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Cheap flights from the United Kingdom to Ontario from £297

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 8/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
22 Mar — 29 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from United Kingdom to Ontario
Explore the most affordable flight options available from United Kingdom to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 February 2026.

Wed 18/308:20
LHR
-
ONT
1 stop17h 22m
British Airways
Wed 25/310:56
ONT
-
LHR
1 stop14h 19m
British Airways
Deal found 18/2£380
Mon 30/310:05
LHR
-
ONT
1 stop14h 17m
British Airways
Mon 13/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 17/2£382
Mon 20/417:45
LHR
-
ONT
1 stop36h 52m
Virgin Atlantic
Tue 28/413:29
ONT
-
LHR
1 stop13h 31m
Virgin Atlantic
Deal found 19/2£386
Wed 18/313:05
LHR
-
ONT
2 stops17h 46m
Virgin Atlantic
Wed 25/311:59
ONT
-
LHR
1 stop15h 31m
Virgin Atlantic
Deal found 18/2£387
Wed 20/510:55
LHR
-
ONT
1 stop20h 39m
Virgin Atlantic
Wed 27/513:35
ONT
-
LHR
1 stop18h 00m
Virgin Atlantic
Deal found 17/2£388
Wed 18/308:20
LHR
-
ONT
1 stop21h 10m
Iberia
Wed 25/307:00
ONT
-
LHR
1 stop16h 50m
Iberia
Deal found 18/2£390
Mon 13/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 21/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 20/2£391
Wed 1/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Mon 13/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 19/2£392
Mon 30/310:05
LHR
-
ONT
1 stop14h 17m
British Airways
Wed 15/410:59
ONT
-
LHR
1 stop12h 56m
British Airways
Deal found 20/2£393
Wed 4/308:20
LHR
-
ONT
1 stop15h 59m
British Airways
Tue 17/310:56
ONT
-
LHR
1 stop14h 19m
British Airways
Deal found 20/2£394
Tue 14/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 21/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 16/2£395
Mon 30/316:25
LHR
-
ONT
1 stop15h 34m
British Airways
Wed 8/414:08
ONT
-
LHR
1 stop14h 02m
British Airways
Deal found 19/2£396

Find flight deals from United Kingdom to Ontario

Keep the following information in mind while searching for United Kingdom to Ontario flight deals. Data was last updated 20 February 2026.

Round-trip from

£380

One-way from

£297

Popular in

December

Cheapest in

September

Average price

£399
British Airways
  • British Airways
  • 18/3-25/3
  • 2 total stops
  • 31h 41m total
  • United Kingdom to Ontario
Search Deals
8/6
  • 8/6
  • 2 total stops
  • 37h 13m total
  • United Kingdom to Ontario
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. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from United Kingdom 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 20 February 2026.
Use the filters below to find and compare flights from the United Kingdom to Ontario that are best for you.

Fly from

United Kingdom

Fly to

Ontario

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 30/3

16:25-23:59

1 stop15h 34m

Ontario

Mon 6/4

17:02-15:05

1 stop14h 03m

£398

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/3

11:45-19:45

1 stop16h 00m

Ontario

Tue 24/3

10:56-06:50

1 stop12h 54m

£399

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/3

11:45-19:45

1 stop16h 00m

Ontario

Tue 10/3

15:19-11:40

1 stop13h 21m

£399

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 11/3

10:15-18:42

1 stop15h 27m

Ontario

Tue 31/3

10:56-08:05

1 stop13h 09m

£400

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 30/3

16:25-23:59

1 stop15h 34m

Ontario

Wed 15/4

12:19-10:50

1 stop14h 31m

£400

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/3

10:15-18:42

1 stop15h 27m

Ontario

Tue 31/3

10:56-08:05

1 stop13h 09m

£400

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 20/4

06:30-23:44

2 stops25h 14m

Ontario

Tue 28/4

13:29-13:15

2 stops15h 46m

£402

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 6/3

10:05-18:42

1 stop16h 37m

Ontario

Mon 9/3

23:58-06:50

1 stop23h 52m

£408

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 7/4

12:00-20:27

1 stop16h 27m

Ontario

Tue 14/4

10:59-08:05

1 stop13h 06m

£410

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/4

12:00-21:07

1 stop17h 07m

Ontario

Wed 15/4

14:08-12:10

1 stop14h 02m

£410

Flights are sorted by cheapest return flights first.

Deals found on 17/2

Showing 1-10 of 60 results
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2
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6

Best time to book a flight from United Kingdom to Ontario

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

What is the cheapest month to book a flight from United Kingdom to Ontario?

Currently, February is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £235). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £388). 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.

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 20 February 2026.
Read through reviews of airlines operating flights from the United Kingdom to Ontario, such as Finnair, Virgin Atlantic, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,365 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Overall

7.6

Food

6.7

Boarding

7.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Finnair
7.6
Good
1,365 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Overall

7.6

Food

6.7

Boarding

7.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Virgin Atlantic
7.5
Good
679 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Overall

7.6

Food

6.7

Boarding

7.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
United Airlines
7.4
Good
9,335 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Overall

7.6

Food

6.7

Boarding

7.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Lufthansa
6.8
Okay
7,794 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Overall

7.6

Food

6.7

Boarding

7.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
British Airways
6.7
Okay
7,756 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Entertainment

6.9

Comfort

7.4

Overall

7.6

Food

6.7

Boarding

7.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Related info for your journey

Find useful and relevant information for your journey from United Kingdom to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from United Kingdom?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ontario from United Kingdom.

  • How long is the flight from United Kingdom to Ontario?

    For as low as £398, British Airways can have you in Ontario from United Kingdom in 15h 34m. The distance from United Kingdom to Ontario is about 5407 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from United Kingdom to Ontario?

    While some choose either Manchester - Ontario or Edinburgh Turnhouse - Ontario, London Heathrow - Ontario is the most popular route from United Kingdom to Ontario.

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

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

  • How can I find direct flights from United Kingdom to Ontario?

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

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

    Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to Ontario?

    Currently, February is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £235). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £388). 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 United Kingdom to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from United Kingdom to Ontario

Discover the top 6 airlines that operate flights from United Kingdom 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 20 February 2026.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£278Average£436FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£368Average£462FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£373Average£496FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£382Average£524FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£393Average£613FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£478Average£758FlexibilityNo cancel feeOn-time76%
Search Lufthansa 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 United Kingdom to Ontario?

Deals for United Kingdom to Ontario flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights simply makes it quick and affordable to book flights from United Kingdom to Ontario by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from United Kingdom to Ontario with no change fees?

Need flexible booking options for your flight to Ontario from United Kingdom? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ontario from United Kingdom today and book when prices fit your budget.

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