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Cheap flights from the United Kingdom to Ontario from £319

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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
4 mars — 11 mars1
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 2 février 2026.

mer. 18/311:05
LHR
-
ONT
2 stops19h 46m
Virgin Atlantic
mer. 25/311:59
ONT
-
LHR
1 stop15h 31m
Virgin Atlantic
Deal found 31/1£358
ven. 27/208:30
LHR
-
ONT
2 stops22h 27m
United Airlines
dim. 15/306:15
ONT
-
LHR
1 stop22h 45m
United Airlines
Deal found 1/2£361
jeu. 19/314:30
LHR
-
ONT
1 stop15h 04m
Virgin Atlantic
jeu. 26/312:57
ONT
-
LHR
1 stop13h 03m
Virgin Atlantic
Deal found 2/2£366
mer. 18/306:30
LHR
-
ONT
2 stops17h 43m
Delta
mer. 25/306:00
ONT
-
LHR
2 stops17h 25m
Delta
Deal found 31/1£368
lun. 9/206:30
LHR
-
ONT
2 stops22h 35m
Delta
lun. 23/217:00
ONT
-
LHR
2 stops19h 10m
Delta
Deal found 31/1£370
lun. 27/409:30
LHR
-
ONT
2 stops20h 20m
United Airlines
sam. 9/510:43
ONT
-
LHR
1 stop19h 27m
United Airlines
Deal found 1/2£374
lun. 9/213:30
LHR
-
ONT
2 stops17h 23m
United Airlines
jeu. 5/313:40
ONT
-
LHR
1 stop14h 20m
United Airlines
Deal found 1/2£375
lun. 9/209:30
LHR
-
ONT
2 stops20h 28m
United Airlines
lun. 23/218:37
ONT
-
LHR
1 stop28h 48m
United Airlines
Deal found 31/1£378
mar. 31/311:40
LHR
-
ONT
1 stop18h 54m
Delta
mar. 7/417:53
ONT
-
LHR
1 stop13h 42m
Delta
Deal found 1/2£380
lun. 27/410:25
LGW
-
ONT
2 stops20h 12m
Delta
sam. 9/513:35
ONT
-
LGW
2 stops18h 25m
Delta
Deal found 1/2£394
lun. 9/208:40
LCY
-
ONT
2 stops20h 25m
Delta
lun. 23/213:15
ONT
-
LCY
2 stops19h 20m
Delta
Deal found 31/1£403
dim. 8/211:45
LGW
-
ONT
2 stops43h 03m
British Airways
mar. 3/310:56
ONT
-
LGW
2 stops24h 04m
British Airways
Deal found 1/2£416

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 2 février 2026.

Round-trip from

£358

One-way from

£319

Popular in

December

Cheapest in

September

Average price

£396
Virgin Atlantic
  • Virgin Atlantic
  • 18/3-25/3
  • 3 total stops
  • 35h 17m total
  • United Kingdom to Ontario
Search Deals
9/2
  • 9/2
  • 2 total stops
  • 31h 02m 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. 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 2 février 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

mer. 18/3

06:30-17:13

2 stops17h 43m

Ontario

mer. 25/3

06:00-06:25

2 stops17h 25m

£368

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 2/3

14:30-22:37

1 stop16h 07m

Ontario

lun. 23/3

12:50-09:00

1 stop13h 10m

£380

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mar. 17/3

11:20-23:51

2 stops19h 31m

Ontario

mar. 24/3

13:20-11:55

2 stops15h 35m

£382

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mer. 18/3

12:20-22:34

1 stop17h 14m

Ontario

mar. 14/4

13:29-11:00

1 stop13h 31m

£382

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 16/3

14:30-22:34

1 stop15h 04m

Ontario

lun. 23/3

12:50-09:00

1 stop13h 10m

£384

LondonOntario

LHR - ONT

LHRONT

London Heathrow

ven. 20/2

10:05-17:41

1 stop15h 36m

Ontario

mer. 4/3

08:00-07:30

1 stop15h 30m

£385

LondonOntario

LHR - ONT

LHRONT

London Heathrow

ven. 20/2

13:45-20:07

1 stop14h 22m

Ontario

jeu. 26/2

13:40-12:00

1 stop14h 20m

£385

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mer. 4/3

10:05-17:41

1 stop15h 36m

Ontario

mer. 11/3

13:40-12:00

1 stop15h 20m

£385

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mar. 24/2

10:05-17:41

1 stop15h 36m

Ontario

mar. 24/3

13:50-09:40

1 stop12h 50m

£385

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mar. 24/2

10:05-17:41

1 stop15h 36m

Ontario

lun. 23/3

13:40-12:00

1 stop15h 20m

£385

Flights are sorted by cheapest return flights first.

Deals found on 1/2

Showing 1-10 of 60 results
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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, September is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £234). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £384). 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 2 février 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
1,357 reviews
Check prices

Entertainment

6.9

Food

6.7

Crew

8.2

Overall

7.6

Boarding

7.7

Comfort

7.5

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
1,357 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Entertainment

6.9

Food

6.7

Crew

8.2

Overall

7.6

Boarding

7.7

Comfort

7.5

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
678 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Entertainment

6.9

Food

6.7

Crew

8.2

Overall

7.6

Boarding

7.7

Comfort

7.5

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
9,231 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Entertainment

6.9

Food

6.7

Crew

8.2

Overall

7.6

Boarding

7.7

Comfort

7.5

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
7,758 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Entertainment

6.9

Food

6.7

Crew

8.2

Overall

7.6

Boarding

7.7

Comfort

7.5

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
7,711 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Entertainment

6.9

Food

6.7

Crew

8.2

Overall

7.6

Boarding

7.7

Comfort

7.5

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 £368, Delta can have you in Ontario from United Kingdom in 17h 43m. 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 London Gatwick - 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, September is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £234). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £384). 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 2 février 2026.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£274Average£429FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£362Average£455FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£369Average£489FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£378Average£517FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£387Average£603FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£415Average£568FlexibilityNo 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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