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Cheap flights from Porto to San Francisco from $416

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 9/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Porto to San Francisco

Cheap round-trip flights

TAP AIR PORTUGAL Logo
10:35 pm - 4:45 pmOPO-SFO
26h 10m2 stops
TAP AIR PORTUGAL Logo
4:20 pm - 7:00 pmSFO-OPO
18h 40m1 stop
$595TAP AIR PORTUGAL
Find Deal
Mon, Sep 8 - Mon, Sep 22
TAP AIR PORTUGAL Logo
9:15 pm - 1:35 pmOPO-SFO
24h 20m1 stop
TAP AIR PORTUGAL Logo
4:20 pm - 7:00 pmSFO-OPO
18h 40m1 stop
$610TAP AIR PORTUGAL
Find Deal
Mon, Sep 22 - Mon, Sep 29
TAP AIR PORTUGAL Logo
7:00 am - 2:30 pmOPO-SFO
15h 30m1 stop
TAP AIR PORTUGAL Logo
4:20 pm - 5:00 pmSFO-OPO
16h 40m1 stop
$611TAP AIR PORTUGAL
Find Deal
Mon, Sep 8 - Mon, Sep 22
Scandinavian Airlines Logo
5:55 pm - 4:30 pmOPO-SFO
30h 35m1 stop
Scandinavian Airlines Logo
8:50 pm - 4:45 pmSFO-OPO
36h 55m1 stop
$646Scandinavian Airlines
Find Deal
Fri, Oct 17 - Sat, Oct 25
Logo
4:45 pm - 1:35 pmOPO-SFO
28h 50m2 stops
Logo
4:20 pm - 10:55 pmSFO-OPO
22h 35m2 stops
$647
Find Deal
Mon, Sep 22 - Mon, Sep 29
Scandinavian Airlines Logo
5:55 pm - 8:15 pmOPO-SFO
34h 20m2 stops
Scandinavian Airlines Logo
8:50 pm - 4:45 pmSFO-OPO
36h 55m1 stop
$668Scandinavian Airlines
Find Deal
Fri, Oct 17 - Sat, Oct 25
Logo
7:20 pm - 4:10 pmOPO-SFO
28h 50m1 stop
Logo
11:40 am - 9:20 amSFO-OPO
13h 40m1 stop
$677
Find Deal
Thu, Aug 28 - Wed, Sep 10
Lufthansa Logo
6:15 am - 7:35 pmOPO-SFO
21h 20m1 stop
Lufthansa Logo
7:00 am - 9:30 amSFO-OPO
18h 30m1 stop
$730Lufthansa
Find Deal
Sat, Nov 22 - Fri, Nov 28
United Airlines Logo
12:35 pm - 12:59 amOPO-SFO
20h 24m2 stops
United Airlines Logo
7:00 am - 6:55 amSFO-OPO
15h 55m1 stop
$736United Airlines
Find Deal
Mon, Sep 8 - Mon, Sep 22
United Airlines Logo
9:35 am - 6:59 pmOPO-SFO
17h 24m1 stop
United Airlines Logo
12:43 am - 6:55 amSFO-OPO
22h 12m2 stops
$739United Airlines
Find Deal
Wed, Sep 10 - Sat, Sep 20

British Airways flights from Porto to San Francisco

Our best British Airways deals on Porto to San Francisco flight tickets
British Airways
Aug 26
OPO8:40 pmPorto
29h 30m
2 stops
SFO6:10 pmSan Francisco
Sep 22
SFO3:59 pmSan Francisco
19h 51m
2 stops
OPO7:50 pmPorto
$728
Find similar
British Airways
Aug 14
OPO9:55 amPorto
35h 55m
1 stop
SFO1:50 pmSan Francisco
Aug 28
SFO3:21 pmSan Francisco
20h 59m
2 stops
OPO8:20 pmPorto
$1,075
Find similar

Lufthansa flights from Porto to San Francisco

Our best Lufthansa deals on Porto to San Francisco flight tickets
Lufthansa
Nov 22
OPO6:15 amPorto
21h 20m
1 stop
SFO7:35 pmSan Francisco
Nov 28
SFO7:00 amSan Francisco
18h 30m
1 stop
OPO9:30 amPorto
$730
Find similar
Lufthansa
Aug 14
OPO11:05 amPorto
15h 55m
1 stop
SFO7:00 pmSan Francisco
Aug 26
SFO7:00 amSan Francisco
16h 45m
1 stop
OPO7:45 amPorto
$932
Find similar
Lufthansa
Aug 14
OPO6:15 amPorto
20h 45m
1 stop
SFO7:00 pmSan Francisco
Aug 25
SFO7:00 amSan Francisco
18h 45m
1 stop
OPO9:45 amPorto
$955
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 July 31, 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

Mon 9/8

10:35 pm-4:45 pm

2 stops26h 10m

San Francisco

Mon 9/22

4:20 pm-7:00 pm

1 stop18h 40m

$595

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 9/22

9:15 pm-1:35 pm

1 stop24h 20m

San Francisco

Mon 9/29

4:20 pm-7:00 pm

1 stop18h 40m

$610

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 9/8

7:00 am-2:30 pm

1 stop15h 30m

San Francisco

Mon 9/22

4:20 pm-5:00 pm

1 stop16h 40m

$611

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 10/17

5:55 pm-4:30 pm

1 stop30h 35m

San Francisco

Sat 10/25

8:50 pm-4:45 pm

1 stop36h 55m

$646

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 9/22

4:45 pm-1:35 pm

2 stops28h 50m

San Francisco

Mon 9/29

4:20 pm-10:55 pm

2 stops22h 35m

$647

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 10/17

5:55 pm-8:15 pm

2 stops34h 20m

San Francisco

Sat 10/25

8:50 pm-4:45 pm

1 stop36h 55m

$668

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 8/28

7:20 pm-4:10 pm

1 stop28h 50m

San Francisco

Wed 9/10

11:40 am-9:20 am

1 stop13h 40m

$677

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 11/22

6:15 am-7:35 pm

1 stop21h 20m

San Francisco

Fri 11/28

7:00 am-9:30 am

1 stop18h 30m

$730

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 9/8

12:35 pm-12:59 am

2 stops20h 24m

San Francisco

Mon 9/22

7:00 am-6:55 am

1 stop15h 55m

$736

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 9/10

9:35 am-6:59 pm

1 stop17h 24m

San Francisco

Sat 9/20

12:43 am-6:55 am

2 stops22h 12m

$739

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 February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $683.

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 21% 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 July 2025, prices for Porto to San Francisco flights are approximately 7% 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

Best Price Found

$416

Fastest flight time

15h 05m

Direct flights

None

Airports in San Francisco

1 airport
The best one-way flight to San Francisco from Porto in the past 72 hours is $416. The best round-trip flight deal from Porto to San Francisco found on momondo in the last 72 hours is $595.
The fastest flight from Porto to San Francisco takes 15h 05m
There are no direct flights from Porto to San Francisco. Popular non-direct route for this connection is Porto Airport - San Francisco Airport.
There is 1 airport near San Francisco: San Francisco (SFO)
Search flight deals

  • How far is Porto to San Francisco by plane?

    There are 5565.0 mi between Porto and San Francisco. Typically, this will take 15h 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
United AirlinesPriceFrom $657Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
LufthansaPriceFrom $665Free CancellationRating
6.8
7,275 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
Calistoga
Hayward
Bodega Bay
Sonoma
Roseville
Santa Clara
Big Sur
Daly City
Berkeley
Walnut Creek
Fremont
Half Moon Bay
South San Francisco
Redwood City
Vallejo
Sunnyvale
Pacific Grove

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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