$285 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 6/4. 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.
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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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Flights Deals

Best California Flight Deals from Porto

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Los Angeles
Los Angeles1 stop$541
San Francisco
San Francisco1 stop$665
Los Angeles
Los Angeles1 stop$541
San Francisco
San Francisco1 stop$665

Cheap Flights from Porto to California

 
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.

Recent round-trip flight deals from Porto to California

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Porto to California.
Discover the best prices for you by selecting your travel dates on KAYAK.
 Logo
6:05 pm - 5:30 pmOPO-LAX
31h 25m1 stop
 Logo
7:45 pm - 11:10 pmLAX-OPO
19h 25m1 stop
Sat, May 24 - Sun, Jun 8
 Logo
6:20 pm - 11:45 amOPO-SFO
25h 25m1 stop
 Logo
3:05 pm - 3:30 pmSFO-OPO
16h 25m1 stop
Sun, May 11 - Tue, May 27
Delta Logo
9:20 am - 6:15 pmOPO-SFO
16h 55m1 stop
Delta Logo
3:05 pm - 3:30 pmSFO-OPO
16h 25m1 stop
$671Delta
Find Deal
Sun, May 11 - Tue, May 27
Delta Logo
9:20 am - 6:15 pmOPO-SFO
16h 55m1 stop
Delta Logo
3:05 pm - 3:30 pmSFO-OPO
16h 25m1 stop
$672Delta
Find Deal
Sun, May 11 - Tue, May 27
Air Transat Logo
1:30 pm - 9:58 pmOPO-LAS
16h 28m1 stop
Air Transat Logo
4:45 pm - 11:55 amLAS-OPO
35h 10m1 stop
$695Air Transat
Find Deal
Mon, May 12 - Tue, May 27
Air Transat Logo
1:30 pm - 9:58 pmOPO-LAS
16h 28m1 stop
Air Transat Logo
10:55 pm - 11:45 amLAS-OPO
28h 50m1 stop
$701Air Transat
Find Deal
Thu, Jul 3 - Sat, Jul 12
Lufthansa Logo
6:15 am - 7:00 pmOPO-SFO
20h 45m1 stop
Lufthansa Logo
9:05 pm - 11:20 pmSFO-OPO
18h 15m1 stop
$753Lufthansa
Find Deal
Mon, Sep 8 - Fri, Sep 19
KLM Logo
6:05 am - 2:50 pmOPO-LAX
16h 45m1 stop
KLM Logo
3:25 pm - 3:30 pmLAX-OPO
16h 05m1 stop
$774KLM
Find Deal
Sat, Sep 6 - Sat, Sep 27
Lufthansa Logo
6:15 am - 7:00 pmOPO-SFO
20h 45m1 stop
Lufthansa Logo
9:05 pm - 11:20 pmSFO-OPO
18h 15m1 stop
$788Lufthansa
Find Deal
Sun, Sep 7 - Fri, Sep 19
KLM Logo
6:15 am - 4:03 pmOPO-LAS
17h 48m2 stops
KLM Logo
8:25 pm - 7:35 pmLAS-OPO
15h 10m1 stop
$919KLM
Find Deal
Wed, Jun 4 - Wed, Jun 18
Useful Info

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 $658 (return) on average. On the other hand, the most expensive months are July and August, when the average cost of round-trip tickets is $1,150 and $1,149 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 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 20 weeks before departure.


Good to know

Low seasonFebruary
High seasonAugust
Cheapest flight$285
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly with an average 23% 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.

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.
7.8
KLMOverall score based on 1334 reviews
7.8Boarding
7.7Comfort
7.2Food
7.1Entertainment
8.4Crew
Airline reviews

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

8.0 ExcellentShereen, Apr 2025AMS - YUL
Read more KLM reviews

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

This portion of the flight was through Indigo. A local carrier. So all economy seating. No real service some refreshments for purchase standard economy stuff.

Transfer at Amsterdam airport is very convenient and the airport is easy to navigate. Boarding was also quick and easy. Cabin crew were excellent and the meals were good, although lacking in options.

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

I flew premium economy and this was a good option. Although the seats didn’t recline much, I was able to get some sleep with my head propped against the window. The food was good and the entertainment was wonderful The staff were very attentive and professional

They only had vegetarian food left on the flight which I wasn’t happy about. I didn’t get any food to eat at all.

The plane was very clean. The bathroom was clean as well. The land crew were very polite and informative and helpful. They informed me that there is a long way and challenging to go from international terminal to national terminal and in addition to getting my suitcases and going through customs and dropping them again for my second leg of trip which was San Francisco to Los Angeles . I have left knee issue and had a recent fall with aching muscles all over, the land crew suggested wheelchair help for me, God bless her. If I did not have help, I could not make it to my last terminal. Thank you UNITED AIRLINE!

I like the service and the efficiency. I am lactose intolerant and the lactose intolerant meal in business class was not astounding. Also, the business class fully reclining seats are not that comfortable.

Food was great but they didn't clear my meal tray for 3 hours. You'd think they could check though the cabin now and then.

Upon arriving at IAH, it was informed that the luggage had not arrived. Still waiting to hear back when it will be delivered.

I wasn’t allowed to board with my children. I was charged outrageous costs for basic carry on size luggage. The entertainment screens were outdated and not user friendly.

I was very happy with everything, thank you for the smooth flight ✈️

helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.

I enjoyed my flight back with Lufthansa because the food was good, and the flight attendants were nice and helped you when you asked a question. The flight attendants always came around and asked if you needed anything which I liked a lot.

Entertainment system is old. Food can be tastier Need to provide toothbrush and toothpaste at least when asked.

The flight was cancelled due to tech problem with the plane

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

Information on your arrival and departure airports

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