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

British Airways and United Airlines 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.

€404 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 typical for flights on this route. Typical prices usually range from €474 to €620. The lowest price recently found on this route was €524.

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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.

09:00 - 22:45

LHR

ONT

21h 45m

2 stops

06:00 - 09:40

ONT

LHR

19h 40m

2 stops

€524United Airlines

Sun, 19 Apr - Sun, 26 Apr

10:50 - 22:59

LHR

ONT

20h 09m

2 stops

18:59 - 14:10

ONT

LHR

35h 11m

1 stop

€525United Airlines

Fri, 1 May - Wed, 6 May

10:50 - 22:45

LHR

ONT

19h 55m

2 stops

13:27 - 14:10

ONT

LHR

16h 43m

1 stop

€525United Airlines

Sat, 18 Apr - Sat, 25 Apr

07:25 - 09:41

LHR

ONT

34h 16m

2 stops

13:18 - 21:25

ONT

LHR

24h 07m

2 stops

€537United Airlines

Sun, 10 May - Fri, 29 May

09:15 - 23:46

LHR

ONT

22h 31m

2 stops

23:59 - 14:25

ONT

LHR

30h 26m

1 stop

€541British Airways

Mon, 27 Apr - Sat, 9 May

15:30 - 21:50

LHR

ONT

38h 20m

2 stops

13:40 - 12:20

ONT

LHR

14h 40m

1 stop

€542United Airlines

Mon, 27 Apr - Sat, 9 May

09:15 - 23:46

LHR

ONT

22h 31m

2 stops

14:08 - 14:25

ONT

LHR

16h 17m

1 stop

€550British Airways

Mon, 27 Apr - Sat, 9 May

11:25 - 20:36

LHR

ONT

17h 11m

1 stop

13:34 - 12:35

ONT

LHR

15h 01m

1 stop

€550United Airlines

Mon, 13 Apr - Sun, 26 Apr

14:50 - 20:36

LHR

ONT

13h 46m

1 stop

07:00 - 06:45

ONT

LHR

15h 45m

1 stop

€551United Airlines

Mon, 13 Apr - Mon, 27 Apr

14:50 - 20:36

LHR

ONT

13h 46m

1 stop

13:34 - 12:35

ONT

LHR

15h 01m

1 stop

€552United Airlines

Mon, 13 Apr - Sun, 26 Apr

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

19 Apr

LHR09:00London Heathrow

21h 45m

2 stops

ONT22:45Ontario

26 Apr

ONT07:00Ontario

15h 45m

1 stop

LHR06:45London Heathrow

€524

United Airlines

1 May

LHR10:50London Heathrow

20h 09m

2 stops

ONT22:59Ontario

6 May

ONT18:59Ontario

35h 11m

1 stop

LHR14:10London Heathrow

€524

United Airlines

18 Apr

LHR10:50London Heathrow

19h 55m

2 stops

ONT22:45Ontario

25 Apr

ONT13:27Ontario

16h 43m

1 stop

LHR14:10London Heathrow

€525

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

2 May

LHR10:55London Heathrow

13h 30m

1 stop

ONT16:25Ontario

29 May

ONT13:29Ontario

12h 31m

1 stop

LHR10:00London Heathrow

€585

KLM

30 Apr

LHR17:45London Heathrow

36h 52m

1 stop

ONT22:37Ontario

8 May

ONT11:52Ontario

19h 43m

1 stop

LHR15:35London Heathrow

€596

KLM

1 Apr

LHR10:55London Heathrow

13h 33m

1 stop

ONT16:28Ontario

15 Apr

ONT13:29Ontario

12h 31m

1 stop

LHR10:00London Heathrow

€995

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 19/4

09:00-22:45

2 stops21h 45m

Ontario

Sun 26/4

06:00-09:40

2 stops19h 40m

€524

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 1/5

10:50-22:59

2 stops20h 09m

Ontario

Wed 6/5

18:59-14:10

1 stop35h 11m

€524

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 18/4

10:50-22:45

2 stops19h 55m

Ontario

Sat 25/4

13:27-14:10

1 stop16h 43m

€525

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 10/5

07:25-09:41

2 stops34h 16m

Ontario

Fri 29/5

13:18-21:25

2 stops24h 07m

€537

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:15-23:46

2 stops22h 31m

Ontario

Sat 9/5

23:59-14:25

1 stop30h 26m

€541

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

15:30-21:50

2 stops38h 20m

Ontario

Sat 9/5

13:40-12:20

1 stop14h 40m

€542

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:15-23:46

2 stops22h 31m

Ontario

Sat 9/5

14:08-14:25

1 stop16h 17m

€550

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

11:25-20:36

1 stop17h 11m

Ontario

Sun 26/4

13:34-12:35

1 stop15h 01m

€550

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:36

1 stop13h 46m

Ontario

Mon 27/4

07:00-06:45

1 stop15h 45m

€551

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:36

1 stop13h 46m

Ontario

Sun 26/4

13:34-12:35

1 stop15h 01m

€552

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 February to fly from London, when ticket prices are also cheap, with an average price of €482.

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 €586 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 €429 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 17m
Direct flights	None

The fastest flight from London to Ontario takes 14h 17m

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 17m 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.