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

British Airways, United Airlines, and Alaska 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.

€427 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 €602 to €682. The lowest price recently found on this route was €486.

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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 - 22:53

LHR

ONT

20h 23m

2 stops

06:46 - 07:55

ONT

LHR

17h 09m

1 stop

€486United Airlines

Fri, 30 Oct - Mon, 2 Nov

07:30 - 18:16

LHR

ONT

18h 46m

2 stops

13:18 - 20:40

ONT

LHR

23h 22m

2 stops

€487United Airlines

Sat, 29 Aug - Wed, 2 Sep

07:30 - 20:56

LHR

ONT

20h 26m

2 stops

05:00 - 09:40

ONT

LHR

21h 40m

1 stop

€488United Airlines

Sun, 25 Oct - Sat, 31 Oct

13:40 - 21:55

LHR

ONT

16h 15m

1 stop

13:50 - 11:10

ONT

LHR

13h 20m

1 stop

€513United Airlines

Thu, 9 Jul - Tue, 14 Jul

10:35 - 18:16

LHR

ONT

15h 41m

1 stop

13:24 - 09:40

ONT

LHR

12h 16m

1 stop

€515United Airlines

Wed, 23 Sep - Wed, 30 Sep

13:40 - 21:55

LHR

ONT

16h 15m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€516United Airlines

Thu, 9 Jul - Sun, 19 Jul

14:45 - 22:19

LHR

ONT

15h 34m

1 stop

14:42 - 12:15

ONT

LHR

13h 33m

1 stop

€548British Airways

Thu, 10 Dec - Thu, 24 Dec

11:00 - 23:36

LHR

ONT

20h 36m

1 stop

13:31 - 15:05

ONT

LHR

17h 34m

1 stop

€549British Airways

Thu, 1 Oct - Thu, 8 Oct

07:25 - 18:11

LHR

ONT

18h 46m

2 stops

13:56 - 11:10

ONT

LHR

13h 14m

1 stop

€568United Airlines

Fri, 21 Aug - Mon, 24 Aug

08:40 - 16:12

LHR

ONT

38h 32m

2 stops

22:59 - 07:50

ONT

LHR

24h 51m

1 stop

€579Delta

Tue, 27 Oct - Mon, 2 Nov

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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

€599

KLM

12 Sept

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

19 Sept

ONT13:04Ontario

12h 56m

1 stop

LHR10:00London Heathrow

€600

KLM

12 Sept

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

19 Sept

ONT13:04Ontario

12h 56m

1 stop

LHR10:00London Heathrow

€606

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

10 Dec

LHR14:45London Heathrow

15h 34m

1 stop

ONT22:19Ontario

24 Dec

ONT14:42Ontario

13h 33m

1 stop

LHR12:15London Heathrow

€548

British Airways

1 Oct

LHR11:00London Heathrow

20h 36m

1 stop

ONT23:36Ontario

8 Oct

ONT13:31Ontario

17h 34m

1 stop

LHR15:05London Heathrow

€549

British Airways

4 Sept

LHR10:05London Heathrow

16h 42m

1 stop

ONT18:47Ontario

14 Sept

ONT14:22Ontario

14h 28m

1 stop

LHR12:50London Heathrow

€647

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 30/10

09:30-22:53

2 stops20h 23m

Ontario

Mon 2/11

06:46-07:55

1 stop17h 09m

€486

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 29/8

07:30-18:16

2 stops18h 46m

Ontario

Wed 2/9

13:18-20:40

2 stops23h 22m

€487

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 25/10

07:30-20:56

2 stops20h 26m

Ontario

Sat 31/10

05:00-09:40

1 stop21h 40m

€488

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/7

13:40-21:55

1 stop16h 15m

Ontario

Tue 14/7

13:50-11:10

1 stop13h 20m

€513

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 23/9

10:35-18:16

1 stop15h 41m

Ontario

Wed 30/9

13:24-09:40

1 stop12h 16m

€515

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/7

13:40-21:55

1 stop16h 15m

Ontario

Sun 19/7

13:18-09:40

1 stop12h 22m

€516

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 10/12

14:45-22:19

1 stop15h 34m

Ontario

Thu 24/12

14:42-12:15

1 stop13h 33m

€548

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 1/10

11:00-23:36

1 stop20h 36m

Ontario

Thu 8/10

13:31-15:05

1 stop17h 34m

€549

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 21/8

07:25-18:11

2 stops18h 46m

Ontario

Mon 24/8

13:56-11:10

1 stop13h 14m

€568

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 27/10

08:40-16:12

2 stops38h 32m

Ontario

Mon 2/11

22:59-07:50

1 stop24h 51m

€579

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 €367.

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	27h 05m
Direct flights	None

The fastest flight from London to Ontario takes 27h 05m

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 27h 05m 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.