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Cheap flights from Porto to San Francisco from $415

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 6/2. 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.
Multiple Airlines Logo
6:00 pm - 2:30 pm
OPO
-
SFO
28h 30m
3 stops
Multiple Airlines Logo
4:30 pm - 10:35 am
SFO
-
OPO
34h 05m
3 stops
$759Multiple Airlines
Thu, May 14 - Thu, May 28
Multiple Airlines Logo
5:20 pm - 2:30 pm
OPO
-
SFO
29h 10m
2 stops
Multiple Airlines Logo
4:30 pm - 8:00 am
SFO
-
OPO
31h 30m
3 stops
$761Multiple Airlines
Thu, May 14 - Thu, May 28
Multiple Airlines Logo
10:00 pm - 2:30 pm
OPO
-
SFO
24h 30m
2 stops
Multiple Airlines Logo
4:30 pm - 10:05 pm
SFO
-
OPO
21h 35m
2 stops
$794Multiple Airlines
Thu, May 14 - Thu, May 28
Delta Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
Delta Logo
2:43 pm - 10:00 pm
SFO
-
OPO
23h 17m
2 stops
$797Delta
Fri, May 15 - Mon, May 18
Delta Logo
5:00 am - 3:58 pm
OPO
-
SFO
18h 58m
2 stops
Delta Logo
3:05 pm - 10:00 pm
SFO
-
OPO
22h 55m
1 stop
$802Delta
Thu, May 14 - Thu, May 28
Multiple Airlines Logo
11:25 am - 11:45 am
OPO
-
SFO
32h 20m
1 stop
Multiple Airlines Logo
7:00 am - 10:30 am
SFO
-
OPO
19h 30m
1 stop
$803Multiple Airlines
Thu, May 14 - Wed, May 27
British Airways Logo
12:25 pm - 11:54 pm
OPO
-
SFO
19h 29m
2 stops
British Airways Logo
4:35 pm - 7:05 pm
SFO
-
OPO
18h 30m
1 stop
$805British Airways
Thu, May 14 - Wed, May 27
Delta Logo
5:00 am - 6:58 pm
OPO
-
SFO
21h 58m
2 stops
Delta Logo
11:30 am - 10:30 am
SFO
-
OPO
15h 00m
1 stop
$808Delta
Mon, Jun 15 - Mon, Jun 22
Delta Logo
5:00 am - 4:57 pm
OPO
-
SFO
19h 57m
2 stops
Delta Logo
4:55 pm - 10:15 pm
SFO
-
OPO
21h 20m
2 stops
$810Delta
Thu, May 14 - Wed, May 27
Delta Logo
5:00 am - 11:45 am
OPO
-
SFO
14h 45m
1 stop
Delta Logo
2:43 pm - 10:00 pm
SFO
-
OPO
23h 17m
2 stops
$826Delta
Fri, May 15 - Mon, May 18

KLM flights from Porto to San Francisco

Our best KLM deals on Porto to San Francisco flight tickets
KLM
May 16
OPO11:45 amPorto
32h 00m
1 stop
SFO11:45 amSan Francisco
May 26
SFO1:45 pmSan Francisco
24h 30m
1 stop
OPO10:15 pmPorto
$827
KLM
Jun 2
OPO5:00 amPorto
14h 45m
1 stop
SFO11:45 amSan Francisco
Jun 8
SFO7:00 amSan Francisco
19h 30m
1 stop
OPO10:30 amPorto
$830
KLM
May 31
OPO12:25 pmPorto
20h 14m
1 stop
SFO12:39 amSan Francisco
Jun 7
SFO11:57 pmSan Francisco
26h 33m
1 stop
OPO10:30 amPorto
$844

United Airlines flights from Porto to San Francisco

Our best United Airlines deals on Porto to San Francisco flight tickets
United Airlines
May 14
OPO6:00 amPorto
17h 25m
1 stop
SFO3:25 pmSan Francisco
May 28
SFO11:59 pmSan Francisco
22h 56m
1 stop
OPO6:55 amPorto
$873
United Airlines
May 16
OPO6:00 amPorto
22h 23m
2 stops
SFO8:23 pmSan Francisco
May 26
SFO9:15 pmSan Francisco
25h 40m
1 stop
OPO6:55 amPorto
$879
United Airlines
Jun 15
OPO6:00 amPorto
36h 45m
2 stops
SFO10:45 amSan Francisco
Jun 22
SFO5:05 amSan Francisco
17h 55m
2 stops
OPO7:00 amPorto
$882

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 May 4, 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 pm-2:30 pm

3 stops28h 30m

San Francisco

Thu 5/28

4:30 pm-10:35 am

3 stops34h 05m

$759

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/14

5:20 pm-2:30 pm

2 stops29h 10m

San Francisco

Thu 5/28

4:30 pm-8:00 am

3 stops31h 30m

$761

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/14

10:00 pm-2:30 pm

2 stops24h 30m

San Francisco

Thu 5/28

4:30 pm-10:05 pm

2 stops21h 35m

$794

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 5/15

5:00 am-11:45 am

1 stop14h 45m

San Francisco

Mon 5/18

2:43 pm-10:00 pm

2 stops23h 17m

$797

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/14

5:00 am-3:58 pm

2 stops18h 58m

San Francisco

Thu 5/28

3:05 pm-10:00 pm

1 stop22h 55m

$802

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/14

11:25 am-11:45 am

1 stop32h 20m

San Francisco

Wed 5/27

7:00 am-10:30 am

1 stop19h 30m

$803

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/14

12:25 pm-11:54 pm

2 stops19h 29m

San Francisco

Wed 5/27

4:35 pm-7:05 pm

1 stop18h 30m

$805
Quickest round-trip

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Mon 6/15

5:00 am-6:58 pm

2 stops21h 58m

San Francisco

Mon 6/22

11:30 am-10:30 am

1 stop15h 00m

$808

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Thu 5/14

5:00 am-4:57 pm

2 stops19h 57m

San Francisco

Wed 5/27

4:55 pm-10:15 pm

2 stops21h 20m

$810

PortoSan Francisco

OPO - SFO

OPOSFO

Porto

Fri 5/15

5:00 am-11:45 am

1 stop14h 45m

San Francisco

Mon 5/18

2:43 pm-10:00 pm

2 stops23h 17m

$826

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 November is also cheap. Prices for this month can be found on momondo for an average of $727.

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

You could potentially save up to 12% 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.
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 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
7,972 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
Vallejo
Fremont
Big Sur
Calistoga
Daly City
South San Francisco
Pacific Grove
Sunnyvale
Salinas
Milpitas

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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