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

British Airways, JetBlue, 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.

€417 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 €721 to €579. The lowest price recently found on this route was €483.

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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.

06:55 - 20:53

LHR

ONT

21h 58m

2 stops

13:56 - 11:10

ONT

LHR

13h 14m

1 stop

€483United Airlines

Fri, 4 Sep - Tue, 8 Sep

09:30 - 21:55

LHR

ONT

20h 25m

2 stops

05:00 - 09:20

ONT

LHR

20h 20m

2 stops

€484United Airlines

Wed, 8 Jul - Mon, 13 Jul

06:55 - 12:47

LHR

ONT

37h 52m

2 stops

13:18 - 12:25

ONT

LHR

15h 07m

1 stop

€485United Airlines

Wed, 8 Jul - Mon, 13 Jul

09:30 - 23:06

LHR

ONT

21h 36m

2 stops

06:02 - 06:20

ONT

LHR

16h 18m

2 stops

€486United Airlines

Fri, 13 Nov - Tue, 17 Nov

09:30 - 23:06

LHR

ONT

21h 36m

2 stops

05:00 - 09:40

ONT

LHR

20h 40m

1 stop

€487United Airlines

Fri, 20 Nov - Sat, 28 Nov

09:30 - 23:06

LHR

ONT

21h 36m

2 stops

06:00 - 07:25

ONT

LHR

17h 25m

1 stop

€487United Airlines

Mon, 2 Nov - Mon, 16 Nov

15:30 - 21:59

LHR

ONT

38h 29m

2 stops

13:52 - 07:25

ONT

LHR

33h 33m

1 stop

€501United Airlines

Fri, 2 Oct - Fri, 9 Oct

13:00 - 22:37

LHR

ONT

17h 37m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€511United Airlines

Wed, 1 Jul - Mon, 6 Jul

13:40 - 21:55

LHR

ONT

16h 15m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€513United Airlines

Tue, 30 Jun - Tue, 21 Jul

13:00 - 22:50

LHR

ONT

17h 50m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€513United Airlines

Sat, 27 Jun - Sun, 5 Jul

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United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

4 Sept

LHR06:55London Heathrow

21h 58m

2 stops

ONT20:53Ontario

8 Sept

ONT13:56Ontario

13h 14m

1 stop

LHR11:10London Heathrow

€483

United Airlines

8 Jul

LHR09:30London Heathrow

20h 25m

2 stops

ONT21:55Ontario

13 Jul

ONT05:00Ontario

20h 20m

2 stops

LHR09:20London Heathrow

€484

United Airlines

8 Jul

LHR06:55London Heathrow

37h 52m

2 stops

ONT12:47Ontario

13 Jul

ONT13:18Ontario

15h 07m

1 stop

LHR12:25London Heathrow

€485

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

21 Nov

LHR15:00London Heathrow

15h 23m

1 stop

ONT22:23Ontario

13 Dec

ONT16:47Ontario

12h 28m

1 stop

LHR13:15London Heathrow

€609

British Airways

20 Jun

LHR09:15London Heathrow

21h 21m

1 stop

ONT22:36Ontario

5 Jul

ONT10:25Ontario

18h 25m

1 stop

LHR12:50London Heathrow

€850

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 4/9

06:55-20:53

2 stops21h 58m

Ontario

Tue 8/9

13:56-11:10

1 stop13h 14m

€483

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

09:30-21:55

2 stops20h 25m

Ontario

Mon 13/7

05:00-09:20

2 stops20h 20m

€484

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

06:55-12:47

2 stops37h 52m

Ontario

Mon 13/7

13:18-12:25

1 stop15h 07m

€485

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 13/11

09:30-23:06

2 stops21h 36m

Ontario

Tue 17/11

06:02-06:20

2 stops16h 18m

€486

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/11

09:30-23:06

2 stops21h 36m

Ontario

Sat 28/11

05:00-09:40

1 stop20h 40m

€487

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 2/11

09:30-23:06

2 stops21h 36m

Ontario

Mon 16/11

06:00-07:25

1 stop17h 25m

€487

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 2/10

15:30-21:59

2 stops38h 29m

Ontario

Fri 9/10

13:52-07:25

1 stop33h 33m

€501

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/7

13:00-22:37

1 stop17h 37m

Ontario

Mon 6/7

13:18-09:40

1 stop12h 22m

€511

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 30/6

13:40-21:55

1 stop16h 15m

Ontario

Tue 21/7

13:18-09:40

1 stop12h 22m

€513

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 27/6

13:00-22:50

1 stop17h 50m

Ontario

Sun 5/7

13:18-09:40

1 stop12h 22m

€513

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 €362.

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 €577 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 €429 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	13h 52m
Direct flights	None

The fastest flight from London to Ontario takes 13h 52m

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 13h 52m 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.