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Cheap flights from Ontario to London Heathrow Airport from £168

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 20/1. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — LHR
20 Nov — 27 Nov1
1 adult
1 adult, Economy

Cheap flight deals from Ontario to Heathrow

Keep the following information in mind while searching for Ontario to Heathrow flight deals. Data was last updated 21 October 2025.

Round-trip from

£389

One-way from

£168

Popular in

December

Cheapest in

February

Average price

£445

Good round-trip deal

£478 or less

Good one-way deal

£278 or less
Icelandair
  • Icelandair
  • 24/11-3/12
  • 2 total stops
  • 21h 10m total
  • Ontario to London
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WestJet
  • WestJet
  • 20/1
  • 1 total stop
  • 26h 05m total
  • Ontario to London
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£17 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£12 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Ontario to London Heathrow.
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Price to beat on a one-way flight from Ontario to London Heathrow.
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Find 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 21 October 2025.

Mon 24/1119:40YYZ - LHR
1 stop10h 10mIcelandair
Wed 3/1212:15LHR - YYZ
1 stop11h 00mIcelandair
Deal found 20/10£389
Wed 26/1119:40YYZ - LHR
1 stop10h 10mIcelandair
Sun 7/1220:35LHR - YYZ
1 stop26h 40mIcelandair
Deal found 20/10£390
Thu 4/1219:40YYZ - LHR
1 stop10h 10mIcelandair
Mon 8/1220:35LHR - YYZ
1 stop26h 40mIcelandair
Deal found 19/10£390
Mon 1/1219:40YYZ - LHR
1 stop18h 50mIcelandair
Mon 8/1220:35LHR - YYZ
1 stop26h 40mIcelandair
Deal found 20/10£391
Mon 1/1219:40YYZ - LHR
1 stop10h 10mIcelandair
Fri 5/1220:35LHR - YYZ
1 stop26h 40mIcelandair
Deal found 20/10£392
Mon 10/1119:40YYZ - LHR
1 stop10h 10mIcelandair
Wed 19/1112:15LHR - YYZ
1 stop11h 00mIcelandair
Deal found 19/10£393
Fri 5/1219:40YYZ - LHR
1 stop10h 10mIcelandair
Wed 10/1212:15LHR - YYZ
1 stop11h 00mIcelandair
Deal found 20/10£395
Wed 26/1119:40YYZ - LHR
1 stop10h 10mIcelandair
Sat 6/1212:15LHR - YYZ
1 stop11h 00mIcelandair
Deal found 20/10£396
Tue 11/1119:40YYZ - LHR
1 stop18h 50mIcelandair
Wed 26/1112:15LHR - YYZ
1 stop11h 00mIcelandair
Deal found 19/10£396
Thu 4/1219:40YYZ - LHR
1 stop18h 50mIcelandair
Thu 11/1212:15LHR - YYZ
1 stop11h 00mIcelandair
Deal found 20/10£397
Thu 4/1219:40YYZ - LHR
1 stop10h 10mIcelandair
Tue 9/1220:35LHR - YYZ
1 stop26h 40mIcelandair
Deal found 20/10£398
Thu 27/1119:40YYZ - LHR
1 stop18h 50mIcelandair
Tue 2/1220:35LHR - YYZ
1 stop26h 40mIcelandair
Deal found 18/10£399

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 21 October 2025.
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

YTZ - LHR

YTZLHR

Toronto Island

Tue 11/11

08:50-07:10

2 stops17h 20m

London Heathrow

Thu 13/11

09:00-17:55

2 stops13h 55m

£440

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Tue 4/11

15:35-08:45

1 stop12h 10m

London Heathrow

Wed 26/11

08:40-15:40

1 stop12h 00m

£444

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Tue 4/11

15:35-08:45

1 stop12h 10m

London Heathrow

Wed 19/11

10:00-15:40

1 stop10h 40m

£445

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Sat 29/11

14:00-06:30

1 stop11h 30m

London Heathrow

Sun 7/12

08:45-18:20

1 stop14h 35m

£445

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Sun 15/2

19:10-07:10

Nonstop7h 00m

London Heathrow

Wed 25/2

08:45-18:20

1 stop14h 35m

£446

TorontoLondon

YTZ - LHR

YTZLHR

Toronto Island

Mon 17/11

15:30-07:10

1 stop10h 40m

London Heathrow

Mon 24/11

09:00-17:55

2 stops13h 55m

£449

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Thu 19/3

12:10-09:20

2 stops17h 10m

London Heathrow

Mon 30/3

19:50-15:40

2 stops24h 50m

£450

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Wed 4/3

06:00-09:20

2 stops22h 20m

London Heathrow

Thu 19/3

19:30-16:40

1 stop25h 10m

£455

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Tue 10/3

21:50-08:40

Nonstop6h 50m

London Heathrow

Tue 17/3

16:30-20:05

Nonstop7h 35m

£460

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Thu 19/3

21:50-08:40

Nonstop6h 50m

London Heathrow

Sat 28/3

16:30-20:05

Nonstop7h 35m

£460

Flights are sorted by cheapest return flights first.

Deals found on 20/10

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, January is the cheapest month in which you can book a flight from Region of Ontario to London Heathrow Airport (average of £346). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of £493). 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 21 October 2025.

When flying from Region of Ontario to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 20% versus a flight in the evening.

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 21 October 2025.

The most flights from CAON to LHR are scheduled on a Monday (45 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (34 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 £444, Air Canada can have you in London Heathrow Airport from Region of Ontario in 12h 10m. 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?

    £197 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on TAP AIR PORTUGAL and Air Canada, with prices starting from £240 and £258, 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 KLM (90%), Air France (90%) or Delta (90%) 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 £924, our data indicates the cheapest price to be £214. The most popular route (Toronto Pearson Intl - London Heathrow), is priced around £373.

  • 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, January is the cheapest month in which you can book a flight from Region of Ontario to London Heathrow Airport (average of £346). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of £493). 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
Slough
Gatwick
Hounslow
Northampton
Luton
Wembley
Ilford
Deal
Hayes
Colchester
Watford
Crawley
Winchester
Swindon
Chichester
Romford
Ipswich
Bedford

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Alternative routes for Ontario to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Winnipeg to Heathrow flights
St. John's to Gatwick flights
Québec City to Heathrow flights
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Ottawa to Luton flights
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Regina 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 21 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£365Average£484FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£366Average£499FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air CanadaCheapest£380Average£797FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
KLMCheapest£381Average£453FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£388Average£574FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£399Average£612FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£402Average£528FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£415Average£502FlexibilityNo cancel feeOn-time76%
Search Finnair flights
American AirlinesCheapest£417Average£437FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest£471Average£573FlexibilityNo 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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