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Cheap flights from Ontario to London Heathrow Airport from £210

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 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — LHR
23 May — 30 May1
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 23 April 2026.

Tue 2/607:35
YYZ
-
LHR
2 stops28h 45m
Multiple Airlines
Wed 10/615:10
LHR
-
YYZ
2 stops35h 35m
Multiple Airlines
Deal found 19/4£411
Wed 3/607:35
YYZ
-
LHR
2 stops26h 25m
Multiple Airlines
Wed 10/615:10
LHR
-
YYZ
2 stops28h 50m
Multiple Airlines
Deal found 20/4£413
Wed 27/507:35
YYZ
-
LHR
2 stops27h 25m
Multiple Airlines
Wed 3/615:50
LHR
-
YYZ
2 stops28h 10m
Multiple Airlines
Deal found 21/4£421
Tue 2/618:15
YYZ
-
LHR
2 stops15h 45m
Multiple Airlines
Mon 8/618:10
LHR
-
YYZ
1 stop25h 45m
Multiple Airlines
Deal found 20/4£422
Mon 1/622:55
YYZ
-
LHR
1 stop16h 25m
Multiple Airlines
Thu 4/607:40
LHR
-
YYZ
1 stop10h 40m
Multiple Airlines
Deal found 18/4£423
Mon 1/621:35
YYZ
-
LHR
1 stop12h 25m
Multiple Airlines
Tue 9/607:40
LHR
-
YYZ
1 stop10h 40m
Multiple Airlines
Deal found 19/4£424
Mon 18/520:45
YYZ
-
LHR
1 stop10h 10m
Icelandair
Wed 27/513:05
LHR
-
YYZ
1 stop14h 00m
Icelandair
Deal found 21/4£425
Wed 13/520:45
YYZ
-
LHR
1 stop18h 35m
Icelandair
Tue 19/521:25
LHR
-
YYZ
1 stop29h 40m
Icelandair
Deal found 20/4£426
Tue 19/520:45
YYZ
-
LHR
1 stop10h 10m
Icelandair
Tue 26/521:25
LHR
-
YYZ
1 stop29h 40m
Icelandair
Deal found 22/4£426
Thu 4/620:45
YYZ
-
LHR
1 stop10h 10m
Icelandair
Thu 11/613:05
LHR
-
YYZ
1 stop14h 00m
Icelandair
Deal found 20/4£427
Tue 19/520:45
YYZ
-
LHR
1 stop10h 10m
Icelandair
Wed 27/521:25
LHR
-
YYZ
1 stop29h 40m
Icelandair
Deal found 20/4£428
Mon 28/922:00
YUL
-
LHR
Nonstop6h 40m
British Airways
Sun 4/1018:05
LHR
-
YUL
Nonstop7h 10m
British Airways
Deal found 22/4£432

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 23 April 2026.

Round-trip from

£411

One-way from

£210

Popular in

December

Cheapest in

February

Average price

£448

Good round-trip deal

£490 or less

Good one-way deal

£335 or less
2/6-10/6
  • 2/6-10/6
  • 4 total stops
  • 64h 20m total
  • Ontario to London
Search Deals
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 10/9
  • 1 total stop
  • 14h 05m total
  • Ontario to London
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£11 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 April 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 23 April 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

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Fri 8/5

22:55-11:10

Nonstop7h 15m

London Heathrow

Sun 10/5

11:45-19:55

1 stop13h 10m

£478

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Thu 7/5

22:55-11:10

Nonstop7h 15m

London Heathrow

Wed 13/5

17:45-20:35

Nonstop7h 50m

£481
Fastest return journey

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Sun 17/5

22:55-11:10

Nonstop7h 15m

London Heathrow

Tue 16/6

17:45-20:35

Nonstop7h 50m

£483

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Sat 13/6

22:55-11:10

Nonstop7h 15m

London Heathrow

Thu 18/6

17:45-20:35

Nonstop7h 50m

£483

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Mon 4/5

22:55-11:10

Nonstop7h 15m

London Heathrow

Mon 11/5

17:45-20:35

Nonstop7h 50m

£483

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Tue 15/9

14:48-05:55

1 stop10h 07m

London Heathrow

Tue 22/9

12:10-14:17

2 stops55h 07m

£509

TorontoLondon

YTZ - LHR

YTZLHR

Toronto Island

Mon 15/6

14:55-06:55

1 stop11h 00m

London Heathrow

Sat 20/6

06:50-18:42

2 stops16h 52m

£510

OttawaLondon

YOW - LHR

YOWLHR

Ottawa

Fri 5/6

15:10-07:15

1 stop11h 05m

London Heathrow

Fri 12/6

06:55-18:48

2 stops16h 53m

£512

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Sat 9/5

13:55-06:45

1 stop11h 50m

London Heathrow

Sat 16/5

07:25-20:45

2 stops18h 20m

£513

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Sun 10/5

12:25-06:45

1 stop13h 20m

London Heathrow

Sat 16/5

06:50-18:28

2 stops16h 38m

£514

Flights are sorted by cheapest return flights first.

Deals found on 21/4

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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 £434). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of £662). 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 23 April 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 23 April 2026.

The most flights from CAON to LHR are scheduled on a Tuesday (37 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (18 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 £478, Delta 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 £241, 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, Toronto Island - London Heathrow or Montreal Pierre Elliott Trudeau Intl - 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 £524, our data indicates the cheapest price to be £268. The most popular route (Toronto Pearson Intl - London Heathrow), is priced around £421.

  • 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 £434). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of £662). 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
Wembley
Croydon
Hounslow
Northampton
Luton
Gatwick
Ilford
Slough
Hayes
Brentford
Colchester
Watford
Kingston upon Thames
Romford
Eastbourne
Swindon
Ipswich
Southend-on-Sea
Guildford

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 9 airlines flying from Ontario to Heathrow

Discover the top 9 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 23 April 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£358Average£533FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
KLMCheapest£376Average£544FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£386Average£652FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air CanadaCheapest£395Average£676FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest£403Average£580FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£403Average£559FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£417Average£530FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£455Average£547FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£468Average£569FlexibilityNo 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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