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

British Airways, United Airlines, and Virgin Atlantic 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.

€358 Cheap Flights from London to Ontario in 2025/26

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 €497 to €646. The lowest price recently found on this route was €439.

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Find the cheapest flights from London to Los Angeles

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Enter your travel dates to find the best prices.

06:30 - 15:20LHR-ONT

16h 50m2 stops

13:00 - 10:00ONT-LHR

14h 00m1 stop

€439Delta

Find Deal

Mon, 2 Mar - Fri, 13 Mar

10:45 - 19:39LHR-ONT

16h 54m1 stop

13:15 - 10:00ONT-LHR

12h 45m1 stop

€448Delta

Find Deal

Thu, 18 Dec - Tue, 30 Dec

12:20 - 22:38LHR-ONT

18h 18m1 stop

13:00 - 11:40ONT-LHR

14h 40m1 stop

€453Delta

Find Deal

Sat, 24 Jan - Fri, 30 Jan

10:45 - 16:19LHR-ONT

13h 34m1 stop

06:45 - 10:30ONT-LHR

19h 45m1 stop

€480Virgin Atlantic

Find Deal

Thu, 26 Feb - Mon, 2 Mar

10:55 - 16:19LHR-ONT

13h 24m1 stop

13:00 - 09:50ONT-LHR

12h 50m1 stop

€487KLM

Find Deal

Thu, 2 Apr - Mon, 13 Apr

10:45 - 16:19LHR-ONT

13h 34m1 stop

13:00 - 09:00ONT-LHR

13h 00m1 stop

€533Multiple Airlines

Find Deal

Tue, 3 Mar - Tue, 10 Mar

10:55 - 16:19LHR-ONT

13h 24m1 stop

13:00 - 09:50ONT-LHR

12h 50m1 stop

€546KLM

Find Deal

Thu, 2 Apr - Wed, 15 Apr

18:00 - 22:31LHR-ONT

36h 31m2 stops

13:33 - 09:40ONT-LHR

12h 07m1 stop

€555United Airlines

Find Deal

Wed, 5 Nov - Wed, 12 Nov

10:30 - 17:34LHR-ONT

39h 04m2 stops

18:38 - 07:25ONT-LHR

28h 47m1 stop

€555United Airlines

Find Deal

Sun, 16 Nov - Sun, 23 Nov

10:45 - 16:19LHR-ONT

13h 34m1 stop

13:00 - 09:00ONT-LHR

13h 00m1 stop

€567Multiple Airlines

Find Deal

Wed, 4 Mar - Sat, 14 Mar

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

2 Mar

LHR06:30London Heathrow

16h 50m

2 stops

ONT15:20Ontario

13 Mar

ONT13:00Ontario

14h 00m

1 stop

LHR10:00London Heathrow

€439

Find similar

Delta

18 Dec

LHR10:45London Heathrow

16h 54m

1 stop

ONT19:39Ontario

30 Dec

ONT13:15Ontario

12h 45m

1 stop

LHR10:00London Heathrow

€448

Find similar

Delta

24 Jan

LHR12:20London Heathrow

18h 18m

1 stop

ONT22:38Ontario

30 Jan

ONT13:00Ontario

14h 40m

1 stop

LHR11:40London Heathrow

€453

Find similar

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

2 Apr

LHR10:55London Heathrow

13h 24m

1 stop

ONT16:19Ontario

13 Apr

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

€487

Find similar

KLM

2 Apr

LHR10:55London Heathrow

13h 24m

1 stop

ONT16:19Ontario

15 Apr

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

€546

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 2/3

06:30-15:20

2 stops16h 50m

Ontario

Fri 13/3

13:00-10:00

1 stop14h 00m

€439

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 18/12

10:45-19:39

1 stop16h 54m

Ontario

Tue 30/12

13:15-10:00

1 stop12h 45m

€448

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 24/1

12:20-22:38

1 stop18h 18m

Ontario

Fri 30/1

13:00-11:40

1 stop14h 40m

€453

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

10:45-16:19

1 stop13h 34m

Ontario

Mon 2/3

06:45-10:30

1 stop19h 45m

€480

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/4

10:55-16:19

1 stop13h 24m

Ontario

Mon 13/4

13:00-09:50

1 stop12h 50m

€487

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/3

10:45-16:19

1 stop13h 34m

Ontario

Tue 10/3

13:00-09:00

1 stop13h 00m

€533

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/4

10:55-16:19

1 stop13h 24m

Ontario

Wed 15/4

13:00-09:50

1 stop12h 50m

€546

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/11

18:00-22:31

2 stops36h 31m

Ontario

Wed 12/11

13:33-09:40

1 stop12h 07m

€555

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 16/11

10:30-17:34

2 stops39h 04m

Ontario

Sun 23/11

18:38-07:25

1 stop28h 47m

€555

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/3

10:45-16:19

1 stop13h 34m

Ontario

Sat 14/3

13:00-09:00

1 stop13h 00m

€567

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 September, then you should wait until January to fly from London, when ticket prices are also cheap, with an average price of €477.

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 €615 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 €465 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 24m 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.