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

British Airways and United Airlines are the most popular carriers 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.

€355 Cheap Flights from London to Ontario in 2025/26

Q: What is the typical price of a round-trip flight between London and Ontario?

Prices are currently low for flights on this route. Typical prices usually range from €514 to €607. The lowest price recently found on this route was €434.

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Find the cheapest flights from London to Los Angeles

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Enter your travel dates to find the best prices.

08:55 - 21:05

LHR

ONT

20h 10m1 stop

12:41 - 11:40

ONT

LHR

14h 59m1 stop

€434Delta

Mon, 12 Jan - Mon, 26 Jan

14:30 - 22:44

LHR

ONT

16h 14m1 stop

12:41 - 11:40

ONT

LHR

14h 59m1 stop

€435Virgin Atlantic

Tue, 3 Feb - Tue, 10 Feb

07:30 - 21:58

LHR

ONT

22h 28m2 stops

06:00 - 07:25

ONT

LHR

17h 25m1 stop

€437United Airlines

Thu, 22 Jan - Mon, 26 Jan

07:30 - 21:58

LHR

ONT

22h 28m2 stops

06:00 - 07:55

ONT

LHR

17h 55m2 stops

€439United Airlines

Thu, 22 Jan - Mon, 26 Jan

14:30 - 22:44

LHR

ONT

16h 14m1 stop

13:00 - 09:50

ONT

LHR

12h 50m1 stop

€441KLM

Mon, 2 Feb - Tue, 28 Jul

07:30 - 21:58

LHR

ONT

22h 28m2 stops

06:00 - 07:55

ONT

LHR

17h 55m2 stops

€442United Airlines

Thu, 22 Jan - Mon, 26 Jan

06:30 - 20:58

LHR

ONT

22h 28m2 stops

07:30 - 14:00

ONT

LHR

22h 30m1 stop

€447Delta

Mon, 13 Apr - Thu, 23 Apr

07:25 - 17:47

LHR

ONT

18h 22m2 stops

05:10 - 06:45

ONT

LHR

17h 35m2 stops

€450United Airlines

Wed, 15 Apr - Thu, 23 Apr

13:05 - 20:58

LHR

ONT

15h 53m1 stop

11:53 - 14:00

ONT

LHR

18h 07m1 stop

€450Delta

Mon, 13 Apr - Thu, 23 Apr

15:00 - 22:48

LHR

ONT

15h 48m1 stop

16:45 - 13:15

ONT

LHR

12h 30m1 stop

€452British Airways

Tue, 3 Feb - Tue, 10 Feb

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

12 Jan

LHR08:55London Heathrow

20h 10m

1 stop

ONT21:05Ontario

26 Jan

ONT12:41Ontario

14h 59m

1 stop

LHR11:40London Heathrow

€434

Find similar

Delta

13 Apr

LHR06:30London Heathrow

22h 28m

2 stops

ONT20:58Ontario

23 Apr

ONT07:30Ontario

22h 30m

1 stop

LHR14:00London Heathrow

€447

Find similar

Delta

13 Apr

LHR13:05London Heathrow

15h 53m

1 stop

ONT20:58Ontario

23 Apr

ONT11:53Ontario

18h 07m

1 stop

LHR14:00London Heathrow

€450

Find similar

Virgin Atlantic flights from London to Ontario

Our best Virgin Atlantic deals on London to Ontario flight tickets

Virgin Atlantic

3 Feb

LHR14:30London Heathrow

16h 14m

1 stop

ONT22:44Ontario

10 Feb

ONT12:41Ontario

14h 59m

1 stop

LHR11:40London Heathrow

€435

Find similar

Virgin Atlantic

27 Dec

LHR10:45London Heathrow

19h 43m

1 stop

ONT22:28Ontario

10 Jan

ONT06:00Ontario

17h 05m

2 stops

LHR07:05London Heathrow

€565

Find similar

Virgin Atlantic

27 Dec

LHR12:20London Heathrow

18h 08m

2 stops

ONT22:28Ontario

10 Jan

ONT06:00Ontario

17h 05m

2 stops

LHR07:05London Heathrow

€837

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 12/1

08:55-21:05

1 stop20h 10m

Ontario

Mon 26/1

12:41-11:40

1 stop14h 59m

€434

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/2

14:30-22:44

1 stop16h 14m

Ontario

Tue 10/2

12:41-11:40

1 stop14h 59m

€435

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 22/1

07:30-21:58

2 stops22h 28m

Ontario

Mon 26/1

06:00-07:25

1 stop17h 25m

€437

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 22/1

07:30-21:58

2 stops22h 28m

Ontario

Mon 26/1

06:00-07:55

2 stops17h 55m

€439

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 2/2

14:30-22:44

1 stop16h 14m

Ontario

Tue 28/7

13:00-09:50

1 stop12h 50m

€441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 22/1

07:30-21:58

2 stops22h 28m

Ontario

Mon 26/1

06:00-07:55

2 stops17h 55m

€442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

06:30-20:58

2 stops22h 28m

Ontario

Thu 23/4

07:30-14:00

1 stop22h 30m

€447

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/4

07:25-17:47

2 stops18h 22m

Ontario

Thu 23/4

05:10-06:45

2 stops17h 35m

€450

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

13:05-20:58

1 stop15h 53m

Ontario

Thu 23/4

11:53-14:00

1 stop18h 07m

€450

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/2

15:00-22:48

1 stop15h 48m

Ontario

Tue 10/2

16:45-13:15

1 stop12h 30m

€452

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

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 €467.

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 €611 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 €447 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 17m
Direct flights	None

The fastest flight from London to Ontario takes 15h 17m

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 15h 17m 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.