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Cheap flights from Ontario to London Heathrow Airport from £171

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 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — LHR
7 Jan — 14 Jan1
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 8 December 2025.

Sat 27/1218:05YYZ - LHR
Nonstop7h 10mAmerican Airlines
Thu 8/117:00LHR - YYZ
1 stop25h 03mAmerican Airlines
Deal found 7/12£429
Sat 27/1218:05YYZ - LHR
Nonstop7h 10mBritish Airways
Thu 8/117:00LHR - YYZ
1 stop31h 00mBritish Airways
Deal found 7/12£431
Wed 10/1217:40YYZ - LHR
Nonstop7h 10mAmerican Airlines
Mon 22/1211:40LHR - YYZ
Nonstop8h 10mAmerican Airlines
Deal found 7/12£438
Wed 31/1207:14YYZ - LHR
1 stop9h 56mAmerican Airlines
Thu 8/117:00LHR - YYZ
1 stop22h 14mAmerican Airlines
Deal found 7/12£447
Thu 11/1212:36YYZ - LHR
2 stops13h 24mAmerican Airlines
Fri 26/1215:35LHR - YYZ
1 stop28h 37mAmerican Airlines
Deal found 7/12£448
Tue 30/1218:23YYZ - LHR
1 stop32h 52mBritish Airways
Thu 8/117:00LHR - YYZ
1 stop27h 00mBritish Airways
Deal found 7/12£449
Thu 11/1209:10YUL - LHR
1 stop18h 20mAir Canada
Mon 19/112:05LHR - YUL
1 stop32h 05mAir Canada
Deal found 7/12£451
Wed 10/1215:35YUL - LHR
1 stop12h 45mAir Canada
Thu 22/106:50LHR - YUL
1 stop9h 55mAir Canada
Deal found 7/12£451
Thu 11/1219:30YUL - LHR
Nonstop6h 40mLufthansa
Mon 19/113:25LHR - YUL
Nonstop7h 45mLufthansa
Deal found 7/12£454
Sat 13/1216:44YYZ - LHR
1 stop12h 41mBritish Airways
Fri 26/1211:40LHR - YYZ
Nonstop8h 10mBritish Airways
Deal found 6/12£456
Wed 10/1219:30YUL - LHR
Nonstop6h 40mAir Canada
Sun 18/113:25LHR - YUL
Nonstop7h 45mAir Canada
Deal found 7/12£458
Sat 6/1217:10YUL - LHR
1 stop10h 20mAir Canada
Wed 10/1212:00LHR - YUL
1 stop12h 14mAir Canada
Deal found 5/12£459

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 8 December 2025.

Round-trip from

£425

One-way from

£171

Popular in

December

Cheapest in

February

Average price

£631

Good round-trip deal

£484 or less

Good one-way deal

£302 or less
Icelandair
  • Icelandair
  • 2/5-11/5
  • 2 total stops
  • 24h 15m total
  • Ontario to London
Search Deals
WestJet
  • WestJet
  • 21/1
  • 2 total stops
  • 48h 05m total
  • Ontario to London
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£23 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 December 2025
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 8 December 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

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Fri 24/4

23:20-20:20

1 stop16h 00m

London Heathrow

Thu 30/4

13:05-22:10

1 stop14h 05m

£433

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Mon 27/4

20:45-20:20

1 stop18h 35m

London Heathrow

Wed 13/5

13:05-19:10

1 stop11h 05m

£439

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Mon 27/4

23:20-20:20

1 stop16h 00m

London Heathrow

Fri 1/5

21:25-19:10

1 stop26h 45m

£439

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Mon 27/4

20:45-20:20

1 stop18h 35m

London Heathrow

Sun 10/5

21:25-19:10

1 stop26h 45m

£442

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Fri 1/5

23:20-20:20

1 stop16h 00m

London Heathrow

Thu 7/5

13:05-19:10

1 stop11h 05m

£446

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Mon 19/1

19:30-07:10

Nonstop6h 40m

London Heathrow

Wed 28/1

11:10-18:20

1 stop12h 10m

£450

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Fri 20/3

12:15-09:20

2 stops17h 05m

London Heathrow

Tue 24/3

19:50-16:40

2 stops24h 50m

£457

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Fri 16/1

19:05-10:30

1 stop10h 25m

London Heathrow

Mon 19/1

08:40-17:20

1 stop13h 40m

£457

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Tue 3/2

12:07-09:20

2 stops16h 13m

London Heathrow

Tue 10/2

19:50-15:40

2 stops24h 50m

£457

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Thu 8/1

06:00-08:45

1 stop21h 45m

London Heathrow

Tue 10/2

06:20-12:15

1 stop10h 55m

£460

Flights are sorted by cheapest return flights first.

Deals found on 7/12

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 £352). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of £499). 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 8 December 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 10% versus a flight in the afternoon.

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 8 December 2025.

The most flights from CAON to LHR are scheduled on a Friday (41 on average). You will have fewer flight options on Thursday, 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?

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 £450, Icelandair can have you in London Heathrow Airport from Region of Ontario in 6h 40m. Region of Ontario and London Heathrow Airport are separated by a distance of 3239 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?

    £171 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 £218 and £244, 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 (80%), Air France (80%) or Delta (80%) 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 £904, our data indicates the cheapest price to be £263. The most popular route (Toronto Pearson Intl - London Heathrow), is priced around £355.

  • 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 £352). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of £499). 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
Northampton
Hounslow
Luton
Gatwick
Wembley
Ilford
Brentford
Colchester
Watford
Hayes
Crawley
Winchester
Swindon
Deal
Bedford
Romford
Chichester

Browse thousands of different options on Cheapflights for your next trip

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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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Québec City to Gatwick flights
Québec City to Heathrow flights
Kelowna to Gatwick flights
Kelowna to Heathrow flights
St. John's to Gatwick 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 8 December 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£368Average£524FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£375Average£537FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air CanadaCheapest£382Average£799FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
KLMCheapest£384Average£456FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£391Average£608FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£401Average£609FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£405Average£541FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£419Average£440FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£419Average£514FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£474Average£577FlexibilityNo 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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