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

British Airways and United 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.

€354 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 €596 to €713. The lowest price recently found on this route was €542.

1 adult

0 bags

Voted the Winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

07:30 - 20:58

LHR

ONT

21h 28m2 stops

05:05 - 05:55

ONT

LHR

16h 50m2 stops

€542United Airlines

Tue, 13 Jan - Tue, 20 Jan

06:30 - 22:37

LHR

ONT

24h 07m2 stops

07:30 - 10:30

ONT

LHR

19h 00m1 stop

€559Delta

Fri, 20 Feb - Sun, 22 Feb

11:20 - 17:13

LHR

ONT

13h 53m1 stop

11:59 - 09:00

ONT

LHR

13h 01m1 stop

€565Delta

Sun, 29 Mar - Sun, 5 Apr

10:05 - 17:43

LHR

ONT

15h 38m1 stop

13:00 - 09:40

ONT

LHR

12h 40m1 stop

€568United Airlines

Mon, 19 Jan - Mon, 5 Oct

06:30 - 21:05

LHR

ONT

22h 35m2 stops

06:00 - 10:30

ONT

LHR

20h 30m2 stops

€571Delta

Fri, 20 Feb - Sun, 22 Feb

12:20 - 22:37

LHR

ONT

18h 17m1 stop

07:30 - 10:30

ONT

LHR

19h 00m1 stop

€572Virgin Atlantic

Fri, 20 Feb - Sun, 22 Feb

13:45 - 22:53

LHR

ONT

17h 08m1 stop

13:53 - 07:25

ONT

LHR

33h 32m1 stop

€577United Airlines

Mon, 12 Jan - Sun, 18 Jan

13:05 - 21:04

LHR

ONT

15h 59m1 stop

13:20 - 09:50

ONT

LHR

12h 30m1 stop

€580Delta

Wed, 1 Apr - Tue, 7 Apr

10:55 - 16:14

LHR

ONT

13h 19m1 stop

13:00 - 09:50

ONT

LHR

12h 50m1 stop

€582KLM

Tue, 14 Apr - Wed, 22 Apr

20:25 - 16:12

LHR

ONT

27h 47m2 stops

07:30 - 10:40

ONT

LHR

19h 10m2 stops

€583Virgin Atlantic

Mon, 12 Jan - Sun, 18 Jan

British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

7 Feb

LHR10:35London Heathrow

16h 10m

1 stop

ONT18:45Ontario

14 Feb

ONT17:06Ontario

12h 09m

1 stop

LHR13:15London Heathrow

€588

Find similar

British Airways

29 Jan

LHR11:55London Heathrow

18h 53m

1 stop

ONT22:48Ontario

2 Feb

ONT10:58Ontario

15h 02m

1 stop

LHR10:00London Heathrow

€594

Find similar

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

13 Jan

LHR07:30London Heathrow

21h 28m

2 stops

ONT20:58Ontario

20 Jan

ONT05:05Ontario

16h 50m

2 stops

LHR05:55London Heathrow

€542

Find similar

United Airlines

19 Jan

LHR10:05London Heathrow

15h 38m

1 stop

ONT17:43Ontario

6 Oct

ONT13:00Ontario

12h 40m

1 stop

LHR09:40London Heathrow

€568

Find similar

United Airlines

12 Jan

LHR10:05London Heathrow

15h 38m

1 stop

ONT17:43Ontario

18 Jan

ONT13:53Ontario

35h 47m

2 stops

LHR09:40London Heathrow

€577

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 13/1

07:30-20:58

2 stops21h 28m

Ontario

Tue 20/1

05:05-05:55

2 stops16h 50m

€542

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/2

06:30-22:37

2 stops24h 07m

Ontario

Sun 22/2

07:30-10:30

1 stop19h 00m

€559

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 29/3

11:20-17:13

1 stop13h 53m

Ontario

Sun 5/4

11:59-09:00

1 stop13h 01m

€565

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 19/1

10:05-17:43

1 stop15h 38m

Ontario

Mon 5/10

13:00-09:40

1 stop12h 40m

€568

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/2

06:30-21:05

2 stops22h 35m

Ontario

Sun 22/2

06:00-10:30

2 stops20h 30m

€571

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/2

12:20-22:37

1 stop18h 17m

Ontario

Sun 22/2

07:30-10:30

1 stop19h 00m

€572

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 12/1

13:45-22:53

1 stop17h 08m

Ontario

Sun 18/1

13:53-07:25

1 stop33h 32m

€577

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

13:05-21:04

1 stop15h 59m

Ontario

Tue 7/4

13:20-09:50

1 stop12h 30m

€580

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 14/4

10:55-16:14

1 stop13h 19m

Ontario

Wed 22/4

13:00-09:50

1 stop12h 50m

€582

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 12/1

20:25-16:12

2 stops27h 47m

Ontario

Sun 18/1

07:30-10:40

2 stops19h 10m

€583

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 €469.

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 €610 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 €449 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	16h 10m
Direct flights	None

The fastest flight from London to Ontario takes 16h 10m

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 16h 10m 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.