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

British Airways, United Airlines, and Lufthansa 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.

€373 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 €474 to €492. The lowest price recently found on this route was €442.

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Find the cheapest flights from London to Ontario

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

07:25 - 17:47

LHR

ONT

18h 22m

2 stops

07:00 - 08:30

ONT

LHR

17h 30m

1 stop

€442United Airlines

Sat, 18 Apr - Sat, 25 Apr

07:30 - 21:50

LHR

ONT

22h 20m

2 stops

13:30 - 11:10

ONT

LHR

13h 40m

1 stop

€443United Airlines

Mon, 27 Apr - Sat, 9 May

09:30 - 21:50

LHR

ONT

20h 20m

2 stops

13:30 - 14:10

ONT

LHR

16h 40m

1 stop

€445United Airlines

Mon, 27 Apr - Sat, 9 May

13:35 - 22:18

LHR

ONT

15h 43m

1 stop

13:27 - 11:10

ONT

LHR

13h 43m

1 stop

€455United Airlines

Wed, 18 Mar - Tue, 21 Apr

16:25 - 10:06

LHR

ONT

25h 41m

1 stop

10:59 - 08:05

ONT

LHR

13h 06m

1 stop

€458British Airways

Tue, 31 Mar - Thu, 30 Apr

16:25 - 10:06

LHR

ONT

25h 41m

1 stop

14:08 - 14:25

ONT

LHR

16h 17m

1 stop

€460British Airways

Tue, 31 Mar - Tue, 7 Apr

09:30 - 21:50

LHR

ONT

20h 20m

2 stops

06:00 - 09:40

ONT

LHR

19h 40m

2 stops

€461United Airlines

Mon, 27 Apr - Sat, 9 May

06:30 - 17:41

LHR

ONT

18h 11m

2 stops

23:59 - 05:55

ONT

LHR

22h 56m

1 stop

€464United Airlines

Thu, 19 Mar - Sun, 22 Mar

07:25 - 17:47

LHR

ONT

18h 22m

2 stops

06:00 - 07:25

ONT

LHR

17h 25m

1 stop

€466United Airlines

Mon, 20 Apr - Mon, 27 Apr

10:50 - 22:30

LHR

ONT

43h 40m

2 stops

23:59 - 08:05

ONT

LHR

24h 06m

1 stop

€467British Airways

Tue, 31 Mar - Wed, 29 Apr

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

31 Mar

LHR16:25London Heathrow

25h 41m

1 stop

ONT10:06Ontario

30 Apr

ONT10:59Ontario

13h 06m

1 stop

LHR08:05London Heathrow

€458

British Airways

11 Mar

LHR14:45London Heathrow

37h 39m

1 stop

ONT21:24Ontario

2 Apr

ONT14:39Ontario

13h 31m

1 stop

LHR12:10London Heathrow

€459

British Airways

31 Mar

LHR16:25London Heathrow

25h 41m

1 stop

ONT10:06Ontario

7 Apr

ONT14:08Ontario

16h 17m

1 stop

LHR14:25London Heathrow

€460

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

31 Mar

LHR10:55London Heathrow

13h 33m

1 stop

ONT16:28Ontario

14 Apr

ONT13:29Ontario

13h 31m

1 stop

LHR11:00London Heathrow

€500

Delta

1 Apr

LHR10:55London Heathrow

13h 33m

1 stop

ONT16:28Ontario

5 Apr

ONT17:53Ontario

13h 42m

1 stop

LHR15:35London Heathrow

€505

Delta

3 Aug

LHR20:05London Heathrow

30h 10m

2 stops

ONT18:15Ontario

25 Aug

ONT14:00Ontario

14h 10m

1 stop

LHR12:10London Heathrow

€508

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 18/4

07:25-17:47

2 stops18h 22m

Ontario

Sat 25/4

07:00-08:30

1 stop17h 30m

€442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

07:30-21:50

2 stops22h 20m

Ontario

Sat 9/5

13:30-11:10

1 stop13h 40m

€443

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

13:30-14:10

1 stop16h 40m

€445

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/3

13:35-22:18

1 stop15h 43m

Ontario

Tue 21/4

13:27-11:10

1 stop13h 43m

€455

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 31/3

16:25-10:06

1 stop25h 41m

Ontario

Thu 30/4

10:59-08:05

1 stop13h 06m

€458

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 31/3

16:25-10:06

1 stop25h 41m

Ontario

Tue 7/4

14:08-14:25

1 stop16h 17m

€460

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

06:00-09:40

2 stops19h 40m

€460

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 19/3

06:30-17:41

2 stops18h 11m

Ontario

Sun 22/3

23:59-05:55

1 stop22h 56m

€464

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 20/4

07:25-17:47

2 stops18h 22m

Ontario

Mon 27/4

06:00-07:25

1 stop17h 25m

€466

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 31/3

10:50-22:30

2 stops43h 40m

Ontario

Wed 29/4

23:59-08:05

1 stop24h 06m

€467

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 €480.

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 €583 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 €427 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	16h 15m
Direct flights	None

The fastest flight from London to Ontario takes 16h 15m

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 16h 15m 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.