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Cheap flights from the United Kingdom to Ontario from £257

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 20/11. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
4 Dec — 11 Dec1
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 4 November 2025.

Round-trip from

£427

One-way from

£257

Popular in

December

Cheapest in

September

Average price

£475
Delta
  • Delta
  • 26/2-2/3
  • 3 total stops
  • 41h 37m total
  • United Kingdom to Ontario
Search Deals
20/11
  • 20/11
  • 2 total stops
  • 25h 20m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£17 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 November 2025
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 4 November 2025.

Wed 3/1210:45LHR - ONT
1 stop21h 13mVirgin Atlantic
Fri 12/1206:00ONT - LHR
1 stop20h 00mVirgin Atlantic
Deal found 3/11£460
Fri 14/1106:30LHR - ONT
2 stops21h 12mDelta
Thu 4/1207:05ONT - LHR
1 stop16h 45mDelta
Deal found 3/11£480
Mon 8/1215:50LHR - ONT
1 stop27h 12mDelta
Wed 24/1207:05ONT - LHR
1 stop20h 35mDelta
Deal found 3/11£480
Wed 31/1215:50LHR - ONT
1 stop26h 10mDelta
Thu 8/113:04ONT - LHR
1 stop14h 36mDelta
Deal found 2/11£481
Mon 8/1214:45LHR - ONT
1 stop16h 02mVirgin Atlantic
Tue 23/1206:00ONT - LHR
1 stop20h 00mVirgin Atlantic
Deal found 2/11£483
Mon 22/1214:45LHR - ONT
1 stop16h 04mDelta
Mon 5/115:30ONT - LHR
1 stop13h 20mDelta
Deal found 3/11£486
Tue 23/1210:45LHR - ONT
1 stop13h 27mDelta
Tue 26/511:55ONT - LHR
1 stop13h 05mDelta
Deal found 3/11£486
Fri 21/1108:55LHR - ONT
1 stop18h 47mDelta
Fri 28/1107:05ONT - LHR
1 stop16h 45mDelta
Deal found 3/11£488
Thu 25/1206:30LHR - ONT
2 stops18h 38mDelta
Wed 31/1213:15ONT - LHR
1 stop12h 45mDelta
Deal found 3/11£489
Mon 24/1120:05MAN - ONT
2 stops30h 17mBritish Airways
Mon 8/1215:04ONT - MAN
2 stops17h 26mBritish Airways
Deal found 2/11£588
Wed 19/1109:25EDI - ONT
2 stops21h 06mUnited Airlines
Wed 3/1213:34ONT - EDI
2 stops34h 21mUnited Airlines
Deal found 3/11£588
Fri 21/1109:00MAN - ONT
2 stops18h 23mBritish Airways
Tue 2/1215:19ONT - MAN
2 stops17h 11mBritish Airways
Deal found 3/11£628

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 4 November 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

Thu 26/2

08:55-21:07

1 stop20h 12m

Ontario

Mon 2/3

15:30-12:50

1 stop13h 20m

£411

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

10:45-23:53

1 stop21h 08m

Ontario

Mon 2/3

13:10-10:00

1 stop12h 50m

£440

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 10/1

15:05-22:29

1 stop15h 24m

Ontario

Thu 19/2

13:09-11:40

1 stop14h 31m

£440

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 10/1

15:05-22:29

1 stop15h 24m

Ontario

Sat 14/2

13:09-11:40

1 stop14h 31m

£440

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 11/1

10:45-22:38

1 stop19h 53m

Ontario

Mon 23/2

13:10-10:00

1 stop12h 50m

£440

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 14/1

10:45-16:13

1 stop13h 28m

Ontario

Mon 23/2

13:10-10:00

1 stop12h 50m

£440

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/3

14:45-22:38

1 stop14h 53m

Ontario

Tue 31/3

13:00-09:50

1 stop12h 50m

£443

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 28/4

10:55-16:14

1 stop13h 19m

Ontario

Sun 10/5

11:55-09:00

1 stop13h 05m

£452

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 26/2

12:30-22:31

2 stops42h 01m

Ontario

Mon 2/3

23:59-07:30

2 stops23h 31m

£470

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/3

10:45-21:48

1 stop19h 03m

Ontario

Fri 3/4

11:55-09:00

1 stop13h 05m

£471

Flights are sorted by cheapest return flights first.

Deals found on 3/11

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 £244). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £423). 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 4 November 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 4 November 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
1,405 reviews
Check prices

Boarding

7.8

Food

7.3

Comfort

7.7

Crew

8.4

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,405 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Boarding

7.8

Food

7.3

Comfort

7.7

Crew

8.4

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Virgin Atlantic
7.5
Good
671 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Boarding

7.8

Food

7.3

Comfort

7.7

Crew

8.4

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
United Airlines
7.4
Good
8,998 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Boarding

7.8

Food

7.3

Comfort

7.7

Crew

8.4

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Lufthansa
6.8
Okay
7,547 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Boarding

7.8

Food

7.3

Comfort

7.7

Crew

8.4

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,494 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Boarding

7.8

Food

7.3

Comfort

7.7

Crew

8.4

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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 £411, Delta can have you in Ontario from United Kingdom in 20h 12m. 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 cheapest airlines to fly from United Kingdom to Ontario one-way?

    The cheapet airlines for a one-way flight from United Kingdom to Ontario are British Airways (£310), United Airlines (£324), and Virgin Atlantic (£324).

  • 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 £244). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £423). 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 4 November 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£285Average£506FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£394Average£529FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£394Average£656FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£403Average£577FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£418Average£517FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
LufthansaCheapest£441Average£592FlexibilityNo 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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