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Cheap flights from London Heathrow Airport to Ontario from £396

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 28/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
17 Apr — 24 Apr1
1 adult

Cheap flight deals from Heathrow to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 12 April 2025.

Round-trip from

£403

One-way from

£396

Popular in

August

Cheapest in

February

Average price

£501
Virgin Atlantic
  • Virgin Atlantic
  • 7/5-11/5
  • 3 total stops
  • 38h 28m total
  • London to Ontario
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Lufthansa
  • Lufthansa
  • 28/4
  • 1 total stop
  • 16h 18m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£39 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).
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Average for round-trip flights in April 2025
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Find flight deals from Heathrow to Ontario

Cheapest flights from Heathrow to Ontario
Explore the most affordable flight options available from Heathrow to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 April 2025.

Wed 7/511:45LHR - ONT
2 stops19h 57mVirgin Atlantic
Sun 11/511:44ONT - LHR
1 stop18h 31mVirgin Atlantic
Deal found 11/4£403
Sun 20/415:40LHR - ONT
1 stop14h 18mBritish Airways
Sun 27/416:35ONT - LHR
1 stop12h 15mBritish Airways
Deal found 11/4£405
Sat 19/410:55LHR - ONT
1 stop13h 38mKLM
Wed 30/413:20ONT - LHR
1 stop12h 30mKLM
Deal found 11/4£414
Sat 19/408:20LHR - ONT
1 stop15h 47mFinnair
Sun 27/412:50ONT - LHR
1 stop14h 00mFinnair
Deal found 11/4£418
Fri 9/509:30LHR - ONT
2 stops19h 23mUnited Airlines
Fri 16/506:00ONT - LHR
1 stop17h 25mUnited Airlines
Deal found 11/4£470
Tue 9/909:30LHR - ONT
2 stops20h 56mMultiple Airlines
Tue 23/905:40ONT - LHR
2 stops16h 50mMultiple Airlines
Deal found 11/4£477
Wed 24/916:25LHR - ONT
1 stop15h 11mIberia
Mon 29/908:43ONT - LHR
1 stop13h 42mIberia
Deal found 11/4£479
Sun 1/618:30LHR - ONT
1 stop27h 45mDelta
Tue 16/911:29ONT - LHR
1 stop15h 51mDelta
Deal found 11/4£508
Mon 26/515:10LHR - ONT
1 stop16h 33mAmerican Airlines
Mon 2/613:14ONT - LHR
1 stop17h 26mAmerican Airlines
Deal found 11/4£580
Mon 15/908:15LHR - ONT
1 stop21h 26mIcelandair
Tue 30/923:00ONT - LHR
1 stop13h 45mIcelandair
Deal found 11/4£588
Thu 8/511:55LHR - ONT
1 stop17h 16mJetBlue
Sun 11/522:59ONT - LHR
1 stop13h 46mJetBlue
Deal found 11/4£634
Sat 21/608:30LHR - ONT
2 stops20h 34mAir Canada
Sat 28/618:38ONT - LHR
2 stops27h 57mAir Canada
Deal found 11/4£738

Cheapflights Fare Finder

Customise your flight search to find flights from Heathrow 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 12 April 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Fly from

Heathrow

Fly to

Ontario

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/5

11:45-23:42

2 stops19h 57m

Ontario

Sun 11/5

11:44-14:15

1 stop18h 31m

£403

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/5

16:25-23:43

1 stop15h 18m

Ontario

Sun 11/5

16:35-14:40

1 stop14h 05m

£405

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 2/5

11:20-19:28

1 stop16h 08m

Ontario

Tue 6/5

12:07-11:10

1 stop15h 03m

£414

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 26/4

15:40-21:58

1 stop14h 18m

Ontario

Sat 3/5

16:35-12:50

1 stop12h 15m

£418

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 9/5

09:30-20:53

2 stops19h 23m

Ontario

Fri 16/5

06:00-07:25

1 stop17h 25m

£470

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 9/9

09:30-22:26

2 stops20h 56m

Ontario

Tue 23/9

05:40-06:30

2 stops16h 50m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 24/9

16:25-23:36

1 stop15h 11m

Ontario

Mon 29/9

08:43-06:25

1 stop13h 42m

£479

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/6

18:30-14:15

1 stop27h 45m

Ontario

Tue 16/9

11:29-11:20

1 stop15h 51m

£508

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 15/9

08:15-21:41

1 stop21h 26m

Ontario

Tue 30/9

23:00-20:45

1 stop13h 45m

£588

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 9/5

08:15-21:11

1 stop20h 56m

Ontario

Mon 12/5

22:59-20:45

1 stop13h 46m

£619

Flights are sorted by cheapest return flights first.

Deals found on 11/4

Showing 1-10 of 29 results
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2
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Best time to book a flight from Heathrow to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Heathrow 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 London Heathrow Airport to Ontario

How far ahead should I book a flight from London Heathrow Airport to Ontario?

Use this chart to determine the optimal time to book a return flight from Heathrow to Ontario. Price data was last updated on 4 April 2025.

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Ontario, you should look to book at least 37 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from London Heathrow Airport to Ontario?

Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £516). Flying from London Heathrow Airport 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 LHR to ONT?

Find hourly flight availability from Heathrow 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 12 April 2025.

It’s optimal to fly from London Heathrow Airport to Ontario in the afternoon. By choosing this option you can save up to 24% on the cost of your flight, compared to a flight at midday.

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 12 April 2025.
Read through reviews of airlines operating flights from London to Ontario, such as Delta, KLM and Air France. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,912 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

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
7,912 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

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
1,321 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

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
1,428 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

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
United Airlines
7.4
Good
8,644 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

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
Virgin Atlantic
7.4
Good
641 reviews
Delta
8.0
Very Good
7,912 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

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 Heathrow 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 London Heathrow?

    If you book a flight to Ontario from London Heathrow, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from London Heathrow to Ontario per day from 6 different airlines.

  • What are the cheapest airlines flying from London Heathrow Airport to Ontario round-trip?

    Currently priced at £403, Virgin Atlantic will fly you from London Heathrow Airport to Ontario and back. In addition to Virgin Atlantic, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from British Airways and KLM - these airlines can fly you to your destination from £405 and £414, respectively. Users have found that Virgin Atlantic is 27% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from London Heathrow Airport to Ontario one-way?

    To fly one-way, consider booking your trip with Lufthansa, which is currently one of the cheapest options available, starting at £396. WestJet flights start at £472 while deals on British Airways start at £531 one-way.

  • Can I find deals for flights from Heathrow to Ontario that include hotel bookings?

    Yes. In addition to deals on Heathrow to Ontario flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Ontario.

  • Can I find deals for business class flights from Heathrow to Ontario?

    Yes. Cheapflights offers flight deals from Heathrow 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 London Heathrow Airport to Ontario?

    Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £516). Flying from London Heathrow Airport 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

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Alternative routes for Heathrow 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 Heathrow to Ontario

Discover the top 6 airlines that operate flights from Heathrow 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 12 April 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£389Average£595FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£406Average£591FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£418Average£520FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£420Average£501FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£421Average£564FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£452Average£539FlexibilityNo 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 Heathrow to Ontario?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Ontario?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Heathrow to Ontario for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Heathrow to Ontario with no change fees?

Yes! Cheapflights helps users easily find flights from Heathrow to Ontario with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Ontario become cheaper?

Yes, Cheapflights offers price alerts on Heathrow to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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