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

British Airways 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.

€359 Cheap Flights from London to Ontario in 2026

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 €424 to €485. The lowest price recently found on this route was €399.

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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.

11:30 - 22:53

LHR

ONT

19h 23m2 stops

13:50 - 12:00

ONT

LHR

14h 10m1 stop

€399United Airlines

Fri, 6 Feb - Fri, 13 Feb

09:30 - 21:50

LHR

ONT

20h 20m2 stops

18:54 - 12:20

ONT

LHR

33h 26m2 stops

€412United Airlines

Mon, 27 Apr - Sat, 9 May

09:30 - 21:50

LHR

ONT

20h 20m2 stops

05:05 - 09:40

ONT

LHR

20h 35m1 stop

€413United Airlines

Mon, 27 Apr - Sat, 9 May

07:30 - 21:58

LHR

ONT

22h 28m2 stops

06:00 - 06:20

ONT

LHR

16h 20m2 stops

€415United Airlines

Thu, 22 Jan - Mon, 26 Jan

10:05 - 17:41

LHR

ONT

15h 36m1 stop

13:53 - 12:00

ONT

LHR

14h 07m1 stop

€425United Airlines

Sat, 21 Feb - Sat, 28 Feb

10:05 - 17:43

LHR

ONT

15h 38m1 stop

13:53 - 12:00

ONT

LHR

14h 07m1 stop

€426United Airlines

Tue, 27 Jan - Tue, 3 Feb

06:30 - 22:51

LHR

ONT

24h 21m2 stops

22:20 - 06:25

ONT

LHR

24h 05m1 stop

€428Delta

Fri, 30 Jan - Sun, 15 Feb

06:30 - 22:37

LHR

ONT

24h 07m2 stops

06:00 - 12:10

ONT

LHR

22h 10m1 stop

€429Delta

Sat, 7 Mar - Mon, 6 Apr

13:45 - 22:57

LHR

ONT

16h 12m1 stop

13:27 - 11:10

ONT

LHR

13h 43m1 stop

€432United Airlines

Wed, 25 Mar - Tue, 31 Mar

12:05 - 21:59

LHR

ONT

17h 54m1 stop

13:43 - 12:20

ONT

LHR

14h 37m1 stop

€433United Airlines

Sat, 14 Feb - Fri, 17 Apr

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

19 Feb

LHR16:30London Heathrow

15h 29m

1 stop

ONT23:59Ontario

23 Feb

ONT17:02Ontario

12h 13m

1 stop

LHR13:15London Heathrow

€461

British Airways

7 Mar

LHR08:20London Heathrow

15h 59m

1 stop

ONT16:19Ontario

6 Apr

ONT10:56Ontario

13h 09m

1 stop

LHR08:05London Heathrow

€467

British Airways

3 Apr

LHR16:10London Heathrow

13h 57m

1 stop

ONT22:07Ontario

21 Apr

ONT10:59Ontario

13h 06m

1 stop

LHR08:05London Heathrow

€481

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

6 Feb

LHR11:30London Heathrow

19h 23m

2 stops

ONT22:53Ontario

13 Feb

ONT13:50Ontario

14h 10m

1 stop

LHR12:00London Heathrow

€399

United Airlines

27 Apr

LHR09:30London Heathrow

20h 20m

2 stops

ONT21:50Ontario

9 May

ONT18:54Ontario

33h 26m

2 stops

LHR12:20London Heathrow

€412

United Airlines

27 Apr

LHR09:30London Heathrow

20h 20m

2 stops

ONT21:50Ontario

9 May

ONT05:05Ontario

20h 35m

1 stop

LHR09:40London Heathrow

€413

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 6/2

11:30-22:53

2 stops19h 23m

Ontario

Fri 13/2

13:50-12:00

1 stop14h 10m

€399

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

18:54-12:20

2 stops33h 26m

€412

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

05:05-09:40

1 stop20h 35m

€413

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

€415

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 21/2

10:05-17:41

1 stop15h 36m

Ontario

Sat 28/2

13:53-12:00

1 stop14h 07m

€425

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 27/1

10:05-17:43

1 stop15h 38m

Ontario

Tue 3/2

13:53-12:00

1 stop14h 07m

€426

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 30/1

06:30-22:51

2 stops24h 21m

Ontario

Sun 15/2

22:20-06:25

1 stop24h 05m

€428

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/3

06:30-22:37

2 stops24h 07m

Ontario

Mon 6/4

06:00-12:10

1 stop22h 10m

€429

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

13:45-22:57

1 stop16h 12m

Ontario

Tue 31/3

13:27-11:10

1 stop13h 43m

€432

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 14/2

12:05-21:59

1 stop17h 54m

Ontario

Fri 17/4

13:43-12:20

1 stop14h 37m

€433

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 €470.

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 €585 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 €453 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	18h 13m
Direct flights	None

The fastest flight from London to Ontario takes 18h 13m

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 18h 13m 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.