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.

€405 Cheap Flights from London to Ontario in 2026

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.

09:00 - 17:47

LHR

ONT

40h 47m

2 stops

05:00 - 09:40

ONT

LHR

20h 40m

1 stop

€515United Airlines

Fri, 11 Dec - Mon, 4 Jan

09:30 - 20:20

LHR

ONT

18h 50m

2 stops

06:00 - 07:25

ONT

LHR

17h 25m

1 stop

€519United Airlines

Fri, 11 Dec - Thu, 31 Dec

07:30 - 20:20

LHR

ONT

20h 50m

2 stops

05:45 - 08:25

ONT

LHR

18h 40m

2 stops

€520United Airlines

Fri, 11 Dec - Thu, 31 Dec

09:00 - 20:15

LHR

ONT

19h 15m

2 stops

06:00 - 07:40

ONT

LHR

17h 40m

1 stop

€522United Airlines

Wed, 18 Nov - Thu, 19 Nov

09:00 - 20:15

LHR

ONT

19h 15m

2 stops

13:29 - 21:20

ONT

LHR

23h 51m

2 stops

€524United Airlines

Wed, 18 Nov - Thu, 19 Nov

08:40 - 20:01

LHR

ONT

19h 21m

2 stops

13:56 - 14:10

ONT

LHR

16h 14m

1 stop

€525United Airlines

Wed, 16 Sep - Mon, 21 Sep

08:45 - 20:01

LHR

ONT

19h 16m

2 stops

07:00 - 06:55

ONT

LHR

15h 55m

2 stops

€525United Airlines

Sat, 29 Aug - Sat, 5 Sep

08:40 - 20:01

LHR

ONT

19h 21m

2 stops

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€527United Airlines

Fri, 28 Aug - Fri, 4 Sep

07:25 - 22:59

LHR

ONT

23h 34m

2 stops

13:18 - 12:25

ONT

LHR

15h 07m

1 stop

€528United Airlines

Sat, 12 Sep - Sat, 19 Sep

08:40 - 20:01

LHR

ONT

19h 21m

2 stops

13:18 - 12:35

ONT

LHR

15h 17m

1 stop

€529United Airlines

Wed, 2 Sep - Sun, 13 Sep

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

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

11 Dec

LHR09:00London Heathrow

40h 47m

2 stops

ONT17:47Ontario

5 Jan

ONT18:53Ontario

17h 42m

2 stops

LHR20:35London Heathrow

€515

United Airlines

11 Dec

LHR09:30London Heathrow

18h 50m

2 stops

ONT20:20Ontario

31 Dec

ONT06:00Ontario

17h 25m

1 stop

LHR07:25London Heathrow

€519

United Airlines

11 Dec

LHR07:30London Heathrow

20h 50m

2 stops

ONT20:20Ontario

31 Dec

ONT05:45Ontario

18h 40m

2 stops

LHR08:25London Heathrow

€520

Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

30 Sept

LHR11:45London Heathrow

20h 02m

2 stops

ONT23:47Ontario

5 Oct

ONT17:15Ontario

18h 55m

2 stops

LHR20:10London Heathrow

€576

Delta

10 Dec

LHR12:20London Heathrow

18h 40m

1 stop

ONT23:00Ontario

1 Jan

ONT11:55Ontario

14h 45m

1 stop

LHR10:40London Heathrow

€579

Delta

30 Aug

LHR08:40London Heathrow

21h 12m

2 stops

ONT21:52Ontario

12 Sept

ONT13:04Ontario

16h 01m

2 stops

LHR13:05London Heathrow

€581

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/12

09:00-17:47

2 stops40h 47m

Ontario

Mon 4/1

05:00-09:40

1 stop20h 40m

€515

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/12

09:30-20:20

2 stops18h 50m

Ontario

Thu 31/12

06:00-07:25

1 stop17h 25m

€519

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 11/12

07:30-20:20

2 stops20h 50m

Ontario

Thu 31/12

05:45-08:25

2 stops18h 40m

€520

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/11

09:00-20:15

2 stops19h 15m

Ontario

Thu 19/11

06:00-07:40

1 stop17h 40m

€522

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/11

09:00-20:15

2 stops19h 15m

Ontario

Thu 19/11

13:29-21:20

2 stops23h 51m

€524

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 16/9

08:40-20:01

2 stops19h 21m

Ontario

Mon 21/9

13:56-14:10

1 stop16h 14m

€525

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 29/8

08:45-20:01

2 stops19h 16m

Ontario

Sat 5/9

07:00-06:55

2 stops15h 55m

€525

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 28/8

08:40-20:01

2 stops19h 21m

Ontario

Fri 4/9

13:18-09:40

1 stop12h 22m

€527

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 12/9

07:25-22:59

2 stops23h 34m

Ontario

Sat 19/9

13:18-12:25

1 stop15h 07m

€528

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 2/9

08:40-20:01

2 stops19h 21m

Ontario

Sun 13/9

13:18-12:35

1 stop15h 17m

€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?

Prices are currently typical for flights on this route.

Typical prices usually range from €467 to €644.
The lowest price recently found on this route was €515.

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 €495.

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	27h 05m
Direct flights	None

The fastest flight from London to Ontario takes 27h 05m

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 27h 05m 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.