free CancellationRating
7.7
1,457 reviews
Search KLM flights
United AirlinesPriceFrom $675Free CancellationRating
7.4
9,341 reviews
Search United Airlines flights
Air CanadaPriceFrom $776Free CancellationRating
7.1
10,738 reviews
Search Air Canada flights
American AirlinesPriceFrom $1,000Free CancellationRating
7.2
11,338 reviews
Search American Airlines 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
Matosinhos
Braga
Aveiro
Esposende
Lamego
Guimarães
Pinhao
Chaves
Espinho
Arcos de Valdevez
Viseu
Ponte de Lima
Curia
Penafiel
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.

An easier way to manage your Porto trip

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