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.

€416 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 €776 to €694. The lowest price recently found on this route was €551.

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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.

06:30 - 22:44

LHR

ONT

24h 14m

2 stops

07:00 - 07:10

ONT

LHR

16h 10m

2 stops

€551Virgin Atlantic

Sat, 5 Sep - Sat, 19 Sep

08:40 - 22:34

LHR

ONT

21h 54m

2 stops

11:52 - 12:10

ONT

LHR

16h 18m

1 stop

€557Delta

Tue, 26 May - Tue, 2 Jun

08:40 - 21:56

LHR

ONT

21h 16m

2 stops

09:55 - 13:05

ONT

LHR

19h 10m

2 stops

€560Delta

Thu, 20 Aug - Mon, 31 Aug

13:25 - 21:56

LHR

ONT

16h 31m

1 stop

13:00 - 10:00

ONT

LHR

13h 00m

1 stop

€561Delta

Fri, 28 Aug - Sat, 26 Sep

07:25 - 22:59

LHR

ONT

23h 34m

2 stops

05:00 - 06:30

ONT

LHR

41h 30m

3 stops

€563United Airlines

Tue, 12 May - Tue, 19 May

12:00 - 21:11

LHR

ONT

17h 11m

1 stop

14:27 - 12:10

ONT

LHR

13h 43m

1 stop

€564British Airways

Wed, 19 Aug - Mon, 31 Aug

09:15 - 22:34

LHR

ONT

21h 19m

1 stop

14:22 - 12:50

ONT

LHR

14h 28m

1 stop

€565British Airways

Wed, 15 Jul - Wed, 14 Oct

11:00 - 18:15

LHR

ONT

15h 15m

1 stop

12:59 - 11:05

ONT

LHR

14h 06m

1 stop

€565British Airways

Tue, 11 Aug - Wed, 26 Aug

08:55 - 22:32

LHR

ONT

21h 37m

1 stop

23:59 - 10:55

ONT

LHR

26h 56m

1 stop

€566British Airways

Wed, 15 Jul - Sun, 11 Oct

08:55 - 22:58

LHR

ONT

22h 03m

1 stop

07:06 - 10:55

ONT

LHR

19h 49m

1 stop

€568British Airways

Wed, 5 Aug - Wed, 19 Aug

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Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

26 May

LHR08:40London Heathrow

21h 54m

2 stops

ONT22:34Ontario

2 Jun

ONT11:52Ontario

16h 18m

1 stop

LHR12:10London Heathrow

€557

Delta

20 Aug

LHR08:40London Heathrow

21h 16m

2 stops

ONT21:56Ontario

31 Aug

ONT09:55Ontario

19h 10m

2 stops

LHR13:05London Heathrow

€560

Delta

28 Aug

LHR13:25London Heathrow

16h 31m

1 stop

ONT21:56Ontario

26 Sept

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

€561

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

19 Aug

LHR12:00London Heathrow

17h 11m

1 stop

ONT21:11Ontario

31 Aug

ONT14:27Ontario

13h 43m

1 stop

LHR12:10London Heathrow

€564

British Airways

15 Jul

LHR09:15London Heathrow

21h 19m

1 stop

ONT22:34Ontario

14 Oct

ONT14:22Ontario

14h 28m

1 stop

LHR12:50London Heathrow

€565

British Airways

11 Aug

LHR11:00London Heathrow

15h 15m

1 stop

ONT18:15Ontario

26 Aug

ONT12:59Ontario

14h 06m

1 stop

LHR11:05London Heathrow

€565

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 5/9

06:30-22:44

2 stops24h 14m

Ontario

Sat 19/9

07:00-07:10

2 stops16h 10m

€551

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 26/5

08:40-22:34

2 stops21h 54m

Ontario

Tue 2/6

11:52-12:10

1 stop16h 18m

€557

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 20/8

08:40-21:56

2 stops21h 16m

Ontario

Mon 31/8

09:55-13:05

2 stops19h 10m

€560

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 28/8

13:25-21:56

1 stop16h 31m

Ontario

Sat 26/9

13:00-10:00

1 stop13h 00m

€561

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 12/5

07:25-22:59

2 stops23h 34m

Ontario

Tue 19/5

05:00-06:30

3 stops41h 30m

€563

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 19/8

12:00-21:11

1 stop17h 11m

Ontario

Mon 31/8

14:27-12:10

1 stop13h 43m

€564

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/7

09:15-22:34

1 stop21h 19m

Ontario

Wed 14/10

14:22-12:50

1 stop14h 28m

€565

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 11/8

11:00-18:15

1 stop15h 15m

Ontario

Wed 26/8

12:59-11:05

1 stop14h 06m

€565

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/7

08:55-22:32

1 stop21h 37m

Ontario

Sun 11/10

23:59-10:55

1 stop26h 56m

€566

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/8

08:55-22:58

1 stop22h 03m

Ontario

Wed 19/8

07:06-10:55

1 stop19h 49m

€568

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 December, then you should wait until March to fly from London, when ticket prices are also cheap, with an average price of €340.

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 €576 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 €424 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 21m
Direct flights	None

The fastest flight from London to Ontario takes 15h 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 15h 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.