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Cheap flights from London Heathrow Airport to Ontario from £331

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 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
21 Jan — 28 Jan1
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 16 January 2025.

Round-trip from

£404

One-way from

£331

Popular in

August

Cheapest in

February

Average price

£592
United Airlines
  • United Airlines
  • 4/2-11/2
  • 3 total stops
  • 53h 26m total
  • London to Ontario
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2/2
  • 2/2
  • 2 total stops
  • 24h 21m total
  • London to Ontario
Search Deals
High demand for flights, 7% potential price rise
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Best time to find cheap flights, 3% potential price drop
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Average for round-trip flights in January 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 16 January 2025.

Tue 4/209:30LHR - ONT
2 stops32h 21mUnited Airlines
Tue 11/206:00ONT - LHR
1 stop21h 05mUnited Airlines
Deal found 15/1£404
Tue 11/206:20LHR - ONT
2 stops18h 08mAir France
Tue 18/207:05ONT - LHR
1 stop19h 30mAir France
Deal found 15/1£414
Tue 4/219:30LHR - ONT
2 stops30h 34mMultiple Airlines
Tue 11/210:47ONT - LHR
2 stops23h 03mMultiple Airlines
Deal found 15/1£418
Tue 11/213:50LHR - ONT
1 stop16h 55mFinnair
Wed 26/214:54ONT - LHR
1 stop13h 11mFinnair
Deal found 15/1£420
Tue 28/114:30LHR - ONT
1 stop16h 22mKLM
Tue 11/213:00ONT - LHR
1 stop13h 35mKLM
Deal found 14/1£421
Tue 11/206:20LHR - ONT
2 stops17h 05mDelta
Tue 18/207:05ONT - LHR
2 stops15h 45mDelta
Deal found 15/1£432
Sat 8/307:40LHR - ONT
2 stops21h 17mLufthansa
Thu 20/306:00ONT - LHR
2 stops20h 40mLufthansa
Deal found 15/1£436
Tue 16/910:30LHR - ONT
1 stop15h 10mAmerican Airlines
Tue 30/917:09ONT - LHR
1 stop13h 31mAmerican Airlines
Deal found 16/1£444
Wed 19/310:40LHR - ONT
1 stop15h 21mBritish Airways
Thu 27/314:54ONT - LHR
1 stop14h 11mBritish Airways
Deal found 15/1£454
Mon 3/315:00LHR - ONT
2 stops37h 52mAir Canada
Sun 9/305:05ONT - LHR
2 stops42h 25mAir Canada
Deal found 14/1£466
Mon 15/912:00LHR - ONT
1 stop17h 56mIberia
Thu 2/1010:54ONT - LHR
1 stop14h 06mIberia
Deal found 16/1£470
Sat 25/110:45LHR - ONT
1 stop20h 40mVirgin Atlantic
Fri 28/213:21ONT - LHR
1 stop12h 39mVirgin Atlantic
Deal found 15/1£484

Find flights from Heathrow to Ontario within your budget

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 16 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/2

09:30-09:51

2 stops32h 21m

Ontario

Tue 11/2

06:00-11:05

1 stop21h 05m

£404

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 11/2

06:20-16:28

2 stops18h 08m

Ontario

Tue 18/2

07:05-10:35

1 stop19h 30m

£414

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/2

19:30-18:04

2 stops30h 34m

Ontario

Tue 11/2

10:47-17:50

2 stops23h 03m

£418

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 11/2

13:50-22:45

1 stop16h 55m

Ontario

Wed 26/2

14:54-12:05

1 stop13h 11m

£420

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 28/1

14:30-22:52

1 stop16h 22m

Ontario

Tue 11/2

13:00-10:35

1 stop13h 35m

£421

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 11/2

06:20-15:25

2 stops17h 05m

Ontario

Tue 18/2

07:05-06:50

2 stops15h 45m

£432

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 8/3

07:40-20:57

2 stops21h 17m

Ontario

Thu 20/3

06:00-09:40

2 stops20h 40m

£436

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 19/3

10:40-19:01

1 stop15h 21m

Ontario

Thu 27/3

14:54-12:05

1 stop14h 11m

£454

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 3/3

15:00-20:52

2 stops37h 52m

Ontario

Sun 9/3

05:05-06:30

2 stops42h 25m

£466

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 19/2

13:50-22:16

1 stop16h 26m

Ontario

Sun 23/2

14:54-12:05

1 stop13h 11m

£471

Flights are sorted by cheapest return flights first.

Deals found on 15/1

Showing 1-10 of 25 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.

Travel insights for flights from Heathrow to Ontario

Get recent, data-driven insights about flights from Heathrow to Ontario including ideal travel times, pricing trends, and more.

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 10 January 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 25 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 16 January 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 16 January 2025.
Read through reviews of airlines operating flights from London to Ontario, such as KLM, British Airways and Lufthansa. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
8,511 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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

Delta
8.0
Very Good
8,511 reviews
Delta
8.0
Very Good
8,511 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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

KLM
7.8
Good
1,339 reviews
Delta
8.0
Very Good
8,511 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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

Finnair
7.6
Good
1,285 reviews
Delta
8.0
Very Good
8,511 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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

Virgin Atlantic
7.5
Good
664 reviews
Delta
8.0
Very Good
8,511 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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

Air France
7.4
Good
1,487 reviews
Delta
8.0
Very Good
8,511 reviews
Check prices

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.3

Boarding

8.2

Entertainment

7.9

Reviews

1 / 10

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 5 different airlines.

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

    Currently priced at £404, United Airlines will fly you from London Heathrow Airport to Ontario and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Air France and Finnair - these airlines can fly you to your destination from £414 and £420, respectively. Users have found that United Airlines is 33% 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 £456. Iberia flights start at £467 while deals on Finnair start at £484 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 5 airlines flying from Heathrow to Ontario

Discover the top 5 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 16 January 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£407Average£559FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£447Average£677FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£448Average£536FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£483Average£572FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£550Average£794FlexibilityNo cancel feeOn-time69%
Search United Airlines 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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