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Cheap flights from Porto to San Francisco from $333

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 5/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Porto to San Francisco

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from Porto to San Francisco.
6:30 am - 11:45 amOPO-SFO
37h 15m1 stop
3:05 pm - 3:30 pmSFO-OPO
16h 25m1 stop
$609KLM
Find Deal
Thu, May 22 - Thu, May 29
6:35 am - 11:45 amOPO-SFO
37h 10m1 stop
8:45 pm - 3:30 pmSFO-OPO
34h 45m1 stop
$610KLM
Find Deal
Mon, Apr 28 - Mon, May 5
8:15 am - 4:10 pmOPO-SFO
15h 55m1 stop
3:50 pm - 8:20 pmSFO-OPO
20h 30m2 stops
$616British Airways
Find Deal
Thu, May 8 - Thu, May 15
6:30 am - 11:45 amOPO-SFO
37h 15m1 stop
1:45 pm - 7:40 pmSFO-OPO
21h 55m1 stop
$618KLM
Find Deal
Thu, May 8 - Thu, May 15
12:20 pm - 9:25 amOPO-SFO
29h 05m2 stops
7:30 pm - 7:50 pmSFO-OPO
16h 20m1 stop
$622British Airways
Find Deal
Mon, May 19 - Mon, May 26
4:20 pm - 11:45 amOPO-SFO
27h 25m2 stops
8:45 pm - 3:30 pmSFO-OPO
34h 45m1 stop
$633Air France
Find Deal
Mon, Apr 28 - Mon, May 5
6:35 am - 10:43 pmOPO-SFO
24h 08m2 stops
3:05 pm - 3:30 pmSFO-OPO
16h 25m1 stop
$639Delta
Find Deal
Mon, Apr 14 - Mon, Apr 28
6:20 am - 10:56 pmOPO-SFO
24h 36m2 stops
8:58 am - 3:35 pmSFO-OPO
22h 37m2 stops
$645Delta
Find Deal
Tue, Apr 29 - Thu, May 8
6:15 am - 2:35 pmOPO-SFO
16h 20m1 stop
9:05 pm - 11:20 pmSFO-OPO
18h 15m1 stop
$779Lufthansa
Find Deal
Thu, Apr 17 - Thu, Apr 24
12:10 pm - 12:40 pmOPO-SFO
32h 30m1 stop
7:25 pm - 10:45 pmSFO-OPO
19h 20m1 stop
$808Lufthansa
Find Deal
Mon, Jun 2 - Wed, Sep 10

KLM flights from Porto to San Francisco

Our best KLM deals on Porto to San Francisco flight tickets
KLM
May 22
OPO6:30 amPorto
37h 15m
1 stop
SFO11:45 amSan Francisco
May 29
SFO3:05 pmSan Francisco
16h 25m
1 stop
OPO3:30 pmPorto
KLM
Apr 28
OPO6:35 amPorto
37h 10m
1 stop
SFO11:45 amSan Francisco
May 5
SFO8:45 pmSan Francisco
34h 45m
1 stop
OPO3:30 pmPorto
KLM
May 8
OPO6:30 amPorto
37h 15m
1 stop
SFO11:45 amSan Francisco
May 15
SFO1:45 pmSan Francisco
21h 55m
1 stop
OPO7:40 pmPorto

British Airways flights from Porto to San Francisco

Our best British Airways deals on Porto to San Francisco flight tickets
British Airways
May 8
OPO8:15 amPorto
15h 55m
1 stop
SFO4:10 pmSan Francisco
May 15
SFO3:50 pmSan Francisco
20h 30m
2 stops
OPO8:20 pmPorto
British Airways
May 19
OPO12:20 pmPorto
29h 05m
2 stops
SFO9:25 amSan Francisco
May 26
SFO7:30 pmSan Francisco
16h 20m
1 stop
OPO7:50 pmPorto
British Airways
Apr 28
OPO12:20 pmPorto
20h 10m
2 stops
SFO12:30 amSan Francisco
May 5
SFO2:17 pmSan Francisco
21h 33m
2 stops
OPO7:50 pmPorto

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 February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $683.

What is the cheapest day to depart on your flight to San Francisco?

The cheapest day to depart from Porto to San Francisco is on a Wednesday when prices can be found for as low as $668. The most expensive day to fly to San Francisco is Saturday, with ticket prices averaging around $941.

What is the cheapest time of day to depart on your flight to San Francisco?

Our data shows that the cheapest Porto to San Francisco flights are usually those with departure times in the morning. Our users have found flights to San Francisco in the morning for as low as $818. Flights in the morning are often more expensive with an average ticket price of $818.

How far in advance should I book a flight to San Francisco?

You are more likely to see cheaper flights to San Francisco from Porto when booking 22 weeks ahead of your departure date. In general, you can expect to find flights to San Francisco for around $873 when searching 22 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Francisco from Porto for as low as $664 on momondo.

How have Porto to San Francisco flight prices changed over time?

As of March 2025, prices for Porto to San Francisco flights are approximately 11% 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

Best Price Found

$333

Fastest flight time

14h 45m

Direct flights

None

Airports in San Francisco

1 airport
The best one-way flight to San Francisco from Porto in the past 72 hours is $333. The best round-trip flight deal from Porto to San Francisco found on momondo in the last 72 hours is $609.
The fastest flight from Porto to San Francisco takes 14h 45m
There are no direct flights from Porto to San Francisco. Popular non-direct route for this connection is Porto Airport - San Francisco Airport.
There is 1 airport near San Francisco: San Francisco (SFO)

  • How far is Porto to San Francisco by plane?

    There are 5565.0 mi between Porto and San Francisco. Typically, this will take 15h 26m 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 $665Free CancellationRating
6.7
6,955 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
Hayward
Modesto
Calistoga
Roseville
Santa Clara
Daly City
Sonoma
Fremont
South San Francisco
Bodega Bay
Sunnyvale
Redwood City
Big Sur
Vallejo
Berkeley
Walnut Creek
Palo Alto
Half Moon Bay

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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