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

United Airlines, British Airways, and Alaska 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.

€369 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 €467 to €593. The lowest price recently found on this route was €455.

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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.

12:05 - 22:36

LHR

ONT

17h 31m

1 stop

13:27 - 11:10

ONT

LHR

13h 43m

1 stop

€455United Airlines

Wed, 25 Mar - Wed, 1 Apr

10:15 - 18:42

LHR

ONT

15h 27m

1 stop

15:19 - 11:40

ONT

LHR

13h 21m

1 stop

€459British Airways

Thu, 12 Mar - Tue, 17 Mar

10:15 - 18:42

LHR

ONT

15h 27m

1 stop

10:56 - 06:50

ONT

LHR

12h 54m

1 stop

€461British Airways

Thu, 12 Mar - Wed, 18 Mar

16:25 - 23:59

LHR

ONT

15h 34m

1 stop

12:19 - 10:50

ONT

LHR

14h 31m

1 stop

€465British Airways

Wed, 1 Apr - Thu, 9 Apr

14:25 - 22:30

LHR

ONT

16h 05m

1 stop

14:08 - 12:10

ONT

LHR

14h 02m

1 stop

€467British Airways

Wed, 1 Apr - Thu, 16 Apr

10:05 - 21:59

LHR

ONT

19h 54m

1 stop

23:59 - 14:25

ONT

LHR

30h 26m

1 stop

€469British Airways

Mon, 27 Apr - Sat, 9 May

14:25 - 22:30

LHR

ONT

16h 05m

1 stop

14:08 - 12:10

ONT

LHR

14h 02m

1 stop

€470British Airways

Mon, 6 Apr - Fri, 24 Apr

10:55 - 16:28

LHR

ONT

13h 33m

1 stop

17:55 - 15:35

ONT

LHR

13h 40m

1 stop

€471Delta

Tue, 31 Mar - Mon, 13 Apr

10:55 - 16:28

LHR

ONT

13h 33m

1 stop

13:29 - 11:00

ONT

LHR

13h 31m

1 stop

€472Delta

Tue, 31 Mar - Tue, 14 Apr

10:55 - 16:28

LHR

ONT

13h 33m

1 stop

17:53 - 15:35

ONT

LHR

13h 42m

1 stop

€474Delta

Tue, 31 Mar - Wed, 8 Apr

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

31 Mar

LHR10:55London Heathrow

13h 33m

1 stop

ONT16:28Ontario

13 Apr

ONT17:55Ontario

13h 40m

1 stop

LHR15:35London Heathrow

€471

Delta

31 Mar

LHR10:55London Heathrow

13h 33m

1 stop

ONT16:28Ontario

14 Apr

ONT13:29Ontario

13h 31m

1 stop

LHR11:00London Heathrow

€472

Delta

31 Mar

LHR10:55London Heathrow

13h 33m

1 stop

ONT16:28Ontario

8 Apr

ONT17:53Ontario

13h 42m

1 stop

LHR15:35London Heathrow

€474

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

10 Mar

LHR09:30London Heathrow

18h 20m

2 stops

ONT20:50Ontario

17 Mar

ONT13:50Ontario

12h 50m

1 stop

LHR09:40London Heathrow

€432

United Airlines

25 Mar

LHR12:05London Heathrow

17h 31m

1 stop

ONT22:36Ontario

1 Apr

ONT13:27Ontario

13h 43m

1 stop

LHR11:10London Heathrow

€455

United Airlines

8 Jul

LHR11:25London Heathrow

19h 12m

2 stops

ONT22:37Ontario

15 Jul

ONT13:18Ontario

12h 22m

1 stop

LHR09:40London Heathrow

€487

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

12:05-22:36

1 stop17h 31m

Ontario

Wed 1/4

13:27-11:10

1 stop13h 43m

€455

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 12/3

10:15-18:42

1 stop15h 27m

Ontario

Tue 17/3

15:19-11:40

1 stop13h 21m

€459

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 12/3

10:15-18:42

1 stop15h 27m

Ontario

Wed 18/3

10:56-06:50

1 stop12h 54m

€461

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

16:25-23:59

1 stop15h 34m

Ontario

Thu 9/4

12:19-10:50

1 stop14h 31m

€465

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

14:25-22:30

1 stop16h 05m

Ontario

Thu 16/4

14:08-12:10

1 stop14h 02m

€467

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

10:05-21:59

1 stop19h 54m

Ontario

Sat 9/5

23:59-14:25

1 stop30h 26m

€469

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 6/4

14:25-22:30

1 stop16h 05m

Ontario

Fri 24/4

14:08-12:10

1 stop14h 02m

€470

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 31/3

10:55-16:28

1 stop13h 33m

Ontario

Mon 13/4

17:55-15:35

1 stop13h 40m

€471

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 31/3

10:55-16:28

1 stop13h 33m

Ontario

Tue 14/4

13:29-11:00

1 stop13h 31m

€472

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 31/3

10:55-16:28

1 stop13h 33m

Ontario

Wed 8/4

17:53-15:35

1 stop13h 42m

€474

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 February to fly from London, when ticket prices are also cheap, with an average price of €472.

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 €572 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 €446 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	15h 29m
Direct flights	None

The fastest flight from London to Ontario takes 15h 29m

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 15h 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.