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Cheap flights from London to Los Angeles from $487

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 9/28. 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
0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from London to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Virgin Atlantic Logo
10:55 am - 10:44 pm
LHR
-
ONT
19h 49m
1 stop
Virgin Atlantic Logo
1:00 pm - 10:00 am
ONT
-
LHR
13h 00m
1 stop
$625Virgin Atlantic
Sat, Sep 5 - Sat, Sep 19
American Airlines Logo
12:20 pm - 10:34 pm
LGW
-
ONT
42h 14m
2 stops
American Airlines Logo
5:34 am - 10:40 am
ONT
-
LGW
21h 06m
2 stops
$628American Airlines
Wed, Jul 22 - Tue, Aug 4
Virgin Atlantic Logo
11:40 am - 10:34 pm
LHR
-
ONT
18h 54m
1 stop
Virgin Atlantic Logo
7:05 am - 6:25 am
ONT
-
LHR
15h 20m
1 stop
$635Virgin Atlantic
Sat, May 30 - Sat, Jun 6
British Airways Logo
2:25 pm - 9:08 pm
LHR
-
ONT
14h 43m
1 stop
British Airways Logo
1:31 pm - 10:30 am
ONT
-
LHR
12h 59m
1 stop
$641British Airways
Wed, Sep 9 - Tue, Sep 29
Multiple Airlines Logo
10:55 am - 4:17 pm
LHR
-
ONT
13h 22m
1 stop
Multiple Airlines Logo
1:29 pm - 11:00 am
ONT
-
LHR
13h 31m
1 stop
$642Multiple Airlines
Tue, May 26 - Tue, Jun 2
Delta Logo
8:40 am - 10:34 pm
LHR
-
ONT
21h 54m
2 stops
Delta Logo
11:52 am - 12:10 pm
ONT
-
LHR
16h 18m
1 stop
$652Delta
Tue, May 26 - Tue, Jun 2
Multiple Airlines Logo
10:55 am - 4:17 pm
LHR
-
ONT
13h 22m
1 stop
Multiple Airlines Logo
1:29 pm - 11:00 am
ONT
-
LHR
13h 31m
1 stop
$655Multiple Airlines
Thu, May 28 - Tue, Jun 2
Iberia Logo
11:30 am - 6:57 pm
LGW
-
ONT
39h 27m
2 stops
Iberia Logo
10:25 am - 8:00 pm
ONT
-
LGW
25h 35m
2 stops
$707Iberia
Tue, Sep 8 - Tue, Sep 22
Iberia Logo
11:30 am - 6:47 pm
LGW
-
ONT
39h 17m
2 stops
Iberia Logo
2:22 pm - 8:00 pm
ONT
-
LGW
21h 38m
2 stops
$725Iberia
Sun, Aug 30 - Thu, Sep 24
Delta Logo
10:25 am - 10:34 pm
LGW
-
ONT
20h 09m
2 stops
Delta Logo
1:35 pm - 4:00 pm
ONT
-
LGW
18h 25m
2 stops
$807Delta
Mon, May 18 - Sun, May 24

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Virgin Atlantic flights from London to Ontario

Our best Virgin Atlantic deals on London to Ontario flight tickets
Virgin Atlantic
Sep 5
LHR10:55 amLondon Heathrow
19h 49m
1 stop
ONT10:44 pmOntario
Sep 19
ONT1:00 pmOntario
13h 00m
1 stop
LHR10:00 amLondon Heathrow
$625
Virgin Atlantic
May 30
LHR11:40 amLondon Heathrow
18h 54m
1 stop
ONT10:34 pmOntario
Jun 6
ONT7:05 amOntario
15h 20m
1 stop
LHR6:25 amLondon Heathrow
$635
Virgin Atlantic
May 30
LHR10:55 amLondon Heathrow
19h 50m
1 stop
ONT10:45 pmOntario
Jun 4
ONT1:35 pmOntario
18h 00m
1 stop
LHR3:35 pmLondon Heathrow
$640

American Airlines flights from London to Ontario

Our best American Airlines deals on London to Ontario flight tickets
American Airlines
Jul 22
LGW12:20 pmLondon Gatwick
42h 14m
2 stops
ONT10:34 pmOntario
Aug 4
ONT5:34 amOntario
21h 06m
2 stops
LGW10:40 amLondon Gatwick
$628
American Airlines
Aug 3
LHR4:10 pmLondon Heathrow
13h 34m
1 stop
ONT9:44 pmOntario
Aug 12
ONT10:29 amOntario
14h 31m
1 stop
LHR9:00 amLondon Heathrow
$662
American Airlines
Aug 17
LHR11:00 amLondon Heathrow
15h 15m
1 stop
ONT6:15 pmOntario
Sep 7
ONT2:27 pmOntario
15h 58m
1 stop
LHR2:25 pmLondon Heathrow
$667

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 April 30, 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

Sat 9/5

10:55 am-10:44 pm

1 stop19h 49m

Ontario

Sat 9/19

1:00 pm-10:00 am

1 stop13h 00m

$625

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Wed 7/22

12:20 pm-10:34 pm

2 stops42h 14m

Ontario

Tue 8/4

5:34 am-10:40 am

2 stops21h 06m

$628

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 5/30

11:40 am-10:34 pm

1 stop18h 54m

Ontario

Sat 6/6

7:05 am-6:25 am

1 stop15h 20m

$635

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/9

2:25 pm-9:08 pm

1 stop14h 43m

Ontario

Tue 9/29

1:31 pm-10:30 am

1 stop12h 59m

$641
Quickest round-trip

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 5/26

10:55 am-4:17 pm

1 stop13h 22m

Ontario

Tue 6/2

1:29 pm-11:00 am

1 stop13h 31m

$642

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 5/26

8:40 am-10:34 pm

2 stops21h 54m

Ontario

Tue 6/2

11:52 am-12:10 pm

1 stop16h 18m

$652

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 5/28

10:55 am-4:17 pm

1 stop13h 22m

Ontario

Tue 6/2

1:29 pm-11:00 am

1 stop13h 31m

$655

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Tue 9/8

11:30 am-6:57 pm

2 stops39h 27m

Ontario

Tue 9/22

10:25 am-8:00 pm

2 stops25h 35m

$707

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sun 8/30

11:30 am-6:47 pm

2 stops39h 17m

Ontario

Thu 9/24

2:22 pm-8:00 pm

2 stops21h 38m

$725

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Mon 5/18

10:25 am-10:34 pm

2 stops20h 09m

Ontario

Sun 5/24

1:35 pm-4:00 pm

2 stops18h 25m

$807

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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, December 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 $375. If you aren’t able to travel during the month of December, then book flights to Ontario from London during March instead. Flights to Ontario in March, while not as cheap as those in December, still average around $398.

How far in advance should I book a flight from London 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 $675 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 25% 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 19m

Direct flights

None
The fastest flight from London to Ontario takes 13h 19m
There are no direct flights from London to Ontario. There are no popular flight routes from London to Ontario.
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Frequently asked questions about flying from London to Ontario

  • How far is London to Ontario by plane?

    The distance between London and Ontario is about 5417.5 mi. Typically, this will take 13h 19m 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
British AirwaysPriceFrom $567Free CancellationRating
6.7
7,937 reviews
Search British Airways 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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