Find cheap KLM flights to California from £350

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Flight Deals

Cheap KLM Flight Deals to California

 
Here are some of the best deals found on KAYAK recently from KLM 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 return KLM flight deals from the United Kingdom to California

Mon, 16 Mar - Sat, 4 Apr
KLM Logo
14:45 - 22:38LHR-ONT
14h 53m1 stop
KLM Logo
13:00 - 09:50ONT-LHR
12h 50m1 stop
£412KLM
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Sat, 7 Feb - Sat, 28 Mar
KLM Logo
15:05 - 22:29LHR-ONT
15h 24m1 stop
KLM Logo
13:00 - 08:50ONT-LHR
12h 50m1 stop
£414KLM
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Mon, 30 Mar - Mon, 6 Apr
KLM Logo
11:20 - 17:15LHR-ONT
13h 55m1 stop
KLM Logo
13:00 - 09:50ONT-LHR
12h 50m1 stop
£422KLM
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Thu, 16 Apr - Tue, 28 Apr
KLM Logo
11:20 - 17:16LHR-ONT
13h 56m1 stop
KLM Logo
13:00 - 09:50ONT-LHR
12h 50m1 stop
£426KLM
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Sat, 13 Dec - Sat, 28 Mar
KLM Logo
15:05 - 22:47LHR-ONT
15h 42m1 stop
KLM Logo
13:00 - 08:50ONT-LHR
12h 50m1 stop
£464KLM
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Mon, 16 Mar - Sat, 4 Apr
KLM Logo
06:30 - 12:45LHR-LAX
13h 15m1 stop
KLM Logo
16:50 - 13:50LAX-LHR
13h 00m1 stop
£473KLM
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Fri, 12 Dec - Thu, 8 Jan
KLM Logo
06:30 - 11:50LHR-SFO
13h 20m1 stop
KLM Logo
09:00 - 08:05SFO-LHR
15h 05m1 stop
£475KLM
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Thu, 25 Dec - Sun, 11 Jan
KLM Logo
06:30 - 11:50LHR-SFO
13h 20m1 stop
KLM Logo
10:35 - 10:30SFO-LHR
15h 55m1 stop
£478KLM
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Wed, 10 Dec - Tue, 16 Dec
KLM Logo
06:30 - 11:50LHR-SFO
13h 20m1 stop
KLM Logo
14:00 - 11:40SFO-LHR
13h 40m1 stop
£479KLM
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Thu, 11 Dec - Mon, 15 Dec
KLM Logo
06:30 - 11:50LHR-SFO
13h 20m1 stop
KLM Logo
11:40 - 08:45SFO-LHR
13h 05m1 stop
£480KLM
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Good to know

Low seasonNovember
Cheapest flight£350
Average price round-trip£614
Best time to beat the crowds (6% less expensive on average)
Most popular time to fly and prices are also 18% lower on average.
Flight from London Heathrow Airport to Ontario
(price for this month)

KAYAK's insights & trends for flights to California

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

What is the cheapest day to fly to California?

The average price of all flights from the United Kingdom to California clicked on KAYAK for each day over the last 12 months.

Based on KAYAK data, the cheapest day to fly to California is Wednesday when return tickets can be as cheap as £559. On the other hand, the most expensive day to fly is Sunday, when return prices are £638 on average.

What is the cheapest month to fly from the United Kingdom to California?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from the United Kingdom 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 the United Kingdom to California is September, when tickets cost £396 (return) on average. On the other hand, the most expensive months are July and December, when the average cost of round-trip tickets is £660 and £608 respectively.

How far in advance should I book a flight from the United Kingdom to California?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights 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 a flight from the United Kingdom to California, you should book around 2 weeks before departure, which saves you about 28% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

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KLM customer reviews

7.7
Good1,411 verified ratings
7.8Boarding
8.4Crew
7.1Entertainment
7.7Comfort
7.3Food
Pros +
  • The crew were great! (in 147 reviews)
Cons -
  • I felt harassed by the man and was very uncomfortable the whole flight. (in 116 reviews)
  • When I boarded a man sat it my seat. (in 47 reviews)
Show reviews that mention
Traveller rating:
Sort by:
E
2.0 Poor
At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.
N
8.0 Very Good
Flight was delayed. Why? Everything was ready on time.
A
2.0 Poor
Poor and left me hungry
A
2.0 Poor
Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed
M
4.0 Mediocre
They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.
S
6.0 Okay
Couldn’t get boarding pass in SLC even with help from a redcoat, so had to find a desk in AMS to get boarding pass. Technical problems so not sure why. Very inconvenient. The KLM app is not as user friendly as most apps. Also had to wait almost an hour on the tarmac for a fuel truck, which caused us to miss a connecting bus in LUX.
B
10.0 Wonderful
no food , poor snacks and wifi was limited
P
2.0 Poor
Flight left without me.
P
2.0 Poor
Delays, missed connection, lost a day!
C
10.0 Wonderful
The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.
Read more about KLM

Everything you need to know for your flight to California