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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 11/5. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Porto to San Francisco

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
Delta Logo
3:05 pm - 10:00 pm
SFO
-
OPO
22h 55m
1 stop
$752Delta
Wed, Sep 23 - Wed, Oct 7
Delta Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
Delta Logo
3:05 pm - 10:00 pm
SFO
-
OPO
22h 55m
1 stop
$753Delta
Wed, Sep 23 - Wed, Oct 7
Delta Logo
5:00 am - 5:15 pm
OPO
-
SFO
20h 15m
2 stops
Delta Logo
11:05 am - 3:25 pm
SFO
-
OPO
20h 20m
2 stops
$758Delta
Wed, Sep 23 - Wed, Oct 7
Delta Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
Delta Logo
11:30 am - 3:25 pm
SFO
-
OPO
19h 55m
2 stops
$759Delta
Fri, Sep 25 - Tue, Oct 6
Iberia Logo
8:20 am - 9:52 pm
OPO
-
SFO
21h 32m
2 stops
Iberia Logo
1:59 pm - 4:00 pm
SFO
-
OPO
18h 01m
2 stops
$760Iberia
Wed, Sep 23 - Wed, Oct 7
Delta Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
Delta Logo
11:05 am - 3:25 pm
SFO
-
OPO
20h 20m
2 stops
$761Delta
Wed, Sep 23 - Wed, Oct 7
Multiple Airlines Logo
7:00 pm - 11:45 am
OPO
-
SFO
24h 45m
1 stop
Multiple Airlines Logo
8:10 pm - 10:05 pm
SFO
-
OPO
17h 55m
1 stop
$764Multiple Airlines
Sat, Sep 26 - Tue, Oct 6
Delta Logo
5:00 am - 4:02 pm
OPO
-
SFO
19h 02m
2 stops
Delta Logo
6:00 am - 10:35 am
SFO
-
OPO
21h 35m
2 stops
$766Delta
Sat, Oct 24 - Tue, Oct 27
KLM Logo
11:35 am - 11:45 am
OPO
-
SFO
32h 10m
1 stop
KLM Logo
8:10 pm - 10:05 pm
SFO
-
OPO
17h 55m
1 stop
$775KLM
Sat, Sep 26 - Tue, Oct 6
KLM Logo
11:35 am - 11:45 am
OPO
-
SFO
32h 10m
1 stop
KLM Logo
8:10 pm - 10:05 pm
SFO
-
OPO
17h 55m
1 stop
$788KLM
Sat, Sep 26 - Tue, Oct 6

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KLM flights from Porto to San Francisco

Our best KLM deals on Porto to San Francisco flight tickets
KLM
Sep 26
OPO11:35 amPorto
32h 10m
1 stop
SFO11:45 amSan Francisco
Oct 6
SFO8:10 pmSan Francisco
17h 55m
1 stop
OPO10:05 pmPorto
$775
KLM
Sep 26
OPO11:35 amPorto
32h 10m
1 stop
SFO11:45 amSan Francisco
Oct 6
SFO8:10 pmSan Francisco
17h 55m
1 stop
OPO10:05 pmPorto
$788
KLM
Sep 26
OPO4:25 pmPorto
28h 25m
1 stop
SFO12:50 pmSan Francisco
Oct 6
SFO3:05 pmSan Francisco
23h 00m
1 stop
OPO10:05 pmPorto
$836

American Airlines flights from Porto to San Francisco

Our best American Airlines deals on Porto to San Francisco flight tickets
American Airlines
Jun 25
OPO12:25 pmPorto
20h 27m
2 stops
SFO12:52 amSan Francisco
Jul 8
SFO6:15 amSan Francisco
17h 25m
2 stops
OPO7:40 amPorto
$863
American Airlines
Jul 8
OPO12:25 pmPorto
20h 18m
2 stops
SFO12:43 amSan Francisco
Jul 18
SFO5:55 pmSan Francisco
14h 05m
1 stop
OPO4:00 pmPorto
$867
American Airlines
Jul 8
OPO12:25 pmPorto
20h 18m
2 stops
SFO12:43 amSan Francisco
Jul 18
SFO8:04 amSan Francisco
19h 41m
2 stops
OPO11:45 amPorto
$872

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 June 20, 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

Wed 9/23

5:00 am-11:45 am

1 stop14h 45m

San Francisco

Wed 10/7

3:05 pm-10:00 pm

1 stop22h 55m

$752

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 9/23

5:00 am-11:45 am

1 stop14h 45m

San Francisco

Wed 10/7

3:05 pm-10:00 pm

1 stop22h 55m

$753

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 9/23

5:00 am-5:15 pm

2 stops20h 15m

San Francisco

Wed 10/7

11:05 am-3:25 pm

2 stops20h 20m

$758
Quickest round-trip

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 9/25

5:00 am-11:45 am

1 stop14h 45m

San Francisco

Tue 10/6

11:30 am-3:25 pm

2 stops19h 55m

$759

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 9/23

8:20 am-9:52 pm

2 stops21h 32m

San Francisco

Wed 10/7

1:59 pm-4:00 pm

2 stops18h 01m

$760

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Wed 9/23

5:00 am-11:45 am

1 stop14h 45m

San Francisco

Wed 10/7

11:05 am-3:25 pm

2 stops20h 20m

$761

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 9/26

7:00 pm-11:45 am

1 stop24h 45m

San Francisco

Tue 10/6

8:10 pm-10:05 pm

1 stop17h 55m

$764

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 10/24

5:00 am-4:02 pm

2 stops19h 02m

San Francisco

Tue 10/27

6:00 am-10:35 am

2 stops21h 35m

$766

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 9/26

11:35 am-11:45 am

1 stop32h 10m

San Francisco

Tue 10/6

8:10 pm-10:05 pm

1 stop17h 55m

$775

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Sat 9/26

11:35 am-11:45 am

1 stop32h 10m

San Francisco

Tue 10/6

8:10 pm-10:05 pm

1 stop17h 55m

$788

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 January, then flying in April is also cheap. Prices for this month can be found on momondo for an average of $722.

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

You could potentially save up to 14% 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

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.
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Frequently asked questions about flying from Porto to San Francisco

  • 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 $688Free CancellationRating
6.8
8,082 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
Hayward
Bodega Bay
Roseville
Fremont
Walnut Creek
Santa Clara
South San Francisco
Berkeley
Vallejo
Sunnyvale
Salinas
Big Sur
Pacific Grove
Daly City
Burlingame
Calistoga

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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