What is the cheapest airline that flies from London to Ontario?

United Airlines is the most popular carrier operating from London to Ontario

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

Prices for flights from London to Ontario Airport were last updated today.

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Ontario Airport.

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

The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

€367 Cheap Flights from London to Ontario in 2025/26

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Find the cheapest flights from London to Los Angeles

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

06:30 - 21:04

LHR

ONT

21h 34m2 stops

06:00 - 09:50

ONT

LHR

19h 50m1 stop

€564Delta

Sat, 28 Mar - Sat, 11 Apr

10:05 - 17:43

LHR

ONT

15h 38m1 stop

13:53 - 12:00

ONT

LHR

14h 07m1 stop

€571United Airlines

Mon, 12 Jan - Mon, 26 Jan

10:05 - 17:43

LHR

ONT

15h 38m1 stop

13:24 - 09:40

ONT

LHR

12h 16m1 stop

€572United Airlines

Wed, 21 Jan - Wed, 4 Feb

15:05 - 22:33

LHR

ONT

14h 28m1 stop

13:20 - 10:00

ONT

LHR

13h 40m1 stop

€578KLM

Sat, 14 Mar - Sat, 21 Mar

08:40 - 21:05

LHR

ONT

20h 25m2 stops

07:30 - 10:30

ONT

LHR

19h 00m1 stop

€579Delta

Thu, 22 Jan - Thu, 29 Jan

07:30 - 21:58

LHR

ONT

22h 28m2 stops

06:00 - 06:20

ONT

LHR

16h 20m2 stops

€580United Airlines

Thu, 22 Jan - Mon, 26 Jan

08:40 - 21:05

LHR

ONT

20h 25m2 stops

15:30 - 20:10

ONT

LHR

20h 40m2 stops

€582Delta

Sun, 18 Jan - Sat, 24 Jan

14:50 - 20:46

LHR

ONT

13h 56m1 stop

13:34 - 12:20

ONT

LHR

14h 46m1 stop

€585United Airlines

Mon, 13 Apr - Thu, 23 Apr

15:05 - 22:34

LHR

ONT

14h 29m1 stop

13:00 - 09:50

ONT

LHR

12h 50m1 stop

€586KLM

Sat, 21 Mar - Mon, 13 Apr

20:00 - 16:12

LHR

ONT

28h 12m2 stops

06:00 - 08:45

ONT

LHR

18h 45m2 stops

€591Virgin Atlantic

Mon, 12 Jan - Wed, 4 Feb

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

12 Jan

LHR08:20London Heathrow

17h 02m

1 stop

ONT17:22Ontario

22 Jan

ONT16:45Ontario

12h 30m

1 stop

LHR13:15London Heathrow

€571

Find similar

British Airways

22 Jan

LHR10:05London Heathrow

20h 43m

1 stop

ONT22:48Ontario

26 Jan

ONT06:00Ontario

16h 50m

1 stop

LHR06:50London Heathrow

€595

Find similar

British Airways

20 Apr

LHR16:25London Heathrow

15h 15m

1 stop

ONT23:40Ontario

3 May

ONT11:01Ontario

13h 04m

1 stop

LHR08:05London Heathrow

€598

Find similar

Virgin Atlantic flights from London to Ontario

Our best Virgin Atlantic deals on London to Ontario flight tickets

Virgin Atlantic

12 Jan

LHR20:00London Heathrow

28h 12m

2 stops

ONT16:12Ontario

4 Feb

ONT06:00Ontario

18h 45m

2 stops

LHR08:45London Heathrow

€591

Find similar

Virgin Atlantic

24 Dec

LHR10:45London Heathrow

19h 48m

1 stop

ONT22:33Ontario

11 Feb

ONT06:00Ontario

20h 00m

1 stop

LHR10:00London Heathrow

€594

Find similar

Virgin Atlantic

15 Dec

LHR11:40London Heathrow

19h 07m

2 stops

ONT22:47Ontario

11 Jan

ONT07:30Ontario

19h 10m

2 stops

LHR10:40London Heathrow

€604

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

06:30-21:04

2 stops21h 34m

Ontario

Sat 11/4

06:00-09:50

1 stop19h 50m

€564

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 12/1

10:05-17:43

1 stop15h 38m

Ontario

Mon 26/1

13:53-12:00

1 stop14h 07m

€571

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 21/1

10:05-17:43

1 stop15h 38m

Ontario

Wed 4/2

13:24-09:40

1 stop12h 16m

€572

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 14/3

15:05-22:33

1 stop14h 28m

Ontario

Sat 21/3

13:20-10:00

1 stop13h 40m

€578

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 22/1

08:40-21:05

2 stops20h 25m

Ontario

Thu 29/1

07:30-10:30

1 stop19h 00m

€579

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 22/1

07:30-21:58

2 stops22h 28m

Ontario

Mon 26/1

06:00-06:20

2 stops16h 20m

€580

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 18/1

08:40-21:05

2 stops20h 25m

Ontario

Sat 24/1

15:30-20:10

2 stops20h 40m

€582

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:46

1 stop13h 56m

Ontario

Thu 23/4

13:34-12:20

1 stop14h 46m

€585

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 21/3

15:05-22:34

1 stop14h 29m

Ontario

Mon 13/4

13:00-09:50

1 stop12h 50m

€586

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 12/1

20:00-16:12

2 stops28h 12m

Ontario

Wed 4/2

06:00-08:45

2 stops18h 45m

€591

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

What is the cheapest month to fly to Ontario?

If you don’t want to visit Ontario in January, then you should wait until September to fly from London, when ticket prices are also cheap, with an average price of €473.

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 €615 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 €452 on momondo.

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

Fastest flight time	15h 14m
Direct flights	None

The fastest flight from London to Ontario takes 15h 14m

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?
A flight from London to Ontario will travel around 8718.6 km. 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 were last updated today.
How old do you have to be to fly from London to Ontario Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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?

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 London.

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

If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario from London and alert you when they change.