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

JetBlue, Delta, 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.

€456 Cheap Flights from London to Ontario (LON-ONT) in 2025

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Find the cheapest flights from London to Los Angeles (LON-ONT)

Round-trip

One-way

Last minute

Cheap return flights

07:35 - 22:29LHR-ONT

22h 54m2 stops

10:47 - 12:15ONT-LHR

17h 28m1 stop

€456British Airways

Find Deal

Wed, 19 Nov - Wed, 26 Nov

16:25 - 23:59LHR-ONT

15h 34m1 stop

14:54 - 14:25ONT-LHR

15h 31m1 stop

€473British Airways

Find Deal

Sun, 14 Sep - Wed, 24 Sep

15:10 - 23:59LHR-ONT

16h 49m1 stop

14:51 - 12:45ONT-LHR

13h 54m1 stop

€483British Airways

Find Deal

Thu, 9 Oct - Thu, 16 Oct

06:30 - 17:10LHR-ONT

18h 40m2 stops

11:48 - 14:15ONT-LHR

18h 27m1 stop

€490Delta

Find Deal

Thu, 9 Oct - Thu, 16 Oct

10:45 - 16:19LHR-ONT

13h 34m1 stop

13:00 - 09:00ONT-LHR

13h 00m1 stop

€499

Find Deal

Sun, 22 Feb - Wed, 25 Mar

13:25 - 22:41LHR-ONT

17h 16m1 stop

13:15 - 09:50ONT-LHR

12h 35m1 stop

€503Delta

Find Deal

Fri, 17 Oct - Tue, 21 Oct

13:35 - 22:25LHR-ONT

16h 50m1 stop

07:00 - 05:55ONT-LHR

14h 55m1 stop

€570United Airlines

Find Deal

Wed, 31 Dec - Mon, 19 Jan

07:40 - 22:25LHR-ONT

22h 45m1 stop

07:00 - 05:55ONT-LHR

14h 55m1 stop

€582United Airlines

Find Deal

Tue, 30 Dec - Mon, 19 Jan

10:45 - 16:14LHR-ONT

13h 29m1 stop

11:56 - 09:00ONT-LHR

13h 04m1 stop

€589

Find Deal

Sat, 6 Dec - Mon, 22 Dec

13:25 - 23:39LHR-ONT

18h 14m2 stops

07:05 - 10:15ONT-LHR

19h 10m2 stops

€592Virgin Atlantic

Find Deal

Thu, 9 Oct - Thu, 16 Oct

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

19 Nov

LHR07:35London Heathrow

22h 54m

2 stops

ONT22:29Ontario

26 Nov

ONT10:47Ontario

17h 28m

1 stop

LHR12:15London Heathrow

€456

Find similar

British Airways

14 Sept

LHR16:25London Heathrow

15h 34m

1 stop

ONT23:59Ontario

24 Sept

ONT14:54Ontario

15h 31m

1 stop

LHR14:25London Heathrow

€473

Find similar

British Airways

9 Oct

LHR15:10London Heathrow

16h 49m

1 stop

ONT23:59Ontario

16 Oct

ONT14:51Ontario

13h 54m

1 stop

LHR12:45London Heathrow

€483

Find similar

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

9 Oct

LHR06:30London Heathrow

18h 40m

2 stops

ONT17:10Ontario

16 Oct

ONT11:48Ontario

18h 27m

1 stop

LHR14:15London Heathrow

€490

Find similar

Delta

17 Oct

LHR13:25London Heathrow

17h 16m

1 stop

ONT22:41Ontario

22 Oct

ONT13:15Ontario

12h 35m

1 stop

LHR09:50London Heathrow

€503

Find similar

Delta

9 Oct

LHR09:55London Heathrow

20h 46m

2 stops

ONT22:41Ontario

16 Oct

ONT11:36Ontario

15h 49m

2 stops

LHR11:25London Heathrow

€507

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 19/11

07:35-22:29

2 stops22h 54m

Ontario

Wed 26/11

10:47-12:15

1 stop17h 28m

€456

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 14/9

16:25-23:59

1 stop15h 34m

Ontario

Wed 24/9

14:54-14:25

1 stop15h 31m

€473

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/10

15:10-23:59

1 stop16h 49m

Ontario

Thu 16/10

14:51-12:45

1 stop13h 54m

€483

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/10

06:30-17:10

2 stops18h 40m

Ontario

Thu 16/10

11:48-14:15

1 stop18h 27m

€490

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 22/2

10:45-16:19

1 stop13h 34m

Ontario

Wed 25/3

13:00-09:00

1 stop13h 00m

€499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 17/10

13:25-22:41

1 stop17h 16m

Ontario

Tue 21/10

13:15-09:50

1 stop12h 35m

€503

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 31/12

13:35-22:25

1 stop16h 50m

Ontario

Mon 19/1

07:00-05:55

1 stop14h 55m

€570

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 30/12

07:40-22:25

1 stop22h 45m

Ontario

Mon 19/1

07:00-05:55

1 stop14h 55m

€582

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 6/12

10:45-16:14

1 stop13h 29m

Ontario

Mon 22/12

11:56-09:00

1 stop13h 04m

€589

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/10

13:25-23:39

2 stops18h 14m

Ontario

Thu 16/10

07:05-10:15

2 stops19h 10m

€592

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 cheapest month to fly to Ontario?

If you don’t want to visit Ontario in February, then you should wait until January 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 €609 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 €494 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

Direct flights	None

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 13h 29m 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.