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

United Airlines and JetBlue 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.

€428 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 €744 to €471. The lowest price recently found on this route was €502.

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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.

09:30 - 21:58

LHR

ONT

20h 28m

2 stops

05:00 - 07:15

ONT

LHR

18h 15m

2 stops

€502United Airlines

Tue, 5 May - Tue, 19 May

13:40 - 21:55

LHR

ONT

16h 15m

1 stop

13:44 - 11:10

ONT

LHR

13h 26m

1 stop

€514United Airlines

Tue, 4 Aug - Tue, 18 Aug

14:50 - 20:36

LHR

ONT

13h 46m

1 stop

13:34 - 12:25

ONT

LHR

14h 51m

1 stop

€515United Airlines

Mon, 13 Apr - Mon, 27 Apr

13:40 - 21:55

LHR

ONT

16h 15m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€516United Airlines

Mon, 13 Jul - Thu, 27 Aug

14:50 - 20:36

LHR

ONT

13h 46m

1 stop

13:34 - 12:25

ONT

LHR

14h 51m

1 stop

€517United Airlines

Mon, 13 Apr - Mon, 27 Apr

14:50 - 20:36

LHR

ONT

13h 46m

1 stop

13:34 - 12:25

ONT

LHR

14h 51m

1 stop

€518United Airlines

Mon, 13 Apr - Mon, 27 Apr

09:30 - 21:50

LHR

ONT

20h 20m

2 stops

13:30 - 11:10

ONT

LHR

13h 40m

1 stop

€522United Airlines

Mon, 27 Apr - Sat, 9 May

09:30 - 21:50

LHR

ONT

20h 20m

2 stops

10:43 - 14:10

ONT

LHR

19h 27m

1 stop

€524United Airlines

Mon, 27 Apr - Sat, 9 May

14:50 - 20:36

LHR

ONT

13h 46m

1 stop

13:34 - 12:25

ONT

LHR

14h 51m

1 stop

€525United Airlines

Mon, 13 Apr - Mon, 27 Apr

10:35 - 17:52

LHR

ONT

15h 17m

1 stop

05:00 - 07:15

ONT

LHR

18h 15m

2 stops

€529United Airlines

Tue, 5 May - Tue, 19 May

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

5 May

LHR09:30London Heathrow

20h 28m

2 stops

ONT21:58Ontario

19 May

ONT05:00Ontario

18h 15m

2 stops

LHR07:15London Heathrow

€502

United Airlines

4 Aug

LHR13:40London Heathrow

16h 15m

1 stop

ONT21:55Ontario

18 Aug

ONT13:44Ontario

13h 26m

1 stop

LHR11:10London Heathrow

€514

United Airlines

13 Apr

LHR14:50London Heathrow

13h 46m

1 stop

ONT20:36Ontario

27 Apr

ONT13:34Ontario

14h 51m

1 stop

LHR12:25London Heathrow

€515

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

5 May

LHR06:30London Heathrow

20h 03m

2 stops

ONT18:33Ontario

19 May

ONT11:52Ontario

19h 43m

1 stop

LHR15:35London Heathrow

€619

Delta

14 Sept

LHR06:30London Heathrow

19h 31m

2 stops

ONT18:01Ontario

22 Sept

ONT11:55Ontario

19h 40m

1 stop

LHR15:35London Heathrow

€621

Delta

5 May

LHR06:30London Heathrow

18h 45m

2 stops

ONT17:15Ontario

19 May

ONT13:35Ontario

18h 00m

1 stop

LHR15:35London Heathrow

€624

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 5/5

09:30-21:58

2 stops20h 28m

Ontario

Tue 19/5

05:00-07:15

2 stops18h 15m

€502

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/8

13:40-21:55

1 stop16h 15m

Ontario

Tue 18/8

13:44-11:10

1 stop13h 26m

€514

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:36

1 stop13h 46m

Ontario

Mon 27/4

13:34-12:25

1 stop14h 51m

€515

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/7

13:40-21:55

1 stop16h 15m

Ontario

Thu 27/8

13:18-09:40

1 stop12h 22m

€516

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:36

1 stop13h 46m

Ontario

Mon 27/4

13:34-12:25

1 stop14h 51m

€517

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:36

1 stop13h 46m

Ontario

Mon 27/4

13:34-12:25

1 stop14h 51m

€518

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

13:30-11:10

1 stop13h 40m

€522

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

10:43-14:10

1 stop19h 27m

€524

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 13/4

14:50-20:36

1 stop13h 46m

Ontario

Mon 27/4

13:34-12:25

1 stop14h 51m

€525

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 5/5

10:35-17:52

1 stop15h 17m

Ontario

Tue 19/5

05:00-07:15

2 stops18h 15m

€529

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 €481.

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 €596 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 €428 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 17m
Direct flights	None

The fastest flight from London to Ontario takes 14h 17m

There are no direct flights from London to Ontario. There are no popular flight routes from London to Ontario.

Search flight deals

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 17m 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.