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Cheap flights from the United Kingdom to Ontario from £313

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 24/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
10 gen — 17 gen1
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 11 dicembre 2025.

lun 15/1214:45LHR - ONT
1 stop16h 02mVirgin Atlantic
dom 11/107:30ONT - LHR
1 stop19h 00mVirgin Atlantic
Deal found 10/12£507
gio 25/1206:30LHR - ONT
2 stops18h 38mDelta
gio 12/206:00ONT - LHR
2 stops17h 05mDelta
Deal found 9/12£517
dom 28/1210:45LHR - ONT
1 stop21h 09mDelta
lun 16/313:20ONT - LHR
1 stop13h 40mDelta
Deal found 8/12£519
mer 24/1206:20LHR - ONT
2 stops24h 13mDelta
mer 11/215:30ONT - LHR
2 stops20h 40mDelta
Deal found 9/12£521
lun 15/1211:45LHR - ONT
2 stops31h 17mDelta
mer 7/115:30ONT - LHR
1 stop35h 00mDelta
Deal found 10/12£522
mar 16/1210:45LHR - ONT
1 stop21h 13mDelta
sab 24/113:10ONT - LHR
1 stop12h 50mDelta
Deal found 8/12£525
sab 13/1210:45LHR - ONT
1 stop19h 10mDelta
mar 27/113:10ONT - LHR
1 stop12h 50mDelta
Deal found 8/12£526
dom 14/1206:20LHR - ONT
2 stops24h 44mDelta
sab 10/106:00ONT - LHR
2 stops17h 05mDelta
Deal found 10/12£527
mer 24/1210:45LHR - ONT
1 stop19h 48mDelta
mar 10/212:41ONT - LHR
1 stop14h 59mDelta
Deal found 9/12£530
lun 22/1216:30LHR - ONT
2 stops27h 23mAmerican Airlines
mer 31/1212:45ONT - LHR
1 stop13h 15mAmerican Airlines
Deal found 10/12£530
mer 24/1210:45LHR - ONT
1 stop19h 48mDelta
sab 14/213:15ONT - LHR
1 stop14h 25mDelta
Deal found 9/12£531
mer 24/1210:45LHR - ONT
1 stop19h 48mDelta
mar 30/1206:00ONT - LHR
1 stop20h 00mDelta
Deal found 10/12£533

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 11 dicembre 2025.

Round-trip from

£374

One-way from

£313

Popular in

July

Cheapest in

September

Average price

£587
United Airlines
  • United Airlines
  • 12/1-2/2
  • 2 total stops
  • 30h 09m total
  • United Kingdom to Ontario
Search Deals
British Airways
  • British Airways
  • 24/2
  • 1 total stop
  • 16h 04m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£49 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 December 2025
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 11 dicembre 2025.
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

lun 12/1

10:00-21:58

1 stop19h 58m

Ontario

mer 4/2

13:53-12:00

1 stop14h 07m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun 12/1

10:05-18:45

1 stop16h 40m

Ontario

mer 21/1

15:09-12:15

1 stop13h 06m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mar 3/3

10:05-17:41

1 stop15h 36m

Ontario

mer 18/3

13:40-12:00

1 stop15h 20m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun 19/1

10:05-17:43

1 stop15h 38m

Ontario

lun 26/1

13:24-09:40

1 stop12h 16m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mer 11/3

13:35-22:25

1 stop15h 50m

Ontario

mer 18/3

13:50-09:40

1 stop12h 50m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun 19/1

10:05-17:43

1 stop15h 38m

Ontario

mer 25/2

13:50-12:00

1 stop14h 10m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mer 14/1

10:05-17:43

1 stop15h 38m

Ontario

lun 2/2

13:53-12:00

1 stop14h 07m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun 12/1

10:05-17:43

1 stop15h 38m

Ontario

lun 26/1

13:53-12:00

1 stop14h 07m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mer 18/3

10:05-17:41

1 stop14h 36m

Ontario

mer 25/3

13:50-09:40

1 stop12h 50m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

sab 28/3

15:05-22:34

1 stop14h 29m

Ontario

sab 11/4

13:20-09:50

1 stop12h 30m

£506

Flights are sorted by cheapest return flights first.

Deals found on 10/12

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, September is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £240). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £404). 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.

What is the cheapest time of day to fly from GB to ONT?

Find hourly flight availability from United Kingdom to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 dicembre 2025.

Unlike at midday, when flights are generally more expensive, you can save up to 27% on flights from United Kingdom to Ontario by exploring options for tickets in the evening.

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 11 dicembre 2025.
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
1,432 reviews
Check prices

Boarding

7.8

Overall

7.7

Crew

8.3

Food

7.2

Comfort

7.6

Entertainment

7.1

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
1,432 reviews
KLM
7.7
Good
1,432 reviews
Check prices

Boarding

7.8

Overall

7.7

Crew

8.3

Food

7.2

Comfort

7.6

Entertainment

7.1

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
675 reviews
KLM
7.7
Good
1,432 reviews
Check prices

Boarding

7.8

Overall

7.7

Crew

8.3

Food

7.2

Comfort

7.6

Entertainment

7.1

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
9,093 reviews
KLM
7.7
Good
1,432 reviews
Check prices

Boarding

7.8

Overall

7.7

Crew

8.3

Food

7.2

Comfort

7.6

Entertainment

7.1

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
7,624 reviews
KLM
7.7
Good
1,432 reviews
Check prices

Boarding

7.8

Overall

7.7

Crew

8.3

Food

7.2

Comfort

7.6

Entertainment

7.1

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
7,573 reviews
KLM
7.7
Good
1,432 reviews
Check prices

Boarding

7.8

Overall

7.7

Crew

8.3

Food

7.2

Comfort

7.6

Entertainment

7.1

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 £499, United Airlines can have you in Ontario from United Kingdom in 16h 40m. 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 £240). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £404). 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 11 dicembre 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£281Average£461FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Virgin AtlanticCheapest£377Average£502FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£389Average£522FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£389Average£564FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£397Average£577FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£434Average£584FlexibilityNo 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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