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Cheap flights from London Heathrow Airport to Ontario from £316

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 28/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
13 Dec — 20 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 13 November 2025.

Tue 16/1208:55LHR - ONT
1 stop22h 09mDelta
Fri 9/122:30ONT - LHR
1 stop23h 55mDelta
Deal found 11/11£462
Thu 25/1208:55LHR - ONT
1 stop18h 55mDelta
Thu 8/113:04ONT - LHR
1 stop14h 36mDelta
Deal found 11/11£464
Wed 24/1210:45LHR - ONT
1 stop19h 48mDelta
Wed 7/113:10ONT - LHR
1 stop12h 50mDelta
Deal found 12/11£465
Thu 25/1206:30LHR - ONT
2 stops35h 30mDelta
Fri 9/122:30ONT - LHR
2 stops23h 50mDelta
Deal found 12/11£466
Tue 16/1216:50LHR - ONT
2 stops25h 41mDelta
Mon 5/122:30ONT - LHR
2 stops47h 50mDelta
Deal found 11/11£477
Thu 11/1212:20LHR - ONT
1 stop18h 27mDelta
Mon 30/311:55ONT - LHR
1 stop13h 05mDelta
Deal found 12/11£479
Wed 19/1111:45LHR - ONT
2 stops31h 21mDelta
Fri 28/1107:05ONT - LHR
1 stop16h 45mDelta
Deal found 11/11£480
Fri 14/1106:30LHR - ONT
2 stops18h 39mDelta
Thu 4/1206:00ONT - LHR
2 stops17h 05mDelta
Deal found 11/11£481

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 13 November 2025.

Round-trip from

£365

One-way from

£316

Popular in

December

Cheapest in

September

Average price

£503
Virgin Atlantic
  • Virgin Atlantic
  • 28/1-8/2
  • 2 total stops
  • 28h 04m total
  • London to Ontario
Search Deals
Virgin Atlantic
  • Virgin Atlantic
  • 28/1
  • 2 total stops
  • 17h 53m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£28 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 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 13 November 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

Thu 26/2

06:30-21:07

2 stops22h 37m

Ontario

Mon 2/3

15:30-12:50

1 stop13h 20m

£414

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

11:05-21:52

2 stops17h 47m

Ontario

Sat 11/4

13:00-14:00

2 stops17h 00m

£415

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 21/3

15:05-22:38

1 stop14h 33m

Ontario

Sat 11/4

13:00-09:50

1 stop12h 50m

£415

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/3

11:05-21:52

2 stops17h 47m

Ontario

Sat 11/4

06:00-08:55

2 stops18h 55m

£415

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/3

14:45-22:38

1 stop14h 53m

Ontario

Sat 11/4

13:00-09:50

1 stop12h 50m

£415

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 15/12

12:20-22:47

1 stop18h 27m

Ontario

Thu 22/1

07:30-10:30

1 stop19h 00m

£462

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 25/12

08:55-19:50

1 stop18h 55m

Ontario

Thu 8/1

13:04-11:40

1 stop14h 36m

£468

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 13/12

15:05-22:47

1 stop15h 42m

Ontario

Tue 17/2

15:30-12:50

1 stop13h 20m

£479

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 13/12

15:05-22:47

1 stop15h 42m

Ontario

Sat 14/2

13:09-11:40

1 stop14h 31m

£479

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 11/12

14:45-22:47

1 stop16h 02m

Ontario

Sun 29/3

11:55-09:00

1 stop13h 05m

£479

Flights are sorted by cheapest return flights first.

Deals found on 11/11

Showing 1-10 of 21 results
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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 7 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 66 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 £346). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £421). 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 13 November 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.

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 13 November 2025.
Read reviews from past customers who have flown with KLM, Virgin Atlantic, andUnited Airlines 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
1,410 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Overall

7.7

Comfort

7.7

Crew

8.4

Food

7.3

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
1,410 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Overall

7.7

Comfort

7.7

Crew

8.4

Food

7.3

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
673 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Overall

7.7

Comfort

7.7

Crew

8.4

Food

7.3

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
9,015 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Overall

7.7

Comfort

7.7

Crew

8.4

Food

7.3

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
7,570 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Overall

7.7

Comfort

7.7

Crew

8.4

Food

7.3

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
7,516 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Boarding

7.8

Entertainment

7.1

Overall

7.7

Comfort

7.7

Crew

8.4

Food

7.3

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, Virgin Atlantic, and KLM can get you from London Heathrow Airport to Ontario in just under 14h 33m. Your travel time can differ by up to 8h 04m. 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 £286, 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 British Airways and United Airlines - these airlines can fly you to your destination from £394 and £395, respectively. Users have found that Finnair is 49% 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 £346). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £421). 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 13 November 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£286Average£506FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£394Average£476FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£395Average£657FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£403Average£611FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£418Average£518FlexibilityNo 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 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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