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.

€370 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 €444 to €580. The lowest price recently found on this route was €420.

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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.

09:30 - 22:57

LHR

ONT

20h 27m

2 stops

18:37 - 20:35

ONT

LHR

18h 58m

2 stops

€420United Airlines

Mon, 16 Mar - Mon, 23 Mar

09:30 - 20:50

LHR

ONT

19h 20m

2 stops

13:40 - 12:00

ONT

LHR

14h 20m

1 stop

€428United Airlines

Thu, 26 Feb - Thu, 5 Mar

07:30 - 21:50

LHR

ONT

22h 20m

2 stops

13:30 - 11:10

ONT

LHR

13h 40m

1 stop

€431United Airlines

Mon, 27 Apr - Sat, 9 May

09:30 - 21:50

LHR

ONT

20h 20m

2 stops

06:00 - 09:40

ONT

LHR

19h 40m

2 stops

€436United Airlines

Mon, 27 Apr - Sat, 9 May

12:30 - 21:05

LHR

ONT

16h 35m

1 stop

13:10 - 10:00

ONT

LHR

12h 50m

1 stop

€439Delta

Tue, 10 Feb - Mon, 2 Mar

12:30 - 21:05

LHR

ONT

16h 35m

1 stop

13:15 - 11:40

ONT

LHR

14h 25m

1 stop

€440Delta

Wed, 11 Feb - Tue, 24 Feb

06:55 - 17:52

LHR

ONT

18h 57m

2 stops

18:59 - 21:35

ONT

LHR

18h 36m

2 stops

€441United Airlines

Mon, 4 May - Mon, 18 May

14:30 - 22:34

LHR

ONT

15h 04m

1 stop

12:50 - 09:00

ONT

LHR

13h 10m

1 stop

€442Multiple Airlines

Mon, 16 Mar - Mon, 23 Mar

07:30 - 21:58

LHR

ONT

22h 28m

2 stops

06:00 - 11:10

ONT

LHR

21h 10m

1 stop

€443United Airlines

Fri, 1 May - Fri, 15 May

15:05 - 22:37

LHR

ONT

15h 32m

1 stop

12:50 - 09:00

ONT

LHR

13h 10m

1 stop

€444Multiple Airlines

Sat, 7 Mar - Mon, 16 Mar

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

6 Feb

LHR14:25London Heathrow

15h 48m

1 stop

ONT22:13Ontario

17 Mar

ONT10:56Ontario

12h 54m

1 stop

LHR06:50London Heathrow

€479

British Airways

1 Jul

LHR12:55London Heathrow

16h 31m

1 stop

ONT21:26Ontario

13 Jul

ONT09:12Ontario

17h 53m

1 stop

LHR11:05London Heathrow

€501

British Airways

3 Apr

LHR16:25London Heathrow

15h 34m

1 stop

ONT23:59Ontario

17 Apr

ONT10:59Ontario

13h 06m

1 stop

LHR08:05London Heathrow

€510

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

16 Mar

LHR08:30London Heathrow

20h 48m

2 stops

ONT22:18Ontario

23 Mar

ONT13:50Ontario

12h 50m

1 stop

LHR09:40London Heathrow

€420

United Airlines

26 Feb

LHR09:30London Heathrow

19h 20m

2 stops

ONT20:50Ontario

5 Mar

ONT13:40Ontario

14h 20m

1 stop

LHR12:00London Heathrow

€428

United Airlines

27 Apr

LHR07:30London Heathrow

22h 20m

2 stops

ONT21:50Ontario

9 May

ONT13:30Ontario

13h 40m

1 stop

LHR11:10London Heathrow

€431

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 16/3

09:30-22:57

2 stops20h 27m

Ontario

Mon 23/3

18:37-20:35

2 stops18h 58m

€420

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

09:30-20:50

2 stops19h 20m

Ontario

Thu 5/3

13:40-12:00

1 stop14h 20m

€428

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

07:30-21:50

2 stops22h 20m

Ontario

Sat 9/5

13:30-11:10

1 stop13h 40m

€431

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

06:00-09:40

2 stops19h 40m

€436

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/2

12:30-21:05

1 stop16h 35m

Ontario

Mon 2/3

13:10-10:00

1 stop12h 50m

€439

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 11/2

12:30-21:05

1 stop16h 35m

Ontario

Tue 24/2

13:15-11:40

1 stop14h 25m

€440

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 4/5

06:55-17:52

2 stops18h 57m

Ontario

Mon 18/5

18:59-21:35

2 stops18h 36m

€441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 16/3

14:30-22:34

1 stop15h 04m

Ontario

Mon 23/3

12:50-09:00

1 stop13h 10m

€442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 1/5

07:30-21:58

2 stops22h 28m

Ontario

Fri 15/5

06:00-11:10

1 stop21h 10m

€443

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/3

15:05-22:37

1 stop15h 32m

Ontario

Mon 16/3

12:50-09:00

1 stop13h 10m

€444

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 €459.

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 €564 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 €443 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	14h 25m
Direct flights	None

The fastest flight from London to Ontario takes 14h 25m

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 14h 25m 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.