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.

€429 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 €758 to €544. The lowest price recently found on this route was €564.

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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.

11:00 - 18:22

LHR

ONT

15h 22m

1 stop

13:10 - 15:05

ONT

LHR

17h 55m

1 stop

€564British Airways

Mon, 25 May - Mon, 8 Jun

10:55 - 16:35

LHR

ONT

13h 40m

1 stop

18:01 - 15:35

ONT

LHR

13h 34m

1 stop

€566Delta

Wed, 22 Jul - Wed, 29 Jul

11:00 - 18:15

LHR

ONT

15h 15m

1 stop

14:27 - 12:10

ONT

LHR

13h 43m

1 stop

€567British Airways

Mon, 17 Aug - Tue, 8 Sep

10:55 - 16:42

LHR

ONT

13h 47m

1 stop

18:01 - 15:35

ONT

LHR

13h 34m

1 stop

€569Delta

Wed, 1 Jul - Thu, 9 Jul

11:40 - 22:34

LHR

ONT

18h 54m

1 stop

17:50 - 15:35

ONT

LHR

13h 45m

1 stop

€571Delta

Wed, 20 May - Wed, 3 Jun

14:25 - 21:12

LHR

ONT

14h 47m

1 stop

16:59 - 15:05

ONT

LHR

14h 06m

1 stop

€572British Airways

Tue, 18 Aug - Thu, 10 Sep

10:55 - 16:42

LHR

ONT

13h 47m

1 stop

18:01 - 15:35

ONT

LHR

13h 34m

1 stop

€573Delta

Wed, 1 Jul - Thu, 16 Jul

17:45 - 11:12

LHR

ONT

25h 27m

1 stop

13:35 - 12:10

ONT

LHR

14h 35m

1 stop

€574Delta

Tue, 19 May - Sat, 30 May

11:40 - 22:34

LHR

ONT

18h 54m

1 stop

13:29 - 11:00

ONT

LHR

13h 31m

1 stop

€575Delta

Mon, 18 May - Tue, 2 Jun

11:30 - 23:46

LHR

ONT

20h 16m

2 stops

10:59 - 08:05

ONT

LHR

13h 06m

1 stop

€579British Airways

Sat, 2 May - Thu, 7 May

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Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

22 Jul

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

29 Jul

ONT18:01Ontario

13h 34m

1 stop

LHR15:35London Heathrow

€566

Delta

1 Jul

LHR10:55London Heathrow

13h 47m

1 stop

ONT16:42Ontario

9 Jul

ONT18:01Ontario

13h 34m

1 stop

LHR15:35London Heathrow

€569

Delta

20 May

LHR11:40London Heathrow

18h 54m

1 stop

ONT22:34Ontario

3 Jun

ONT17:50Ontario

13h 45m

1 stop

LHR15:35London Heathrow

€571

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

21 May

LHR10:55London Heathrow

13h 22m

1 stop

ONT16:17Ontario

2 Jun

ONT13:29Ontario

13h 31m

1 stop

LHR11:00London Heathrow

€579

KLM

25 Jun

LHR10:55London Heathrow

13h 47m

1 stop

ONT16:42Ontario

4 Jul

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

€581

KLM

19 May

LHR10:55London Heathrow

13h 22m

1 stop

ONT16:17Ontario

3 Jun

ONT13:29Ontario

12h 31m

1 stop

LHR10:00London Heathrow

€602

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 25/5

11:00-18:22

1 stop15h 22m

Ontario

Mon 8/6

13:10-15:05

1 stop17h 55m

€564

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 22/7

10:55-16:35

1 stop13h 40m

Ontario

Wed 29/7

18:01-15:35

1 stop13h 34m

€566

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 17/8

11:00-18:15

1 stop15h 15m

Ontario

Tue 8/9

14:27-12:10

1 stop13h 43m

€567

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/7

10:55-16:42

1 stop13h 47m

Ontario

Thu 9/7

18:01-15:35

1 stop13h 34m

€569

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 20/5

11:40-22:34

1 stop18h 54m

Ontario

Wed 3/6

17:50-15:35

1 stop13h 45m

€571

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 18/8

14:25-21:12

1 stop14h 47m

Ontario

Thu 10/9

16:59-15:05

1 stop14h 06m

€572

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/7

10:55-16:42

1 stop13h 47m

Ontario

Thu 16/7

18:01-15:35

1 stop13h 34m

€573

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 19/5

17:45-11:12

1 stop25h 27m

Ontario

Sat 30/5

13:35-12:10

1 stop14h 35m

€574

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 18/5

11:40-22:34

1 stop18h 54m

Ontario

Tue 2/6

13:29-11:00

1 stop13h 31m

€575

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 2/5

11:30-23:46

2 stops20h 16m

Ontario

Thu 7/5

10:59-08:05

1 stop13h 06m

€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 September, then you should wait until February to fly from London, when ticket prices are also cheap, with an average price of €474.

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 €572 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 €421 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	13h 46m
Direct flights	None

The fastest flight from London to Ontario takes 13h 46m

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 46m 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.