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.

€418 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 €647 to €830. The lowest price recently found on this route was €484.

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Find the cheapest flights from London to Los Angeles

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

07:25 - 22:51

LHR

ONT

23h 26m

2 stops

06:10 - 06:45

ONT

LHR

16h 35m

1 stop

€484United Airlines

Wed, 8 Jul - Mon, 13 Jul

09:30 - 20:06

LHR

ONT

18h 36m

2 stops

09:00 - 07:25

ONT

LHR

14h 25m

1 stop

€485United Airlines

Fri, 20 Nov - Sat, 28 Nov

09:30 - 21:55

LHR

ONT

20h 25m

2 stops

13:50 - 14:10

ONT

LHR

16h 20m

1 stop

€486United Airlines

Wed, 8 Jul - Thu, 16 Jul

09:30 - 20:53

LHR

ONT

19h 23m

2 stops

06:00 - 11:10

ONT

LHR

21h 10m

1 stop

€491United Airlines

Thu, 27 Aug - Wed, 9 Sep

13:40 - 21:57

LHR

ONT

16h 17m

1 stop

13:18 - 12:25

ONT

LHR

15h 07m

1 stop

€512United Airlines

Sat, 4 Jul - Mon, 6 Jul

13:00 - 20:01

LHR

ONT

15h 01m

1 stop

13:13 - 09:40

ONT

LHR

13h 27m

1 stop

€513United Airlines

Wed, 23 Sep - Fri, 30 Oct

11:25 - 20:58

LHR

ONT

17h 33m

1 stop

13:24 - 09:40

ONT

LHR

12h 16m

1 stop

€514United Airlines

Fri, 25 Sep - Wed, 30 Sep

14:50 - 20:58

LHR

ONT

14h 08m

1 stop

13:24 - 12:25

ONT

LHR

15h 01m

1 stop

€517United Airlines

Fri, 25 Sep - Fri, 9 Oct

11:05 - 22:51

LHR

ONT

19h 46m

1 stop

18:39 - 07:25

ONT

LHR

28h 46m

1 stop

€518United Airlines

Fri, 3 Jul - Fri, 10 Jul

10:00 - 21:55

LHR

ONT

19h 55m

1 stop

05:00 - 06:35

ONT

LHR

17h 35m

2 stops

€519United Airlines

Wed, 8 Jul - Sun, 12 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

8 Jul

LHR07:25London Heathrow

23h 26m

2 stops

ONT22:51Ontario

13 Jul

ONT06:10Ontario

16h 35m

1 stop

LHR06:45London Heathrow

€484

United Airlines

20 Nov

LHR09:30London Heathrow

18h 36m

2 stops

ONT20:06Ontario

28 Nov

ONT09:00Ontario

14h 25m

1 stop

LHR07:25London Heathrow

€485

United Airlines

8 Jul

LHR09:30London Heathrow

20h 25m

2 stops

ONT21:55Ontario

16 Jul

ONT13:50Ontario

16h 20m

1 stop

LHR14:10London Heathrow

€486

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

13 Aug

LHR09:20London Heathrow

33h 22m

1 stop

ONT10:42Ontario

15 Aug

ONT12:00Ontario

35h 15m

1 stop

LHR07:15London Heathrow

€596

Delta

8 Sept

LHR10:55London Heathrow

19h 09m

1 stop

ONT22:04Ontario

20 Sept

ONT18:00Ontario

13h 35m

1 stop

LHR15:35London Heathrow

€598

Delta

24 Aug

LHR13:25London Heathrow

16h 27m

1 stop

ONT21:52Ontario

23 Dec

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

€602

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

07:25-22:51

2 stops23h 26m

Ontario

Mon 13/7

06:10-06:45

1 stop16h 35m

€484

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/11

09:30-20:06

2 stops18h 36m

Ontario

Sat 28/11

09:00-07:25

1 stop14h 25m

€485

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

09:30-21:55

2 stops20h 25m

Ontario

Thu 16/7

13:50-14:10

1 stop16h 20m

€486

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 27/8

09:30-20:53

2 stops19h 23m

Ontario

Wed 9/9

06:00-11:10

1 stop21h 10m

€491

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/7

13:40-21:57

1 stop16h 17m

Ontario

Mon 6/7

13:18-12:25

1 stop15h 07m

€512

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 23/9

13:00-20:01

1 stop15h 01m

Ontario

Fri 30/10

13:13-09:40

1 stop13h 27m

€513

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 25/9

11:25-20:58

1 stop17h 33m

Ontario

Wed 30/9

13:24-09:40

1 stop12h 16m

€514

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 25/9

14:50-20:58

1 stop14h 08m

Ontario

Fri 9/10

13:24-12:25

1 stop15h 01m

€517

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/7

11:05-22:51

1 stop19h 46m

Ontario

Fri 10/7

18:39-07:25

1 stop28h 46m

€518

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

10:00-21:55

1 stop19h 55m

Ontario

Sun 12/7

05:00-06:35

2 stops17h 35m

€519

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 €365.

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.