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

British Airways, JetBlue, 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.

€419 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 €599 to €678. The lowest price recently found on this route was €566.

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Find the cheapest flights from London to Los Angeles

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

11:45 - 22:40

LHR

ONT

18h 55m

2 stops

13:04 - 10:00

ONT

LHR

12h 56m

1 stop

€566Virgin Atlantic

Thu, 17 Sep - Sat, 26 Sep

06:30 - 22:40

LHR

ONT

24h 10m

2 stops

13:04 - 15:35

ONT

LHR

18h 31m

2 stops

€571Virgin Atlantic

Fri, 18 Sep - Tue, 29 Sep

09:20 - 18:09

LHR

ONT

16h 49m

1 stop

17:52 - 15:35

ONT

LHR

13h 43m

1 stop

€578Delta

Fri, 25 Sep - Fri, 9 Oct

17:45 - 11:14

LHR

ONT

25h 29m

1 stop

17:52 - 15:35

ONT

LHR

13h 43m

1 stop

€579Delta

Thu, 24 Sep - Sat, 10 Oct

12:20 - 22:43

LHR

ONT

18h 23m

1 stop

12:00 - 09:00

ONT

LHR

13h 00m

1 stop

€581Delta

Fri, 11 Dec - Wed, 6 Jan

10:55 - 16:35

LHR

ONT

13h 40m

1 stop

13:04 - 10:00

ONT

LHR

12h 56m

1 stop

€584KLM

Tue, 22 Sep - Fri, 2 Oct

12:30 - 20:18

LHR

ONT

15h 48m

1 stop

12:00 - 09:00

ONT

LHR

13h 00m

1 stop

€585Multiple Airlines

Tue, 3 Nov - Thu, 12 Nov

12:30 - 20:18

LHR

ONT

15h 48m

1 stop

12:00 - 09:00

ONT

LHR

13h 00m

1 stop

€586Multiple Airlines

Tue, 3 Nov - Tue, 10 Nov

10:55 - 16:35

LHR

ONT

13h 40m

1 stop

18:00 - 15:35

ONT

LHR

13h 35m

1 stop

€587Delta

Wed, 9 Sep - Fri, 18 Sep

11:40 - 22:40

LHR

ONT

19h 00m

1 stop

18:00 - 15:35

ONT

LHR

13h 35m

1 stop

€587Virgin Atlantic

Fri, 18 Sep - Tue, 29 Sep

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Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

25 Sept

LHR09:20London Heathrow

16h 49m

1 stop

ONT18:09Ontario

9 Oct

ONT17:52Ontario

13h 43m

1 stop

LHR15:35London Heathrow

€578

Delta

24 Sept

LHR17:45London Heathrow

25h 29m

1 stop

ONT11:14Ontario

10 Oct

ONT17:52Ontario

13h 43m

1 stop

LHR15:35London Heathrow

€579

Delta

11 Dec

LHR12:20London Heathrow

18h 23m

1 stop

ONT22:43Ontario

6 Jan

ONT12:00Ontario

13h 00m

1 stop

LHR09:00London Heathrow

€581

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

22 Sept

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

2 Oct

ONT13:04Ontario

12h 56m

1 stop

LHR10:00London Heathrow

€584

KLM

15 Sept

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

28 Sept

ONT13:04Ontario

12h 56m

1 stop

LHR10:00London Heathrow

€588

KLM

15 Sept

LHR10:55London Heathrow

13h 40m

1 stop

ONT16:35Ontario

25 Sept

ONT13:04Ontario

12h 56m

1 stop

LHR10:00London Heathrow

€589

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 17/9

11:45-22:40

2 stops18h 55m

Ontario

Sat 26/9

13:04-10:00

1 stop12h 56m

€566

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 18/9

06:30-22:40

2 stops24h 10m

Ontario

Tue 29/9

13:04-15:35

2 stops18h 31m

€571

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 25/9

09:20-18:09

1 stop16h 49m

Ontario

Fri 9/10

17:52-15:35

1 stop13h 43m

€578

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 24/9

17:45-11:14

1 stop25h 29m

Ontario

Sat 10/10

17:52-15:35

1 stop13h 43m

€579

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/12

12:20-22:43

1 stop18h 23m

Ontario

Wed 6/1

12:00-09:00

1 stop13h 00m

€581

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 22/9

10:55-16:35

1 stop13h 40m

Ontario

Fri 2/10

13:04-10:00

1 stop12h 56m

€584

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/11

12:30-20:18

1 stop15h 48m

Ontario

Thu 12/11

12:00-09:00

1 stop13h 00m

€585

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/11

12:30-20:18

1 stop15h 48m

Ontario

Tue 10/11

12:00-09:00

1 stop13h 00m

€586

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/9

10:55-16:35

1 stop13h 40m

Ontario

Fri 18/9

18:00-15:35

1 stop13h 35m

€587

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 18/9

11:40-22:40

1 stop19h 00m

Ontario

Tue 29/9

18:00-15:35

1 stop13h 35m

€587

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 €365.

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.