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Cheap flights from the United Kingdom to Los Angeles from $338

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United Kingdom to Los Angeles departing on 11/20. 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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Find the cheapest flights from the United Kingdom to Los Angeles

Recent round-trip flight deals from the United Kingdom to Los Angeles

Enter your travel dates to find the best prices.
Delta Logo
11:45 am - 11:59 amLHR-ONT
32h 14m2 stops
Delta Logo
7:30 am - 12:50 pmONT-LHR
21h 20m1 stop
$522Delta
Find Deal
Thu, Feb 26 - Mon, Mar 2
Delta Logo
8:55 am - 9:07 pmLHR-ONT
20h 12m1 stop
Delta Logo
1:09 pm - 11:40 amONT-LHR
14h 31m1 stop
$540Delta
Find Deal
Wed, Feb 18 - Sat, Feb 28
KLM Logo
10:55 am - 4:19 pmLHR-ONT
13h 24m1 stop
KLM Logo
1:00 pm - 9:50 amONT-LHR
12h 50m1 stop
$556KLM
Find Deal
Thu, Apr 2 - Mon, Apr 6
KLM Logo
11:20 am - 5:16 pmLHR-ONT
13h 56m1 stop
KLM Logo
1:00 pm - 9:50 amONT-LHR
12h 50m1 stop
$565KLM
Find Deal
Wed, Apr 15 - Sat, Apr 25
Virgin Atlantic Logo
10:45 am - 11:53 pmLHR-ONT
21h 08m1 stop
Virgin Atlantic Logo
1:10 pm - 10:00 amONT-LHR
12h 50m1 stop
$580Virgin Atlantic
Find Deal
Thu, Feb 26 - Mon, Mar 2
Air France Logo
10:45 am - 4:13 pmLHR-ONT
13h 28m1 stop
Air France Logo
1:04 pm - 9:00 amONT-LHR
35h 56m1 stop
$588Air France
Find Deal
Thu, Jan 8 - Sun, Jan 11
Virgin Atlantic Logo
10:45 am - 11:58 pmLHR-ONT
21h 13m1 stop
Virgin Atlantic Logo
6:00 am - 10:00 amONT-LHR
20h 00m1 stop
$604Virgin Atlantic
Find Deal
Wed, Dec 3 - Fri, Dec 12
United Airlines Logo
10:05 am - 5:37 pmLHR-ONT
15h 32m1 stop
United Airlines Logo
1:50 pm - 12:00 pmONT-LHR
14h 10m1 stop
$650United Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9
United Airlines Logo
1:45 pm - 10:49 pmLHR-ONT
17h 04m1 stop
United Airlines Logo
1:34 pm - 9:40 amONT-LHR
12h 06m1 stop
$651United Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Air France Logo
11:05 am - 11:04 pmNCL-ONT
19h 59m2 stops
Air France Logo
12:16 pm - 4:10 pmONT-NCL
19h 54m2 stops
$1,314Air France
Find Deal
Wed, Nov 19 - Sat, Nov 29

Delta flights from United Kingdom to Ontario

Our best Delta deals on United Kingdom to Ontario flight tickets
Delta
Feb 26
LHR11:45 amLondon Heathrow
32h 14m
2 stops
ONT11:59 amOntario
Mar 2
ONT7:30 amOntario
21h 20m
1 stop
LHR12:50 pmLondon Heathrow
$522
Find similar
Delta
Feb 18
LHR8:55 amLondon Heathrow
20h 12m
1 stop
ONT9:07 pmOntario
Feb 28
ONT1:09 pmOntario
14h 31m
1 stop
LHR11:40 amLondon Heathrow
$540
Find similar
Delta
Feb 26
LHR6:30 amLondon Heathrow
22h 37m
2 stops
ONT9:07 pmOntario
Mar 2
ONT7:30 amOntario
19h 00m
1 stop
LHR10:30 amLondon Heathrow
$561
Find similar

British Airways flights from United Kingdom to Ontario

Our best British Airways deals on United Kingdom to Ontario flight tickets
British Airways
Jan 20
LHR6:00 amLondon Heathrow
20h 45m
2 stops
ONT6:45 pmOntario
Jan 30
ONT3:09 pmOntario
13h 06m
1 stop
LHR12:15 pmLondon Heathrow
$645
Find similar
British Airways
Feb 10
LHR3:00 pmLondon Heathrow
15h 48m
1 stop
ONT10:48 pmOntario
Mar 3
ONT3:19 pmOntario
12h 56m
1 stop
LHR12:15 pmLondon Heathrow
$653
Find similar
British Airways
Feb 10
LHR3:00 pmLondon Heathrow
15h 48m
1 stop
ONT10:48 pmOntario
Feb 17
ONT4:59 pmOntario
12h 16m
1 stop
LHR1:15 pmLondon Heathrow
$656
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from United Kingdom 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 November 4, 2025.
Use the filters below to find and compare flights from the United Kingdom to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

11:45 am-11:59 am

2 stops32h 14m

Ontario

Mon 3/2

7:30 am-12:50 pm

1 stop21h 20m

$522

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 2/18

8:55 am-9:07 pm

1 stop20h 12m

Ontario

Sat 2/28

1:09 pm-11:40 am

1 stop14h 31m

$540

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 4/2

10:55 am-4:19 pm

1 stop13h 24m

Ontario

Mon 4/6

1:00 pm-9:50 am

1 stop12h 50m

$556

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/15

11:20 am-5:16 pm

1 stop13h 56m

Ontario

Sat 4/25

1:00 pm-9:50 am

1 stop12h 50m

$565

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

10:45 am-11:53 pm

1 stop21h 08m

Ontario

Mon 3/2

1:10 pm-10:00 am

1 stop12h 50m

$580

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 1/8

10:45 am-4:13 pm

1 stop13h 28m

Ontario

Sun 1/11

1:04 pm-9:00 am

1 stop35h 56m

$588

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 12/3

10:45 am-11:58 pm

1 stop21h 13m

Ontario

Fri 12/12

6:00 am-10:00 am

1 stop20h 00m

$604

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 12/2

10:05 am-5:37 pm

1 stop15h 32m

Ontario

Tue 12/9

1:50 pm-12:00 pm

1 stop14h 10m

$650

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 12/3

1:45 pm-10:49 pm

1 stop17h 04m

Ontario

Wed 12/10

1:34 pm-9:40 am

1 stop12h 06m

$651

Newcastle upon TyneOntario

NCL - ONT

NCLONT

Newcastle upon Tyne

Wed 11/19

11:05 am-11:04 pm

2 stops19h 59m

Ontario

Sat 11/29

12:16 pm-4:10 pm

2 stops19h 54m

$1,314

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 United Kingdom 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 United Kingdom to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $552. If you aren’t able to travel during the month of September, then book flights to Ontario from United Kingdom during January instead. Flights to Ontario in January, while not as cheap as those in September, still average around $557.

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 United Kingdom 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 United Kingdom 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 United Kingdom 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 United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $719 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from United Kingdom for as low as $543 on momondo.

Can stopping save me money on United Kingdom to Ontario flights?

You could potentially save up to 60% on your flight if you consider stops on a United Kingdom to Ontario flight.

Cheap United Kingdom to Ontario flight deals and tips

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

Direct flights

None
There are no direct flights from United Kingdom to Ontario. There are no popular flight routes from United Kingdom to Ontario.
Search flight deals

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

    Prices for flights from United Kingdom to Ontario Airport refresh daily.

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

  • How old do you have to be to fly from United Kingdom 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 United Kingdom to Ontario Airport.

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

    The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from United Kingdom to Ontario

Compare and see reviews for airlines that fly from United Kingdom to Ontario with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,002 reviews
Search United Airlines flights

Why use momondo?

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

It is quick and easy to find United Kingdom to Ontario flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ontario that suits you.

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

momondo does allow users to show only those flights to Ontario from United Kingdom which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from United Kingdom to Ontario?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ontario from United Kingdom.

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

Of course. momondo tracks the price of United Kingdom 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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