$332 Find Cheap Flights from Porto to California

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 California departing on 10/6. 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

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to California, 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 California, as well as popular online travel agencies
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Cheap Flights from Porto to California

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Los Angeles
Los Angeles1 stop$538
San Francisco
San Francisco1 stop$512
Sacramento
Sacramento1 stop$983
Los Angeles
Los Angeles1 stop$538
San Francisco
San Francisco1 stop$512
Sacramento
Sacramento1 stop$983

Book Cheap Porto to California Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto to California 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 California

vie., nov. 21 - jue., nov. 27
Scandinavian Airlines Logo
5:45 pm - 2:35 pmOPO-SFO
28h 50m1 stop
Scandinavian Airlines Logo
4:40 pm - 4:55 pmSFO-OPO
16h 15m1 stop
$512Scandinavian Airlines
Find Deal
vie., nov. 7 - lun., nov. 10
 Logo
2:45 pm - 8:25 pmOPO-LAX
37h 40m1 stop
 Logo
2:30 pm - 2:10 pmLAX-OPO
39h 40m1 stop
jue., sep. 11 - mié., sep. 24
TAP AIR PORTUGAL Logo
7:00 am - 2:30 pmOPO-SFO
15h 30m1 stop
TAP AIR PORTUGAL Logo
4:20 pm - 3:00 pmSFO-OPO
14h 40m1 stop
$596TAP AIR PORTUGAL
Find Deal
jue., sep. 11 - mié., sep. 24
TAP AIR PORTUGAL Logo
7:00 am - 2:30 pmOPO-SFO
15h 30m1 stop
TAP AIR PORTUGAL Logo
4:20 pm - 3:00 pmSFO-OPO
14h 40m1 stop
$602TAP AIR PORTUGAL
Find Deal
mié., oct. 1 - mié., oct. 8
SWISS Logo
12:20 pm - 4:10 pmOPO-SFO
35h 50m1 stop
SWISS Logo
7:30 pm - 7:55 amSFO-OPO
28h 25m1 stop
$678SWISS
Find Deal
vie., nov. 21 - mié., nov. 26
United Airlines Logo
12:30 pm - 8:10 pmOPO-SFO
15h 40m1 stop
United Airlines Logo
10:45 am - 9:30 amSFO-OPO
14h 45m1 stop
$683United Airlines
Find Deal
mar., nov. 18 - mié., nov. 26
United Airlines Logo
6:00 am - 9:23 pmOPO-SFO
23h 23m2 stops
United Airlines Logo
11:45 am - 9:30 amSFO-OPO
13h 45m1 stop
$689United Airlines
Find Deal
lun., nov. 17 - jue., nov. 27
SWISS Logo
12:05 pm - 4:30 pmOPO-SFO
36h 25m1 stop
SWISS Logo
7:25 pm - 11:10 amSFO-OPO
31h 45m1 stop
$695SWISS
Find Deal
vie., oct. 31 - vie., nov. 14
Lufthansa Logo
6:15 am - 4:15 pmOPO-LAX
17h 00m1 stop
Lufthansa Logo
5:30 pm - 11:40 pmLAX-OPO
22h 10m1 stop
$816Lufthansa
Find Deal
vie., oct. 31 - dom., nov. 16
Lufthansa Logo
6:15 am - 4:15 pmOPO-LAX
17h 00m1 stop
Lufthansa Logo
8:00 am - 9:30 amLAX-OPO
17h 30m1 stop
$827Lufthansa
Find Deal
Booking Insights

KAYAK's insights & trends for Porto to California flights

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

What is the cheapest month to fly from Porto to California?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Porto to California, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Porto to California is February, when tickets cost $631 (return) on average. On the other hand, the most expensive months are December and July, when the average cost of round-trip tickets is $987 and $925 respectively.

What’s the cheapest day of the week to fly from Porto to California?

The average price of all round-trip flights from Porto to California clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to California on a Tuesday and more expensive on a Friday. On your return trip to Porto, you should consider flying back on a Wednesday, and avoid Fridays for better deals.

How far in advance should I book a flight from Porto to California?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Porto to California, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Porto to California, you should book around 2 weeks before departure, which saves you about 17% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$332
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly with an average 4% increase in price.
Flight from Porto to Los Angeles

FAQs - booking California flights

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

    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 California.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Porto to California 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 California?

    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 from Porto to California with an airline and back with another airline.

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

    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 from Porto to California up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to California?

    The cheapest time of day to fly to California is generally in the evening, when round-trip flights cost $802 on average. Morning departures are around 7% more expensive than evening flights, on average. The most expensive time of day to fly to California is generally in the morning, which is peak travel time and where the average cost of a ticket is $857.

Reviews of the top airlines flying from Porto to California

 
See real verified KAYAK customer reviews for airlines flying from Porto to California. 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 California? 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.
7.4
United AirlinesOverall score based on 8919 reviews
8.1Crew
7.3Comfort
7.7Boarding
7.1Entertainment
6.6Food
Airline reviews

The flight was comfortable with the exit row and great service

10.0 ExcellentMark, Aug 2025HNL - LAX
Read more United Airlines reviews

The flight was comfortable with the exit row and great service

Plane was crowded and even when we hit altitude, the plane was hot, not enough air flow.

1. when we went to check in, our 2 first class seats had been CANCELED and the flight was sold out. This was done without our prior knowledge. It was all we could do to restore one first class seat for my wife and I flew economy. 2, Our flight home was scheduled to leave at 10:30 pm. Due to tsunami warnings, the roads were closed and our flight status was uncertain as to whether it would leave as scheduled. It was announced that it would now leave at 11:20 pm and the roads were now open since the tsunami had come and gone. We made a mad dash to the airport and checked in. Delays were announced at 12:30 pm, 1:30 am, 2:30 am and at 3:30 am it was canceled. Since this was a flight due to natural (tsunami) causes, there was no compensation. We were told to return at 1:00 pm the next day and our baggage would be kept on the plane since the same plane was going to leave at 1:00 pm. We had to return to our hotel for the rest of the night. The same plane did not leave at 1:00 pm and our baggage was gone! All in all, it was a miserable performance by UA. Information was hard to obtain and no one knew what was going on and what was going to happen. Hundreds of passengers slept on the floor, chairs, etc. No food and no water was made available to the passengers. It was a situation where UA could care less what was going on. As a one million mile flyer, I had not experienced anything like this before and it was hugely disappointing!

I found the staff to not be very attentive at all. When paying for Business Class you expect a certain type of service and that was not found. They were almost rude even

Ok. Get a different kosher caterer. The food was odd.

Our experience on United Airlines was extremely poor. The plane was extremely cold throughout our entire flight- which multiple people complained about- and we had to wait 2 hours to get a blanket which was too thin and barely helped warm us up. As well as this, none of the entertainment features were working so we had to sit through a roughly 10 hour flight with nothing to keep our attention, including the actual flight path screen. It was an extremely disappointing experience and I would hope that this gets fixed if we ever choose United Airlines again.

I really enjoyed flying with United airlines amazing experience , good customer service and great food

1.It will be better if sandwich is warm. 2.The food is too salty. 3.Breakfast needs some vegetables or fruits.

Boarded plane and then delayed 1.5 hours while on the plane

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

They don’t give information on why a flight is delayed in a timely manner. Very frustrating.

The flight was ok but chargers did not work and the speakers in the back of the cabin did not either. But I am writing because the crew was really, really rude and not only rude but had the curtains always closed, forgot to clear our trays, the bathrooms were filthy and trash was building out, and one of the attendants even had her EARBUDS on while in the cabin. From movement it seemed like she was listening to music, so not even the safety aspect was there. My neighbor s English is not good and they were very dismissive of her. when we deplaned the crew in the back was just chatting with one another and the first class attendant was briefly and said goodnight. It is nice that a crew gets along so well, but they did not take care of passengers at all. They rushed through all the services and otherwise did not go through the cabin to offer water or anything else. i had the feeling of being unwelcome at a party. I am not a grumpy traveller but I thought you really needed to know. Thank you, Carin

Food was terrible. They ran out of options and gave me a bland undercooked pasta and veggies. Only middle seat was available to select although I paid extra. Baggage delayed at destination. Flight attendants not really helpful.

Flight was late arriving. So, we left 25 min late. Pilot made some time up during the flight. Therefore, we arrived alittle past original time.

Crew was great. But my flight was late arriving and as a result, I missed my connecting flight to Richmond. I had to catch a later flight. On a positive note, the attendants at the counter were extremely helpful in booking my later flight. They book my on the next flight to Richmond.

If the plain wait for the passenger it should wait for the baggage!!

The plane (Mitsubishi CRJ) felt old, creaking and not very new. The crew was okay. Hot water provision was broken so hot beverages could't be served.

One one boarding scanner was working to scan 400+ passengers to an Airbus 380. Food in premium economy was mediocre.

Liked the flight being almost on time (airport issues created a delay). Disliked the issue printing tag bags on the kiosk and having to wait for an hour on like to drop my bags.

Our flight was delayed for over an hour due to weather, and it had already been a long travel day. However, the crew was calm and compassionate, listening to every complaint with genuine concern. They got us home safely without incident, in spite of all of the obstacles. I’m grateful.

Everything you need to know for your flight from Porto to California

Information on your arrival and departure airports

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