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Cheap flights from Ontario to London Heathrow Airport from £191

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 18/3. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — LHR
4 Mar — 11 Mar1
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 February 2026.

Wed 4/321:45
YUL
-
LHR
1 stop16h 10m
TAP AIR PORTUGAL
Wed 11/306:00
LHR
-
YUL
1 stop19h 15m
TAP AIR PORTUGAL
Deal found 1/2£356
Mon 2/321:45
YUL
-
LHR
1 stop14h 45m
TAP AIR PORTUGAL
Mon 16/308:15
LHR
-
YUL
1 stop17h 00m
TAP AIR PORTUGAL
Deal found 1/2£360
Mon 23/221:45
YUL
-
LHR
1 stop18h 50m
TAP AIR PORTUGAL
Wed 11/308:15
LHR
-
YUL
1 stop17h 00m
TAP AIR PORTUGAL
Deal found 31/1£366
Mon 2/321:45
YUL
-
LHR
1 stop14h 45m
TAP AIR PORTUGAL
Fri 13/312:25
LHR
-
YUL
1 stop12h 50m
TAP AIR PORTUGAL
Deal found 31/1£367
Mon 2/321:45
YUL
-
LHR
1 stop19h 55m
TAP AIR PORTUGAL
Sat 14/319:55
LHR
-
YUL
1 stop29h 20m
TAP AIR PORTUGAL
Deal found 2/2£370
Wed 25/322:45
YUL
-
LHR
1 stop12h 45m
TAP AIR PORTUGAL
Tue 5/519:50
LHR
-
YUL
1 stop29h 55m
TAP AIR PORTUGAL
Deal found 31/1£370
Mon 23/221:45
YUL
-
LHR
1 stop19h 55m
TAP AIR PORTUGAL
Tue 10/318:30
LHR
-
YUL
1 stop30h 45m
TAP AIR PORTUGAL
Deal found 31/1£371
Mon 2/321:45
YUL
-
LHR
1 stop14h 45m
TAP AIR PORTUGAL
Tue 10/318:30
LHR
-
YUL
1 stop30h 45m
TAP AIR PORTUGAL
Deal found 31/1£372
Sun 1/319:40
YYZ
-
LHR
1 stop10h 10m
Icelandair
Sun 8/320:35
LHR
-
YYZ
1 stop26h 40m
Icelandair
Deal found 1/2£374
Sun 1/319:40
YYZ
-
LHR
1 stop10h 10m
Icelandair
Thu 5/312:15
LHR
-
YYZ
1 stop11h 00m
Icelandair
Deal found 1/2£375
Sun 8/219:40
YYZ
-
LHR
1 stop10h 10m
Icelandair
Tue 24/220:35
LHR
-
YYZ
1 stop26h 40m
Icelandair
Deal found 1/2£375
Mon 23/219:40
YYZ
-
LHR
1 stop10h 10m
Icelandair
Tue 3/320:35
LHR
-
YYZ
1 stop26h 40m
Icelandair
Deal found 31/1£376

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 February 2026.

Round-trip from

£356

One-way from

£191

Popular in

December

Cheapest in

February

Average price

£376

Good round-trip deal

£415 or less

Good one-way deal

£263 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 4/3-11/3
  • 2 total stops
  • 35h 25m total
  • Ontario to London
Search Deals
18/3
  • 18/3
  • 1 total stop
  • 11h 45m total
  • Ontario to London
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£16 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 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 February 2026.
Use the filters below to find and compare flights from Ontario to London Heathrow Airport that are best for you.

Fly from

Ontario

Fly to

Heathrow

Route

Depart

Return

Price

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Thu 26/2

19:40-10:50

1 stop10h 10m

London Heathrow

Wed 4/3

20:35-18:15

1 stop26h 40m

£390

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Mon 13/4

20:45-11:55

1 stop10h 10m

London Heathrow

Fri 24/4

13:05-19:10

1 stop11h 05m

£401

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Mon 20/4

23:10-20:20

1 stop16h 10m

London Heathrow

Fri 1/5

21:25-19:10

1 stop26h 45m

£408

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Thu 14/5

23:10-20:20

1 stop16h 10m

London Heathrow

Tue 19/5

21:25-19:10

1 stop26h 45m

£416

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Sat 9/5

23:05-11:10

Nonstop7h 05m

London Heathrow

Thu 14/5

17:45-20:35

Nonstop7h 50m

£426

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Fri 24/4

23:05-11:10

Nonstop7h 05m

London Heathrow

Mon 27/4

17:45-20:35

Nonstop7h 50m

£426

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Thu 14/5

23:05-11:10

Nonstop7h 05m

London Heathrow

Sun 17/5

17:45-20:35

Nonstop7h 50m

£426

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Fri 24/4

23:05-11:10

Nonstop7h 05m

London Heathrow

Wed 29/4

17:45-20:35

Nonstop7h 50m

£426

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Sat 2/5

23:05-11:10

Nonstop7h 05m

London Heathrow

Sat 9/5

11:30-21:00

1 stop14h 30m

£426

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Tue 21/4

23:05-11:10

Nonstop7h 05m

London Heathrow

Tue 28/4

17:45-20:35

Nonstop7h 50m

£428

Flights are sorted by cheapest return flights first.

Deals found on 31/1

Showing 1-10 of 60 results
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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, March is the cheapest month in which you can book a flight from Region of Ontario to London Heathrow Airport (average of £352). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of £486). 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 February 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 February 2026.

The most flights from CAON to LHR are scheduled on a Friday (39 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (22 on average).

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 £426, Icelandair can have you in London Heathrow Airport from Region of Ontario in 7h 05m. 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?

    £165 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 £217 and £238, 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 American Airlines (56%), Aer Lingus (56%) or Finnair (56%) 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 £1,109, our data indicates the cheapest price to be £258. The most popular route (Toronto Pearson Intl - London Heathrow), is priced around £342.

  • 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, March is the cheapest month in which you can book a flight from Region of Ontario to London Heathrow Airport (average of £352). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of £486). 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
Milton Keynes
Croydon
Luton
Northampton
Wembley
Gatwick
Slough
Ilford
Hounslow
Brentford
Hayes
Colchester
Watford
Guildford
Swindon
Bedford
Chelmsford
Eastbourne
Crawley
Kingston upon Thames

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.

Alternative routes for Ontario to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to Heathrow flights
Pearson Intl to Gatwick flights
Vancouver Intl to Heathrow flights
Pierre Elliott Trudeau Intl to Heathrow flights
Pearson Intl to London City flights
Pearson Intl to Stansted flights
Vancouver Intl to Gatwick flights
Toronto Island to Heathrow flights
Pearson Intl to Luton flights
Calgary to Heathrow flights
Pierre Elliott Trudeau Intl to Gatwick flights
Vancouver Intl to Stansted flights
Halifax to Heathrow flights
Pierre Elliott Trudeau Intl to Stansted flights
Calgary to Gatwick flights
Ottawa to Heathrow flights
Calgary to London City flights
Halifax to Gatwick flights
Abbotsford to Heathrow flights
Vancouver Intl to Luton flights
Edmonton to Heathrow flights
Ottawa to Gatwick flights
Edmonton to Gatwick flights
Winnipeg to Gatwick flights
Winnipeg to Heathrow flights
Calgary to Stansted flights
Ottawa to Stansted flights
Québec City to Gatwick flights
Victoria to Gatwick flights
Victoria to Heathrow flights
St. John's to Gatwick flights
St. John's to Heathrow flights
Québec City to Heathrow flights

Top 10 airlines flying from Ontario to Heathrow

Discover the top 10 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 February 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£353Average£523FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£358Average£510FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Air CanadaCheapest£374Average£658FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
KLMCheapest£374Average£444FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£381Average£585FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£387Average£537FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£393Average£544FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£408Average£411FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£408Average£501FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£461Average£562FlexibilityNo 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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