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

British Airways, Alaska Airlines, and Delta 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.

€417 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 €600 to €680. The lowest price recently found on this route was €580.

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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.

06:20 - 22:43

LHR

ONT

24h 23m

2 stops

06:00 - 09:00

ONT

LHR

19h 00m

2 stops

€580Delta

Fri, 20 Nov - Thu, 3 Dec

08:55 - 18:18

LHR

ONT

16h 23m

1 stop

12:00 - 09:00

ONT

LHR

13h 00m

1 stop

€586Multiple Airlines

Thu, 29 Oct - Fri, 13 Nov

13:25 - 21:52

LHR

ONT

16h 27m

1 stop

18:00 - 15:35

ONT

LHR

13h 35m

1 stop

€587Delta

Fri, 28 Aug - Sat, 12 Sep

08:40 - 22:40

LHR

ONT

22h 00m

2 stops

06:00 - 07:05

ONT

LHR

17h 05m

2 stops

€590Delta

Fri, 11 Sep - Thu, 12 Nov

10:45 - 16:12

LHR

ONT

13h 27m

1 stop

12:00 - 09:00

ONT

LHR

13h 00m

1 stop

€592Multiple Airlines

Tue, 15 Dec - Fri, 8 Jan

11:40 - 22:40

LHR

ONT

19h 00m

1 stop

22:00 - 11:20

ONT

LHR

29h 20m

1 stop

€593Delta

Fri, 11 Sep - Fri, 18 Sep

12:30 - 22:01

LHR

ONT

16h 31m

1 stop

12:18 - 11:40

ONT

LHR

15h 22m

1 stop

€595Delta

Thu, 29 Oct - Sat, 7 Nov

13:25 - 11:07

LHR

ONT

29h 42m

1 stop

22:00 - 06:45

ONT

LHR

24h 45m

2 stops

€596Delta

Fri, 11 Sep - Sun, 13 Sep

06:15 - 17:21

LHR

ONT

19h 06m

2 stops

11:56 - 15:35

ONT

LHR

19h 39m

1 stop

€597Delta

Wed, 29 Jul - Wed, 5 Aug

10:55 - 16:35

LHR

ONT

13h 40m

1 stop

13:04 - 10:00

ONT

LHR

12h 56m

1 stop

€598KLM

Sat, 19 Sep - Sat, 26 Sep

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British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

29 Oct

LHR13:15London Heathrow

15h 39m

1 stop

ONT21:54Ontario

8 Nov

ONT14:59Ontario

13h 01m

1 stop

LHR12:00London Heathrow

€643

British Airways

4 Sept

LHR10:05London Heathrow

16h 42m

1 stop

ONT18:47Ontario

14 Sept

ONT14:22Ontario

14h 28m

1 stop

LHR12:50London Heathrow

€646

British Airways

1 Oct

LHR16:10London Heathrow

14h 33m

1 stop

ONT22:43Ontario

15 Oct

ONT13:31Ontario

12h 59m

1 stop

LHR10:30London Heathrow

€648

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

19 Sept

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

26 Sept

ONT13:04Ontario

12h 56m

1 stop

LHR10:00London Heathrow

€598

KLM

12 Sept

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

21 Sept

ONT13:04Ontario

12h 56m

1 stop

LHR10:00London Heathrow

€601

KLM

12 Sept

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

19 Sept

ONT13:04Ontario

12h 56m

1 stop

LHR10:00London Heathrow

€605

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/11

06:20-22:43

2 stops24h 23m

Ontario

Thu 3/12

06:00-09:00

2 stops19h 00m

€580

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 29/10

08:55-18:18

1 stop16h 23m

Ontario

Fri 13/11

12:00-09:00

1 stop13h 00m

€586

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 28/8

13:25-21:52

1 stop16h 27m

Ontario

Sat 12/9

18:00-15:35

1 stop13h 35m

€587

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/9

08:40-22:40

2 stops22h 00m

Ontario

Thu 12/11

06:00-07:05

2 stops17h 05m

€590

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 15/12

10:45-16:12

1 stop13h 27m

Ontario

Fri 8/1

12:00-09:00

1 stop13h 00m

€592

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/9

11:40-22:40

1 stop19h 00m

Ontario

Fri 18/9

22:00-11:20

1 stop29h 20m

€593

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 29/10

12:30-22:01

1 stop16h 31m

Ontario

Sat 7/11

12:18-11:40

1 stop15h 22m

€595

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/9

13:25-11:07

1 stop29h 42m

Ontario

Sun 13/9

22:00-06:45

2 stops24h 45m

€596

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 29/7

06:15-17:21

2 stops19h 06m

Ontario

Wed 5/8

11:56-15:35

1 stop19h 39m

€597

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 19/9

10:55-16:35

1 stop13h 40m

Ontario

Sat 26/9

13:04-10:00

1 stop12h 56m

€598

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 €366.

How far in advance should I book a flight from London 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 €584 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 €435 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 03m
Direct flights	None

The fastest flight from London to Ontario takes 14h 03m

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 14h 03m 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.