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

United Airlines is the most popular carrier 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.

€382 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 €449 to €585. The lowest price recently found on this route was €416.

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Find the cheapest flights from London to Los Angeles

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One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

13:30 - 22:57

LHR

ONT

17h 27m

2 stops

13:40 - 12:00

ONT

LHR

15h 20m

1 stop

€416United Airlines

Fri, 6 Mar - Thu, 19 Mar

13:30 - 22:57

LHR

ONT

17h 27m

2 stops

06:00 - 06:20

ONT

LHR

17h 20m

2 stops

€417United Airlines

Sun, 1 Mar - Wed, 11 Mar

11:35 - 20:50

LHR

ONT

17h 15m

1 stop

13:40 - 12:00

ONT

LHR

15h 20m

1 stop

€443United Airlines

Fri, 6 Mar - Thu, 19 Mar

10:05 - 17:41

LHR

ONT

15h 36m

1 stop

06:15 - 07:25

ONT

LHR

18h 10m

1 stop

€444United Airlines

Sun, 1 Mar - Wed, 11 Mar

10:05 - 17:41

LHR

ONT

14h 36m

1 stop

06:05 - 07:40

ONT

LHR

17h 35m

1 stop

€450United Airlines

Tue, 24 Mar - Sun, 29 Mar

10:05 - 17:41

LHR

ONT

15h 36m

1 stop

06:15 - 07:25

ONT

LHR

18h 10m

1 stop

€451United Airlines

Sat, 28 Feb - Sun, 8 Mar

10:05 - 17:41

LHR

ONT

15h 36m

1 stop

06:15 - 07:25

ONT

LHR

18h 10m

1 stop

€454United Airlines

Sat, 28 Feb - Sun, 8 Mar

13:35 - 22:18

LHR

ONT

15h 43m

1 stop

07:00 - 06:55

ONT

LHR

15h 55m

2 stops

€458United Airlines

Wed, 25 Mar - Wed, 1 Apr

10:05 - 17:41

LHR

ONT

14h 36m

1 stop

11:05 - 12:20

ONT

LHR

17h 15m

2 stops

€459United Airlines

Wed, 25 Mar - Wed, 1 Apr

08:20 - 16:19

LHR

ONT

15h 59m

1 stop

07:30 - 08:05

ONT

LHR

16h 35m

1 stop

€497British Airways

Wed, 4 Mar - Tue, 5 May

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

4 Mar

LHR08:20London Heathrow

15h 59m

1 stop

ONT16:19Ontario

5 May

ONT07:30Ontario

16h 35m

1 stop

LHR08:05London Heathrow

€497

British Airways

19 Feb

LHR11:45London Heathrow

17h 39m

1 stop

ONT21:24Ontario

25 Feb

ONT10:56Ontario

15h 04m

1 stop

LHR10:00London Heathrow

€497

British Airways

27 Feb

LHR10:35London Heathrow

19h 54m

1 stop

ONT22:29Ontario

9 Mar

ONT14:39Ontario

14h 01m

1 stop

LHR11:40London Heathrow

€498

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

27 Apr

LHR06:30London Heathrow

18h 45m

2 stops

ONT17:15Ontario

9 May

ONT13:35Ontario

14h 35m

1 stop

LHR12:10London Heathrow

€513

Delta

27 Apr

LHR06:30London Heathrow

18h 45m

2 stops

ONT17:15Ontario

9 May

ONT13:35Ontario

16h 15m

2 stops

LHR13:50London Heathrow

€534

Delta

5 May

LHR06:30London Heathrow

22h 30m

2 stops

ONT21:00Ontario

14 May

ONT13:35Ontario

18h 00m

1 stop

LHR15:35London Heathrow

€538

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 6/3

13:30-22:57

2 stops17h 27m

Ontario

Thu 19/3

13:40-12:00

1 stop15h 20m

€416

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/3

13:30-22:57

2 stops17h 27m

Ontario

Wed 11/3

06:00-06:20

2 stops17h 20m

€417

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 6/3

11:35-20:50

1 stop17h 15m

Ontario

Thu 19/3

13:40-12:00

1 stop15h 20m

€443

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/3

10:05-17:41

1 stop15h 36m

Ontario

Wed 11/3

06:15-07:25

1 stop18h 10m

€444

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 24/3

10:05-17:41

1 stop14h 36m

Ontario

Sun 29/3

06:05-07:40

1 stop17h 35m

€450

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/2

10:05-17:41

1 stop15h 36m

Ontario

Sun 8/3

06:15-07:25

1 stop18h 10m

€451

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/2

10:05-17:41

1 stop15h 36m

Ontario

Sun 8/3

06:15-07:25

1 stop18h 10m

€454

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

13:35-22:18

1 stop15h 43m

Ontario

Wed 1/4

07:00-06:55

2 stops15h 55m

€458

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

10:05-17:41

1 stop14h 36m

Ontario

Wed 1/4

11:05-12:20

2 stops17h 15m

€459

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/3

08:20-16:19

1 stop15h 59m

Ontario

Tue 5/5

07:30-08:05

1 stop16h 35m

€497

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 €472.

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 €446 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.