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Cheap flights from the United Kingdom to Ontario from £323

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 17/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
10 Mar — 17 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 8 February 2026.

Fri 6/313:30
LHR
-
ONT
2 stops17h 27m
United Airlines
Thu 19/313:40
ONT
-
LHR
1 stop15h 20m
United Airlines
Deal found 7/2£361
Sun 1/313:30
LHR
-
ONT
2 stops17h 27m
United Airlines
Wed 11/306:00
ONT
-
LHR
2 stops17h 20m
United Airlines
Deal found 8/2£362
Tue 24/310:05
LHR
-
ONT
1 stop14h 36m
United Airlines
Sun 29/306:05
ONT
-
LHR
1 stop17h 35m
United Airlines
Deal found 7/2£391
Sat 28/210:05
LHR
-
ONT
1 stop15h 36m
United Airlines
Sun 8/306:15
ONT
-
LHR
1 stop18h 10m
United Airlines
Deal found 6/2£394
Wed 25/313:45
LHR
-
ONT
1 stop16h 12m
United Airlines
Thu 2/413:34
ONT
-
LHR
1 stop14h 46m
United Airlines
Deal found 7/2£397
Wed 25/313:45
LHR
-
ONT
1 stop16h 12m
United Airlines
Wed 1/413:27
ONT
-
LHR
1 stop13h 43m
United Airlines
Deal found 8/2£399
Wed 8/714:50
LHR
-
ONT
1 stop13h 27m
United Airlines
Sun 12/713:00
ONT
-
LHR
1 stop12h 40m
United Airlines
Deal found 5/2£413
Thu 19/216:30
LHR
-
ONT
1 stop15h 29m
British Airways
Mon 23/214:39
ONT
-
LHR
1 stop13h 01m
British Airways
Deal found 6/2£419
Mon 13/416:10
LHR
-
ONT
1 stop13h 49m
British Airways
Sun 26/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 6/2£424
Mon 27/412:55
LHR
-
ONT
1 stop17h 41m
Finnair
Sat 9/514:08
ONT
-
LHR
1 stop16h 17m
Finnair
Deal found 6/2£428
Mon 27/410:25
LGW
-
ONT
2 stops20h 12m
Delta
Sat 9/513:35
ONT
-
LGW
2 stops18h 25m
Delta
Deal found 5/2£460
Tue 17/219:15
LCY
-
ONT
2 stops46h 51m
British Airways
Sun 8/323:58
ONT
-
LCY
2 stops31h 37m
British Airways
Deal found 8/2£463

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 8 February 2026.

Round-trip from

£361

One-way from

£323

Popular in

December

Cheapest in

September

Average price

£391
United Airlines
  • United Airlines
  • 6/3-19/3
  • 3 total stops
  • 32h 47m total
  • United Kingdom to Ontario
Search Deals
United Airlines
  • United Airlines
  • 17/3
  • 2 total stops
  • 29h 48m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£22 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£7 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 8 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

Sun 1/3

13:30-22:57

2 stops17h 27m

Ontario

Wed 11/3

06:00-06:20

2 stops17h 20m

£362

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/2

10:05-17:41

1 stop15h 36m

Ontario

Sun 8/3

06:15-07:25

1 stop18h 10m

£394

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

10:25-22:18

1 stop18h 53m

Ontario

Wed 1/4

13:27-11:10

1 stop13h 43m

£397

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

13:45-22:57

1 stop16h 12m

Ontario

Thu 2/4

13:34-12:20

1 stop14h 46m

£397

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 22/4

10:05-16:22

1 stop14h 17m

Ontario

Sun 26/4

10:59-08:05

1 stop13h 06m

£444

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/2

16:30-23:59

1 stop15h 29m

Ontario

Fri 27/2

10:56-08:15

1 stop13h 19m

£449

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 6/3

13:30-22:57

2 stops17h 27m

Ontario

Thu 19/3

13:40-13:30

2 stops16h 50m

£450

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 25/6

16:10-21:51

1 stop13h 41m

Ontario

Mon 13/7

13:10-11:05

1 stop13h 55m

£456

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Mon 27/4

10:25-22:37

2 stops20h 12m

Ontario

Sat 9/5

13:35-16:00

2 stops18h 25m

£460

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/8

12:55-19:52

1 stop14h 57m

Ontario

Mon 31/8

16:54-15:05

1 stop14h 11m

£464

Flights are sorted by cheapest return flights first.

Deals found on 6/2

Showing 1-10 of 60 results
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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 £233). 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 8 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
1,357 reviews
Check prices

Boarding

7.7

Crew

8.2

Comfort

7.5

Entertainment

6.9

Food

6.7

Overall

7.6

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

Boarding

7.7

Crew

8.2

Comfort

7.5

Entertainment

6.9

Food

6.7

Overall

7.6

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

Boarding

7.7

Crew

8.2

Comfort

7.5

Entertainment

6.9

Food

6.7

Overall

7.6

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
9,259 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Crew

8.2

Comfort

7.5

Entertainment

6.9

Food

6.7

Overall

7.6

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
7,775 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Crew

8.2

Comfort

7.5

Entertainment

6.9

Food

6.7

Overall

7.6

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
7,723 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Crew

8.2

Comfort

7.5

Entertainment

6.9

Food

6.7

Overall

7.6

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 £362, United Airlines can have you in Ontario from United Kingdom in 17h 27m. 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 Glasgow Intl - 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 £233). 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 8 February 2026.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£275Average£432FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£364Average£457FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£369Average£491FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£378Average£454FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£389Average£607FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£417Average£571FlexibilityNo 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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