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Cheap flights from Porto to San Francisco from $361

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 5/19. 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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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.
Lufthansa Logo
6:00 am - 3:55 pm
OPO
-
SFO
17h 55m
1 stop
Lufthansa Logo
10:40 pm - 11:40 pm
SFO
-
OPO
18h 00m
1 stop
$535Lufthansa
Thu, Feb 26 - Wed, Mar 11
United Airlines Logo
12:30 pm - 8:10 pm
OPO
-
SFO
15h 40m
1 stop
United Airlines Logo
7:00 am - 9:30 am
SFO
-
OPO
18h 30m
1 stop
$548United Airlines
Sun, Feb 15 - Sun, Mar 1
Lufthansa Logo
6:00 am - 4:55 pm
OPO
-
SFO
17h 55m
1 stop
Lufthansa Logo
2:35 pm - 12:50 pm
SFO
-
OPO
15h 15m
1 stop
$552Lufthansa
Tue, Mar 17 - Tue, Mar 24
KLM Logo
4:20 pm - 11:45 am
OPO
-
SFO
27h 25m
1 stop
KLM Logo
8:10 pm - 10:00 pm
SFO
-
OPO
17h 50m
1 stop
$553KLM
Fri, May 15 - Mon, May 18
United Airlines Logo
6:00 am - 9:20 pm
OPO
-
SFO
22h 20m
2 stops
United Airlines Logo
6:45 am - 9:30 am
SFO
-
OPO
19h 45m
2 stops
$554United Airlines
Tue, Mar 17 - Tue, Mar 24
SWISS Logo
12:05 pm - 4:30 pm
OPO
-
SFO
36h 25m
1 stop
SWISS Logo
11:55 am - 5:30 pm
SFO
-
OPO
22h 35m
2 stops
$557SWISS
Thu, Feb 26 - Wed, Mar 11
Delta Logo
5:00 am - 5:56 pm
OPO
-
SFO
20h 56m
2 stops
Delta Logo
9:15 am - 10:30 am
SFO
-
OPO
18h 15m
2 stops
$566Delta
Thu, Feb 26 - Wed, Mar 11
United Airlines Logo
12:30 pm - 12:40 pm
OPO
-
SFO
32h 10m
1 stop
United Airlines Logo
6:35 am - 9:30 am
SFO
-
OPO
18h 55m
2 stops
$569United Airlines
Sun, Feb 15 - Sun, Mar 1
United Airlines Logo
12:35 pm - 12:15 am
OPO
-
SFO
19h 40m
2 stops
United Airlines Logo
7:00 am - 9:30 am
SFO
-
OPO
19h 30m
1 stop
$578United Airlines
Thu, Feb 26 - Wed, Mar 11
SWISS Logo
4:10 pm - 5:30 pm
OPO
-
SFO
32h 20m
2 stops
SWISS Logo
8:25 pm - 6:30 pm
SFO
-
OPO
15h 05m
1 stop
$622SWISS
Sun, Mar 15 - Sun, Mar 22

KLM flights from Porto to San Francisco

Our best KLM deals on Porto to San Francisco flight tickets
KLM
May 15
OPO4:20 pmPorto
27h 25m
1 stop
SFO11:45 amSan Francisco
May 18
SFO8:10 pmSan Francisco
17h 50m
1 stop
OPO10:00 pmPorto
$553
KLM
Mar 18
OPO5:00 amPorto
19h 28m
2 stops
SFO5:28 pmSan Francisco
Mar 25
SFO9:15 amSan Francisco
18h 15m
2 stops
OPO10:30 amPorto
$770
KLM
Jun 18
OPO5:55 amPorto
20h 05m
1 stop
SFO6:00 pmSan Francisco
Jun 30
SFO1:45 pmSan Francisco
17h 45m
1 stop
OPO3:30 pmPorto
$830

Lufthansa flights from Porto to San Francisco

Our best Lufthansa deals on Porto to San Francisco flight tickets
Lufthansa
Feb 26
OPO6:00 amPorto
17h 55m
1 stop
SFO3:55 pmSan Francisco
Mar 11
SFO10:40 pmSan Francisco
18h 00m
1 stop
OPO11:40 pmPorto
$535
Lufthansa
Mar 17
OPO6:00 amPorto
17h 55m
1 stop
SFO4:55 pmSan Francisco
Mar 24
SFO2:35 pmSan Francisco
15h 15m
1 stop
OPO12:50 pmPorto
$552
Lufthansa
Mar 18
OPO12:30 pmPorto
15h 40m
1 stop
SFO9:10 pmSan Francisco
Mar 25
SFO10:40 pmSan Francisco
18h 00m
1 stop
OPO11:40 pmPorto
$738

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 February 2, 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

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 2/26

6:00 am-3:55 pm

1 stop17h 55m

San Francisco

Wed 3/11

10:40 pm-11:40 pm

1 stop18h 00m

$535

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sun 2/15

12:30 pm-8:10 pm

1 stop15h 40m

San Francisco

Sun 3/1

7:00 am-9:30 am

1 stop18h 30m

$548

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 3/17

6:00 am-4:55 pm

1 stop17h 55m

San Francisco

Tue 3/24

2:35 pm-12:50 pm

1 stop15h 15m

$552

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 5/15

4:20 pm-11:45 am

1 stop27h 25m

San Francisco

Mon 5/18

8:10 pm-10:00 pm

1 stop17h 50m

$553

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Tue 3/17

6:00 am-9:20 pm

2 stops22h 20m

San Francisco

Tue 3/24

6:45 am-9:30 am

2 stops19h 45m

$554

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 2/26

12:05 pm-4:30 pm

1 stop36h 25m

San Francisco

Wed 3/11

11:55 am-5:30 pm

2 stops22h 35m

$557

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 2/26

5:00 am-5:56 pm

2 stops20h 56m

San Francisco

Wed 3/11

9:15 am-10:30 am

2 stops18h 15m

$566

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sun 2/15

12:30 pm-12:40 pm

1 stop32h 10m

San Francisco

Sun 3/1

6:35 am-9:30 am

2 stops18h 55m

$569

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 2/26

12:35 pm-12:15 am

2 stops19h 40m

San Francisco

Wed 3/11

7:00 am-9:30 am

1 stop19h 30m

$578

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sun 3/15

4:10 pm-5:30 pm

2 stops32h 20m

San Francisco

Sun 3/22

8:25 pm-6:30 pm

1 stop15h 05m

$622

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 March, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $681.

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

You could potentially save up to 17% 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 February 2026, prices for Porto to San Francisco flights are approximately 16% 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

Fastest flight time

14h 45m

Direct flights

None
The fastest flight from Porto to San Francisco takes 14h 45m
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 14h 45m 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
7,758 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
Santa Clara
Walnut Creek
Berkeley
Big Sur
Fremont
Half Moon Bay
Daly City
Salinas
Vallejo
Sunnyvale
Livermore
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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