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.

€371 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 €447 to €582. The lowest price recently found on this route was €424.

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Find the cheapest flights from London to Los Angeles

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One-way

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Cheap return flights

Enter your travel dates to find the best prices.

06:35 - 17:41

LHR

ONT

19h 06m

2 stops

13:50 - 09:40

ONT

LHR

12h 50m

1 stop

€424United Airlines

Tue, 3 Mar - Tue, 10 Mar

06:30 - 17:41

LHR

ONT

19h 11m

2 stops

13:50 - 09:40

ONT

LHR

12h 50m

1 stop

€425United Airlines

Sat, 28 Feb - Mon, 9 Mar

11:35 - 20:50

LHR

ONT

17h 15m

1 stop

13:50 - 09:40

ONT

LHR

12h 50m

1 stop

€452United Airlines

Sat, 28 Feb - Mon, 9 Mar

08:40 - 23:44

LHR

ONT

23h 04m

2 stops

17:55 - 15:35

ONT

LHR

13h 40m

1 stop

€453Delta

Wed, 10 Jun - Mon, 15 Jun

10:45 - 23:51

LHR

ONT

20h 06m

1 stop

11:59 - 12:10

ONT

LHR

16h 11m

1 stop

€457Delta

Wed, 25 Mar - Tue, 31 Mar

08:40 - 23:44

LHR

ONT

23h 04m

2 stops

17:55 - 15:35

ONT

LHR

13h 40m

1 stop

€459Delta

Wed, 29 Jul - Tue, 11 Aug

06:30 - 17:41

LHR

ONT

19h 11m

2 stops

13:50 - 09:40

ONT

LHR

12h 50m

1 stop

€461United Airlines

Sat, 28 Feb - Sun, 8 Mar

11:45 - 23:44

LHR

ONT

19h 59m

2 stops

07:00 - 12:10

ONT

LHR

21h 10m

1 stop

€462Delta

Wed, 10 Jun - Wed, 19 Aug

11:45 - 22:37

LHR

ONT

18h 52m

2 stops

13:35 - 12:10

ONT

LHR

14h 35m

1 stop

€463Delta

Mon, 27 Apr - Sat, 9 May

10:05 - 16:22

LHR

ONT

14h 17m

1 stop

14:08 - 12:10

ONT

LHR

14h 02m

1 stop

€464British Airways

Mon, 30 Mar - Thu, 23 Apr

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

10 Jun

LHR08:40London Heathrow

23h 04m

2 stops

ONT23:44Ontario

15 Jun

ONT17:55Ontario

13h 40m

1 stop

LHR15:35London Heathrow

€453

Delta

25 Mar

LHR10:45London Heathrow

20h 06m

1 stop

ONT23:51Ontario

31 Mar

ONT11:59Ontario

16h 11m

1 stop

LHR12:10London Heathrow

€457

Delta

29 Jul

LHR08:40London Heathrow

23h 04m

2 stops

ONT23:44Ontario

11 Aug

ONT17:55Ontario

13h 40m

1 stop

LHR15:35London Heathrow

€459

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

30 Mar

LHR10:05London Heathrow

14h 17m

1 stop

ONT16:22Ontario

23 Apr

ONT14:08Ontario

14h 02m

1 stop

LHR12:10London Heathrow

€464

British Airways

10 Mar

LHR10:15London Heathrow

15h 27m

1 stop

ONT18:42Ontario

17 Mar

ONT10:56Ontario

12h 54m

1 stop

LHR06:50London Heathrow

€465

British Airways

10 Mar

LHR10:15London Heathrow

15h 27m

1 stop

ONT18:42Ontario

24 Mar

ONT10:56Ontario

12h 54m

1 stop

LHR06:50London Heathrow

€466

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/3

06:35-17:41

2 stops19h 06m

Ontario

Tue 10/3

13:50-09:40

1 stop12h 50m

€424

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/2

06:30-17:41

2 stops19h 11m

Ontario

Mon 9/3

13:50-09:40

1 stop12h 50m

€425

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/2

11:35-20:50

1 stop17h 15m

Ontario

Mon 9/3

13:50-09:40

1 stop12h 50m

€452

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/6

08:40-23:44

2 stops23h 04m

Ontario

Mon 15/6

17:55-15:35

1 stop13h 40m

€453

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

10:45-23:51

1 stop20h 06m

Ontario

Tue 31/3

11:59-12:10

1 stop16h 11m

€457

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 29/7

08:40-23:44

2 stops23h 04m

Ontario

Tue 11/8

17:55-15:35

1 stop13h 40m

€459

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/2

06:30-17:41

2 stops19h 11m

Ontario

Sun 8/3

13:50-09:40

1 stop12h 50m

€461

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/6

11:45-23:44

2 stops19h 59m

Ontario

Wed 19/8

07:00-12:10

1 stop21h 10m

€462

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

11:45-22:37

2 stops18h 52m

Ontario

Sat 9/5

13:35-12:10

1 stop14h 35m

€463

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 30/3

10:05-16:22

1 stop14h 17m

Ontario

Thu 23/4

14:08-12:10

1 stop14h 02m

€464

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 €470.

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 €561 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 €444 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	15h 44m
Direct flights	None

The fastest flight from London to Ontario takes 15h 44m

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 15h 44m 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.