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.

€354 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 typical for flights on this route. Typical prices usually range from €437 to €717. The lowest price recently found on this route was €441.

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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.

06:30 - 21:07LHR-ONT

22h 37m2 stops

18:00 - 20:10ONT-LHR

19h 10m2 stops

€441Delta

Find Deal

Mon, 2 Mar - Mon, 9 Mar

10:45 - 16:04LHR-ONT

13h 19m1 stop

13:00 - 09:00ONT-LHR

13h 00m1 stop

€455Delta

Find Deal

Sun, 1 Mar - Wed, 11 Mar

14:45 - 22:38LHR-ONT

14h 53m1 stop

13:00 - 08:50ONT-LHR

12h 50m1 stop

€463KLM

Find Deal

Thu, 12 Mar - Sat, 28 Mar

11:20 - 17:16LHR-ONT

13h 56m1 stop

13:00 - 09:50ONT-LHR

12h 50m1 stop

€469KLM

Find Deal

Fri, 17 Apr - Sat, 25 Apr

06:30 - 21:07LHR-ONT

22h 37m2 stops

22:20 - 06:25ONT-LHR

24h 05m1 stop

€474Delta

Find Deal

Thu, 26 Feb - Mon, 2 Mar

06:30 - 21:07LHR-ONT

22h 37m2 stops

06:00 - 10:15ONT-LHR

20h 15m2 stops

€475Delta

Find Deal

Thu, 26 Feb - Mon, 2 Mar

10:55 - 16:14LHR-ONT

13h 19m1 stop

13:00 - 09:50ONT-LHR

12h 50m1 stop

€476KLM

Find Deal

Wed, 15 Apr - Wed, 29 Apr

08:55 - 21:14LHR-ONT

19h 19m1 stop

11:55 - 09:00ONT-LHR

13h 05m1 stop

€478Delta

Find Deal

Mon, 9 Mar - Sun, 29 Mar

11:20 - 21:52LHR-ONT

17h 32m2 stops

06:45 - 14:15ONT-LHR

23h 30m1 stop

€480Virgin Atlantic

Find Deal

Sat, 28 Mar - Sat, 11 Apr

11:20 - 21:52LHR-ONT

17h 32m2 stops

11:55 - 14:15ONT-LHR

18h 20m1 stop

€481Virgin Atlantic

Find Deal

Sat, 28 Mar - Sat, 11 Apr

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

2 Mar

LHR06:30London Heathrow

22h 37m

2 stops

ONT21:07Ontario

9 Mar

ONT18:00Ontario

19h 10m

2 stops

LHR20:10London Heathrow

€441

Find similar

Delta

1 Mar

LHR10:45London Heathrow

13h 19m

1 stop

ONT16:04Ontario

11 Mar

ONT13:00Ontario

13h 00m

1 stop

LHR09:00London Heathrow

€455

Find similar

Delta

26 Feb

LHR06:30London Heathrow

22h 37m

2 stops

ONT21:07Ontario

2 Mar

ONT22:20Ontario

24h 05m

1 stop

LHR06:25London Heathrow

€474

Find similar

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

12 Mar

LHR14:45London Heathrow

14h 53m

1 stop

ONT22:38Ontario

28 Mar

ONT13:00Ontario

12h 50m

1 stop

LHR08:50London Heathrow

€463

Find similar

KLM

17 Apr

LHR11:20London Heathrow

13h 56m

1 stop

ONT17:16Ontario

25 Apr

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

€469

Find similar

KLM

15 Apr

LHR10:55London Heathrow

13h 19m

1 stop

ONT16:14Ontario

29 Apr

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

€476

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 2/3

06:30-21:07

2 stops22h 37m

Ontario

Mon 9/3

18:00-20:10

2 stops19h 10m

€441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/3

10:45-16:04

1 stop13h 19m

Ontario

Wed 11/3

13:00-09:00

1 stop13h 00m

€455

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 12/3

14:45-22:38

1 stop14h 53m

Ontario

Sat 28/3

13:00-08:50

1 stop12h 50m

€463

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 17/4

11:20-17:16

1 stop13h 56m

Ontario

Sat 25/4

13:00-09:50

1 stop12h 50m

€469

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

06:30-21:07

2 stops22h 37m

Ontario

Mon 2/3

22:20-06:25

1 stop24h 05m

€474

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

06:30-21:07

2 stops22h 37m

Ontario

Mon 2/3

06:00-10:15

2 stops20h 15m

€475

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/4

10:55-16:14

1 stop13h 19m

Ontario

Wed 29/4

13:00-09:50

1 stop12h 50m

€476

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 9/3

08:55-21:14

1 stop19h 19m

Ontario

Sun 29/3

11:55-09:00

1 stop13h 05m

€478

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

11:20-21:52

2 stops17h 32m

Ontario

Sat 11/4

06:45-14:15

1 stop23h 30m

€480

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

11:20-21:52

2 stops17h 32m

Ontario

Sat 11/4

11:55-14:15

1 stop18h 20m

€481

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 €475.

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 €639 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 €467 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.

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 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.