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Cheap flights from London Heathrow Airport to Ontario from £312

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 17/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
2 Jan — 9 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Ontario

Enter your travel dates to find the best prices.

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 3 December 2025.

Mon 8/1206:30LHR - ONT
2 stops24h 17mVirgin Atlantic
Mon 15/1206:00ONT - LHR
1 stop20h 00mVirgin Atlantic
Deal found 1/12£422
Thu 25/1208:20LHR - ONT
1 stop21h 54mBritish Airways
Sat 10/116:45ONT - LHR
1 stop12h 30mBritish Airways
Deal found 1/12£432
Wed 24/1211:45LHR - ONT
2 stops42h 48mDelta
Tue 6/122:30ONT - LHR
2 stops24h 20mDelta
Deal found 2/12£433
Wed 10/1212:20LHR - ONT
1 stop18h 27mVirgin Atlantic
Tue 27/112:41ONT - LHR
1 stop14h 59mVirgin Atlantic
Deal found 1/12£435
Mon 8/1212:30LHR - ONT
1 stop18h 34mAir France
Mon 26/112:41ONT - LHR
1 stop14h 59mAir France
Deal found 1/12£435
Mon 8/1210:45LHR - ONT
1 stop20h 19mMultiple Airlines
Sun 25/107:30ONT - LHR
1 stop19h 00mMultiple Airlines
Deal found 1/12£437
Sat 13/1210:45LHR - ONT
1 stop19h 10mVirgin Atlantic
Mon 30/313:20ONT - LHR
1 stop12h 30mVirgin Atlantic
Deal found 1/12£445
Sat 13/1210:45LHR - ONT
1 stop19h 10mDelta
Sat 10/113:11ONT - LHR
1 stop12h 49mDelta
Deal found 1/12£446
Mon 8/1209:55LHR - ONT
1 stop17h 44mBritish Airways
Mon 15/1216:47ONT - LHR
1 stop12h 28mBritish Airways
Deal found 1/12£449
Tue 30/1210:45LHR - ONT
1 stop21h 09mVirgin Atlantic
Tue 20/107:30ONT - LHR
1 stop19h 00mVirgin Atlantic
Deal found 2/12£450
Tue 9/1215:00LHR - ONT
1 stop15h 28mIberia
Sun 25/110:58ONT - LHR
1 stop13h 37mIberia
Deal found 1/12£451
Tue 16/1214:45LHR - ONT
1 stop16h 02mVirgin Atlantic
Thu 8/107:30ONT - LHR
1 stop20h 25mVirgin Atlantic
Deal found 2/12£452

Find 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 3 December 2025.

Round-trip from

£417

One-way from

£312

Popular in

December

Cheapest in

September

Average price

£775
American Airlines
  • American Airlines
  • 24/12-11/1
  • 3 total stops
  • 35h 04m total
  • London to Ontario
Search Deals
British Airways
  • British Airways
  • 26/1
  • 2 total stops
  • 27h 13m 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).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£17 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 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 3 December 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

Fri 16/1

06:30-22:51

2 stops24h 21m

Ontario

Fri 23/1

12:41-11:40

1 stop14h 59m

£425

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 24/1

15:00-22:48

1 stop15h 48m

Ontario

Sat 31/1

16:45-13:15

1 stop12h 30m

£437

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 24/1

15:00-22:48

1 stop15h 48m

Ontario

Thu 29/1

15:09-12:15

1 stop13h 06m

£438

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 12/2

11:45-21:29

1 stop17h 44m

Ontario

Sun 22/2

17:06-13:15

1 stop12h 09m

£438

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/2

15:00-22:48

1 stop15h 48m

Ontario

Tue 24/2

15:19-12:15

1 stop12h 56m

£438

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/1

12:40-16:12

2 stops35h 32m

Ontario

Mon 27/7

22:59-06:25

2 stops23h 26m

£442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 24/12

12:20-17:08

1 stop36h 48m

Ontario

Tue 6/1

22:30-06:50

2 stops24h 20m

£446

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/3

12:20-22:34

1 stop17h 14m

Ontario

Mon 13/4

13:00-14:15

2 stops17h 15m

£447

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

16:10-11:35

2 stops26h 25m

Ontario

Sat 11/4

06:00-14:15

1 stop24h 15m

£449

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/4

11:20-17:13

1 stop13h 53m

Ontario

Mon 20/4

13:00-09:50

1 stop12h 50m

£451

Flights are sorted by cheapest return flights first.

Deals found on 1/12

Showing 1-10 of 21 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 28 November 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 75 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, December is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £344). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £410). 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 3 December 2025.

It’s optimal to fly from London Heathrow Airport to Ontario in the evening. By choosing this option you can save up to 27% on the cost of your flight, compared to a flight at midday.

How much does it cost for a return flight from London Heathrow Airport to Ontario?

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 3 December 2025.
Read reviews from past customers who have flown with KLM, Finnair, andVirgin Atlantic from London Heathrow Airport to Ontario. 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.
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Crew

8.4

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
1,426 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Crew

8.4

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.
Finnair
7.6
Good
1,334 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Crew

8.4

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
675 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Crew

8.4

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
7,602 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Crew

8.4

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
7,549 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Overall

7.7

Entertainment

7.1

Boarding

7.8

Comfort

7.6

Crew

8.4

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 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.

  • How long is the flight from London Heathrow Airport to Ontario?

    Delta and British Airways can get you from London Heathrow Airport to Ontario in just under 15h 48m. Your travel time can differ by up to 8h 33m. The distance between London Heathrow Airport and Ontario is about 5407 mi. This flight may include one or multiple stops.

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

    Currently priced at £284, Finnair will fly you from London Heathrow Airport to Ontario and back. In addition to Finnair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Virgin Atlantic and British Airways - these airlines can fly you to your destination from £381 and £392, respectively. Users have found that Finnair is 48% cheaper than the other options available to this destination.

  • 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, December is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £344). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £410). 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 3 December 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£284Average£503FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Virgin AtlanticCheapest£381Average£505FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£392Average£480FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£392Average£569FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£401Average£608FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£438Average£589FlexibilityNo 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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