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Cheap flights from the United Kingdom to Ontario from £334

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.
LHR — ONT
21 Aug — 28 Aug1
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 22 July 2026.

Wed 5/813:40
LHR
-
ONT
1 stop16h 15m
United Airlines
Fri 21/813:18
ONT
-
LHR
1 stop12h 22m
United Airlines
Deal found 21/7£434
Wed 9/908:40
LHR
-
ONT
2 stops19h 21m
United Airlines
Wed 23/905:00
ONT
-
LHR
1 stop23h 35m
United Airlines
Deal found 21/7£448
Thu 17/909:30
LHR
-
ONT
2 stops20h 29m
United Airlines
Mon 21/913:56
ONT
-
LHR
1 stop13h 14m
United Airlines
Deal found 18/7£449
Fri 25/907:30
LHR
-
ONT
2 stops21h 01m
United Airlines
Wed 30/916:03
ONT
-
LHR
1 stop14h 07m
United Airlines
Deal found 21/7£450
Wed 18/1106:35
LHR
-
ONT
2 stops22h 21m
United Airlines
Thu 19/1106:00
ONT
-
LHR
1 stop17h 40m
United Airlines
Deal found 20/7£462
Wed 4/1110:00
LGW
-
ONT
2 stops20h 43m
Virgin Atlantic
Fri 4/1212:00
ONT
-
LGW
2 stops19h 45m
Virgin Atlantic
Deal found 17/7£506
Tue 18/820:40
LGW
-
ONT
2 stops34h 19m
British Airways
Fri 28/807:05
ONT
-
LGW
2 stops28h 55m
British Airways
Deal found 21/7£522
Tue 17/1118:55
LCY
-
ONT
2 stops29h 17m
Virgin Atlantic
Tue 1/1206:00
ONT
-
LCY
2 stops26h 35m
Virgin Atlantic
Deal found 21/7£526
Fri 25/909:20
LCY
-
ONT
2 stops21h 20m
Delta
Wed 30/917:15
ONT
-
LCY
2 stops15h 25m
Delta
Deal found 21/7£530
Tue 18/809:35
LCY
-
ONT
2 stops31h 59m
British Airways
Wed 26/810:29
ONT
-
LCY
2 stops21h 56m
British Airways
Deal found 21/7£542
Sun 30/811:30
LGW
-
ONT
2 stops19h 29m
Iberia
Tue 15/1206:00
ONT
-
LGW
2 stops20h 50m
Iberia
Deal found 22/7£572
Sun 16/819:15
LCY
-
ONT
2 stops35h 44m
British Airways
Thu 27/810:29
ONT
-
LCY
2 stops21h 56m
British Airways
Deal found 21/7£591

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 22 July 2026.

Round-trip from

£434

One-way from

£334

Popular in

December

Cheapest in

February

Average price

£538
United Airlines
  • United Airlines
  • 5/8-21/8
  • 2 total stops
  • 28h 37m total
  • United Kingdom to Ontario
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 10/9
  • 1 total stop
  • 14h 24m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£10 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 22 July 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

Thu 17/9

09:30-21:59

2 stops20h 29m

Ontario

Mon 21/9

13:56-11:10

1 stop13h 14m

£451

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 25/9

16:15-22:59

1 stop14h 44m

Ontario

Fri 2/10

09:25-07:25

1 stop14h 00m

£474

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 1/10

10:35-17:51

1 stop15h 16m

Ontario

Sun 18/10

13:52-11:10

1 stop13h 18m

£474

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 16/8

11:25-20:53

1 stop17h 28m

Ontario

Sun 23/8

07:00-07:55

2 stops16h 55m

£476

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 21/8

14:50-20:53

1 stop14h 03m

Ontario

Sun 6/9

13:18-12:35

1 stop15h 17m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 5/9

13:00-20:01

1 stop15h 01m

Ontario

Sat 12/9

13:56-11:10

1 stop13h 14m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 15/8

07:45-18:12

2 stops18h 27m

Ontario

Sat 22/8

07:00-08:30

1 stop17h 30m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 15/8

10:00-18:12

1 stop16h 12m

Ontario

Thu 27/8

13:18-12:25

1 stop15h 07m

£477
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 19/8

14:50-20:53

1 stop14h 03m

Ontario

Wed 9/9

13:18-09:40

1 stop12h 22m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 20/8

13:40-21:59

1 stop16h 19m

Ontario

Sat 5/9

13:18-09:40

1 stop12h 22m

£477

Flights are sorted by cheapest return flights first.

Deals found on 21/7

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, February is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £432). Flying from United Kingdom to Ontario in June is currently the most expensive (average of £665). 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 22 July 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
693 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Crew

8.1

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
693 reviews
Virgin Atlantic
7.5
Good
693 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Crew

8.1

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
10,018 reviews
Virgin Atlantic
7.5
Good
693 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Crew

8.1

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
8,124 reviews
Virgin Atlantic
7.5
Good
693 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Comfort

7.3

Crew

8.1

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 £451, United Airlines can have you in Ontario from United Kingdom in 20h 29m. 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, February is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £432). Flying from United Kingdom to Ontario in June is currently the most expensive (average of £665). 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 22 July 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£370Average£500FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£374Average£471FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£401Average£552FlexibilityNo 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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