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

British Airways, United Airlines, and KLM 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.

€357 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 €516 to €697. The lowest price recently found on this route was €453.

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Find the cheapest flights from London to Los Angeles

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One-way

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Cheap return flights

Enter your travel dates to find the best prices.

11:45 - 11:59LHR-ONT

32h 14m2 stops

07:30 - 12:50ONT-LHR

21h 20m1 stop

€453Delta

Find Deal

Thu, 26 Feb - Mon, 2 Mar

08:55 - 21:07LHR-ONT

20h 12m1 stop

15:30 - 12:50ONT-LHR

13h 20m1 stop

€469Delta

Find Deal

Thu, 26 Feb - Mon, 2 Mar

06:30 - 21:07LHR-ONT

22h 37m2 stops

07:30 - 10:30ONT-LHR

19h 00m1 stop

€487Delta

Find Deal

Thu, 26 Feb - Mon, 2 Mar

14:45 - 22:38LHR-ONT

14h 53m1 stop

13:00 - 09:50ONT-LHR

12h 50m1 stop

€498KLM

Find Deal

Thu, 19 Mar - Wed, 1 Apr

14:45 - 22:38LHR-ONT

14h 53m1 stop

13:00 - 08:50ONT-LHR

12h 50m1 stop

€500KLM

Find Deal

Mon, 16 Mar - Sat, 28 Mar

10:45 - 23:53LHR-ONT

21h 08m1 stop

13:10 - 10:00ONT-LHR

12h 50m1 stop

€503Virgin Atlantic

Find Deal

Thu, 26 Feb - Mon, 2 Mar

13:45 - 22:49LHR-ONT

17h 04m1 stop

13:34 - 09:40ONT-LHR

12h 06m1 stop

€565United Airlines

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Wed, 3 Dec - Wed, 10 Dec

15:00 - 22:48LHR-ONT

15h 48m1 stop

16:59 - 13:15ONT-LHR

12h 16m1 stop

€569British Airways

Find Deal

Tue, 10 Feb - Tue, 17 Feb

09:30 - 21:59LHR-ONT

20h 29m2 stops

18:37 - 20:35ONT-LHR

17h 58m2 stops

€579United Airlines

Find Deal

Thu, 26 Feb - Mon, 2 Mar

10:05 - 18:17LHR-ONT

16h 12m1 stop

12:45 - 10:00ONT-LHR

13h 15m1 stop

€607British Airways

Find Deal

Mon, 8 Dec - Tue, 23 Dec

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

26 Feb

LHR11:45London Heathrow

32h 14m

2 stops

ONT11:59Ontario

2 Mar

ONT07:30Ontario

21h 20m

1 stop

LHR12:50London Heathrow

€453

Find similar

Delta

26 Feb

LHR08:55London Heathrow

20h 12m

1 stop

ONT21:07Ontario

2 Mar

ONT15:30Ontario

13h 20m

1 stop

LHR12:50London Heathrow

€469

Find similar

Delta

26 Feb

LHR06:30London Heathrow

22h 37m

2 stops

ONT21:07Ontario

2 Mar

ONT07:30Ontario

19h 00m

1 stop

LHR10:30London Heathrow

€487

Find similar

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

19 Mar

LHR14:45London Heathrow

14h 53m

1 stop

ONT22:38Ontario

1 Apr

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

€498

Find similar

KLM

16 Mar

LHR14:45London Heathrow

14h 53m

1 stop

ONT22:38Ontario

28 Mar

ONT13:00Ontario

12h 50m

1 stop

LHR08:50London Heathrow

€500

Find similar

KLM

9 Mar

LHR14:45London Heathrow

14h 53m

1 stop

ONT22:38Ontario

31 Mar

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

€505

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

11:45-11:59

2 stops32h 14m

Ontario

Mon 2/3

07:30-12:50

1 stop21h 20m

€453

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

08:55-21:07

1 stop20h 12m

Ontario

Mon 2/3

15:30-12:50

1 stop13h 20m

€469

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

06:30-21:07

2 stops22h 37m

Ontario

Mon 2/3

07:30-10:30

1 stop19h 00m

€487

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 19/3

14:45-22:38

1 stop14h 53m

Ontario

Wed 1/4

13:00-09:50

1 stop12h 50m

€498

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 16/3

14:45-22:38

1 stop14h 53m

Ontario

Sat 28/3

13:00-08:50

1 stop12h 50m

€500

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

10:45-23:53

1 stop21h 08m

Ontario

Mon 2/3

13:10-10:00

1 stop12h 50m

€503

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 3/12

13:45-22:49

1 stop17h 04m

Ontario

Wed 10/12

13:34-09:40

1 stop12h 06m

€565

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/2

15:00-22:48

1 stop15h 48m

Ontario

Tue 17/2

16:59-13:15

1 stop12h 16m

€569

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

09:30-21:59

2 stops20h 29m

Ontario

Mon 2/3

18:37-20:35

2 stops17h 58m

€579

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 8/12

10:05-18:17

1 stop16h 12m

Ontario

Tue 23/12

12:45-10:00

1 stop13h 15m

€607

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 September, then you should wait until January to fly from London, when ticket prices are also cheap, with an average price of €483.

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 €624 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 €471 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

Direct flights	None

There are no direct flights from London to Ontario. There are no popular flight routes from London to Ontario.

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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.