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

Alaska Airlines, 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.

€426 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 €967 to €677. The lowest price recently found on this route was €483.

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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.

06:55 - 20:42

LHR

ONT

21h 47m

2 stops

05:45 - 20:40

ONT

LHR

30h 55m

2 stops

€483United Airlines

Thu, 9 Jul - Fri, 17 Jul

06:55 - 18:11

LHR

ONT

19h 16m

2 stops

05:00 - 09:40

ONT

LHR

20h 40m

1 stop

€484United Airlines

Mon, 7 Sep - Mon, 28 Sep

07:30 - 20:20

LHR

ONT

20h 50m

2 stops

06:00 - 07:25

ONT

LHR

17h 25m

1 stop

€485United Airlines

Fri, 13 Nov - Tue, 17 Nov

07:30 - 20:20

LHR

ONT

20h 50m

2 stops

06:00 - 07:25

ONT

LHR

17h 25m

1 stop

€486United Airlines

Fri, 13 Nov - Tue, 17 Nov

10:35 - 17:54

LHR

ONT

15h 19m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€512United Airlines

Thu, 2 Jul - Thu, 6 Aug

14:50 - 20:58

LHR

ONT

14h 08m

1 stop

05:00 - 09:10

ONT

LHR

20h 10m

2 stops

€512United Airlines

Fri, 23 Oct - Thu, 5 Nov

13:40 - 21:55

LHR

ONT

16h 15m

1 stop

13:18 - 12:25

ONT

LHR

15h 07m

1 stop

€513United Airlines

Thu, 2 Jul - Tue, 4 Aug

14:50 - 20:58

LHR

ONT

14h 08m

1 stop

13:24 - 09:40

ONT

LHR

12h 16m

1 stop

€519United Airlines

Fri, 2 Oct - Thu, 15 Oct

08:30 - 22:51

LHR

ONT

22h 21m

2 stops

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€520United Airlines

Thu, 2 Jul - Sun, 5 Jul

14:45 - 22:23

LHR

ONT

15h 38m

1 stop

14:59 - 12:00

ONT

LHR

13h 01m

1 stop

€545British Airways

Sat, 7 Nov - Sat, 14 Nov

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Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

1 Jul

LHR08:40London Heathrow

22h 01m

2 stops

ONT22:41Ontario

30 Jul

ONT06:20Ontario

25h 15m

1 stop

LHR15:35London Heathrow

€564

Delta

4 Aug

LHR17:45London Heathrow

25h 31m

1 stop

ONT11:16Ontario

14 Aug

ONT18:01Ontario

13h 34m

1 stop

LHR15:35London Heathrow

€601

Delta

29 Jun

LHR11:40London Heathrow

19h 01m

1 stop

ONT22:41Ontario

7 Aug

ONT13:06Ontario

12h 54m

1 stop

LHR10:00London Heathrow

€604

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

16 Sept

LHR10:55London Heathrow

13h 38m

1 stop

ONT16:33Ontario

25 Sept

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

€570

KLM

13 Aug

LHR10:55London Heathrow

13h 29m

1 stop

ONT16:24Ontario

22 Aug

ONT13:06Ontario

12h 54m

1 stop

LHR10:00London Heathrow

€576

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/7

06:55-20:42

2 stops21h 47m

Ontario

Fri 17/7

05:45-20:40

2 stops30h 55m

€483

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 7/9

06:55-18:11

2 stops19h 16m

Ontario

Mon 28/9

05:00-09:40

1 stop20h 40m

€484

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 13/11

07:30-20:20

2 stops20h 50m

Ontario

Tue 17/11

06:00-07:25

1 stop17h 25m

€485

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 13/11

07:30-20:20

2 stops20h 50m

Ontario

Tue 17/11

06:00-07:25

1 stop17h 25m

€486

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/7

10:35-17:54

1 stop15h 19m

Ontario

Thu 6/8

13:18-09:40

1 stop12h 22m

€512

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 23/10

14:50-20:58

1 stop14h 08m

Ontario

Thu 5/11

05:00-09:10

2 stops20h 10m

€512

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/7

13:40-21:55

1 stop16h 15m

Ontario

Tue 4/8

13:18-12:25

1 stop15h 07m

€513

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 2/10

14:50-20:58

1 stop14h 08m

Ontario

Thu 15/10

13:24-09:40

1 stop12h 16m

€519

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/7

08:30-22:51

2 stops22h 21m

Ontario

Sun 5/7

13:18-09:40

1 stop12h 22m

€520

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/11

14:45-22:23

1 stop15h 38m

Ontario

Sat 14/11

14:59-12:00

1 stop13h 01m

€545

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 €361.

How far in advance should I book a flight from London 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 €575 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 €429 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	13h 52m
Direct flights	None

The fastest flight from London to Ontario takes 13h 52m

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 13h 52m 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.