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Cheap flights from Porto to San Francisco from $379

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 2/4. 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 Porto to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
6:00 pm - 4:05 pm
OPO
-
SFO
30h 05m1 stop
TAP AIR PORTUGAL Logo
4:35 pm - 3:05 pm
SFO
-
OPO
14h 30m1 stop
$623TAP AIR PORTUGAL
jue., ene. 15 - mié., ene. 28
TAP AIR PORTUGAL Logo
6:00 pm - 4:05 pm
OPO
-
SFO
30h 05m1 stop
TAP AIR PORTUGAL Logo
4:35 pm - 5:00 pm
SFO
-
OPO
16h 25m1 stop
$625TAP AIR PORTUGAL
jue., ene. 15 - mié., ene. 28
TAP AIR PORTUGAL Logo
6:55 am - 3:35 pm
OPO
-
SFO
15h 40m1 stop
TAP AIR PORTUGAL Logo
8:10 pm - 6:30 am
SFO
-
OPO
27h 20m1 stop
$628TAP AIR PORTUGAL
lun., mar. 9 - vie., mar. 27
Multiple Airlines Logo
9:55 pm - 4:05 pm
OPO
-
SFO
26h 10m2 stops
Multiple Airlines Logo
4:35 pm - 10:30 pm
SFO
-
OPO
21h 55m2 stops
$681Multiple Airlines
jue., ene. 15 - mié., ene. 28
Multiple Airlines Logo
9:55 pm - 4:05 pm
OPO
-
SFO
26h 10m2 stops
Multiple Airlines Logo
4:35 pm - 10:30 pm
SFO
-
OPO
21h 55m2 stops
$682Multiple Airlines
jue., ene. 15 - mié., ene. 28
TAP AIR PORTUGAL Logo
6:55 am - 2:45 pm
OPO
-
SFO
15h 50m1 stop
TAP AIR PORTUGAL Logo
4:35 pm - 3:00 pm
SFO
-
OPO
14h 25m1 stop
$683TAP AIR PORTUGAL
sáb., ene. 31 - sáb., feb. 7
TAP AIR PORTUGAL Logo
6:55 am - 2:45 pm
OPO
-
SFO
15h 50m1 stop
TAP AIR PORTUGAL Logo
4:35 pm - 3:00 pm
SFO
-
OPO
14h 25m1 stop
$684TAP AIR PORTUGAL
sáb., ene. 31 - sáb., feb. 7
TAP AIR PORTUGAL Logo
6:00 pm - 2:45 pm
OPO
-
SFO
28h 45m1 stop
TAP AIR PORTUGAL Logo
7:10 pm - 12:30 am
SFO
-
OPO
21h 20m1 stop
$688TAP AIR PORTUGAL
vie., ene. 30 - vie., feb. 6
Multiple Airlines Logo
8:10 pm - 4:05 pm
OPO
-
SFO
27h 55m2 stops
Multiple Airlines Logo
4:35 pm - 10:30 pm
SFO
-
OPO
21h 55m2 stops
$705Multiple Airlines
jue., ene. 15 - mié., ene. 28
Multiple Airlines Logo
6:10 pm - 11:50 am
OPO
-
SFO
25h 40m2 stops
Multiple Airlines Logo
1:55 pm - 10:55 pm
SFO
-
OPO
25h 00m2 stops
$706Multiple Airlines
sáb., ene. 31 - sáb., feb. 7

TAP AIR PORTUGAL flights from Porto to San Francisco

Our best TAP AIR PORTUGAL deals on Porto to San Francisco flight tickets
TAP AIR PORTUGAL
Jan 15
OPO6:00 pmPorto
30h 05m
1 stop
SFO4:05 pmSan Francisco
Jan 28
SFO4:35 pmSan Francisco
14h 30m
1 stop
OPO3:05 pmPorto
$623
Find similar
TAP AIR PORTUGAL
Jan 15
OPO6:00 pmPorto
30h 05m
1 stop
SFO4:05 pmSan Francisco
Jan 28
SFO4:35 pmSan Francisco
16h 25m
1 stop
OPO5:00 pmPorto
$625
Find similar
TAP AIR PORTUGAL
Mar 9
OPO6:55 amPorto
15h 40m
1 stop
SFO3:35 pmSan Francisco
Mar 27
SFO8:10 pmSan Francisco
27h 20m
1 stop
OPO6:30 amPorto
$628
Find similar

Lufthansa flights from Porto to San Francisco

Our best Lufthansa deals on Porto to San Francisco flight tickets
Lufthansa
Jan 15
OPO6:00 amPorto
17h 55m
1 stop
SFO3:55 pmSan Francisco
Jan 28
SFO1:30 pmSan Francisco
15h 45m
1 stop
OPO1:15 pmPorto
$732
Find similar
Lufthansa
Jan 15
OPO6:00 amPorto
17h 55m
1 stop
SFO3:55 pmSan Francisco
Jan 28
SFO1:30 pmSan Francisco
15h 45m
1 stop
OPO1:15 pmPorto
$733
Find similar
Lufthansa
Jan 15
OPO6:00 amPorto
17h 55m
1 stop
SFO3:55 pmSan Francisco
Jan 28
SFO8:25 amSan Francisco
20h 50m
2 stops
OPO1:15 pmPorto
$754
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 diciembre 17, 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

jue. 1/15

6:00 pm-4:05 pm

1 stop30h 05m

San Francisco

mié. 1/28

4:35 pm-3:05 pm

1 stop14h 30m

$623

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

jue. 1/15

6:00 pm-4:05 pm

1 stop30h 05m

San Francisco

mié. 1/28

4:35 pm-5:00 pm

1 stop16h 25m

$625

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

lun. 3/9

6:55 am-3:35 pm

1 stop15h 40m

San Francisco

vie. 3/27

8:10 pm-6:30 am

1 stop27h 20m

$628

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

jue. 1/15

9:55 pm-4:05 pm

2 stops26h 10m

San Francisco

mié. 1/28

4:35 pm-10:30 pm

2 stops21h 55m

$681

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

jue. 1/15

9:55 pm-4:05 pm

2 stops26h 10m

San Francisco

mié. 1/28

4:35 pm-10:30 pm

2 stops21h 55m

$682

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

sáb. 1/31

6:55 am-2:45 pm

1 stop15h 50m

San Francisco

sáb. 2/7

4:35 pm-3:00 pm

1 stop14h 25m

$683

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

sáb. 1/31

6:55 am-2:45 pm

1 stop15h 50m

San Francisco

sáb. 2/7

4:35 pm-3:00 pm

1 stop14h 25m

$684

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

vie. 1/30

6:00 pm-2:45 pm

1 stop28h 45m

San Francisco

vie. 2/6

7:10 pm-12:30 am

1 stop21h 20m

$688

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

jue. 1/15

8:10 pm-4:05 pm

2 stops27h 55m

San Francisco

mié. 1/28

4:35 pm-10:30 pm

2 stops21h 55m

$705

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

sáb. 1/31

6:10 pm-11:50 am

2 stops25h 40m

San Francisco

sáb. 2/7

1:55 pm-10:55 pm

2 stops25h 00m

$706

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 September, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $665.

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 30% 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 December 2025, prices for Porto to San Francisco flights are approximately 2% cheaper 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

Fastest flight time

15h 40m

Direct flights

None
The fastest flight from Porto to San Francisco takes 15h 40m
There are no direct flights from Porto to San Francisco. There are no popular flight routes from Porto to San Francisco.
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 40m 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 $665Free CancellationRating
6.8
7,632 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
Bodega Bay
Roseville
Hayward
Calistoga
Big Sur
Berkeley
Santa Clara
Walnut Creek
Fremont
Daly City
Half Moon Bay
Vallejo
Salinas
Livermore
Sunnyvale
Turlock

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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