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

United Airlines and British Airways 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.

€393 Cheap Flights from London to Ontario in 2026

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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.

10:15 - 18:42

LHR

ONT

15h 27m

1 stop

14:39 - 12:10

ONT

LHR

13h 31m

1 stop

€452British Airways

Tue, 17 Mar - Mon, 30 Mar

06:30 - 23:44

LHR

ONT

25h 14m

2 stops

13:29 - 13:15

ONT

LHR

15h 46m

2 stops

€453Delta

Mon, 20 Apr - Tue, 28 Apr

10:05 - 16:22

LHR

ONT

14h 17m

1 stop

10:56 - 08:05

ONT

LHR

13h 09m

1 stop

€454British Airways

Mon, 30 Mar - Mon, 6 Apr

10:05 - 16:22

LHR

ONT

14h 17m

1 stop

10:59 - 07:55

ONT

LHR

12h 56m

1 stop

€455British Airways

Mon, 30 Mar - Wed, 8 Apr

10:15 - 18:42

LHR

ONT

15h 27m

1 stop

10:56 - 06:50

ONT

LHR

12h 54m

1 stop

€456British Airways

Tue, 10 Mar - Tue, 17 Mar

10:15 - 18:42

LHR

ONT

15h 27m

1 stop

10:56 - 08:05

ONT

LHR

13h 09m

1 stop

€457British Airways

Wed, 11 Mar - Tue, 31 Mar

14:25 - 22:30

LHR

ONT

16h 05m

1 stop

10:59 - 08:05

ONT

LHR

13h 06m

1 stop

€467British Airways

Wed, 1 Apr - Tue, 14 Apr

16:25 - 23:59

LHR

ONT

15h 34m

1 stop

10:59 - 08:05

ONT

LHR

13h 06m

1 stop

€468British Airways

Wed, 1 Apr - Thu, 16 Apr

10:55 - 23:51

LHR

ONT

20h 56m

1 stop

17:53 - 15:35

ONT

LHR

13h 42m

1 stop

€470Delta

Tue, 31 Mar - Sun, 12 Apr

17:45 - 17:16

LHR

ONT

31h 31m

1 stop

09:55 - 13:05

ONT

LHR

19h 10m

2 stops

€471Delta

Thu, 16 Jul - Mon, 17 Aug

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

2 Jul

LHR13:40London Heathrow

16h 15m

1 stop

ONT21:55Ontario

16 Jul

ONT06:30Ontario

16h 05m

2 stops

LHR06:35London Heathrow

€477

United Airlines

8 Apr

LHR14:50London Heathrow

13h 46m

1 stop

ONT20:36Ontario

15 Apr

ONT11:05Ontario

17h 15m

2 stops

LHR12:20London Heathrow

€478

United Airlines

15 Apr

LHR10:50London Heathrow

19h 55m

2 stops

ONT22:45Ontario

29 Apr

ONT05:10Ontario

18h 05m

2 stops

LHR07:15London Heathrow

€558

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

20 Apr

LHR06:30London Heathrow

25h 14m

2 stops

ONT23:44Ontario

28 Apr

ONT13:29Ontario

15h 46m

2 stops

LHR13:15London Heathrow

€453

Delta

31 Mar

LHR10:55London Heathrow

20h 56m

1 stop

ONT23:51Ontario

12 Apr

ONT17:53Ontario

13h 42m

1 stop

LHR15:35London Heathrow

€470

Delta

16 Jul

LHR17:45London Heathrow

27h 04m

1 stop

ONT12:49Ontario

17 Aug

ONT14:00Ontario

14h 10m

1 stop

LHR12:10London Heathrow

€471

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 17/3

10:15-18:42

1 stop15h 27m

Ontario

Mon 30/3

14:39-12:10

1 stop13h 31m

€452

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 20/4

06:30-23:44

2 stops25h 14m

Ontario

Tue 28/4

13:29-13:15

2 stops15h 46m

€453

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 30/3

10:05-16:22

1 stop14h 17m

Ontario

Mon 6/4

10:56-08:05

1 stop13h 09m

€454

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 30/3

10:05-16:22

1 stop14h 17m

Ontario

Wed 8/4

10:59-07:55

1 stop12h 56m

€455

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/3

10:15-18:42

1 stop15h 27m

Ontario

Tue 17/3

10:56-06:50

1 stop12h 54m

€456

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 11/3

10:15-18:42

1 stop15h 27m

Ontario

Tue 31/3

10:56-08:05

1 stop13h 09m

€457

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

14:25-22:30

1 stop16h 05m

Ontario

Tue 14/4

10:59-08:05

1 stop13h 06m

€467

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

16:25-23:59

1 stop15h 34m

Ontario

Thu 16/4

10:59-08:05

1 stop13h 06m

€468

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 31/3

10:55-23:51

1 stop20h 56m

Ontario

Sun 12/4

17:53-15:35

1 stop13h 42m

€470

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 16/7

17:45-17:16

1 stop31h 31m

Ontario

Mon 17/8

09:55-13:05

2 stops19h 10m

€471

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 September, then you should wait until February to fly from London, when ticket prices are also cheap, with an average price of €474.

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 €569 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 29m
Direct flights	None

The fastest flight from London to Ontario takes 15h 29m

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 29m 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.