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Cheap flights from London to Los Angeles from $436

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Los Angeles departing on 4/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from London to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
7:25 am - 5:47 pm
LHR
-
ONT
18h 22m
2 stops
United Airlines Logo
6:49 pm - 11:10 am
ONT
-
LHR
32h 21m
1 stop
$601United Airlines
Wed, Apr 15 - Wed, Apr 22
United Airlines Logo
10:50 am - 10:59 pm
LHR
-
ONT
20h 09m
2 stops
United Airlines Logo
6:00 am - 2:10 pm
ONT
-
LHR
24h 10m
1 stop
$603United Airlines
Fri, May 8 - Tue, May 12
United Airlines Logo
6:55 am - 5:47 pm
LHR
-
ONT
18h 52m
2 stops
United Airlines Logo
11:05 am - 11:10 am
ONT
-
LHR
16h 05m
1 stop
$604United Airlines
Wed, Apr 15 - Wed, Apr 29
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$618British Airways
Tue, Apr 14 - Tue, Apr 21
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$620British Airways
Tue, Apr 14 - Fri, Apr 24
American Airlines Logo
2:00 pm - 11:34 am
LGW
-
ONT
29h 34m
2 stops
American Airlines Logo
11:59 pm - 6:50 am
ONT
-
LGW
22h 51m
2 stops
$650American Airlines
Mon, May 4 - Sat, May 9
American Airlines Logo
12:20 pm - 10:05 am
LGW
-
ONT
29h 45m
2 stops
American Airlines Logo
11:59 pm - 6:50 am
ONT
-
LGW
22h 51m
2 stops
$652American Airlines
Sat, Apr 25 - Sat, May 9
Multiple Airlines Logo
12:20 pm - 11:46 pm
LGW
-
ONT
19h 26m
2 stops
Multiple Airlines Logo
2:08 pm - 8:40 am
ONT
-
LGW
34h 32m
2 stops
$683Multiple Airlines
Sun, May 10 - Sat, May 16
Iberia Logo
11:30 am - 11:46 pm
LGW
-
ONT
20h 16m
2 stops
Iberia Logo
2:08 pm - 8:00 pm
ONT
-
LGW
21h 52m
2 stops
$830Iberia
Thu, Apr 16 - Thu, Apr 23
Iberia Logo
9:50 am - 11:46 pm
LCY
-
ONT
21h 56m
2 stops
Iberia Logo
10:59 am - 3:15 pm
ONT
-
LCY
20h 16m
2 stops
$857Iberia
Mon, Apr 20 - Mon, May 4

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets
British Airways
Apr 14
LHR10:05 amLondon Heathrow
14h 17m
1 stop
ONT4:22 pmOntario
Apr 21
ONT10:59 amOntario
13h 06m
1 stop
LHR8:05 amLondon Heathrow
$618
British Airways
Apr 14
LHR10:05 amLondon Heathrow
14h 17m
1 stop
ONT4:22 pmOntario
Apr 24
ONT10:59 amOntario
13h 06m
1 stop
LHR8:05 amLondon Heathrow
$620
British Airways
Apr 6
LHR10:05 amLondon Heathrow
14h 17m
1 stop
ONT4:22 pmOntario
Apr 28
ONT10:59 amOntario
13h 06m
1 stop
LHR8:05 amLondon Heathrow
$631

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets
Delta
Mar 31
LHR11:40 amLondon Heathrow
18h 54m
1 stop
ONT10:34 pmOntario
Apr 9
ONT10:25 pmOntario
28h 55m
2 stops
LHR11:20 amLondon Heathrow
$683
Delta
Mar 31
LHR11:40 amLondon Heathrow
18h 54m
1 stop
ONT10:34 pmOntario
Apr 8
ONT5:53 pmOntario
13h 42m
1 stop
LHR3:35 pmLondon Heathrow
$686
Delta
Apr 1
LHR3:15 pmLondon Heathrow
28h 32m
1 stop
ONT11:47 amOntario
Apr 10
ONT10:25 pmOntario
28h 55m
2 stops
LHR11:20 amLondon Heathrow
$735

momondo Fare Finder

 
Customize your flight search to find flights from London to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 18, 2026.
Use the filters below to find and compare flights from London to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/15

7:25 am-5:47 pm

2 stops18h 22m

Ontario

Wed 4/22

6:49 pm-11:10 am

1 stop32h 21m

$601

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 5/8

10:50 am-10:59 pm

2 stops20h 09m

Ontario

Tue 5/12

6:00 am-2:10 pm

1 stop24h 10m

$603

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/15

6:55 am-5:47 pm

2 stops18h 52m

Ontario

Wed 4/29

11:05 am-11:10 am

1 stop16h 05m

$604
Quickest round-trip

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/14

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Tue 4/21

10:59 am-8:05 am

1 stop13h 06m

$618

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/14

10:05 am-4:22 pm

1 stop14h 17m

Ontario

Fri 4/24

10:59 am-8:05 am

1 stop13h 06m

$620

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Mon 5/4

2:00 pm-11:34 am

2 stops29h 34m

Ontario

Sat 5/9

11:59 pm-6:50 am

2 stops22h 51m

$650

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sat 4/25

12:20 pm-10:05 am

2 stops29h 45m

Ontario

Sat 5/9

11:59 pm-6:50 am

2 stops22h 51m

$652

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sun 5/10

12:20 pm-11:46 pm

2 stops19h 26m

Ontario

Sat 5/16

2:08 pm-8:40 am

2 stops34h 32m

$683

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 4/16

11:30 am-11:46 pm

2 stops20h 16m

Ontario

Thu 4/23

2:08 pm-8:00 pm

2 stops21h 52m

$830

LondonOntario

LCY - ONT

LCYONT

London City

Mon 4/20

9:50 am-11:46 pm

2 stops21h 56m

Ontario

Mon 5/4

10:59 am-3:15 pm

2 stops20h 16m

$857

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Los Angeles from

How to get the cheapest flight ticket from London to Ontario

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 typical price of a round-trip flight between London and Ontario?

What is the cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from London to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $545. If you aren’t able to travel during the month of September, then book flights to Ontario from London during February instead. Flights to Ontario in February, while not as cheap as those in September, still average around $558.

How far in advance should I book a flight to Ontario?

You are more likely to see cheaper flights to Ontario from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $678 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from London for as low as $496 on momondo.

Can stopping save me money on London to Ontario flights?

You could potentially save up to 18% on your flight if you consider stops on a London to Ontario flight.

When to book flights from London to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from London to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap London to Ontario (LON to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Ontario

Fastest flight time

13h 46m

Direct flights

None
The fastest flight from London to Ontario takes 13h 46m
There are no direct flights from London to Ontario. There are no popular flight routes from London to Ontario.
Search flight deals

  • How far is London to Ontario by plane?

    The distance between London and Ontario is about 5417.5 mi. Typically, this will take 13h 46m by plane in normal conditions.

  • When did momondo last update prices for flights from London to Ontario Airport?

    Prices for flights from London to Ontario Airport are updated daily.

  • How many operators does momondo search for flights from London to Ontario Airport?

  • How old do you have to be to fly from London to Ontario Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from London to Ontario

Compare and see reviews for airlines that fly from London to Ontario with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $497Free CancellationRating
7.4
9,439 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Ontario?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from London.

Can I find flights from London to Ontario with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for London to Ontario flights to just show those with flexible booking policies.

How can momondo help me find flights from London to Ontario?

momondo provides multiple filters to help you find the best flight to Ontario from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to Ontario right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Ontario 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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