Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from London Heathrow Airport to Los Angeles from $517

This is the cheapest round-trip 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 10/6. 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.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from London Heathrow Airport to Los Angeles (LHR-ONT)

Cheap round-trip flights

Virgin Atlantic Logo
7:15 pm - 10:41 pmLHR-ONT
35h 26m2 stops
Virgin Atlantic Logo
1:15 pm - 1:10 pmONT-LHR
15h 55m2 stops
$517Virgin Atlantic
Find Deal
Mon, Oct 6 - Mon, Oct 13
British Airways Logo
2:55 pm - 10:02 pmLHR-ONT
15h 07m1 stop
British Airways Logo
5:03 pm - 1:15 pmONT-LHR
12h 12m1 stop
$526British Airways
Find Deal
Tue, Feb 10 - Tue, Feb 24
British Airways Logo
3:10 pm - 10:18 pmLHR-ONT
15h 08m1 stop
British Airways Logo
2:51 pm - 12:45 pmONT-LHR
13h 54m1 stop
$529British Airways
Find Deal
Mon, Oct 6 - Mon, Oct 13
American Airlines Logo
12:00 pm - 6:54 pmLHR-ONT
14h 54m1 stop
American Airlines Logo
2:54 pm - 12:45 pmONT-LHR
13h 51m1 stop
$551American Airlines
Find Deal
Wed, Sep 24 - Mon, Sep 29
KLM Logo
12:30 pm - 11:04 pmLHR-ONT
18h 34m1 stop
KLM Logo
11:29 am - 10:30 amONT-LHR
15h 01m1 stop
$553KLM
Find Deal
Mon, Nov 17 - Thu, Dec 4
American Airlines Logo
12:00 pm - 6:54 pmLHR-ONT
14h 54m1 stop
American Airlines Logo
12:47 pm - 10:50 amONT-LHR
14h 03m1 stop
$554American Airlines
Find Deal
Mon, Sep 15 - Tue, Sep 23
Delta Logo
8:40 am - 10:41 pmLHR-ONT
22h 01m2 stops
Delta Logo
11:48 am - 11:20 amONT-LHR
15h 32m1 stop
$570Delta
Find Deal
Thu, Oct 9 - Thu, Oct 16
Iberia Logo
12:00 pm - 6:54 pmLHR-ONT
14h 54m1 stop
Iberia Logo
10:57 am - 9:00 amONT-LHR
14h 03m1 stop
$574Iberia
Find Deal
Tue, Sep 23 - Tue, Oct 14
Iberia Logo
2:55 pm - 10:42 pmLHR-ONT
14h 47m1 stop
Iberia Logo
12:53 pm - 10:00 amONT-LHR
13h 07m1 stop
$582Iberia
Find Deal
Wed, Oct 29 - Thu, Nov 6
Delta Logo
6:30 am - 5:10 pmLHR-ONT
18h 40m2 stops
Delta Logo
7:05 am - 7:40 amONT-LHR
16h 35m2 stops
$590Delta
Find Deal
Thu, Oct 9 - Thu, Oct 16

Virgin Atlantic flights from London Heathrow Airport to Ontario

Our best Virgin Atlantic deals on London Heathrow Airport to Ontario flight tickets
Virgin Atlantic
Oct 6
LHR7:15 pmLondon Heathrow
35h 26m
2 stops
ONT10:41 pmOntario
Oct 13
ONT1:15 pmOntario
15h 55m
2 stops
LHR1:10 pmLondon Heathrow
$517
Find similar
Virgin Atlantic
Sep 2
LHR5:10 pmLondon Heathrow
37h 30m
2 stops
ONT10:40 pmOntario
Sep 23
ONT9:55 amOntario
19h 15m
2 stops
LHR1:10 pmLondon Heathrow
$519
Find similar
Virgin Atlantic
Oct 9
LHR10:55 amLondon Heathrow
20h 44m
2 stops
ONT11:39 pmOntario
Oct 16
ONT7:35 amOntario
19h 45m
1 stop
LHR11:20 amLondon Heathrow
$549
Find similar

British Airways flights from London Heathrow Airport to Ontario

Our best British Airways deals on London Heathrow Airport to Ontario flight tickets
British Airways
Feb 10
LHR2:55 pmLondon Heathrow
15h 07m
1 stop
ONT10:02 pmOntario
Feb 24
ONT5:03 pmOntario
12h 12m
1 stop
LHR1:15 pmLondon Heathrow
$526
Find similar
British Airways
Oct 6
LHR3:10 pmLondon Heathrow
15h 08m
1 stop
ONT10:18 pmOntario
Oct 13
ONT2:51 pmOntario
13h 54m
1 stop
LHR12:45 pmLondon Heathrow
$529
Find similar
British Airways
Sep 2
LHR8:20 amLondon Heathrow
18h 04m
1 stop
ONT6:24 pmOntario
Sep 23
ONT12:47 pmOntario
14h 03m
1 stop
LHR10:50 amLondon Heathrow
$531
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 August 26, 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 10/6

7:15 pm-10:41 pm

2 stops35h 26m

Ontario

Mon 10/13

1:15 pm-1:10 pm

2 stops15h 55m

$517

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 2/10

2:55 pm-10:02 pm

1 stop15h 07m

Ontario

Tue 2/24

5:03 pm-1:15 pm

1 stop12h 12m

$526

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 10/6

3:10 pm-10:18 pm

1 stop15h 08m

Ontario

Mon 10/13

2:51 pm-12:45 pm

1 stop13h 54m

$529

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/24

12:00 pm-6:54 pm

1 stop14h 54m

Ontario

Mon 9/29

2:54 pm-12:45 pm

1 stop13h 51m

$551

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 11/17

12:30 pm-11:04 pm

1 stop18h 34m

Ontario

Thu 12/4

11:29 am-10:30 am

1 stop15h 01m

$553

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 9/15

12:00 pm-6:54 pm

1 stop14h 54m

Ontario

Tue 9/23

12:47 pm-10:50 am

1 stop14h 03m

$554

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/9

8:40 am-10:41 pm

2 stops22h 01m

Ontario

Thu 10/16

11:48 am-11:20 am

1 stop15h 32m

$570

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 9/23

12:00 pm-6:54 pm

1 stop14h 54m

Ontario

Tue 10/14

10:57 am-9:00 am

1 stop14h 03m

$574

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/29

2:55 pm-10:42 pm

1 stop14h 47m

Ontario

Thu 11/6

12:53 pm-10:00 am

1 stop13h 07m

$582

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/9

6:30 am-5:10 pm

2 stops18h 40m

Ontario

Thu 10/16

7:05 am-7:40 am

2 stops16h 35m

$590

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Los Angeles from

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

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 $576. If you aren’t able to travel during the month of September, then book flights to Ontario from London Heathrow Airport during February instead. Flights to Ontario in February, while not as cheap as those in September, still average around $589.

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 $709 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 $575 on momondo.

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

Direct flights

None
There are no direct flights from London Heathrow Airport to Ontario. There are no popular flight routes from London Heathrow Airport to Ontario.
Search flight deals

  • How far is London Heathrow to Ontario by plane?

    London Heathrow and Ontario are 5408.1 mi apart from one another. 14h 08m 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
8,943 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.

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sun 8/31
Sun 9/7
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States