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.

€421 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 €598 to €677. The lowest price recently found on this route was €536.

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Find the cheapest flights from London to Los Angeles

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

09:30 - 21:59

LHR

ONT

20h 29m

2 stops

13:56 - 11:10

ONT

LHR

13h 14m

1 stop

€536United Airlines

Thu, 17 Sep - Mon, 21 Sep

06:35 - 20:56

LHR

ONT

22h 21m

2 stops

06:00 - 21:20

ONT

LHR

31h 20m

2 stops

€550United Airlines

Wed, 18 Nov - Thu, 19 Nov

14:50 - 20:53

LHR

ONT

14h 03m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€561United Airlines

Thu, 20 Aug - Sat, 5 Sep

13:00 - 20:01

LHR

ONT

15h 01m

1 stop

13:52 - 11:10

ONT

LHR

13h 18m

1 stop

€562United Airlines

Thu, 17 Sep - Thu, 24 Sep

14:10 - 22:35

LHR

ONT

16h 25m

1 stop

07:00 - 06:45

ONT

LHR

15h 45m

1 stop

€563United Airlines

Thu, 20 Aug - Fri, 4 Sep

13:40 - 18:12

LHR

ONT

36h 32m

1 stop

07:00 - 07:55

ONT

LHR

16h 55m

2 stops

€564United Airlines

Fri, 14 Aug - Thu, 27 Aug

14:10 - 22:35

LHR

ONT

16h 25m

1 stop

07:00 - 06:45

ONT

LHR

15h 45m

1 stop

€565United Airlines

Fri, 14 Aug - Fri, 4 Sep

10:55 - 16:35

LHR

ONT

13h 40m

1 stop

13:04 - 10:00

ONT

LHR

12h 56m

1 stop

€574KLM

Sat, 19 Sep - Fri, 2 Oct

08:45 - 20:01

LHR

ONT

19h 16m

2 stops

06:08 - 07:25

ONT

LHR

17h 17m

1 stop

€576United Airlines

Thu, 27 Aug - Sun, 13 Sep

11:35 - 20:20

LHR

ONT

16h 45m

1 stop

13:00 - 09:40

ONT

LHR

12h 40m

1 stop

€578United Airlines

Tue, 8 Dec - Wed, 9 Dec

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United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

17 Sept

LHR09:30London Heathrow

20h 29m

2 stops

ONT21:59Ontario

21 Sept

ONT13:56Ontario

13h 14m

1 stop

LHR11:10London Heathrow

€536

United Airlines

18 Nov

LHR06:35London Heathrow

22h 21m

2 stops

ONT20:56Ontario

19 Nov

ONT06:00Ontario

17h 40m

1 stop

LHR07:40London Heathrow

€550

United Airlines

20 Aug

LHR14:50London Heathrow

14h 03m

1 stop

ONT20:53Ontario

5 Sept

ONT13:18Ontario

12h 22m

1 stop

LHR09:40London Heathrow

€561

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

2 Nov

LHR12:20London Heathrow

18h 23m

1 stop

ONT22:43Ontario

12 Nov

ONT12:00Ontario

13h 00m

1 stop

LHR09:00London Heathrow

€587

Delta

5 Sept

LHR06:30London Heathrow

20h 00m

2 stops

ONT18:30Ontario

21 Sept

ONT17:15Ontario

18h 55m

2 stops

LHR20:10London Heathrow

€588

Delta

5 Sept

LHR06:30London Heathrow

17h 54m

2 stops

ONT16:24Ontario

18 Sept

ONT18:00Ontario

13h 35m

1 stop

LHR15:35London Heathrow

€592

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 17/9

09:30-21:59

2 stops20h 29m

Ontario

Mon 21/9

13:56-11:10

1 stop13h 14m

€536

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/11

06:35-20:56

2 stops22h 21m

Ontario

Thu 19/11

06:00-21:20

2 stops31h 20m

€550

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 20/8

14:50-20:53

1 stop14h 03m

Ontario

Sat 5/9

13:18-09:40

1 stop12h 22m

€561

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 17/9

13:00-20:01

1 stop15h 01m

Ontario

Thu 24/9

13:52-11:10

1 stop13h 18m

€562

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 20/8

14:10-22:35

1 stop16h 25m

Ontario

Fri 4/9

07:00-06:45

1 stop15h 45m

€563

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 14/8

13:40-18:12

1 stop36h 32m

Ontario

Thu 27/8

07:00-07:55

2 stops16h 55m

€564

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 14/8

14:10-22:35

1 stop16h 25m

Ontario

Fri 4/9

07:00-06:45

1 stop15h 45m

€565

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 19/9

10:55-16:35

1 stop13h 40m

Ontario

Fri 2/10

13:04-10:00

1 stop12h 56m

€574

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 27/8

08:45-20:01

2 stops19h 16m

Ontario

Sun 13/9

06:08-07:25

1 stop17h 17m

€576

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 8/12

11:35-20:20

1 stop16h 45m

Ontario

Wed 9/12

13:00-09:40

1 stop12h 40m

€578

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 March, then you should wait until February to fly from London, when ticket prices are also cheap, with an average price of €365.

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	13h 52m
Direct flights	None

The fastest flight from London to Ontario takes 13h 52m

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

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Frequently asked questions about flying from London to Ontario

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 52m 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.