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Cheap flights from Ontario to London Heathrow Airport from C$ 343

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 27/5. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — LHR
2 Apr — 9 Apr1
1 adult

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 28 March 2025.

Round-trip from

C$ 672

One-way from

C$ 343

Popular in

December

Cheapest in

February

Average price

C$ 792

Good round-trip deal

C$ 865 or less

Good one-way deal

C$ 586 or less
Icelandair
  • Icelandair
  • 5/5-13/5
  • 2 total stops
  • 43h 05m total
  • Ontario to London
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27/5
  • 27/5
  • 1 total stop
  • 19h 20m total
  • Ontario to London
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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.
Search Deals

Find flight deals from Ontario to Heathrow

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 28 March 2025.

Mon 5/511:00 p.m.YYZ - LHR
1 stop16h 20mIcelandair
Tue 13/59:25 p.m.LHR - YYZ
1 stop26h 45mIcelandair
Deal found 26/3C$ 672
Mon 5/58:50 a.m.YTZ - LHR
1 stop16h 40mAir Canada
Thu 15/58:40 a.m.LHR - YTZ
2 stops14h 10mAir Canada
Deal found 27/3C$ 693
Tue 27/510:15 p.m.YYZ - LHR
1 stop19h 20mMultiple Airlines
Mon 9/66:20 a.m.LHR - YYZ
1 stop12h 50mMultiple Airlines
Deal found 27/3C$ 699
Mon 5/511:35 p.m.YYZ - LHR
Nonstop7h 15mAir Canada
Thu 15/58:40 a.m.LHR - YYZ
1 stop12h 45mAir Canada
Deal found 27/3C$ 716
Wed 21/510:00 p.m.YYZ - LHR
Nonstop7h 15mBritish Airways
Fri 30/51:20 p.m.LHR - YYZ
Nonstop7h 40mBritish Airways
Deal found 27/3C$ 725
Wed 9/410:00 p.m.YYZ - LHR
Nonstop7h 15mAmerican Airlines
Fri 18/45:15 p.m.LHR - YYZ
Nonstop7h 55mAmerican Airlines
Deal found 27/3C$ 750
Wed 23/410:40 p.m.YYZ - LHR
1 stop26h 50mLufthansa
Wed 30/45:40 p.m.LHR - YYZ
1 stop26h 14mLufthansa
Deal found 27/3C$ 755
Sat 10/56:15 p.m.YYZ - LHR
1 stop11h 00mVirgin Atlantic
Fri 16/56:30 a.m.LHR - YYZ
1 stop18h 25mVirgin Atlantic
Deal found 28/3C$ 766
Sat 3/53:25 p.m.YTZ - LHR
1 stop10h 05mMultiple Airlines
Sat 10/57:00 a.m.LHR - YTZ
2 stops15h 50mMultiple Airlines
Deal found 27/3C$ 789
Sun 11/510:25 p.m.YUL - LHR
Nonstop6h 35mAir Canada
Wed 21/59:30 a.m.LHR - YUL
Nonstop7h 10mAir Canada
Deal found 27/3C$ 798
Fri 16/58:30 p.m.YUL - LHR
2 stops30h 25mSWISS
Tue 20/56:00 a.m.LHR - YUL
1 stop14h 00mSWISS
Deal found 27/3C$ 799
Thu 24/48:50 a.m.YUL - LHR
1 stop16h 40mMultiple Airlines
Mon 5/58:05 p.m.LHR - YUL
1 stop23h 55mMultiple Airlines
Deal found 27/3C$ 800

Cheapflights Fare Finder

Customize 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 629,999 searches. Data last updated 28 March 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

Mon 5/5

11:00 p.m.-8:20 p.m.

1 stop16h 20m

London Heathrow

Tue 13/5

9:25 p.m.-7:10 p.m.

1 stop26h 45m

C$ 672

TorontoLondon

YTZ - LHR

YTZLHR

Toronto Island

Mon 5/5

8:50 a.m.-6:30 a.m.

1 stop16h 40m

London Heathrow

Thu 15/5

8:40 a.m.-5:50 p.m.

2 stops14h 10m

C$ 693

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Tue 27/5

10:15 p.m.-10:35 p.m.

1 stop19h 20m

London Heathrow

Mon 9/6

6:20 a.m.-2:10 p.m.

1 stop12h 50m

C$ 699

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Mon 5/5

11:35 p.m.-11:50 a.m.

Nonstop7h 15m

London Heathrow

Thu 15/5

8:40 a.m.-4:25 p.m.

1 stop12h 45m

C$ 716

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Fri 16/5

6:05 p.m.-6:15 a.m.

Nonstop7h 10m

London Heathrow

Tue 3/6

5:15 p.m.-8:10 p.m.

Nonstop7h 55m

C$ 725

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Tue 20/5

10:15 p.m.-10:30 a.m.

Nonstop7h 15m

London Heathrow

Sun 8/6

5:15 p.m.-8:10 p.m.

Nonstop7h 55m

C$ 750

TorontoLondon

YYZ - LHR

YYZLHR

Toronto Pearson Intl

Wed 23/4

10:40 p.m.-6:30 a.m.

1 stop26h 50m

London Heathrow

Wed 30/4

5:40 p.m.-2:54 p.m.

1 stop26h 14m

C$ 755

TorontoLondon

YTZ - LHR

YTZLHR

Toronto Island

Sat 3/5

3:25 p.m.-6:30 a.m.

1 stop10h 05m

London Heathrow

Sat 10/5

7:00 a.m.-5:50 p.m.

2 stops15h 50m

C$ 789

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Sun 11/5

10:25 p.m.-10:00 a.m.

Nonstop6h 35m

London Heathrow

Wed 21/5

9:30 a.m.-11:40 a.m.

Nonstop7h 10m

C$ 798

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Fri 16/5

8:30 p.m.-7:55 a.m.

2 stops30h 25m

London Heathrow

Tue 20/5

6:00 a.m.-3:00 p.m.

1 stop14h 00m

C$ 799

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/3

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 round-trip 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 C$ 560). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of C$ 874). 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 28 March 2025.

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.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 mm per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 28 March 2025.
Get a feel of what it's like to fly with Delta, KLM and Azores Airlines from Ontario to London by reading reviews from past customers. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,896 reviews
Check prices

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,896 reviews
Delta
8.0
Very good
7,896 reviews
Check prices

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very good
7,896 reviews
Check prices

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Azores Airlines
7.6
Good
63 reviews
Delta
8.0
Very good
7,896 reviews
Check prices

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very good
7,896 reviews
Check prices

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.5
Good
769 reviews
Delta
8.0
Very good
7,896 reviews
Check prices

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

8.0

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

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

    The cheapest airline one-way is TAP AIR PORTUGAL, with whom users have recently found tickets for as low as C$ 429. However, be on the lookout for offers from WestJet and Air Canada, as they are both options that can get you from Region of Ontario to London Heathrow Airport for a low price.

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

    The most popular flight routes from Region of Ontario to London Heathrow Airport are Toronto Pearson Intl - London Heathrow, Montreal Pierre Elliott Trudeau Intl - London Heathrow and Toronto Island - London Heathrow.

  • 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 (70%), Aer Lingus (70%) or Finnair (70%) 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?

    On average you can expect to pay C$ 3,042 for a flight from Region of Ontario to London Heathrow Airport. The cheapest flight overall is C$ 504 while the most popular route, (Toronto Pearson Intl - London Heathrow) is currently priced at C$ 679.

  • 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 vacation 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 C$ 560). Flying from Region of Ontario to London Heathrow Airport in July is currently the most expensive (average of C$ 874). 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 Ontario?

Book flights to Ontario if you plan to visit one of these locations
Brentford
Hounslow
Sutton
Slough
Milton Keynes
Romford
Watford
Luton
Bromley
Bedford
Southall

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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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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 629,999 searches. Data last updated 28 March 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapestC$ 503AverageC$ 1,117FlexibilityNo cancel feeOn-time76%
Search Finnair flights
PLAYCheapestC$ 529AverageC$ 680FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
TAP AIR PORTUGALCheapestC$ 548AverageC$ 689FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
IcelandairCheapestC$ 637AverageC$ 927FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapestC$ 665AverageC$ 834FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Porter AirlinesCheapestC$ 672AverageC$ 834FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
DeltaCheapestC$ 693AverageC$ 895FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air TransatCheapestC$ 719AverageC$ 958FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Air CanadaCheapestC$ 732AverageC$ 1,167FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
KLMCheapestC$ 734AverageC$ 877FlexibilityNo cancel feeOn-time75%
Search KLM flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers 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 helps you search for flights from Ontario to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Ontario to Heathrow for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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! Start tracking prices for Ontario to Heathrow flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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