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Cheap flights from Porto to San Francisco from $349

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 6/11. 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.
 Logo
4:20 pm - 11:45 amOPO-SFO
27h 25m1 stop
 Logo
3:05 pm - 3:30 pmSFO-OPO
16h 25m1 stop
Mon, Apr 28 - Tue, May 13
Delta Logo
6:35 am - 7:00 pmOPO-SFO
20h 25m2 stops
Delta Logo
8:58 am - 3:30 pmSFO-OPO
22h 32m2 stops
$667Delta
Find Deal
Mon, Apr 28 - Tue, May 13
KLM Logo
6:20 am - 11:45 amOPO-SFO
37h 25m1 stop
KLM Logo
1:45 pm - 10:15 pmSFO-OPO
24h 30m1 stop
$670KLM
Find Deal
Tue, Apr 29 - Thu, May 8
KLM Logo
6:20 am - 6:43 pmOPO-SFO
20h 23m2 stops
KLM Logo
1:45 pm - 10:15 pmSFO-OPO
24h 30m1 stop
$677KLM
Find Deal
Tue, Apr 29 - Thu, May 8
Delta Logo
4:20 pm - 12:50 pmOPO-SFO
28h 30m1 stop
Delta Logo
3:05 pm - 3:30 pmSFO-OPO
16h 25m1 stop
$680Delta
Find Deal
Mon, Apr 28 - Tue, May 13
British Airways Logo
9:10 pm - 5:15 pmOPO-SFO
28h 05m1 stop
British Airways Logo
7:30 pm - 7:30 pmSFO-OPO
16h 00m1 stop
$697British Airways
Find Deal
Mon, Apr 28 - Tue, May 13
Lufthansa Logo
11:05 am - 7:00 pmOPO-SFO
15h 55m1 stop
Lufthansa Logo
9:05 pm - 11:20 pmSFO-OPO
18h 15m1 stop
$716Lufthansa
Find Deal
Fri, May 2 - Mon, May 12
United Airlines Logo
12:35 pm - 7:38 amOPO-SFO
27h 03m2 stops
United Airlines Logo
6:00 am - 6:55 amSFO-OPO
16h 55m2 stops
$726United Airlines
Find Deal
Sat, May 31 - Sat, Jun 7
British Airways Logo
11:45 am - 4:58 pmOPO-SFO
37h 13m2 stops
British Airways Logo
4:20 pm - 7:30 pmSFO-OPO
19h 10m1 stop
$736British Airways
Find Deal
Mon, Apr 28 - Tue, May 13
United Airlines Logo
6:00 am - 3:55 pmOPO-SFO
17h 55m1 stop
United Airlines Logo
7:00 am - 6:55 amSFO-OPO
15h 55m1 stop
$771United Airlines
Find Deal
Fri, Jun 6 - Sun, Jun 29

KLM flights from Porto to San Francisco

Our best KLM deals on Porto to San Francisco flight tickets
KLM
Apr 29
OPO6:20 amPorto
37h 25m
1 stop
SFO11:45 amSan Francisco
May 8
SFO1:45 pmSan Francisco
24h 30m
1 stop
OPO10:15 pmPorto
KLM
Apr 29
OPO6:20 amPorto
20h 23m
2 stops
SFO6:43 pmSan Francisco
May 8
SFO1:45 pmSan Francisco
24h 30m
1 stop
OPO10:15 pmPorto
KLM
May 7
OPO8:10 pmPorto
23h 35m
1 stop
SFO11:45 amSan Francisco
May 21
SFO8:25 pmSan Francisco
28h 00m
1 stop
OPO8:25 amPorto

Delta flights from Porto to San Francisco

Our best Delta deals on Porto to San Francisco flight tickets
Delta
Apr 28
OPO6:35 amPorto
20h 25m
2 stops
SFO7:00 pmSan Francisco
May 13
SFO8:58 amSan Francisco
22h 32m
2 stops
OPO3:30 pmPorto
Delta
Apr 28
OPO4:20 pmPorto
28h 30m
1 stop
SFO12:50 pmSan Francisco
May 13
SFO3:05 pmSan Francisco
16h 25m
1 stop
OPO3:30 pmPorto
Delta
Apr 29
OPO6:20 amPorto
22h 17m
2 stops
SFO8:37 pmSan Francisco
May 8
SFO10:00 amSan Francisco
21h 35m
2 stops
OPO3:35 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 $877 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 April 2025, prices for Porto to San Francisco flights are approximately 13% 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

$349

Fastest flight time

14h 50m

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 $349. The best round-trip flight deal from Porto to San Francisco found on momondo in the last 72 hours is $661.
The fastest flight from Porto to San Francisco takes 14h 50m
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 30m 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
7,011 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
Sonoma
Bodega Bay
Daly City
Santa Clara
Fremont
South San Francisco
Big Sur
Sunnyvale
Redwood City
Walnut Creek
Berkeley
Vallejo
Palo Alto
Fairfield

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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