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

United Airlines and British Airways 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.

€372 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 €425 to €487. The lowest price recently found on this route was €400.

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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.

08:30 - 22:57

LHR

ONT

22h 27m

2 stops

13:40 - 12:00

ONT

LHR

15h 20m

1 stop

€400United Airlines

Wed, 4 Mar - Wed, 11 Mar

09:30 - 21:50

LHR

ONT

20h 20m

2 stops

06:00 - 09:40

ONT

LHR

43h 40m

2 stops

€414United Airlines

Mon, 27 Apr - Sat, 9 May

10:05 - 17:41

LHR

ONT

15h 36m

1 stop

13:40 - 12:20

ONT

LHR

14h 40m

1 stop

€427United Airlines

Thu, 12 Feb - Sat, 9 May

10:05 - 17:41

LHR

ONT

15h 36m

1 stop

13:43 - 12:20

ONT

LHR

14h 37m

1 stop

€434United Airlines

Sun, 1 Mar - Fri, 17 Apr

16:15 - 22:45

LHR

ONT

14h 30m

1 stop

13:34 - 12:20

ONT

LHR

14h 46m

1 stop

€441United Airlines

Mon, 13 Apr - Thu, 23 Apr

14:30 - 22:34

LHR

ONT

15h 04m

1 stop

12:50 - 09:00

ONT

LHR

13h 10m

1 stop

€441Multiple Airlines

Tue, 17 Mar - Tue, 24 Mar

10:05 - 17:41

LHR

ONT

15h 36m

1 stop

13:50 - 12:00

ONT

LHR

14h 10m

1 stop

€442United Airlines

Fri, 13 Feb - Mon, 16 Feb

10:05 - 17:41

LHR

ONT

15h 36m

1 stop

13:50 - 12:00

ONT

LHR

14h 10m

1 stop

€443United Airlines

Fri, 13 Feb - Mon, 16 Feb

12:30 - 21:05

LHR

ONT

16h 35m

1 stop

13:11 - 10:00

ONT

LHR

12h 49m

1 stop

€444Delta

Fri, 6 Feb - Mon, 9 Feb

10:45 - 21:44

LHR

ONT

18h 59m

1 stop

13:10 - 10:00

ONT

LHR

12h 50m

1 stop

€446Delta

Sat, 14 Feb - Fri, 20 Feb

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

4 Mar

LHR08:30London Heathrow

22h 27m

2 stops

ONT22:57Ontario

11 Mar

ONT13:40Ontario

15h 20m

1 stop

LHR12:00London Heathrow

€400

United Airlines

27 Apr

LHR09:30London Heathrow

20h 20m

2 stops

ONT21:50Ontario

9 May

ONT06:00Ontario

43h 40m

2 stops

LHR09:40London Heathrow

€414

United Airlines

25 Jan

LHR11:35London Heathrow

17h 23m

1 stop

ONT20:58Ontario

7 Feb

ONT13:24Ontario

12h 16m

1 stop

LHR09:40London Heathrow

€426

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

1 Apr

LHR10:55London Heathrow

13h 33m

1 stop

ONT16:28Ontario

15 Apr

ONT13:20Ontario

12h 40m

1 stop

LHR10:00London Heathrow

€464

KLM

23 Mar

LHR14:30London Heathrow

15h 04m

1 stop

ONT22:34Ontario

8 Apr

ONT13:20Ontario

12h 40m

1 stop

LHR10:00London Heathrow

€545

KLM

16 Jul

LHR10:55London Heathrow

13h 19m

1 stop

ONT16:14Ontario

25 Jul

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

€554

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/3

08:30-22:57

2 stops22h 27m

Ontario

Wed 11/3

13:40-12:00

1 stop15h 20m

€400

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

06:00-09:40

2 stops43h 40m

€414

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 12/2

10:05-17:41

1 stop15h 36m

Ontario

Sat 9/5

13:40-12:20

1 stop14h 40m

€427

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/3

10:05-17:41

1 stop15h 36m

Ontario

Fri 17/4

13:43-12:20

1 stop14h 37m

€434

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

16:15-22:45

1 stop14h 30m

Ontario

Thu 23/4

13:34-12:20

1 stop14h 46m

€441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 17/3

14:30-22:34

1 stop15h 04m

Ontario

Tue 24/3

12:50-09:00

1 stop13h 10m

€441

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 13/2

10:05-17:41

1 stop15h 36m

Ontario

Mon 16/2

13:50-12:00

1 stop14h 10m

€442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 13/2

10:05-17:41

1 stop15h 36m

Ontario

Mon 16/2

13:50-12:00

1 stop14h 10m

€443

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 6/2

12:30-21:05

1 stop16h 35m

Ontario

Mon 9/2

13:11-10:00

1 stop12h 49m

€444

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 14/2

10:45-21:44

1 stop18h 59m

Ontario

Fri 20/2

13:10-10:00

1 stop12h 50m

€446

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 January, then you should wait until September 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 €587 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 €454 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 53m
Direct flights	None

The fastest flight from London to Ontario takes 15h 53m

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 53m 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.