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Cheap flights from Porto to San Francisco from $405

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 9/14. 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.
Multiple Airlines Logo
4:50 pm - 2:40 pmOPO  Porto-SFO San Francisco
29h 50m3 stops Barcelona-El Prat Milan Malpensa Kastrup Copenhagen
Multiple Airlines Logo
4:45 pm - 8:00 amSFO  San Francisco-OPO Porto
31h 15m3 stops Kastrup Copenhagen Milan Malpensa Barcelona-El Prat
$680Multiple Airlines
Tue, Oct 6 - Wed, Oct 14
Multiple Airlines Logo
8:15 pm - 2:40 pmOPO  Porto-SFO San Francisco
26h 25m2 stops Milan Malpensa Kastrup Copenhagen
Multiple Airlines Logo
4:45 pm - 7:45 pmSFO  San Francisco-OPO Porto
19h 00m2 stops Kastrup Copenhagen Milan Malpensa
$683Multiple Airlines
Wed, Sep 23 - Wed, Oct 7
Multiple Airlines Logo
9:15 am - 1:15 pmOPO  Porto-SFO San Francisco
36h 00m2 stops Madrid Barajas Rome Fiumicino
Multiple Airlines Logo
3:15 pm - 9:00 pmSFO  San Francisco-OPO Porto
21h 45m2 stops Rome Fiumicino Madrid Barajas
$704Multiple Airlines
Mon, Sep 14 - Mon, Sep 21
TAP AIR PORTUGAL Logo
6:00 pm - 1:35 pmOPO  Porto-SFO San Francisco
27h 35m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
4:30 pm - 5:00 pmSFO  San Francisco-OPO Porto
16h 30m1 stop Lisbon Humberto Delgado
$710TAP AIR PORTUGAL
Mon, Sep 21 - Mon, Oct 5
Multiple Airlines Logo
11:55 am - 1:15 pmOPO  Porto-SFO San Francisco
33h 20m2 stops Valencia Rome Fiumicino
Multiple Airlines Logo
3:15 pm - 11:40 pmSFO  San Francisco-OPO Porto
24h 25m2 stops Rome Fiumicino Valencia
$710Multiple Airlines
Thu, Sep 3 - Wed, Sep 16
Multiple Airlines Logo
4:50 pm - 2:40 pmOPO  Porto-SFO San Francisco
29h 50m3 stops Barcelona-El Prat Milan Malpensa Kastrup Copenhagen
Multiple Airlines Logo
4:45 pm - 8:15 pmSFO  San Francisco-OPO Porto
19h 30m2 stops Kastrup Copenhagen Milan Malpensa
$720Multiple Airlines
Tue, Oct 6 - Wed, Oct 14
TAP AIR PORTUGAL Logo
6:00 pm - 1:35 pmOPO  Porto-SFO San Francisco
27h 35m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
4:30 pm - 5:00 pmSFO  San Francisco-OPO Porto
16h 30m1 stop Lisbon Humberto Delgado
$723TAP AIR PORTUGAL
Mon, Sep 21 - Mon, Oct 5
Multiple Airlines Logo
11:50 am - 1:15 pmOPO  Porto-SFO San Francisco
33h 25m2 stops Valencia Rome Fiumicino
Multiple Airlines Logo
3:15 pm - 6:50 amSFO  San Francisco-OPO Porto
31h 35m3 stops Rome Fiumicino Valencia Madrid Barajas
$723Multiple Airlines
Tue, Sep 15 - Tue, Sep 22
Lufthansa Logo
6:20 am - 7:00 pmOPO  Porto-SFO San Francisco
20h 40m1 stop Munich Franz Josef Strauss
Lufthansa Logo
2:40 pm - 3:40 pmSFO  San Francisco-OPO Porto
17h 00m1 stop Frankfurt am Main
$832Lufthansa
Mon, Sep 21 - Mon, Oct 5
Lufthansa Logo
6:00 am - 7:55 pmOPO  Porto-SFO San Francisco
21h 55m1 stop Frankfurt am Main
Lufthansa Logo
9:05 pm - 11:25 pmSFO  San Francisco-OPO Porto
18h 20m1 stop Munich Franz Josef Strauss
$858Lufthansa
Thu, Sep 24 - Wed, Sep 30

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Iberia flights from Porto to San Francisco

Our best Iberia deals on Porto to San Francisco flight tickets
Iberia
Sep 21
OPO8:40 pmPorto
27h 40m
1 stop
SFO4:20 pmSan Francisco
Oct 5
SFO10:03 pmSan Francisco
25h 37m
2 stops
OPO7:40 amPorto
$791
Iberia
Sep 1
OPO8:20 amPorto
22h 20m
2 stops
SFO10:40 pmSan Francisco
Sep 8
SFO2:08 pmSan Francisco
17h 52m
2 stops
OPO4:00 pmPorto
$796
Iberia
Sep 14
OPO8:40 pmPorto
27h 40m
1 stop
SFO4:20 pmSan Francisco
Sep 21
SFO4:35 pmSan Francisco
19h 25m
2 stops
OPO8:00 pmPorto
$805

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
Sep 21
OPO6:00 pmPorto
27h 35m
1 stop
SFO1:35 pmSan Francisco
Oct 5
SFO4:30 pmSan Francisco
16h 30m
1 stop
OPO5:00 pmPorto
$710
TAP AIR PORTUGAL
Sep 23
OPO6:00 pmPorto
28h 30m
1 stop
SFO2:30 pmSan Francisco
Oct 7
SFO4:35 pmSan Francisco
19h 50m
1 stop
OPO8:25 pmPorto
$726
TAP AIR PORTUGAL
Sep 22
OPO6:00 pmPorto
28h 35m
1 stop
SFO2:35 pmSan Francisco
Oct 1
SFO4:30 pmSan Francisco
14h 30m
1 stop
OPO3:00 pmPorto
$728

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 August 6, 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 Porto - SFO San Francisco

OPOSFO

Porto

Tue 10/6

4:50 pm-2:40 pm

3 stops29h 50m

San Francisco

Wed 10/14

4:45 pm-8:00 am

3 stops31h 15m

$680

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Wed 9/23

8:15 pm-2:40 pm

2 stops26h 25m

San Francisco

Wed 10/7

4:45 pm-7:45 pm

2 stops19h 00m

$683

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Mon 9/14

9:15 am-1:15 pm

2 stops36h 00m

San Francisco

Mon 9/21

3:15 pm-9:00 pm

2 stops21h 45m

$704

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Mon 9/21

6:00 pm-1:35 pm

1 stop27h 35m

San Francisco

Mon 10/5

4:30 pm-5:00 pm

1 stop16h 30m

$710

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Thu 9/3

11:55 am-1:15 pm

2 stops33h 20m

San Francisco

Wed 9/16

3:15 pm-11:40 pm

2 stops24h 25m

$710

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Tue 10/6

4:50 pm-2:40 pm

3 stops29h 50m

San Francisco

Wed 10/14

4:45 pm-8:15 pm

2 stops19h 30m

$720

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Mon 9/21

6:00 pm-1:35 pm

1 stop27h 35m

San Francisco

Mon 10/5

4:30 pm-5:00 pm

1 stop16h 30m

$723

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Tue 9/15

11:50 am-1:15 pm

2 stops33h 25m

San Francisco

Tue 9/22

3:15 pm-6:50 am

3 stops31h 35m

$723
Quickest round-trip

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Mon 9/21

6:20 am-7:00 pm

1 stop20h 40m

San Francisco

Mon 10/5

2:40 pm-3:40 pm

1 stop17h 00m

$832

PortoSan Francisco

OPO Porto - SFO San Francisco

OPOSFO

Porto

Thu 9/24

6:00 am-7:55 pm

1 stop21h 55m

San Francisco

Wed 9/30

9:05 pm-11:25 pm

1 stop18h 20m

$858

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?

Prices are currently low for flights on this route.

Typical prices usually range from $764 to $980.
The lowest price recently found on this route was $680.

What is the cheapest month to fly to San Francisco?

If you aren’t able to travel to San Francisco during the month of November, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $704.

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

You could potentially save up to 16% 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

17h 00m

Direct flights

None
The fastest flight from Porto to San Francisco takes 17h 00m
There are no direct flights from Porto to San Francisco. There are no popular flight routes from Porto to San Francisco.
Search flight deals

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 17h 00m 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
8,177 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
South San Francisco
Fremont
Berkeley
Hayward
Walnut Creek
Bodega Bay
Roseville
Sonoma
Santa Clara
Vallejo
Salinas
Sunnyvale
Milpitas
Daly City
Burlingame
Turlock
Marina

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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