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Cheap flights from the United Kingdom to Ontario from £362

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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
7 Apr — 14 Apr1
1 adult

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 2 April 2025.

Round-trip from

£404

One-way from

£362

Popular in

August

Cheapest in

February

Average price

£490
British Airways
  • British Airways
  • 5/9-26/9
  • 2 total stops
  • 28h 42m total
  • United Kingdom to Ontario
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2/6
  • 2/6
  • 3 total stops
  • 25h 24m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£43 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2025
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Find flight deals from United Kingdom to Ontario

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 April 2025.

Fri 5/916:25LHR - ONT
1 stop15h 11mBritish Airways
Fri 26/917:09ONT - LHR
1 stop13h 31mBritish Airways
Deal found 1/4£404
Sat 19/410:05LHR - ONT
2 stops18h 54mAlaska Airlines
Fri 2/514:44ONT - LHR
1 stop14h 01mAlaska Airlines
Deal found 1/4£416
Fri 2/511:20LHR - ONT
1 stop16h 08mKLM
Fri 9/513:10ONT - LHR
1 stop12h 40mKLM
Deal found 1/4£419
Sat 19/411:15LHR - ONT
1 stop18h 43mFinnair
Fri 2/512:50ONT - LHR
1 stop14h 00mFinnair
Deal found 1/4£422
Fri 16/506:30LHR - ONT
2 stops19h 50mDelta
Fri 23/514:55ONT - LHR
1 stop15h 20mDelta
Deal found 1/4£426
Sat 19/417:25LHR - ONT
2 stops31h 08mVirgin Atlantic
Fri 2/511:45ONT - LHR
1 stop18h 30mVirgin Atlantic
Deal found 1/4£437
Mon 8/910:00EDI - ONT
1 stop17h 42mKLM
Mon 29/912:00ONT - EDI
1 stop16h 05mKLM
Deal found 1/4£470
Fri 16/517:40LHR - ONT
2 stops35h 13mUnited Airlines
Fri 23/505:10ONT - LHR
2 stops17h 45mUnited Airlines
Deal found 1/4£480
Tue 2/915:10LHR - ONT
1 stop16h 19mIberia
Tue 16/915:00ONT - LHR
1 stop15h 25mIberia
Deal found 1/4£486
Fri 16/509:10EDI - ONT
2 stops21h 19mDelta
Fri 23/506:00ONT - EDI
2 stops22h 35mDelta
Deal found 1/4£488
Tue 13/511:15LHR - ONT
1 stop18h 42mAmerican Airlines
Sat 28/616:50ONT - LHR
1 stop13h 50mAmerican Airlines
Deal found 1/4£491
Sun 20/406:00NCL - ONT
2 stops20h 20mBritish Airways
Tue 29/416:35ONT - NCL
2 stops19h 15mBritish Airways
Deal found 1/4£495

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 April 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

Fri 5/9

16:25-23:36

1 stop15h 11m

Ontario

Fri 26/9

17:09-14:40

1 stop13h 31m

£404

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 19/4

10:05-20:59

2 stops18h 54m

Ontario

Fri 2/5

14:44-12:45

1 stop14h 01m

£416

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 2/5

11:20-19:28

1 stop16h 08m

Ontario

Fri 9/5

13:10-09:50

1 stop12h 40m

£419

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 19/4

11:15-21:58

1 stop18h 43m

Ontario

Fri 2/5

12:50-10:50

1 stop14h 00m

£422

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 16/5

06:30-18:20

2 stops19h 50m

Ontario

Fri 23/5

14:55-14:15

1 stop15h 20m

£426

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 19/4

17:25-16:33

2 stops31h 08m

Ontario

Fri 2/5

11:45-14:15

1 stop18h 30m

£437

EdinburghOntario

EDI - ONT

EDIONT

Edinburgh Turnhouse

Mon 8/9

10:00-19:42

1 stop17h 42m

Ontario

Mon 29/9

12:00-12:05

1 stop16h 05m

£470

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 16/5

17:40-20:53

2 stops35h 13m

Ontario

Fri 23/5

05:10-06:55

2 stops17h 45m

£480

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 2/9

15:10-23:29

1 stop16h 19m

Ontario

Tue 16/9

15:00-14:25

1 stop15h 25m

£486

EdinburghOntario

EDI - ONT

EDIONT

Edinburgh Turnhouse

Fri 16/5

09:10-22:29

2 stops21h 19m

Ontario

Fri 23/5

06:00-12:35

2 stops22h 35m

£488

Flights are sorted by cheapest return flights first.

Deals found on 1/4

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, March is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £516). Flying from United Kingdom to Ontario in August is currently the most expensive (average of £827). 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 2 April 2025.

When flying from United Kingdom to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 3.0 - 86.0 inches per month. February is typically the wettest month, when rainfall can reach 86.0 mm. June is typically the driest time to visit Ontario when rainfall is around 3.0 mm.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 26.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 12.0 C).

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 April 2025.
To help decide which airline to fly from United Kingdom to Ontario, see what other customers have to say about Delta, Alaska Airlines and KLM. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,897 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very Good
7,897 reviews
Delta
8.0
Very Good
7,897 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Alaska Airlines
8.0
Very Good
9,825 reviews
Delta
8.0
Very Good
7,897 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very Good
7,897 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very Good
7,897 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.4
Good
1,427 reviews
Delta
8.0
Very Good
7,897 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • 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 Iberia (£410), Lufthansa (£443), and Air France (£497).

  • 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, March is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £516). Flying from United Kingdom to Ontario in August is currently the most expensive (average of £827). 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 April 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£393Average£618FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£411Average£613FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£423Average£526FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£423Average£580FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£424Average£506FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£457Average£553FlexibilityNo 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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