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Cheap flights from London Heathrow Airport to Ontario from £345

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 27/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
16 Apr — 23 Apr1
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 17 March 2026.

Tue 10/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Sun 15/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 13/3£449
Fri 24/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 28/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 12/3£452
Wed 15/407:25
LHR
-
ONT
2 stops18h 22m
United Airlines
Wed 22/418:49
ONT
-
LHR
2 stops17h 51m
United Airlines
Deal found 16/3£452
Wed 23/909:30
LHR
-
ONT
2 stops20h 29m
United Airlines
Mon 28/918:53
ONT
-
LHR
2 stops18h 42m
United Airlines
Deal found 16/3£453
Fri 8/510:50
LHR
-
ONT
2 stops20h 09m
United Airlines
Tue 12/506:00
ONT
-
LHR
1 stop24h 10m
United Airlines
Deal found 14/3£454
Wed 15/406:55
LHR
-
ONT
2 stops18h 52m
United Airlines
Wed 29/411:05
ONT
-
LHR
1 stop16h 05m
United Airlines
Deal found 17/3£455
Fri 24/410:50
LHR
-
ONT
2 stops19h 55m
United Airlines
Fri 8/513:40
ONT
-
LHR
2 stops23h 55m
United Airlines
Deal found 13/3£457
Tue 7/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Thu 23/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 13/3£458
Thu 19/311:35
LHR
-
ONT
1 stop16h 15m
United Airlines
Wed 1/413:34
ONT
-
LHR
1 stop15h 01m
United Airlines
Deal found 12/3£460
Fri 10/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Fri 24/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 13/3£461
Fri 24/416:15
LHR
-
ONT
1 stop14h 30m
United Airlines
Sat 16/513:30
ONT
-
LHR
1 stop13h 40m
United Airlines
Deal found 12/3£463

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 17 March 2026.

Round-trip from

£439

One-way from

£345

Popular in

December

Cheapest in

February

Average price

£531
United Airlines
  • United Airlines
  • 26/4-3/5
  • 3 total stops
  • 34h 55m total
  • London to Ontario
Search Deals
United Airlines
  • United Airlines
  • 27/4
  • 2 total stops
  • 19h 55m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£37 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£18 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
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 17 March 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 2/5

16:15-22:59

1 stop14h 44m

Ontario

Thu 7/5

13:30-11:10

1 stop13h 40m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 1/5

13:00-22:59

1 stop17h 59m

Ontario

Tue 5/5

07:00-06:45

1 stop15h 45m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 25/4

14:50-20:36

1 stop13h 46m

Ontario

Sat 9/5

13:30-11:10

1 stop13h 40m

£480

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 9/5

10:35-17:52

1 stop15h 17m

Ontario

Sat 16/5

13:30-11:10

1 stop13h 40m

£482

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/4

10:35-17:47

1 stop15h 12m

Ontario

Wed 22/4

13:27-11:10

1 stop13h 43m

£488

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 11/7

07:45-21:55

2 stops22h 10m

Ontario

Fri 24/7

05:00-05:55

2 stops16h 55m

£500
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 24/5

11:25-17:28

1 stop14h 03m

Ontario

Tue 2/6

13:50-11:10

1 stop13h 20m

£500

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

16:25-23:59

1 stop15h 34m

Ontario

Thu 9/4

12:19-10:50

1 stop14h 31m

£510

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

14:25-22:30

1 stop16h 05m

Ontario

Mon 6/4

12:22-10:50

1 stop14h 28m

£513

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 30/3

14:50-20:36

1 stop13h 46m

Ontario

Mon 6/4

13:27-11:10

1 stop13h 43m

£528

Flights are sorted by cheapest return flights first.

Deals found on 12/3

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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 13 March 2026.

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 £334). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £391). 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.

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 17 March 2026.
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
7.8
Good
1,472 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Overall

7.8

Crew

8.4

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7.8
Good
1,472 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Overall

7.8

Crew

8.4

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Virgin Atlantic
7.5
Good
682 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Overall

7.8

Crew

8.4

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
United Airlines
7.4
Good
9,432 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Overall

7.8

Crew

8.4

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Lufthansa
6.8
Okay
7,858 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Overall

7.8

Crew

8.4

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
British Airways
6.7
Okay
7,797 reviews
KLM
7.8
Good
1,472 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Overall

7.8

Crew

8.4

Food

7.3

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

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.

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

    United Airlines can get you from London Heathrow Airport to Ontario in just under 14h 44m. Your travel time can differ by up to . The distance between London Heathrow Airport and Ontario is about 5407 mi.

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

    Currently priced at £373, 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 Virgin Atlantic and British Airways - these airlines can fly you to your destination from £379 and £384, respectively. Users have found that United Airlines is 26% 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 £334). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £391). 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 17 March 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£373Average£469FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£379Average£515FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£384Average£479FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£472Average£622FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£485Average£780FlexibilityNo 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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