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Cheap flights from London to Los Angeles from £298

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 15/10. 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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Cheap return flights

American Airlines Logo
12:30 - 20:24LGW-ONT
39h 54m2 stops
American Airlines Logo
06:47 - 09:00ONT-LGW
18h 13m2 stops
£361American Airlines
Find Deal
Thu, 26 Feb - Mon, 2 Mar
American Airlines Logo
12:30 - 09:31LGW-ONT
29h 01m2 stops
American Airlines Logo
20:04 - 07:30ONT-LGW
27h 26m2 stops
£361American Airlines
Find Deal
Thu, 26 Feb - Mon, 2 Mar
Virgin Atlantic Logo
20:25 - 22:41LHR-ONT
33h 16m2 stops
Virgin Atlantic Logo
07:05 - 09:00ONT-LHR
17h 55m1 stop
£363Virgin Atlantic
Find Deal
Wed, 29 Oct - Wed, 5 Nov
Virgin Atlantic Logo
20:00 - 21:20LHR-ONT
32h 20m2 stops
Virgin Atlantic Logo
11:36 - 09:00ONT-LHR
13h 24m1 stop
£375Virgin Atlantic
Find Deal
Tue, 28 Oct - Tue, 4 Nov
British Airways Logo
15:00 - 22:02LHR-ONT
15h 02m1 stop
British Airways Logo
17:03 - 13:15ONT-LHR
12h 12m1 stop
£376British Airways
Find Deal
Sat, 24 Jan - Tue, 3 Feb
Virgin Atlantic Logo
14:45 - 22:41LHR-ONT
14h 56m1 stop
Virgin Atlantic Logo
07:35 - 12:50ONT-LHR
21h 15m1 stop
£377Virgin Atlantic
Find Deal
Thu, 30 Oct - Thu, 6 Nov
British Airways Logo
15:00 - 22:02LHR-ONT
15h 02m1 stop
British Airways Logo
17:03 - 13:15ONT-LHR
12h 12m1 stop
£378British Airways
Find Deal
Sat, 7 Feb - Sat, 21 Feb
Delta Logo
06:30 - 19:19LHR-ONT
19h 49m2 stops
Delta Logo
06:00 - 08:45ONT-LHR
18h 45m2 stops
£396Delta
Find Deal
Thu, 30 Oct - Thu, 6 Nov
Delta Logo
06:30 - 17:09LHR-ONT
18h 39m2 stops
Delta Logo
06:00 - 10:30ONT-LHR
20h 30m2 stops
£407Delta
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Sat, 22 Nov - Sat, 29 Nov
Finnair Logo
11:45 - 19:41LHR-ONT
15h 56m1 stop
Finnair Logo
10:47 - 08:35ONT-LHR
13h 48m1 stop
£411Finnair
Find Deal
Mon, 10 Nov - Mon, 17 Nov

American Airlines flights from London to Ontario

Our best American Airlines deals on London to Ontario flight tickets
American Airlines
26 Feb
LGW12:30London Gatwick
39h 54m
2 stops
ONT20:24Ontario
2 Mar
ONT06:47Ontario
18h 13m
2 stops
LGW09:00London Gatwick
£361
Find similar
American Airlines
26 Feb
LGW12:30London Gatwick
29h 01m
2 stops
ONT09:31Ontario
2 Mar
ONT20:04Ontario
27h 26m
2 stops
LGW07:30London Gatwick
£361
Find similar
American Airlines
1 Oct
LGW12:20London Gatwick
40h 51m
2 stops
ONT21:11Ontario
5 Oct
ONT23:59Ontario
24h 11m
2 stops
LGW08:10London Gatwick
£379
Find similar

Iberia flights from London to Ontario

Our best Iberia deals on London to Ontario flight tickets
Iberia
22 Sept
LHR08:20London Heathrow
22h 13m
1 stop
ONT22:33Ontario
8 Oct
ONT10:57Ontario
19h 28m
1 stop
LHR14:25London Heathrow
£510
Find similar
Iberia
10 Mar
LGW11:45London Gatwick
41h 17m
2 stops
ONT22:02Ontario
24 Mar
ONT06:46Ontario
21h 04m
2 stops
LGW10:50London Gatwick
£534
Find similar
Iberia
10 Mar
LGW19:40London Gatwick
33h 22m
2 stops
ONT22:02Ontario
22 Mar
ONT06:00Ontario
21h 50m
2 stops
LGW10:50London Gatwick
£542
Find similar

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 16 September 2025.
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

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 26/2

12:30-20:24

2 stops39h 54m

Ontario

Mon 2/3

06:47-09:00

2 stops18h 13m

£361

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 26/2

12:30-09:31

2 stops29h 01m

Ontario

Mon 2/3

20:04-07:30

2 stops27h 26m

£361

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 29/10

20:25-22:41

2 stops33h 16m

Ontario

Wed 5/11

07:05-09:00

1 stop17h 55m

£363

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 28/10

20:00-21:20

2 stops32h 20m

Ontario

Tue 4/11

11:36-09:00

1 stop13h 24m

£375

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 24/1

15:00-22:02

1 stop15h 02m

Ontario

Tue 3/2

17:03-13:15

1 stop12h 12m

£376

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 30/10

14:45-22:41

1 stop14h 56m

Ontario

Thu 6/11

07:35-12:50

1 stop21h 15m

£377

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/2

15:00-22:02

1 stop15h 02m

Ontario

Sat 21/2

17:03-13:15

1 stop12h 12m

£378

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 30/10

06:30-19:19

2 stops19h 49m

Ontario

Thu 6/11

06:00-08:45

2 stops18h 45m

£396

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 22/11

06:30-17:09

2 stops18h 39m

Ontario

Sat 29/11

06:00-10:30

2 stops20h 30m

£407

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 10/11

11:45-19:41

1 stop15h 56m

Ontario

Mon 17/11

10:47-08:35

1 stop13h 48m

£411

Flights are sorted by cheapest return 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?

The month of February is, on average, the cheapest month to fly to Ontario from London, with most prices found around £402. If you’re not able to fly to Ontario in February, then January is your next best option. Flight prices from London to Ontario during January average around £410.

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 Wednesday when prices can be found for as low as £484. This is often the case because there is less demand to fly during this day of the week. Flights from London to Ontario on a Sunday will generally be more expensive and average around £559. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Flying to Ontario from London in the evening is the least expensive time of day to depart. momondo users have found prices as low as £473 when looking at flights departing in the evening. In contrast, the most expensive time of day to depart to Ontario is at midday when prices are around £556.

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 £528 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from London for as low as £429 on momondo.

Can stopping save me money on London to Ontario flights?

You could potentially save up to 2% 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 return 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

Direct flights

None
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?

    There are 5417.5 mi between London and Ontario. Flights usually cover this in 13h 34m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from London to Ontario Airport are refreshed on a daily basis.

  • 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.

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

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
FinnairPriceFrom £276Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
British AirwaysPriceFrom £381Free CancellationRating
6.6
7,361 reviews
Search British Airways flights
United AirlinesPriceFrom £381Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
KLMPriceFrom £390Free CancellationRating
7.8
1,385 reviews
Search KLM flights
Virgin AtlanticPriceFrom £404Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
LufthansaPriceFrom £426Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights

Why use momondo?

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

Finding the right flight to Ontario from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to Ontario from London with this policy.

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?

If you are not ready to book a flight from London to Ontario now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ontario and let you know when they change.

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