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Cheap flights from Porto to San Francisco from $376

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Porto to San Francisco departing on 10/13. 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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Cheap round-trip flights

Scandinavian Airlines Logo
5:35 pm - 2:35 pmOPO-SFO
29h 00m1 stop
Scandinavian Airlines Logo
4:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
$563Scandinavian Airlines
Find Deal
Fri, Dec 5 - Thu, Dec 11
Scandinavian Airlines Logo
5:35 pm - 2:35 pmOPO-SFO
29h 00m1 stop
Scandinavian Airlines Logo
4:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
$564Scandinavian Airlines
Find Deal
Fri, Dec 5 - Thu, Dec 11
Scandinavian Airlines Logo
5:35 pm - 2:35 pmOPO-SFO
29h 00m1 stop
Scandinavian Airlines Logo
7:05 am - 4:55 pmSFO-OPO
25h 50m2 stops
$621Scandinavian Airlines
Find Deal
Fri, Dec 5 - Thu, Dec 11
Scandinavian Airlines Logo
5:35 pm - 2:35 pmOPO-SFO
29h 00m1 stop
Scandinavian Airlines Logo
7:05 am - 4:55 pmSFO-OPO
25h 50m2 stops
$622Scandinavian Airlines
Find Deal
Fri, Dec 5 - Thu, Dec 11
Iberia Logo
8:20 am - 8:30 pmOPO-SFO
20h 10m2 stops
Iberia Logo
6:00 am - 7:40 amSFO-OPO
17h 40m2 stops
$661Iberia
Find Deal
Fri, Dec 5 - Thu, Dec 11
American Airlines Logo
8:20 am - 8:14 pmOPO-SFO
19h 54m2 stops
American Airlines Logo
5:30 pm - 8:00 pmSFO-OPO
18h 30m2 stops
$665American Airlines
Find Deal
Fri, Nov 7 - Sun, Nov 23
American Airlines Logo
8:20 am - 8:23 pmOPO-SFO
20h 03m2 stops
American Airlines Logo
6:00 am - 7:40 amSFO-OPO
17h 40m2 stops
$670American Airlines
Find Deal
Fri, Dec 5 - Thu, Dec 11
Delta Logo
6:15 am - 7:30 pmOPO-SFO
21h 15m2 stops
Delta Logo
3:05 pm - 3:30 pmSFO-OPO
16h 25m1 stop
$673Delta
Find Deal
Wed, Oct 15 - Thu, Oct 23
Delta Logo
6:30 am - 8:40 pmOPO-SFO
22h 10m2 stops
Delta Logo
7:00 am - 3:25 pmSFO-OPO
24h 25m2 stops
$679Delta
Find Deal
Fri, Nov 7 - Sun, Nov 23
Lufthansa Logo
6:15 am - 7:35 pmOPO-SFO
21h 20m1 stop
Lufthansa Logo
9:40 pm - 11:40 pmSFO-OPO
18h 00m1 stop
$3,158Lufthansa
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Fri, Nov 14 - Fri, Dec 5

Scandinavian Airlines flights from Porto to San Francisco

Our best Scandinavian Airlines deals on Porto to San Francisco flight tickets
Scandinavian Airlines
Dec 5
OPO5:35 pmPorto
29h 00m
1 stop
SFO2:35 pmSan Francisco
Dec 11
SFO4:40 pmSan Francisco
16h 15m
1 stop
OPO4:55 pmPorto
$563
Find similar
Scandinavian Airlines
Dec 5
OPO5:35 pmPorto
29h 00m
1 stop
SFO2:35 pmSan Francisco
Dec 11
SFO4:40 pmSan Francisco
16h 15m
1 stop
OPO4:55 pmPorto
$564
Find similar
Scandinavian Airlines
Dec 5
OPO5:35 pmPorto
29h 00m
1 stop
SFO2:35 pmSan Francisco
Dec 11
SFO7:05 amSan Francisco
25h 50m
2 stops
OPO4:55 pmPorto
$621
Find similar

KLM flights from Porto to San Francisco

Our best KLM deals on Porto to San Francisco flight tickets
KLM
Dec 5
OPO6:30 amPorto
19h 35m
2 stops
SFO6:05 pmSan Francisco
Dec 11
SFO1:55 pmSan Francisco
15h 25m
1 stop
OPO1:20 pmPorto
$678
Find similar
KLM
Sep 24
OPO4:20 pmPorto
33h 55m
1 stop
SFO6:15 pmSan Francisco
Oct 8
SFO3:05 pmSan Francisco
16h 25m
1 stop
OPO3:30 pmPorto
$686
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Porto to San Francisco 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 September 15, 2025.
Use the filters below to find and compare flights from Porto to San Francisco that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 12/5

5:35 pm-2:35 pm

1 stop29h 00m

San Francisco

Thu 12/11

4:40 pm-4:55 pm

1 stop16h 15m

$563

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 12/5

5:35 pm-2:35 pm

1 stop29h 00m

San Francisco

Thu 12/11

4:40 pm-4:55 pm

1 stop16h 15m

$564

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 12/5

5:35 pm-2:35 pm

1 stop29h 00m

San Francisco

Thu 12/11

7:05 am-4:55 pm

2 stops25h 50m

$621

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 12/5

5:35 pm-2:35 pm

1 stop29h 00m

San Francisco

Thu 12/11

7:05 am-4:55 pm

2 stops25h 50m

$622

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 12/5

8:20 am-8:30 pm

2 stops20h 10m

San Francisco

Thu 12/11

6:00 am-7:40 am

2 stops17h 40m

$661

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 11/7

8:20 am-8:14 pm

2 stops19h 54m

San Francisco

Sun 11/23

5:30 pm-8:00 pm

2 stops18h 30m

$665

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 12/5

8:20 am-8:23 pm

2 stops20h 03m

San Francisco

Thu 12/11

6:00 am-7:40 am

2 stops17h 40m

$670

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 10/15

6:15 am-7:30 pm

2 stops21h 15m

San Francisco

Thu 10/23

3:05 pm-3:30 pm

1 stop16h 25m

$673

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 11/7

6:30 am-8:40 pm

2 stops22h 10m

San Francisco

Sun 11/23

7:00 am-3:25 pm

2 stops24h 25m

$679

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 11/14

6:15 am-7:35 pm

1 stop21h 20m

San Francisco

Fri 12/5

9:40 pm-11:40 pm

1 stop18h 00m

$3,158

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 San Francisco from

How to get the cheapest flight ticket from Porto to San Francisco

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 San Francisco?

If you aren’t able to travel to San Francisco during the month of November, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $673.

What is the cheapest day to depart on your flight to San Francisco?

The cheapest day to depart from Porto to San Francisco is on a Wednesday when prices can be found for as low as $668. The most expensive day to fly to San Francisco is Saturday, with ticket prices averaging around $941.

Can stopping save me money on Porto to San Francisco flights?

You could potentially save up to 20% on your flight if you consider stops on a Porto to San Francisco flight.

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

As of September 2025, prices for Porto to San Francisco flights are approximately 0% more expensive when compared to flights at the same time last year.

When to book flights from Porto to San Francisco

Are you open to changing your travel dates? Check out the ideal times to fly from Porto to San Francisco according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Porto to San Francisco (OPO to SFO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Porto to San Francisco

Direct flights

None
There are no direct flights from Porto to San Francisco. There are no popular flight routes from Porto to San Francisco.
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  • How far is Porto to San Francisco by plane?

    There are 5565.0 mi between Porto and San Francisco. Typically, this will take 18h 05m by plane in normal conditions.

  • When did momondo last update prices for flights from Porto Airport to San Francisco Airport?

    Prices for flights from Porto Airport to San Francisco Airport refresh daily.

  • How many operators does momondo search for flights from Porto Airport to San Francisco Airport?

  • How old do you have to be to fly from Porto Airport to San Francisco 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 Porto Airport to San Francisco Airport.

  • What documentation or ID do you need to fly to San Francisco Airport?

    The necessary travel and health documents for your San Francisco 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 Porto to San Francisco?

Best airlines flying from Porto to San Francisco

Compare and see reviews for airlines that fly from Porto to San Francisco with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $670Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights

Traveling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Santa Cruz
Carmel-by-the-Sea
Modesto
Sonoma
Calistoga
Bodega Bay
Roseville
Hayward
Big Sur
Santa Clara
Daly City
Fremont
Berkeley
Half Moon Bay
Walnut Creek
Vallejo
Redwood City
Salinas
South San Francisco
Fairfield

Why use momondo?

Why should I use momondo to find a flight deal from Porto to San Francisco?

It is quick and easy to find Porto to San Francisco flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to San Francisco that suits you.

Can I find flights from Porto to San Francisco with flexible booking policies on momondo?

Yes. All flights to San Francisco from Porto on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Porto to San Francisco?

Once all potential Porto to San Francisco 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 Porto to San Francisco right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Porto to San Francisco flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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