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Cheap flights from Porto to San Francisco from $414

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 1/17. 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

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
10:35 pm - 2:35 pmOPO-SFO
24h 00m1 stop
TAP AIR PORTUGAL Logo
4:35 pm - 12:40 amSFO-OPO
24h 05m1 stop
$596TAP AIR PORTUGAL
Find Deal
lun., avr. 20 - mar., mai 5
TAP AIR PORTUGAL Logo
9:00 am - 4:05 pmOPO-SFO
15h 05m1 stop
TAP AIR PORTUGAL Logo
7:10 pm - 5:00 pmSFO-OPO
13h 50m1 stop
$610TAP AIR PORTUGAL
Find Deal
ven., nov. 14 - ven., nov. 28
Multiple Airlines Logo
4:50 pm - 6:00 pmOPO-SFO
33h 10m1 stop
Multiple Airlines Logo
7:45 pm - 8:00 amSFO-OPO
28h 15m1 stop
$701Multiple Airlines
Find Deal
sam., avr. 25 - dim., mai 10
Multiple Airlines Logo
6:30 am - 11:50 amOPO-SFO
37h 20m1 stop
Multiple Airlines Logo
8:00 am - 10:30 amSFO-OPO
18h 30m2 stops
$721Multiple Airlines
Find Deal
ven., janv. 23 - ven., janv. 30
Delta Logo
6:30 am - 1:12 amOPO-SFO
26h 42m2 stops
Delta Logo
5:45 am - 10:30 amSFO-OPO
20h 45m2 stops
$727Delta
Find Deal
ven., nov. 14 - ven., nov. 28
KLM Logo
6:00 am - 11:09 pmOPO-SFO
25h 09m2 stops
KLM Logo
10:30 am - 1:20 pmSFO-OPO
18h 50m2 stops
$732KLM
Find Deal
mer., nov. 12 - jeu., déc. 4
KLM Logo
6:00 am - 11:09 pmOPO-SFO
25h 09m2 stops
KLM Logo
1:55 pm - 3:25 pmSFO-OPO
17h 30m1 stop
$733KLM
Find Deal
mer., nov. 12 - mer., déc. 3
Delta Logo
11:20 am - 11:13 pmOPO-SFO
19h 53m2 stops
Delta Logo
7:00 am - 10:25 amSFO-OPO
19h 25m2 stops
$735Delta
Find Deal
ven., déc. 5 - jeu., déc. 11
Lufthansa Logo
6:00 am - 8:00 pmOPO-SFO
22h 00m1 stop
Lufthansa Logo
1:45 pm - 11:25 pmSFO-OPO
25h 40m1 stop
$743Lufthansa
Find Deal
mer., avr. 1 - dim., avr. 5
Lufthansa Logo
6:00 am - 4:05 pmOPO-SFO
18h 05m1 stop
Lufthansa Logo
9:05 pm - 11:20 pmSFO-OPO
18h 15m1 stop
$746Lufthansa
Find Deal
mer., avr. 1 - dim., avr. 5

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
Apr 20
OPO10:35 pmPorto
24h 00m
1 stop
SFO2:35 pmSan Francisco
May 5
SFO4:35 pmSan Francisco
24h 05m
1 stop
OPO12:40 amPorto
$596
Find similar
TAP AIR PORTUGAL
Nov 14
OPO9:00 amPorto
15h 05m
1 stop
SFO4:05 pmSan Francisco
Nov 28
SFO7:10 pmSan Francisco
13h 50m
1 stop
OPO5:00 pmPorto
$610
Find similar
TAP AIR PORTUGAL
Nov 14
OPO12:00 pmPorto
34h 45m
1 stop
SFO2:45 pmSan Francisco
Nov 28
SFO7:10 pmSan Francisco
14h 50m
1 stop
OPO6:00 pmPorto
$654
Find similar

Delta flights from Porto to San Francisco

Our best Delta deals on Porto to San Francisco flight tickets
Delta
Nov 14
OPO6:30 amPorto
26h 42m
2 stops
SFO1:12 amSan Francisco
Nov 28
SFO5:45 amSan Francisco
20h 45m
2 stops
OPO10:30 amPorto
$727
Find similar
Delta
Dec 5
OPO11:20 amPorto
19h 53m
2 stops
SFO11:13 pmSan Francisco
Dec 11
SFO7:00 amSan Francisco
19h 25m
2 stops
OPO10:25 amPorto
$735
Find similar
Delta
Nov 11
OPO11:15 amPorto
32h 35m
1 stop
SFO11:50 amSan Francisco
Dec 4
SFO7:00 amSan Francisco
19h 25m
2 stops
OPO10:25 amPorto
$744
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 octobre 30, 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

lun. 4/20

10:35 pm-2:35 pm

1 stop24h 00m

San Francisco

mar. 5/5

4:35 pm-12:40 am

1 stop24h 05m

$596

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

ven. 11/14

9:00 am-4:05 pm

1 stop15h 05m

San Francisco

ven. 11/28

7:10 pm-5:00 pm

1 stop13h 50m

$610

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

sam. 4/25

4:50 pm-6:00 pm

1 stop33h 10m

San Francisco

dim. 5/10

7:45 pm-8:00 am

1 stop28h 15m

$701

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

ven. 1/23

6:30 am-11:50 am

1 stop37h 20m

San Francisco

ven. 1/30

8:00 am-10:30 am

2 stops18h 30m

$721

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

ven. 11/14

6:30 am-1:12 am

2 stops26h 42m

San Francisco

ven. 11/28

5:45 am-10:30 am

2 stops20h 45m

$727

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

mer. 11/12

6:00 am-11:09 pm

2 stops25h 09m

San Francisco

jeu. 12/4

10:30 am-1:20 pm

2 stops18h 50m

$732

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

mer. 11/12

6:00 am-11:09 pm

2 stops25h 09m

San Francisco

mer. 12/3

1:55 pm-3:25 pm

1 stop17h 30m

$733

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

ven. 12/5

11:20 am-11:13 pm

2 stops19h 53m

San Francisco

jeu. 12/11

7:00 am-10:25 am

2 stops19h 25m

$735

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

mer. 4/1

6:00 am-8:00 pm

1 stop22h 00m

San Francisco

dim. 4/5

1:45 pm-11:25 pm

1 stop25h 40m

$743

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

mer. 4/1

6:00 am-4:05 pm

1 stop18h 05m

San Francisco

dim. 4/5

9:05 pm-11:20 pm

1 stop18h 15m

$746

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 $674.

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 5% 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 October 2025, prices for Porto to San Francisco flights are approximately 28% 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

Direct flights

None
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 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
7,541 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
Calistoga
Hayward
Big Sur
Santa Clara
Daly City
Fremont
Berkeley
Vallejo
Walnut Creek
Half Moon Bay
Salinas
Turlock
Livermore
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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