OPO - SFO

$380 Find Cheap Flights from Porto to San Francisco

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Porto to San Francisco departing on 5/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to San Francisco

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to San Francisco, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to San Francisco, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$592
Typical prices: $727-$873
Multiple Airlines
Mon 4/13Sun 4/26
OPO - SFO • 1 stop
Cheapest one-way
$380
Typical prices: $554-$683
Multiple Airlines
Tue 5/12
OPO - SFO • 3 stops
Top airlines
Iberia
Cheapest • from $702 (round-trip)
Lufthansa
Best reviews • 6.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Porto and San Francisco. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Munich (MUC)
Cheapest • Avg $731 (round-trip)
Montreal (YUL)
Shortest trip • 15h 27m (one-way)
Insights
Insights
Insights
Insights
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Francisco!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Porto to San Francisco (OPO-SFO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to San Francisco that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Porto to San Francisco

Mon, Apr 13 - Sun, Apr 26
Multiple Airlines Logo
10:00 pm - 5:55 pm
OPO
-
SFO
27h 55m
1 stop
Multiple Airlines Logo
7:40 pm - 8:00 am
SFO
-
OPO
28h 20m
1 stop
$592Multiple Airlines
Mon, Apr 13 - Sun, Apr 26
Multiple Airlines Logo
10:00 pm - 5:55 pm
OPO
-
SFO
27h 55m
1 stop
Multiple Airlines Logo
7:40 pm - 7:10 am
SFO
-
OPO
27h 30m
1 stop
$594Multiple Airlines
Mon, Apr 13 - Sun, Apr 26
Multiple Airlines Logo
10:00 pm - 5:55 pm
OPO
-
SFO
27h 55m
1 stop
Multiple Airlines Logo
7:40 pm - 9:20 pm
SFO
-
OPO
17h 40m
1 stop
$612Multiple Airlines
Thu, Apr 9 - Thu, Apr 16
Multiple Airlines Logo
7:15 am - 5:55 pm
OPO
-
SFO
18h 40m
1 stop
Multiple Airlines Logo
7:40 pm - 12:05 pm
SFO
-
OPO
32h 25m
1 stop
$614Multiple Airlines
Thu, Apr 9 - Thu, Apr 16
Multiple Airlines Logo
5:20 pm - 4:50 pm
OPO
-
SFO
31h 30m
2 stops
Multiple Airlines Logo
7:40 pm - 12:05 pm
SFO
-
OPO
32h 25m
1 stop
$631Multiple Airlines
Mon, Apr 13 - Sun, Apr 26
Multiple Airlines Logo
10:00 pm - 5:55 pm
OPO
-
SFO
27h 55m
1 stop
Multiple Airlines Logo
7:40 pm - 8:00 am
SFO
-
OPO
28h 20m
1 stop
$647Multiple Airlines
Mon, Apr 13 - Sun, Apr 26
Multiple Airlines Logo
10:00 pm - 2:35 pm
OPO
-
SFO
24h 35m
2 stops
Multiple Airlines Logo
7:40 pm - 7:10 am
SFO
-
OPO
27h 30m
1 stop
$657Multiple Airlines
Mon, Apr 13 - Sun, Apr 26
Multiple Airlines Logo
10:25 pm - 12:45 pm
OPO
-
SFO
46h 20m
2 stops
Multiple Airlines Logo
7:40 pm - 9:55 pm
SFO
-
OPO
18h 15m
1 stop
$662Multiple Airlines
Mon, Apr 13 - Sun, Apr 26
Multiple Airlines Logo
10:00 pm - 2:35 pm
OPO
-
SFO
24h 35m
2 stops
Multiple Airlines Logo
7:40 pm - 9:55 pm
SFO
-
OPO
18h 15m
1 stop
$670Multiple Airlines
Tue, Apr 7 - Tue, Apr 14
Multiple Airlines Logo
9:30 pm - 4:35 pm
OPO
-
SFO
51h 05m
2 stops
Multiple Airlines Logo
7:40 pm - 11:55 pm
SFO
-
OPO
20h 15m
1 stop
$687Multiple Airlines
Booking Insights

KAYAK's insights & trends for Porto to San Francisco flights

Get data-powered insights and trends into flights from Porto to San Francisco to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Porto to San Francisco?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Porto to San Francisco departing in April.
Find deals

Good to know

Cheapest flight$380
Most popular time to fly and prices are also 8% lower on average.
Flight from Porto to San Francisco

When to book flights from Porto to San Francisco

Are your dates flexible? Find out the best times to travel from Porto to San Francisco based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Porto to San Francisco

  • What is the cheapest flight from Porto to San Francisco?

    In the last 3 days, the lowest price for a flight from Porto to San Francisco was $380 for a one-way ticket and $592 for a round-trip.

  • Do I need a passport to fly between Porto and San Francisco?

    A passport is required to fly from Porto to San Francisco.

  • Which aircraft models fly most regularly from Porto to San Francisco?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Porto to San Francisco?

    Star Alliance is the only airline alliance operating flights between Porto and San Francisco.

  • How does KAYAK find such low prices on flights from Porto to San Francisco?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Porto to San Francisco.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Porto to San Francisco?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Porto is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Porto to San Francisco?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Francisco with an airline and back to Porto with another airline. Booking your flights between Porto and SFO can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Porto to San Francisco?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Francisco from Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Porto to San Francisco

 
See real verified KAYAK customer reviews for airlines flying from Porto to San Francisco. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Porto to San Francisco? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
6.8
LufthansaOverall score based on 7808 reviews
7.0Boarding
6.8Comfort
6.5Entertainment
6.3Food
7.6Crew
Airline reviews

Excellent service; they helped me reschedule so I can fly in an earlier flight

10.0 ExcellentAnonymous, Feb 2026
EWR - IND
Read more Lufthansa reviews

Excellent service; they helped me reschedule so I can fly in an earlier flight

Wonderful staff. The boarding process can be improved a little better by adequate prior communication but all in all they did fine. However the boarding gate was quite unfreindly to elderly and who needs help with sevral stairs.

Flight map did not work. Crew was great, food was good, plane took off on time and landed early. That's all I can ask.

I had a good comfortable seat. There was nearly an hour delay. There was an accident with the champagne, but I was well compensated. These things happen sometimes.

Very good. Comfortable and I felt well taken care of from start to finish

Bulkhead seats should not be an extra charge. They are extremely uncomfortable. And we missed our connecting flight due to slow luggage retreaval.

Not great - seats were very narrow and food was terrible.

Some of the crew was sassy and not super helpful. The food was okay, but it seems like they were all unprepared compared to my flight I did from JFK to Frankfurt

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

We were in premium economy seats that appeared to be locked in plae, No reclining. My aching back.

Everything you need to know for your flight from Porto to San Francisco

Information on your arrival and departure airports

Porto (OPO)
San Francisco (SFO)