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

United Airlines and British Airways 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.

€432 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 €676 to €489. The lowest price recently found on this route was €565.

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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.

07:30 - 20:01

LHR

ONT

20h 31m

2 stops

13:18 - 12:25

ONT

LHR

15h 07m

1 stop

€565United Airlines

Tue, 22 Sep - Tue, 6 Oct

09:15 - 23:06

LHR

ONT

21h 51m

2 stops

23:59 - 09:00

ONT

LHR

25h 01m

1 stop

€583British Airways

Wed, 7 Oct - Sun, 11 Oct

09:15 - 23:06

LHR

ONT

21h 51m

2 stops

23:59 - 12:50

ONT

LHR

28h 51m

1 stop

€584British Airways

Wed, 7 Oct - Sun, 11 Oct

16:15 - 22:59

LHR

ONT

14h 44m

1 stop

13:56 - 11:10

ONT

LHR

13h 14m

1 stop

€589United Airlines

Thu, 3 Sep - Mon, 21 Sep

13:00 - 20:01

LHR

ONT

15h 01m

1 stop

13:18 - 12:25

ONT

LHR

15h 07m

1 stop

€590United Airlines

Fri, 11 Sep - Fri, 25 Sep

13:40 - 21:59

LHR

ONT

16h 19m

1 stop

13:18 - 12:25

ONT

LHR

15h 07m

1 stop

€591United Airlines

Mon, 7 Sep - Fri, 18 Sep

13:40 - 21:58

LHR

ONT

16h 18m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€592United Airlines

Thu, 1 Oct - Thu, 15 Oct

18:15 - 18:47

LHR

ONT

32h 32m

2 stops

14:27 - 12:10

ONT

LHR

13h 43m

1 stop

€596British Airways

Tue, 4 Aug - Thu, 27 Aug

15:00 - 22:34

LHR

ONT

15h 34m

1 stop

12:35 - 14:25

ONT

LHR

17h 50m

1 stop

€604British Airways

Tue, 21 Jul - Mon, 27 Jul

09:15 - 21:11

LHR

ONT

19h 56m

1 stop

12:59 - 11:05

ONT

LHR

14h 06m

1 stop

€605British Airways

Wed, 5 Aug - Thu, 13 Aug

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

7 Oct

LHR09:15London Heathrow

21h 51m

2 stops

ONT23:06Ontario

11 Oct

ONT23:59Ontario

25h 01m

1 stop

LHR09:00London Heathrow

€583

British Airways

7 Oct

LHR09:15London Heathrow

21h 51m

2 stops

ONT23:06Ontario

11 Oct

ONT23:59Ontario

28h 51m

1 stop

LHR12:50London Heathrow

€584

British Airways

4 Aug

LHR18:15London Heathrow

32h 32m

2 stops

ONT18:47Ontario

27 Aug

ONT14:27Ontario

13h 43m

1 stop

LHR12:10London Heathrow

€596

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

22 Sept

LHR07:30London Heathrow

20h 31m

2 stops

ONT20:01Ontario

6 Oct

ONT13:18Ontario

15h 07m

1 stop

LHR12:25London Heathrow

€565

United Airlines

3 Sept

LHR16:15London Heathrow

14h 44m

1 stop

ONT22:59Ontario

21 Sept

ONT13:56Ontario

13h 14m

1 stop

LHR11:10London Heathrow

€589

United Airlines

11 Sept

LHR13:00London Heathrow

15h 01m

1 stop

ONT20:01Ontario

25 Sept

ONT13:18Ontario

15h 07m

1 stop

LHR12:25London Heathrow

€590

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 22/9

07:30-20:01

2 stops20h 31m

Ontario

Tue 6/10

13:18-12:25

1 stop15h 07m

€565

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/10

09:15-23:06

2 stops21h 51m

Ontario

Sun 11/10

23:59-09:00

1 stop25h 01m

€583

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/10

09:15-23:06

2 stops21h 51m

Ontario

Sun 11/10

23:59-12:50

1 stop28h 51m

€584

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 3/9

16:15-22:59

1 stop14h 44m

Ontario

Mon 21/9

13:56-11:10

1 stop13h 14m

€589

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/9

13:00-20:01

1 stop15h 01m

Ontario

Fri 25/9

13:18-12:25

1 stop15h 07m

€590

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 7/9

13:40-21:59

1 stop16h 19m

Ontario

Fri 18/9

13:18-12:25

1 stop15h 07m

€591

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 1/10

13:40-21:58

1 stop16h 18m

Ontario

Thu 15/10

13:18-09:40

1 stop12h 22m

€592

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/8

18:15-18:47

2 stops32h 32m

Ontario

Thu 27/8

14:27-12:10

1 stop13h 43m

€596

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 21/7

15:00-22:34

1 stop15h 34m

Ontario

Mon 27/7

12:35-14:25

1 stop17h 50m

€604

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/8

09:15-21:11

1 stop19h 56m

Ontario

Thu 13/8

12:59-11:05

1 stop14h 06m

€605

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 €359.

How far in advance should I book a flight from London 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 €560 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 €426 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	14h 22m
Direct flights	None

The fastest flight from London to Ontario takes 14h 22m

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 14h 22m 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.