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Cheap flights from Porto to San Francisco from $371

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 5/22. 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.
Multiple Airlines Logo
6:00 am - 3:25 pm
OPO
-
SFO
17h 25m
1 stop
Multiple Airlines Logo
6:30 am - 11:20 am
SFO
-
OPO
20h 50m
2 stops
$741Multiple Airlines
Thu, May 14 - Wed, May 27
Multiple Airlines Logo
7:15 am - 5:55 pm
OPO
-
SFO
18h 40m
1 stop
Multiple Airlines Logo
7:40 pm - 10:05 pm
SFO
-
OPO
18h 25m
1 stop
$746Multiple Airlines
Thu, Apr 16 - Thu, Apr 30
Lufthansa Logo
12:10 pm - 8:00 pm
OPO
-
SFO
15h 50m
1 stop
Lufthansa Logo
7:00 am - 9:45 am
SFO
-
OPO
18h 45m
1 stop
$750Lufthansa
Thu, Apr 2 - Wed, Apr 15
Multiple Airlines Logo
12:10 pm - 8:00 pm
OPO
-
SFO
15h 50m
1 stop
Multiple Airlines Logo
7:35 pm - 6:30 pm
SFO
-
OPO
14h 55m
1 stop
$751Multiple Airlines
Thu, Apr 30 - Thu, May 7
United Airlines Logo
6:00 am - 3:25 pm
OPO
-
SFO
17h 25m
1 stop
United Airlines Logo
7:00 am - 9:45 am
SFO
-
OPO
18h 45m
1 stop
$754United Airlines
Thu, Apr 2 - Mon, Apr 6
United Airlines Logo
6:00 am - 8:00 pm
OPO
-
SFO
22h 00m
1 stop
United Airlines Logo
11:59 pm - 6:55 am
SFO
-
OPO
22h 56m
1 stop
$756United Airlines
Thu, May 14 - Wed, May 27
Multiple Airlines Logo
6:00 am - 3:25 pm
OPO
-
SFO
17h 25m
1 stop
Multiple Airlines Logo
2:00 pm - 7:55 am
SFO
-
OPO
33h 55m
1 stop
$759Multiple Airlines
Thu, May 7 - Thu, May 14
United Airlines Logo
6:00 am - 8:00 pm
OPO
-
SFO
22h 00m
1 stop
United Airlines Logo
5:00 am - 9:45 am
SFO
-
OPO
20h 45m
2 stops
$760United Airlines
Thu, Apr 2 - Wed, Apr 15
Multiple Airlines Logo
6:20 am - 7:00 pm
OPO
-
SFO
20h 40m
1 stop
Multiple Airlines Logo
2:00 pm - 7:55 am
SFO
-
OPO
33h 55m
1 stop
$762Multiple Airlines
Fri, May 1 - Fri, May 8
United Airlines Logo
6:00 am - 8:00 pm
OPO
-
SFO
22h 00m
1 stop
United Airlines Logo
5:00 am - 9:45 am
SFO
-
OPO
20h 45m
2 stops
$778United Airlines
Thu, Apr 2 - Wed, Apr 15

Lufthansa flights from Porto to San Francisco

Our best Lufthansa deals on Porto to San Francisco flight tickets
Lufthansa
Apr 2
OPO12:10 pmPorto
15h 50m
1 stop
SFO8:00 pmSan Francisco
Apr 15
SFO7:00 amSan Francisco
18h 45m
1 stop
OPO9:45 amPorto
$750
Lufthansa
Apr 2
OPO6:00 amPorto
22h 00m
1 stop
SFO8:00 pmSan Francisco
Apr 14
SFO7:00 amSan Francisco
18h 45m
1 stop
OPO9:45 amPorto
$780
Lufthansa
May 1
OPO11:05 amPorto
15h 55m
1 stop
SFO7:00 pmSan Francisco
May 8
SFO9:05 pmSan Francisco
17h 40m
2 stops
OPO10:45 pmPorto
$799

Delta flights from Porto to San Francisco

Our best Delta deals on Porto to San Francisco flight tickets
Delta
Apr 23
OPO5:00 amPorto
14h 45m
1 stop
SFO11:45 amSan Francisco
May 2
SFO3:05 pmSan Francisco
22h 55m
1 stop
OPO10:00 pmPorto
$790
Delta
Apr 23
OPO5:00 amPorto
22h 20m
2 stops
SFO7:20 pmSan Francisco
May 2
SFO3:05 pmSan Francisco
22h 55m
1 stop
OPO10:00 pmPorto
$795
Delta
Apr 2
OPO5:00 amPorto
14h 45m
1 stop
SFO11:45 amSan Francisco
Apr 15
SFO2:57 pmSan Francisco
23h 03m
2 stops
OPO10:00 pmPorto
$796

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 March 21, 2026.
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

Cheapest round-trip

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/14

6:00 am-3:25 pm

1 stop17h 25m

San Francisco

Wed 5/27

6:30 am-11:20 am

2 stops20h 50m

$741

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 4/16

7:15 am-5:55 pm

1 stop18h 40m

San Francisco

Thu 4/30

7:40 pm-10:05 pm

1 stop18h 25m

$746

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 4/2

12:10 pm-8:00 pm

1 stop15h 50m

San Francisco

Wed 4/15

7:00 am-9:45 am

1 stop18h 45m

$750
Quickest round-trip

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 4/30

12:10 pm-8:00 pm

1 stop15h 50m

San Francisco

Thu 5/7

7:35 pm-6:30 pm

1 stop14h 55m

$751

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 4/2

6:00 am-3:25 pm

1 stop17h 25m

San Francisco

Mon 4/6

7:00 am-9:45 am

1 stop18h 45m

$754

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/14

6:00 am-8:00 pm

1 stop22h 00m

San Francisco

Wed 5/27

11:59 pm-6:55 am

1 stop22h 56m

$756

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/7

6:00 am-3:25 pm

1 stop17h 25m

San Francisco

Thu 5/14

2:00 pm-7:55 am

1 stop33h 55m

$759

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 4/2

6:00 am-8:00 pm

1 stop22h 00m

San Francisco

Wed 4/15

5:00 am-9:45 am

2 stops20h 45m

$760

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 5/1

6:20 am-7:00 pm

1 stop20h 40m

San Francisco

Fri 5/8

2:00 pm-7:55 am

1 stop33h 55m

$762

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 4/2

6:00 am-8:00 pm

1 stop22h 00m

San Francisco

Wed 4/15

5:00 am-9:45 am

2 stops20h 45m

$778

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 typical price of a round-trip flight between Porto and San Francisco?

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

You could potentially save up to 27% 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?

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 25m

Direct flights

None
The fastest flight from Porto to San Francisco takes 15h 25m
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 25m 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 $688Free CancellationRating
6.8
7,858 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
Walnut Creek
Roseville
Hayward
Berkeley
Santa Clara
Big Sur
Fremont
Calistoga
Vallejo
Salinas
Half Moon Bay
Daly City
Milpitas
Pacific Grove
South San Francisco

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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