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Cheap flights from London to Ontario from £250

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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — YYZ
20 Jul — 27 Jul1
1 adult

Cheap flight deals from London to Ontario

Keep the following information in mind while searching for London to Ontario flight deals. Data was last updated 15 July 2025.

Round-trip from

£345

One-way from

£250

Popular in

December

Cheapest in

February

Average price

£515

Good round-trip deal

£379 or less

Good one-way deal

£242 or less
Icelandair
  • Icelandair
  • 17/11-29/11
  • 2 total stops
  • 29h 45m total
  • London to Ontario
Search Deals
Air Transat
  • Air Transat
  • 1/9
  • 1 total stop
  • 28h 51m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£10 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Ontario.
Search Deals
Price to beat on a one-way flight from London (LON) to Ontario.
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Find flight deals from London to Ontario

Cheapest flights from London to Ontario
Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 July 2025.

Thu 28/811:35LGW - YTZ
1 stop27h 47mAir Transat
Sun 7/921:00YTZ - LGW
1 stop31h 50mAir Transat
Deal found 13/7£345
Mon 17/1112:15LHR - YYZ
1 stop11h 00mIcelandair
Sat 29/1119:45YYZ - LHR
1 stop18h 45mIcelandair
Deal found 13/7£345
Wed 3/915:40LGW - YYZ
1 stop11h 15mIcelandair
Mon 22/923:00YYZ - LGW
1 stop10h 35mIcelandair
Deal found 12/7£345
Thu 2/1017:50LHR - YYZ
Nonstop7h 50mVirgin Atlantic
Wed 15/1022:30YYZ - LHR
Nonstop7h 10mVirgin Atlantic
Deal found 13/7£345
Mon 25/812:40LGW - YYZ
Nonstop8h 00mAir Transat
Sun 7/923:15YYZ - LGW
1 stop29h 35mAir Transat
Deal found 13/7£345
Wed 27/809:40LGW - YUL
1 stop16h 52mAir Transat
Wed 3/920:05YUL - LGW
1 stop30h 50mAir Transat
Deal found 13/7£348
Mon 1/909:00LHR - YUL
1 stop14h 50mMultiple Airlines
Tue 9/916:40YUL - LHR
1 stop10h 15mMultiple Airlines
Deal found 14/7£348
Thu 18/906:00LHR - YYZ
1 stop12h 55mTAP AIR PORTUGAL
Sun 21/917:35YYZ - LHR
1 stop11h 45mTAP AIR PORTUGAL
Deal found 13/7£349
Tue 16/917:15LHR - YYZ
Nonstop7h 55mBritish Airways
Tue 23/922:15YYZ - LHR
Nonstop7h 15mBritish Airways
Deal found 14/7£351
Thu 23/1009:00LHR - YYZ
1 stop14h 30mLufthansa
Sun 18/118:15YYZ - LHR
1 stop13h 35mLufthansa
Deal found 14/7£351
Thu 9/1022:55STN - YYZ
2 stops28h 00mMultiple Airlines
Wed 15/1023:00YYZ - STN
2 stops18h 30mMultiple Airlines
Deal found 14/7£352
Sat 23/816:00LHR - YUL
1 stop23h 34mAir Canada
Mon 25/808:15YUL - LHR
1 stop17h 15mAir Canada
Deal found 14/7£353

Cheapflights Fare Finder

Customise your flight search to find flights from London to Ontario 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 15 July 2025.
Use the filters below to find and compare flights from London to Ontario that are best for you.

Fly from

London

Fly to

Ontario

Route

Depart

Return

Price

LondonToronto

LGW - YTZ

LGWYTZ

London Gatwick

Thu 28/8

11:35-10:22

1 stop27h 47m

Toronto Island

Sun 7/9

21:00-09:50

1 stop31h 50m

£345

LondonToronto

LHR - YYZ

LHRYYZ

London Heathrow

Mon 17/11

12:15-18:15

1 stop11h 00m

Toronto Pearson Intl

Sat 29/11

19:45-19:30

1 stop18h 45m

£345

LondonToronto

LGW - YYZ

LGWYYZ

London Gatwick

Wed 3/9

15:40-21:55

1 stop11h 15m

Toronto Pearson Intl

Fri 12/9

20:50-14:40

1 stop12h 50m

£345

LondonToronto

LHR - YYZ

LHRYYZ

London Heathrow

Thu 2/10

17:50-20:40

Nonstop7h 50m

Toronto Pearson Intl

Wed 15/10

22:30-10:40

Nonstop7h 10m

£345

LondonToronto

LGW - YYZ

LGWYYZ

London Gatwick

Mon 25/8

12:40-15:40

Nonstop8h 00m

Toronto Pearson Intl

Sun 7/9

23:15-09:50

1 stop29h 35m

£345

LondonMontreal

LGW - YUL

LGWYUL

London Gatwick

Wed 27/8

09:40-00:37

1 stop19h 57m

Montreal Pierre Elliott Trudeau Intl

Wed 3/9

20:05-07:55

1 stop30h 50m

£348

LondonMontreal

LHR - YUL

LHRYUL

London Heathrow

Mon 1/9

09:00-18:50

1 stop14h 50m

Montreal Pierre Elliott Trudeau Intl

Tue 9/9

16:40-07:55

1 stop10h 15m

£348

LondonToronto

LHR - YYZ

LHRYYZ

London Heathrow

Thu 18/9

06:00-13:55

1 stop12h 55m

Toronto Pearson Intl

Sun 21/9

17:35-10:20

1 stop11h 45m

£349

LondonToronto

LHR - YYZ

LHRYYZ

London Heathrow

Tue 16/9

17:15-20:10

Nonstop7h 55m

Toronto Pearson Intl

Tue 23/9

22:15-10:30

Nonstop7h 15m

£351

LondonToronto

LHR - YYZ

LHRYYZ

London Heathrow

Thu 23/10

09:00-18:30

1 stop14h 30m

Toronto Pearson Intl

Sun 18/1

18:15-12:50

1 stop13h 35m

£351

Flights are sorted by cheapest return flights first.

Deals found on 12/7

Showing 1-10 of 54 results
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Best time to book a flight from London to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from London 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 London to Ontario

What is the cheapest month to book a flight from London to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from London to Region of Ontario (average of £490). Flying from London to Region of Ontario in July is currently the most expensive (average of £708). 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 LON to ON?

Find hourly flight availability from London to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 July 2025.

When flying from London to Region of Ontario, 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 London to Region of Ontario

Explore weekly flight availability from London to Ontario. 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 15 July 2025.

The most flights from LON to CAON are scheduled on a Tuesday (43 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (29 on average).

How much does it cost for a return flight from London to Region of Ontario?

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated 15 July 2025.
Read reviews from past customers who have flown with Delta, KLM, andAir Transat from London to Ontario. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Delta
8.0
Very Good
7,956 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
KLM
7.8
Good
1,372 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Air Transat
7.8
Good
414 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
SWISS
7.5
Good
1,657 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very Good
7,956 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

7.9

Reviews

1 / 20
6.0
Good

Colin,Sept 2024

LHR - BOS

Delta One is very poor quality seating for first class. On multiple trips pieces have come off the seat. Staff and food have been good

Related info for your journey

Find useful and relevant information for your journey from London to Ontario. 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 London to Region of Ontario one-way?

    The cheapet airlines for a one-way flight from London to Region of Ontario are Air Transat (£250), TAP AIR PORTUGAL (£258), and WestJet (£258).

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

    The most popular route from London to Region of Ontario is London Heathrow - Toronto Pearson Intl. You may also consider London Gatwick - Toronto Pearson Intl or London City - Toronto Pearson Intl.

  • What are the most reliable airlines from London to Region of Ontario?

    The top 3 most reliable airlines when flying from London to Region of Ontario are Thai Airways (92%), Ethiopian Air (90%) and Air Canada (86%).

  • What are the cheapest flights from London to Region of Ontario?

    The cheapest flight price from London to Region of Ontario is £345. On average you can expect to pay £1,414. The most popular route, (London Heathrow - Toronto Pearson Intl), can usually be booked for £330.

  • Can I find deals for flights from London to Ontario that include hotel bookings?

    Yes. In addition to deals on London to Ontario flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Ontario.

  • Can I find deals for business class flights from London to Ontario?

    Yes. Cheapflights offers flight deals from London to Ontario 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 London to Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from London to Region of Ontario (average of £490). Flying from London to Region of Ontario in July is currently the most expensive (average of £708). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for London to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Heathrow to Pearson Intl flights
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London City to Halifax flights
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Top 10 airlines flying from London to Ontario

Discover the top 10 airlines that operate flights from London to Ontario. 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 15 July 2025.
AirlineCheapestAverageFlexibilityOn-time
PLAYCheapest£258Average£310FlexibilityNo cancel feeOn-timeN/A
Search PLAY flights
IcelandairCheapest£285Average£356FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£291Average£507FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
LufthansaCheapest£298Average£471FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Scandinavian AirlinesCheapest£298Average£524FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Air TransatCheapest£300Average£458FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Air CanadaCheapest£303Average£511FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
DeltaCheapest£305Average£498FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
TAP AIR PORTUGALCheapest£312Average£535FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
Virgin AtlanticCheapest£327Average£471FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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 London to Ontario?

When you search for this flight from London to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Millions of users choose and trust Cheapflights to book the best flight deals from London to Ontario 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 London to Ontario with no change fees?

Certainly. Search results for flights to Ontario from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from London to Ontario become cheaper?

Of course! You can now track prices for flights from London to Ontario and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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