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Cheap flights from the United Kingdom to Ontario from £351

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 7/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
26 Jun — 3 Jul1
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 27 May 2026.

Tue 22/907:30
LHR
-
ONT
2 stops20h 31m
United Airlines
Tue 6/1013:18
ONT
-
LHR
1 stop15h 07m
United Airlines
Deal found 26/5£488
Tue 22/913:00
LHR
-
ONT
1 stop15h 01m
Lufthansa
Tue 6/1009:39
ONT
-
LHR
1 stop13h 46m
Lufthansa
Deal found 26/5£498
Wed 7/1009:15
LHR
-
ONT
2 stops21h 51m
British Airways
Sun 11/1023:59
ONT
-
LHR
1 stop25h 01m
British Airways
Deal found 22/5£503
Tue 17/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Wed 9/1216:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 22/5£505
Thu 3/916:15
LHR
-
ONT
1 stop14h 44m
United Airlines
Mon 21/913:56
ONT
-
LHR
1 stop13h 14m
United Airlines
Deal found 22/5£509
Fri 11/913:00
LHR
-
ONT
1 stop15h 01m
United Airlines
Fri 25/913:18
ONT
-
LHR
1 stop15h 07m
United Airlines
Deal found 23/5£509
Mon 7/913:40
LHR
-
ONT
1 stop16h 19m
United Airlines
Fri 18/913:18
ONT
-
LHR
1 stop15h 07m
United Airlines
Deal found 26/5£511
Thu 1/1010:35
LHR
-
ONT
1 stop15h 16m
United Airlines
Mon 12/1013:49
ONT
-
LHR
1 stop13h 21m
United Airlines
Deal found 26/5£512
Tue 4/816:30
LHR
-
ONT
2 stops34h 17m
British Airways
Mon 24/814:27
ONT
-
LHR
1 stop13h 43m
British Airways
Deal found 25/5£515
Wed 12/810:05
LHR
-
ONT
1 stop16h 42m
Iberia
Wed 19/810:29
ONT
-
LHR
1 stop14h 31m
Iberia
Deal found 22/5£520
Tue 21/715:00
LHR
-
ONT
1 stop15h 34m
British Airways
Mon 27/712:35
ONT
-
LHR
1 stop17h 50m
British Airways
Deal found 22/5£522
Thu 24/911:30
LGW
-
ONT
2 stops19h 36m
Iberia
Thu 15/1012:35
ONT
-
LGW
2 stops23h 25m
Iberia
Deal found 25/5£549

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 27 May 2026.

Round-trip from

£498

One-way from

£351

Popular in

December

Cheapest in

September

Average price

£477
British Airways
  • British Airways
  • 21/7-27/7
  • 2 total stops
  • 35h 24m total
  • United Kingdom to Ontario
Search Deals
7/9
  • 7/9
  • 2 total stops
  • 58h 10m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£14 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 27 May 2026.
Use the filters below to find and compare flights from the United Kingdom to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 3/10

14:50-20:52

1 stop14h 02m

Ontario

Sat 10/10

16:03-14:10

1 stop14h 07m

£509

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 4/10

14:50-20:52

1 stop14h 02m

Ontario

Wed 14/10

13:18-12:35

1 stop15h 17m

£509

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 17/9

14:10-22:49

1 stop16h 39m

Ontario

Fri 25/9

13:18-09:40

1 stop12h 22m

£512

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/8

09:15-21:11

1 stop19h 56m

Ontario

Thu 13/8

12:33-10:55

1 stop14h 22m

£523

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 15/6

11:00-18:21

1 stop15h 21m

Ontario

Wed 22/7

13:10-11:05

1 stop13h 55m

£555

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 15/6

11:00-18:21

1 stop15h 21m

Ontario

Tue 21/7

13:10-11:05

1 stop13h 55m

£555

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 17/6

11:00-18:21

1 stop15h 21m

Ontario

Tue 21/7

13:10-11:05

1 stop13h 55m

£555

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/7

06:15-17:21

2 stops19h 06m

Ontario

Wed 22/7

09:40-13:15

2 stops19h 35m

£575

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 6/8

17:00-23:11

1 stop14h 11m

Ontario

Thu 20/8

15:07-15:05

1 stop15h 58m

£584
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 22/6

11:25-17:28

1 stop14h 03m

Ontario

Mon 6/7

13:18-09:40

1 stop12h 22m

£621

Flights are sorted by cheapest return flights first.

Deals found on 24/5

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
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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, March is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £296). Flying from United Kingdom to Ontario in May is currently the most expensive (average of £420). 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.

How far ahead should I book a flight from United Kingdom to Ontario?

To ensure you get the cheapest price possible for a flight from United Kingdom to Ontario, you should look to book at least 54 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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 27 May 2026.
Read through reviews of airlines operating flights from the United Kingdom to Ontario, such as Virgin Atlantic,United Airlines, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.5
Good
689 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
United Airlines
7.4
Good
9,753 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
British Airways
6.7
Okay
8,006 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.9

Overall

7.5

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

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 £509, United Airlines can have you in Ontario from United Kingdom in 14h 02m. 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 London Gatwick - Ontario or Manchester - 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, March is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £296). Flying from United Kingdom to Ontario in May is currently the most expensive (average of £420). 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

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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 3 airlines flying from United Kingdom to Ontario

Discover the top 3 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 27 May 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£368Average£427FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£372Average£479FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£386Average£520FlexibilityNo cancel feeOn-time70%
Search British Airways 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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