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Cheap flights from Ontario to London Heathrow Airport from £199

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — LHR
1 Sep — 8 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Heathrow
Explore the most affordable flight options available from Ontario to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 August 2026.

Sun 6/918:25
YUL
-
LHR
1 stop22h 10m
Multiple Airlines
Tue 8/918:40
LHR
-
YUL
1 stop25h 20m
Multiple Airlines
Deal found 27/7£394
Thu 15/1018:35
YUL
-
LHR
1 stop32h 45m
Multiple Airlines
Sun 18/1006:00
LHR
-
YUL
1 stop14h 00m
Multiple Airlines
Deal found 1/8£397
Mon 16/1121:45
YUL
-
LHR
1 stop18h 50m
TAP AIR PORTUGAL
Sun 22/1112:25
LHR
-
YUL
1 stop12h 30m
TAP AIR PORTUGAL
Deal found 31/7£399
Wed 7/1022:45
YUL
-
LHR
1 stop11h 50m
TAP AIR PORTUGAL
Tue 13/1019:50
LHR
-
YUL
1 stop29h 55m
TAP AIR PORTUGAL
Deal found 29/7£402
Mon 28/922:55
YYZ
-
LHR
1 stop14h 55m
TAP AIR PORTUGAL
Thu 8/1006:00
LHR
-
YYZ
1 stop20h 25m
TAP AIR PORTUGAL
Deal found 29/7£404
Tue 15/923:55
YYZ
-
LHR
1 stop11h 05m
Multiple Airlines
Tue 22/907:40
LHR
-
YYZ
1 stop13h 10m
Multiple Airlines
Deal found 1/8£405
Mon 5/1022:55
YYZ
-
LHR
1 stop18h 05m
TAP AIR PORTUGAL
Thu 15/1016:35
LHR
-
YYZ
1 stop27h 25m
TAP AIR PORTUGAL
Deal found 31/7£406
Fri 25/917:35
YYZ
-
LHR
1 stop14h 10m
TAP AIR PORTUGAL
Thu 15/1019:50
LHR
-
YYZ
1 stop24h 10m
TAP AIR PORTUGAL
Deal found 29/7£406
Tue 8/909:45
YUL
-
LHR
1 stop21h 10m
United Airlines
Thu 10/911:05
LHR
-
YUL
2 stops49h 43m
United Airlines
Deal found 29/7£407
Sun 22/1119:40
YYZ
-
LHR
1 stop10h 10m
Icelandair
Thu 3/1212:15
LHR
-
YYZ
1 stop11h 00m
Icelandair
Deal found 28/7£408
Mon 21/923:55
YYZ
-
LHR
1 stop15h 25m
Multiple Airlines
Mon 28/908:50
LHR
-
YYZ
1 stop12h 00m
Multiple Airlines
Deal found 31/7£409
Fri 16/1017:35
YYZ
-
LHR
1 stop24h 20m
TAP AIR PORTUGAL
Fri 23/1006:00
LHR
-
YYZ
1 stop14h 00m
TAP AIR PORTUGAL
Deal found 29/7£409

Find flight deals from Ontario to Heathrow

Keep the following information in mind while searching for Ontario to Heathrow flight deals. Data was last updated 2 August 2026.

Round-trip from

£394

One-way from

£199

Popular in

December

Cheapest in

February

Average price

£614

Good round-trip deal

£506 or less

Good one-way deal

£342 or less
SWISS
  • SWISS
  • 6/9-8/9
  • 2 total stops
  • 47h 30m total
  • Ontario to London
Search Deals
7/10
  • 7/10
  • 2 total stops
  • 16h 40m total
  • Ontario to London
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Ontario to London Heathrow.
Search Deals
Price to beat on a one-way flight from Ontario to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Ontario to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 2 August 2026.
Use the filters below to find and compare flights from Ontario to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

TorontoLondon

YTZ - LHR

YTZLHR

Toronto Island

Wed 7/10

18:55-08:35

1 stop8h 40m

London Heathrow

Mon 23/11

09:00-21:35

2 stops17h 35m

£465

TorontoLondon

YTZ - LHR

YTZLHR

Toronto Island

Fri 4/9

09:30-06:30

1 stop16h 00m

London Heathrow

Thu 24/9

09:30-18:20

1 stop13h 50m

£468

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Thu 10/9

22:55-11:10

Nonstop7h 15m

London Heathrow

Thu 17/9

17:50-20:40

Nonstop7h 50m

£472

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Sun 4/10

22:55-11:10

Nonstop7h 15m

London Heathrow

Sat 21/11

11:30-19:45

1 stop13h 15m

£472

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Mon 12/10

15:10-10:00

1 stop13h 50m

London Heathrow

Sun 18/10

14:05-22:10

1 stop13h 05m

£479

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Sat 22/8

06:00-07:10

1 stop20h 10m

London Heathrow

Wed 2/9

06:30-16:55

1 stop15h 25m

£488

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 23/10

17:10-16:35

1 stop18h 25m

London Heathrow

Wed 28/10

08:55-16:00

1 stop11h 05m

£492

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Wed 21/10

19:00-10:30

1 stop10h 30m

London Heathrow

Thu 29/10

06:20-13:15

1 stop10h 55m

£492

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Mon 12/10

18:00-10:30

1 stop11h 30m

London Heathrow

Mon 26/10

08:55-20:45

1 stop15h 50m

£494

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Wed 12/8

18:00-10:00

1 stop11h 00m

London Heathrow

Thu 19/11

13:25-19:32

1 stop11h 07m

£499

Flights are sorted by cheapest return flights first.

Deals found on 29/7

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Ontario with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to London Heathrow Airport

What is the cheapest month to book a flight from Region of Ontario to London Heathrow Airport?

Currently, February is the cheapest month in which you can book a flight from Region of Ontario to London Heathrow Airport (average of £447). Flying from Region of Ontario to London Heathrow Airport in December is currently the most expensive (average of £707). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ON to LHR?

Find hourly flight availability from Ontario to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 2 August 2026.

When flying from Region of Ontario to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Region of Ontario to London Heathrow Airport

Explore weekly flight availability from Ontario to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 2 August 2026.

The most flights from CAON to LHR are scheduled on a Thursday (46 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (29 on average).

How much does it cost for a return flight from Region of Ontario to London Heathrow Airport?

Airfare is below average for this route at the moment.
Region of Ontario to London Heathrow Airport flights typically cost between £549 and £717 in September.
The cheapest return price found within the last 5 days was £404 on TAP AIR PORTUGAL (28 Sept–8 Oct).

How far ahead should I book a flight from Region of Ontario to London Heathrow Airport?

Booking 45 days in advance of your planned departure date is, on average, the best time to get cheap flights from Region of Ontario to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Region of Ontario to London Heathrow Airport?

    For as low as £472, Air Canada can have you in London Heathrow Airport from Region of Ontario in 7h 15m. Region of Ontario and London Heathrow Airport are separated by a distance of 3543 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Region of Ontario to London Heathrow Airport one-way?

    £168 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on Air Canada and United Airlines, with prices starting from £215 and £242, respectively.

  • What are the most popular routes from Region of Ontario to London Heathrow Airport?

    When deciding which route to take from Region of Ontario to London Heathrow Airport consider Toronto Pearson Intl - London Heathrow, Montreal Pierre Elliott Trudeau Intl - London Heathrow or Toronto Island - London Heathrow as they are the most popular.

  • What are the most reliable airlines from Region of Ontario to London Heathrow Airport?

    No one likes to see their flight delayed. When booking a flight from Region of Ontario to London Heathrow Airport consider choosing Singapore Airlines (87%), KLM (86%) or Air France (86%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Region of Ontario to London Heathrow Airport?

    Looking for the cheapest flight from Region of Ontario to London Heathrow Airport? While on average our users pay £1,055, our data indicates the cheapest price to be £174. The most popular route (Toronto Pearson Intl - London Heathrow), is priced around £390.

  • Can I find deals for flights from Ontario to Heathrow that include hotel bookings?

    Yes. In addition to deals on Ontario to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Heathrow.

  • Can I find deals for business class flights from Ontario to Heathrow?

    Yes. Cheapflights offers flight deals from Ontario to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Region of Ontario to London Heathrow Airport?

    Currently, February is the cheapest month in which you can book a flight from Region of Ontario to London Heathrow Airport (average of £447). Flying from Region of Ontario to London Heathrow Airport in December is currently the most expensive (average of £707). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Milton Keynes
Luton
Gatwick
Wembley
Slough
Ilford
Hayes
Croydon
Colchester
Brentford
Eastbourne
Northampton
Watford
Swindon
Southend-on-Sea
Enfield
Kingston upon Thames
Poole
Southall

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 8 airlines flying from Ontario to Heathrow

Discover the top 8 airlines that operate flights from Ontario to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 2 August 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£359Average£627FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
KLMCheapest£377Average£493FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£386Average£614FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£403Average£589FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£414Average£691FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
FinnairCheapest£418Average£509FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£419Average£577FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£469Average£570FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to Heathrow?

Cheapflights makes it easy to find Ontario to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Heathrow?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ontario to Heathrow for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Ontario to Heathrow with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ontario to Heathrow flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Ontario to Heathrow become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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