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

United Airlines and Alaska 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.

€449 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 €691 to €617. 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.

08:55 - 21:08

LHR

ONT

20h 13m

1 stop

10:25 - 10:55

ONT

LHR

16h 30m

1 stop

€564British Airways

Tue, 13 Oct - Thu, 22 Oct

06:55 - 17:51

LHR

ONT

18h 56m

2 stops

18:53 - 08:30

ONT

LHR

29h 37m

2 stops

€568United Airlines

Wed, 7 Oct - Fri, 20 Nov

16:25 - 09:29

LHR

ONT

25h 04m

1 stop

14:22 - 12:50

ONT

LHR

14h 28m

1 stop

€569British Airways

Mon, 12 Oct - Tue, 20 Oct

06:30 - 16:12

LHR

ONT

17h 42m

2 stops

12:00 - 12:05

ONT

LHR

16h 05m

2 stops

€570Delta

Mon, 12 Oct - Wed, 21 Oct

06:30 - 18:18

LHR

ONT

19h 48m

2 stops

17:50 - 15:35

ONT

LHR

13h 45m

1 stop

€577Delta

Wed, 14 Oct - Fri, 23 Oct

16:15 - 22:59

LHR

ONT

14h 44m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€585United Airlines

Fri, 4 Sep - Sun, 13 Sep

10:55 - 16:41

LHR

ONT

13h 46m

1 stop

18:01 - 15:35

ONT

LHR

13h 34m

1 stop

€586Delta

Sat, 4 Jul - Tue, 4 Aug

11:25 - 20:16

LHR

ONT

16h 51m

2 stops

09:39 - 07:25

ONT

LHR

13h 46m

1 stop

€588United Airlines

Thu, 24 Sep - Sat, 17 Oct

11:25 - 20:16

LHR

ONT

16h 51m

2 stops

09:39 - 07:25

ONT

LHR

13h 46m

1 stop

€589United Airlines

Thu, 24 Sep - Sat, 17 Oct

11:05 - 19:57

LHR

ONT

16h 52m

1 stop

09:01 - 07:25

ONT

LHR

14h 24m

1 stop

€590United Airlines

Tue, 8 Sep - Thu, 17 Sep

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

13 Oct

LHR08:55London Heathrow

20h 13m

1 stop

ONT21:08Ontario

22 Oct

ONT10:25Ontario

16h 30m

1 stop

LHR10:55London Heathrow

€564

British Airways

25 May

LHR11:00London Heathrow

15h 22m

1 stop

ONT18:22Ontario

21 Sept

ONT13:31Ontario

12h 59m

1 stop

LHR10:30London Heathrow

€568

British Airways

12 Oct

LHR16:25London Heathrow

25h 04m

1 stop

ONT09:29Ontario

20 Oct

ONT14:22Ontario

14h 28m

1 stop

LHR12:50London Heathrow

€569

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

12 Oct

LHR06:30London Heathrow

17h 42m

2 stops

ONT16:12Ontario

21 Oct

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

€570

Delta

14 Oct

LHR06:30London Heathrow

19h 48m

2 stops

ONT18:18Ontario

23 Oct

ONT17:50Ontario

13h 45m

1 stop

LHR15:35London Heathrow

€577

Delta

28 May

LHR13:25London Heathrow

16h 23m

1 stop

ONT21:48Ontario

4 Jun

ONT17:50Ontario

13h 45m

1 stop

LHR15:35London Heathrow

€583

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 13/10

08:55-21:08

1 stop20h 13m

Ontario

Thu 22/10

10:25-10:55

1 stop16h 30m

€564

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/10

06:55-17:51

2 stops18h 56m

Ontario

Fri 20/11

18:53-08:30

2 stops29h 37m

€568

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 12/10

16:25-09:29

1 stop25h 04m

Ontario

Tue 20/10

14:22-12:50

1 stop14h 28m

€569

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 12/10

06:30-16:12

2 stops17h 42m

Ontario

Wed 21/10

12:00-12:05

2 stops16h 05m

€570

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 14/10

06:30-18:18

2 stops19h 48m

Ontario

Fri 23/10

17:50-15:35

1 stop13h 45m

€577

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 4/9

16:15-22:59

1 stop14h 44m

Ontario

Sun 13/9

13:18-09:40

1 stop12h 22m

€585

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/7

10:55-16:41

1 stop13h 46m

Ontario

Tue 4/8

18:01-15:35

1 stop13h 34m

€586

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 24/9

11:25-20:16

2 stops16h 51m

Ontario

Sat 17/10

09:39-07:25

1 stop13h 46m

€588

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 24/9

11:25-20:16

2 stops16h 51m

Ontario

Sat 17/10

09:39-07:25

1 stop13h 46m

€589

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 8/9

11:05-19:57

1 stop16h 52m

Ontario

Thu 17/9

09:01-07:25

1 stop14h 24m

€590

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 €360.

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 €559 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	21h 21m
Direct flights	None

The fastest flight from London to Ontario takes 21h 21m

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 21h 21m 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.