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.

€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 €677 to €490. The lowest price recently found on this route was €547.

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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.

11:00 - 18:15

LHR

ONT

15h 15m

1 stop

14:59 - 12:00

ONT

LHR

13h 01m

1 stop

€547British Airways

Thu, 3 Sep - Tue, 3 Nov

15:00 - 23:06

LHR

ONT

15h 06m

1 stop

14:59 - 12:00

ONT

LHR

13h 01m

1 stop

€547British Airways

Wed, 28 Oct - Sat, 7 Nov

08:55 - 18:47

LHR

ONT

17h 52m

1 stop

14:27 - 14:25

ONT

LHR

15h 58m

1 stop

€565British Airways

Fri, 4 Sep - Tue, 8 Sep

15:00 - 22:34

LHR

ONT

15h 34m

1 stop

10:25 - 09:00

ONT

LHR

14h 35m

1 stop

€566British Airways

Wed, 8 Jul - Wed, 22 Jul

13:25 - 21:50

LHR

ONT

16h 25m

1 stop

18:01 - 15:35

ONT

LHR

13h 34m

1 stop

€598Delta

Thu, 9 Jul - Wed, 22 Jul

14:25 - 21:59

LHR

ONT

15h 34m

1 stop

14:59 - 12:00

ONT

LHR

13h 01m

1 stop

€607British Airways

Mon, 2 Nov - Mon, 9 Nov

14:25 - 21:59

LHR

ONT

15h 34m

1 stop

16:47 - 13:15

ONT

LHR

12h 28m

1 stop

€608British Airways

Mon, 2 Nov - Wed, 25 Nov

10:55 - 16:24

LHR

ONT

13h 29m

1 stop

13:00 - 10:00

ONT

LHR

13h 00m

1 stop

€609KLM

Sat, 29 Aug - Mon, 14 Sep

14:25 - 09:34

LHR

ONT

27h 09m

1 stop

12:33 - 12:50

ONT

LHR

16h 17m

1 stop

€611British Airways

Fri, 21 Aug - Sat, 29 Aug

11:45 - 23:48

LHR

ONT

20h 03m

2 stops

13:00 - 10:00

ONT

LHR

13h 00m

1 stop

€612Delta

Wed, 15 Jul - Mon, 20 Jul

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

3 Sept

LHR11:00London Heathrow

15h 15m

1 stop

ONT18:15Ontario

3 Nov

ONT14:59Ontario

13h 01m

1 stop

LHR12:00London Heathrow

€547

British Airways

28 Oct

LHR15:00London Heathrow

15h 06m

1 stop

ONT23:06Ontario

7 Nov

ONT14:59Ontario

13h 01m

1 stop

LHR12:00London Heathrow

€547

British Airways

4 Sept

LHR08:55London Heathrow

17h 52m

1 stop

ONT18:47Ontario

8 Sept

ONT14:27Ontario

15h 58m

1 stop

LHR14:25London Heathrow

€565

Alaska Airlines flights from London to Ontario

Our best Alaska Airlines deals on London to Ontario flight tickets

Alaska Airlines

15 Jun

LHR17:00London Heathrow

31h 30m

1 stop

ONT16:30Ontario

29 Jun

ONT21:20Ontario

33h 45m

1 stop

LHR15:05London Heathrow

€654

Alaska Airlines

28 Oct

LHR14:45London Heathrow

15h 57m

1 stop

ONT23:42Ontario

12 Nov

ONT12:00Ontario

16h 20m

1 stop

LHR12:20London Heathrow

€656

Alaska Airlines

7 Jun

LHR17:00London Heathrow

14h 58m

1 stop

ONT23:58Ontario

22 Nov

ONT06:00Ontario

22h 20m

1 stop

LHR12:20London Heathrow

€664

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 3/9

11:00-18:15

1 stop15h 15m

Ontario

Tue 3/11

14:59-12:00

1 stop13h 01m

€547

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 28/10

15:00-23:06

1 stop15h 06m

Ontario

Sat 7/11

14:59-12:00

1 stop13h 01m

€547

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 4/9

08:55-18:47

1 stop17h 52m

Ontario

Tue 8/9

14:27-14:25

1 stop15h 58m

€565

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

15:00-22:34

1 stop15h 34m

Ontario

Wed 22/7

10:25-09:00

1 stop14h 35m

€566

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/7

13:25-21:50

1 stop16h 25m

Ontario

Wed 22/7

18:01-15:35

1 stop13h 34m

€598

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 2/11

14:25-21:59

1 stop15h 34m

Ontario

Mon 9/11

14:59-12:00

1 stop13h 01m

€607

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 2/11

14:25-21:59

1 stop15h 34m

Ontario

Wed 25/11

16:47-13:15

1 stop12h 28m

€608

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 29/8

10:55-16:24

1 stop13h 29m

Ontario

Mon 14/9

13:00-10:00

1 stop13h 00m

€609

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 21/8

14:25-09:34

1 stop27h 09m

Ontario

Sat 29/8

12:33-12:50

1 stop16h 17m

€611

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/7

11:45-23:48

2 stops20h 03m

Ontario

Mon 20/7

13:00-10:00

1 stop13h 00m

€612

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 €565 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	14h 11m
Direct flights	None

The fastest flight from London to Ontario takes 14h 11m

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 14h 11m 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.