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Cheap flights from the United Kingdom to Ontario from £274

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
8 Feb — 15 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap 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 9 January 2026.

Round-trip from

£274

Popular in

July

Cheapest in

September

Average price

£446
United Airlines
  • United Airlines
  • 11/2-25/2
  • 2 total stops
  • 36h 08m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£48 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 January 2026
Search Deals

Find 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 9 January 2026.

Wed 11/212:05LHR - ONT
1 stop17h 53mUnited Airlines
Wed 25/208:00ONT - LHR
1 stop18h 15mUnited Airlines
Deal found 7/1£274
Thu 22/107:30LHR - ONT
2 stops22h 28mUnited Airlines
Mon 26/106:00ONT - LHR
2 stops16h 20mUnited Airlines
Deal found 7/1£347
Thu 5/209:30LHR - ONT
2 stops21h 23mUnited Airlines
Thu 12/213:45ONT - LHR
2 stops22h 50mUnited Airlines
Deal found 7/1£347
Mon 27/409:30LHR - ONT
2 stops20h 20mUnited Airlines
Sat 9/518:54ONT - LHR
2 stops33h 26mUnited Airlines
Deal found 8/1£359
Thu 15/112:20LHR - ONT
2 stops18h 18mVirgin Atlantic
Wed 28/113:11ONT - LHR
2 stops33h 54mVirgin Atlantic
Deal found 8/1£364
Sat 31/112:05LHR - ONT
1 stop17h 53mMultiple Airlines
Mon 16/205:00ONT - LHR
2 stops18h 10mMultiple Airlines
Deal found 7/1£368
Sat 7/210:05LHR - ONT
1 stop15h 46mUnited Airlines
Sat 14/213:53ONT - LHR
1 stop14h 07mUnited Airlines
Deal found 8/1£370
Fri 23/111:35LHR - ONT
1 stop17h 23mUnited Airlines
Tue 27/113:24ONT - LHR
1 stop12h 16mUnited Airlines
Deal found 7/1£370
Thu 15/110:05LHR - ONT
1 stop20h 48mUnited Airlines
Wed 28/108:00ONT - LHR
1 stop18h 15mUnited Airlines
Deal found 8/1£371
Fri 23/119:40LGW - ONT
2 stops26h 38mIberia
Thu 29/107:16ONT - LGW
2 stops19h 34mIberia
Deal found 7/1£402
Thu 15/109:20LCY - ONT
2 stops19h 45mDelta
Wed 28/112:41ONT - LCY
2 stops19h 54mDelta
Deal found 8/1£406
Wed 21/109:20LCY - ONT
2 stops19h 45mDelta
Sat 24/122:30ONT - LCY
2 stops26h 20mDelta
Deal found 7/1£408

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 9 January 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

Thu 22/1

07:30-21:58

2 stops22h 28m

Ontario

Mon 26/1

06:00-06:20

2 stops16h 20m

£347

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 9/2

10:05-17:43

1 stop15h 38m

Ontario

Sun 22/2

13:50-12:00

1 stop14h 10m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 26/1

10:05-17:43

1 stop15h 38m

Ontario

Mon 9/2

13:24-09:40

1 stop12h 16m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 25/1

10:05-17:43

1 stop15h 38m

Ontario

Mon 2/2

13:53-12:00

1 stop14h 07m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 5/2

10:05-17:43

1 stop15h 38m

Ontario

Thu 26/2

13:40-12:00

1 stop14h 20m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/2

10:05-17:51

1 stop15h 46m

Ontario

Sat 14/2

13:53-12:00

1 stop14h 07m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 2/2

10:05-17:43

1 stop15h 38m

Ontario

Tue 17/3

13:50-09:40

1 stop12h 50m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

10:05-17:41

1 stop15h 36m

Ontario

Wed 4/3

13:50-12:00

1 stop14h 10m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 24/2

10:05-17:41

1 stop15h 36m

Ontario

Sat 7/3

13:40-12:00

1 stop14h 20m

£370

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Fri 23/1

19:40-14:18

2 stops26h 38m

Ontario

Thu 29/1

07:16-10:50

2 stops19h 34m

£402

Flights are sorted by cheapest return flights first.

Deals found on 6/1

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 £238). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £397). 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 9 January 2026.
Read through reviews of airlines operating flights from the United Kingdom to Ontario, such as KLM, Virgin Atlantic, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,434 reviews
Check prices

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Crew

8.4

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
KLM
7.7
Good
1,434 reviews
KLM
7.7
Good
1,434 reviews
Check prices

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Crew

8.4

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Virgin Atlantic
7.5
Good
678 reviews
KLM
7.7
Good
1,434 reviews
Check prices

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Crew

8.4

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
United Airlines
7.4
Good
9,143 reviews
KLM
7.7
Good
1,434 reviews
Check prices

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Crew

8.4

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Lufthansa
6.8
Okay
7,698 reviews
KLM
7.7
Good
1,434 reviews
Check prices

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Crew

8.4

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
British Airways
6.7
Okay
7,659 reviews
KLM
7.7
Good
1,434 reviews
Check prices

Comfort

7.6

Entertainment

7.1

Food

7.2

Boarding

7.8

Crew

8.4

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle

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 £408, United Airlines can have you in Ontario from United Kingdom in 19h 45m. The distance from United Kingdom to Ontario is about 5422 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 £238). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £397). 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 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 9 January 2026.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£279Average£457FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£371Average£511FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£374Average£500FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£385Average£559FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£394Average£575FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£431Average£579FlexibilityNo 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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