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Cheap flights from London Heathrow Airport to Los Angeles from $415

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 Heathrow Airport to Los Angeles departing on 1/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from London Heathrow Airport to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Virgin Atlantic Logo
11:20 am - 5:13 pm
LHR
-
ONT
13h 53m1 stop
Virgin Atlantic Logo
6:00 am - 2:15 pm
ONT
-
LHR
24h 15m1 stop
$620Virgin Atlantic
Mon, Mar 30 - Wed, Apr 8
Virgin Atlantic Logo
2:30 pm - 10:33 pm
LHR
-
ONT
15h 03m1 stop
Virgin Atlantic Logo
6:00 am - 2:15 pm
ONT
-
LHR
24h 15m1 stop
$633Virgin Atlantic
Mon, Mar 9 - Mon, Mar 30
Virgin Atlantic Logo
10:45 am - 9:48 pm
LHR
-
ONT
18h 03m1 stop
Virgin Atlantic Logo
1:20 pm - 9:50 am
ONT
-
LHR
12h 30m1 stop
$634Virgin Atlantic
Sat, Mar 28 - Sat, Apr 11
Virgin Atlantic Logo
10:45 am - 4:15 pm
LHR
-
ONT
13h 30m1 stop
Virgin Atlantic Logo
1:10 pm - 10:00 am
ONT
-
LHR
12h 50m1 stop
$635Virgin Atlantic
Wed, Jan 21 - Wed, Jan 28
Virgin Atlantic Logo
11:20 am - 5:16 pm
LHR
-
ONT
13h 56m1 stop
Virgin Atlantic Logo
7:00 am - 9:00 am
ONT
-
LHR
18h 00m1 stop
$636Virgin Atlantic
Mon, Apr 27 - Wed, May 6
Virgin Atlantic Logo
10:45 am - 9:48 pm
LHR
-
ONT
19h 03m1 stop
Virgin Atlantic Logo
6:00 am - 10:00 am
ONT
-
LHR
20h 00m1 stop
$637Virgin Atlantic
Sat, Jan 10 - Wed, Jan 14
Virgin Atlantic Logo
10:45 am - 4:12 pm
LHR
-
ONT
13h 27m1 stop
Virgin Atlantic Logo
12:41 pm - 6:25 am
ONT
-
LHR
33h 44m1 stop
$638Virgin Atlantic
Tue, Jan 13 - Sat, Jan 17
Virgin Atlantic Logo
10:45 am - 10:38 pm
LHR
-
ONT
19h 53m1 stop
Virgin Atlantic Logo
6:00 am - 10:00 am
ONT
-
LHR
20h 00m1 stop
$642Virgin Atlantic
Sun, Jan 11 - Fri, Feb 20
Virgin Atlantic Logo
12:20 pm - 10:33 pm
LHR
-
ONT
17h 13m1 stop
Virgin Atlantic Logo
6:00 am - 10:00 am
ONT
-
LHR
21h 00m1 stop
$650Virgin Atlantic
Wed, Mar 11 - Sat, Mar 21
British Airways Logo
4:25 pm - 11:40 pm
LHR
-
ONT
15h 15m1 stop
British Airways Logo
11:01 am - 8:05 am
ONT
-
LHR
13h 04m1 stop
$652British Airways
Tue, Apr 14 - Tue, Apr 28

United Airlines flights from London Heathrow Airport to Ontario

Our best United Airlines deals on London Heathrow Airport to Ontario flight tickets
United Airlines
Jan 12
LHR1:45 pmLondon Heathrow
17h 08m
1 stop
ONT10:53 pmOntario
Feb 2
ONT1:53 pmOntario
14h 07m
1 stop
LHR12:00 pmLondon Heathrow
$499
Find similar
United Airlines
Jan 10
LHR10:00 amLondon Heathrow
19h 58m
1 stop
ONT9:58 pmOntario
Feb 4
ONT1:24 pmOntario
12h 16m
1 stop
LHR9:40 amLondon Heathrow
$613
Find similar
United Airlines
Jan 10
LHR12:05 pmLondon Heathrow
17h 53m
1 stop
ONT9:58 pmOntario
Feb 7
ONT1:53 pmOntario
14h 07m
1 stop
LHR12:00 pmLondon Heathrow
$643
Find similar

American Airlines flights from London Heathrow Airport to Ontario

Our best American Airlines deals on London Heathrow Airport to Ontario flight tickets
American Airlines
Jan 19
LHR10:05 amLondon Heathrow
15h 17m
1 stop
ONT5:22 pmOntario
Feb 2
ONT4:45 pmOntario
12h 30m
1 stop
LHR1:15 pmLondon Heathrow
$687
Find similar
American Airlines
Jan 12
LHR10:05 amLondon Heathrow
15h 17m
1 stop
ONT5:22 pmOntario
Jan 26
ONT4:45 pmOntario
12h 30m
1 stop
LHR1:15 pmLondon Heathrow
$713
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from London Heathrow Airport 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 December 8, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 3/30

11:20 am-5:13 pm

1 stop13h 53m

Ontario

Wed 4/8

6:00 am-2:15 pm

1 stop24h 15m

$620

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 3/9

2:30 pm-10:33 pm

1 stop15h 03m

Ontario

Mon 3/30

6:00 am-2:15 pm

1 stop24h 15m

$633

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 3/28

10:45 am-9:48 pm

1 stop18h 03m

Ontario

Sat 4/11

1:20 pm-9:50 am

1 stop12h 30m

$634

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/21

10:45 am-4:15 pm

1 stop13h 30m

Ontario

Wed 1/28

1:10 pm-10:00 am

1 stop12h 50m

$635

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 4/27

11:20 am-5:16 pm

1 stop13h 56m

Ontario

Wed 5/6

7:00 am-9:00 am

1 stop18h 00m

$636

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 1/10

10:45 am-9:48 pm

1 stop19h 03m

Ontario

Wed 1/14

6:00 am-10:00 am

1 stop20h 00m

$637

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 1/13

10:45 am-4:12 pm

1 stop13h 27m

Ontario

Sat 1/17

12:41 pm-6:25 am

1 stop33h 44m

$638

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/11

10:45 am-10:38 pm

1 stop19h 53m

Ontario

Fri 2/20

6:00 am-10:00 am

1 stop20h 00m

$642

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 3/11

12:20 pm-10:33 pm

1 stop17h 13m

Ontario

Sat 3/21

6:00 am-10:00 am

1 stop21h 00m

$650

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/14

4:25 pm-11:40 pm

1 stop15h 15m

Ontario

Tue 4/28

11:01 am-8:05 am

1 stop13h 04m

$652

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from London Heathrow Airport 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 cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from London Heathrow Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $572. If you aren’t able to travel during the month of September, then book flights to Ontario from London Heathrow Airport during June instead. Flights to Ontario in June, while not as cheap as those in September, still average around $612.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $602. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to Ontario for around $991.

What is the cheapest time of day to depart on your flight to Ontario?

In the afternoon is the cheapest time of day to fly from London Heathrow Airport to Ontario when you can find flight prices for as low as $602. Flying to Ontario in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $814 on average. Flights to Ontario from London Heathrow Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

You are more likely to see cheaper flights to Ontario from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $716 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from London Heathrow Airport for as low as $527 on momondo.

Can stopping save me money on London Heathrow Airport to Ontario flights?

You could potentially save up to 14% on your flight if you consider stops on a London Heathrow Airport to Ontario flight.

When to book flights from London Heathrow Airport to Ontario

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

Cheap London Heathrow Airport to Ontario (LHR to ONT) flight deals and tips

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

Fastest flight time

13h 19m

Direct flights

None
The fastest flight from London Heathrow Airport to Ontario takes 13h 19m
There are no direct flights from London Heathrow Airport to Ontario. There are no popular flight routes from London Heathrow Airport to Ontario.
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  • How far is London Heathrow to Ontario by plane?

    London Heathrow and Ontario are 5408.1 mi apart from one another. 13h 19m is a normal flight duration for this route.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Ontario Airport.

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

    The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from London Heathrow Airport to Ontario?

Best airlines flying from London Heathrow Airport to Ontario

Compare and see reviews for airlines that fly from London Heathrow Airport to Ontario with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,076 reviews
Search United Airlines flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from London to Ontario. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. All flights to Ontario from London on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential London to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to Ontario from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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