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

Alaska Airlines, British Airways, 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.

€416 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 typical for flights on this route. Typical prices usually range from €498 to €641. The lowest price recently found on this route was €527.

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.

08:40 - 20:01

LHR

ONT

19h 21m

2 stops

05:00 - 12:35

ONT

LHR

23h 35m

1 stop

€527United Airlines

Wed, 9 Sep - Wed, 23 Sep

09:30 - 21:59

LHR

ONT

20h 29m

2 stops

05:00 - 09:20

ONT

LHR

20h 20m

2 stops

€527United Airlines

Thu, 17 Sep - Mon, 21 Sep

07:30 - 20:31

LHR

ONT

21h 01m

2 stops

16:03 - 14:10

ONT

LHR

14h 07m

1 stop

€528United Airlines

Fri, 25 Sep - Wed, 30 Sep

09:30 - 21:59

LHR

ONT

20h 29m

2 stops

13:56 - 11:10

ONT

LHR

13h 14m

1 stop

€530United Airlines

Thu, 17 Sep - Mon, 21 Sep

09:30 - 21:59

LHR

ONT

20h 29m

2 stops

13:56 - 11:10

ONT

LHR

13h 14m

1 stop

€531United Airlines

Thu, 17 Sep - Mon, 21 Sep

09:30 - 21:59

LHR

ONT

20h 29m

2 stops

13:56 - 11:10

ONT

LHR

13h 14m

1 stop

€532United Airlines

Thu, 17 Sep - Mon, 21 Sep

06:35 - 20:56

LHR

ONT

22h 21m

2 stops

06:00 - 07:40

ONT

LHR

17h 40m

1 stop

€542United Airlines

Wed, 18 Nov - Thu, 19 Nov

06:35 - 20:56

LHR

ONT

22h 21m

2 stops

06:00 - 10:15

ONT

LHR

20h 15m

1 stop

€543United Airlines

Wed, 18 Nov - Thu, 19 Nov

07:30 - 20:56

LHR

ONT

21h 26m

2 stops

06:00 - 10:15

ONT

LHR

20h 15m

1 stop

€546United Airlines

Wed, 18 Nov - Thu, 19 Nov

06:35 - 20:56

LHR

ONT

22h 21m

2 stops

05:00 - 08:30

ONT

LHR

19h 30m

2 stops

€549United Airlines

Wed, 18 Nov - Thu, 19 Nov

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British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

22 Nov

LHR13:15London Heathrow

13h 50m

1 stop

ONT19:05Ontario

15 Dec

ONT14:56Ontario

13h 19m

1 stop

LHR12:15London Heathrow

€594

British Airways

14 Oct

LHR16:10London Heathrow

13h 44m

1 stop

ONT21:54Ontario

20 Oct

ONT13:05Ontario

13h 25m

1 stop

LHR10:30London Heathrow

€598

British Airways

14 Aug

LHR11:00London Heathrow

15h 15m

1 stop

ONT18:15Ontario

27 Aug

ONT12:33Ontario

14h 22m

1 stop

LHR10:55London Heathrow

€601

Alaska Airlines flights from London to Ontario

Our best Alaska Airlines deals on London to Ontario flight tickets

Alaska Airlines

8 Sept

LHR17:00London Heathrow

26h 16m

1 stop

ONT11:16Ontario

20 Sept

ONT06:02Ontario

25h 03m

1 stop

LHR15:05London Heathrow

€600

Alaska Airlines

4 Aug

LHR17:00London Heathrow

14h 11m

1 stop

ONT23:11Ontario

16 Aug

ONT06:02Ontario

25h 03m

1 stop

LHR15:05London Heathrow

€804

Alaska Airlines

5 Aug

LHR17:00London Heathrow

14h 11m

1 stop

ONT23:11Ontario

16 Aug

ONT06:02Ontario

25h 03m

1 stop

LHR15:05London Heathrow

€860

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/9

08:40-20:01

2 stops19h 21m

Ontario

Wed 23/9

05:00-12:35

1 stop23h 35m

€527

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 17/9

09:30-21:59

2 stops20h 29m

Ontario

Mon 21/9

05:00-09:20

2 stops20h 20m

€527

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 25/9

07:30-20:31

2 stops21h 01m

Ontario

Wed 30/9

16:03-14:10

1 stop14h 07m

€528

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 17/9

09:30-21:59

2 stops20h 29m

Ontario

Mon 21/9

13:56-11:10

1 stop13h 14m

€530

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 17/9

09:30-21:59

2 stops20h 29m

Ontario

Mon 21/9

13:56-11:10

1 stop13h 14m

€531

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 17/9

09:30-21:59

2 stops20h 29m

Ontario

Mon 21/9

13:56-11:10

1 stop13h 14m

€532

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/11

06:35-20:56

2 stops22h 21m

Ontario

Thu 19/11

06:00-07:40

1 stop17h 40m

€542

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/11

06:35-20:56

2 stops22h 21m

Ontario

Thu 19/11

06:00-10:15

1 stop20h 15m

€543

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/11

07:30-20:56

2 stops21h 26m

Ontario

Thu 19/11

06:00-10:15

1 stop20h 15m

€546

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/11

06:35-20:56

2 stops22h 21m

Ontario

Thu 19/11

05:00-08:30

2 stops19h 30m

€549

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 €502.

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 03m
Direct flights	None

The fastest flight from London to Ontario takes 14h 03m

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 03m 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.