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Cheap flights from London Heathrow Airport to Ontario from £325

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
2 avr. — 9 avr.1
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 mars 2026.

mar. 10/309:30
LHR
-
ONT
2 stops18h 20m
United Airlines
mar. 17/313:50
ONT
-
LHR
1 stop12h 50m
United Airlines
Deal found 27/2£380
mar. 21/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
mar. 28/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 2/3£381
lun. 6/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
jeu. 16/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 1/3£382
jeu. 16/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
mar. 21/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 1/3£385
mar. 10/309:55
LHR
-
ONT
1 stop16h 50m
British Airways
mar. 17/315:19
ONT
-
LHR
1 stop13h 21m
British Airways
Deal found 27/2£389
mar. 10/311:25
LHR
-
ONT
2 stops42h 05m
British Airways
lun. 23/323:58
ONT
-
LHR
1 stop23h 52m
British Airways
Deal found 2/3£390
sam. 19/911:00
LHR
-
ONT
1 stop14h 39m
British Airways
sam. 26/913:31
ONT
-
LHR
1 stop12h 59m
British Airways
Deal found 2/3£391
lun. 13/410:05
LHR
-
ONT
1 stop16h 32m
British Airways
lun. 20/412:19
ONT
-
LHR
1 stop14h 31m
British Airways
Deal found 27/2£393
mar. 10/311:10
LHR
-
ONT
2 stops18h 47m
Air Canada
mar. 17/306:15
ONT
-
LHR
2 stops17h 15m
Air Canada
Deal found 27/2£394
mar. 14/406:10
LHR
-
ONT
2 stops22h 44m
Iberia
mar. 21/410:59
ONT
-
LHR
1 stop13h 06m
Iberia
Deal found 28/2£395
mer. 1/409:15
LHR
-
ONT
2 stops22h 44m
Iberia
lun. 6/407:00
ONT
-
LHR
1 stop15h 20m
Iberia
Deal found 1/3£397

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 mars 2026.

Round-trip from

£381

One-way from

£325

Popular in

December

Cheapest in

February

Average price

£518
British Airways
  • British Airways
  • 21/4-28/4
  • 2 total stops
  • 27h 23m total
  • London to Ontario
Search Deals
British Airways
  • British Airways
  • 5/5
  • 2 total stops
  • 22h 44m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 9% 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 3 mars 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

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 30/3

18:55-16:28

2 stops29h 33m

Ontario

lun. 6/4

13:20-15:35

2 stops18h 15m

£398

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mer. 1/4

14:25-22:30

1 stop16h 05m

Ontario

mer. 7/10

14:57-14:25

1 stop15h 28m

£410

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mer. 1/4

12:25-23:51

2 stops19h 26m

Ontario

lun. 6/4

13:20-15:00

2 stops17h 40m

£410

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mar. 31/3

10:55-16:28

1 stop13h 33m

Ontario

mer. 8/4

17:53-15:35

1 stop13h 42m

£418

LondonOntario

LHR - ONT

LHRONT

London Heathrow

ven. 3/4

10:05-16:22

1 stop14h 17m

Ontario

jeu. 9/4

12:19-10:50

1 stop14h 31m

£420

LondonOntario

LHR - ONT

LHRONT

London Heathrow

sam. 22/8

17:45-17:16

1 stop31h 31m

Ontario

dim. 13/9

07:00-07:15

1 stop16h 15m

£434

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mar. 4/8

17:45-12:49

1 stop27h 04m

Ontario

mer. 19/8

07:00-12:10

1 stop21h 10m

£448

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mer. 6/5

07:25-17:52

2 stops18h 27m

Ontario

ven. 15/5

07:00-07:55

2 stops16h 55m

£541

LondonOntario

LHR - ONT

LHRONT

London Heathrow

jeu. 27/8

17:00-11:09

1 stop26h 09m

Ontario

jeu. 17/9

06:00-15:05

1 stop25h 05m

£607

LondonOntario

LHR - ONT

LHRONT

London Heathrow

ven. 20/3

13:45-22:57

1 stop16h 12m

Ontario

sam. 28/3

13:50-11:20

1 stop14h 30m

£651

Flights are sorted by cheapest return flights first.

Deals found on 2/3

Showing 1-10 of 23 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 27 February 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 £331). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £389). 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 3 mars 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
7.7
Good
1,461 reviews
Check prices

Entertainment

7.1

Food

7.3

Overall

7.7

Comfort

7.6

Crew

8.4

Boarding

7.8

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
7.7
Good
1,461 reviews
KLM
7.7
Good
1,461 reviews
Check prices

Entertainment

7.1

Food

7.3

Overall

7.7

Comfort

7.6

Crew

8.4

Boarding

7.8

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
680 reviews
KLM
7.7
Good
1,461 reviews
Check prices

Entertainment

7.1

Food

7.3

Overall

7.7

Comfort

7.6

Crew

8.4

Boarding

7.8

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
9,378 reviews
KLM
7.7
Good
1,461 reviews
Check prices

Entertainment

7.1

Food

7.3

Overall

7.7

Comfort

7.6

Crew

8.4

Boarding

7.8

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
7,821 reviews
KLM
7.7
Good
1,461 reviews
Check prices

Entertainment

7.1

Food

7.3

Overall

7.7

Comfort

7.6

Crew

8.4

Boarding

7.8

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
7,773 reviews
KLM
7.7
Good
1,461 reviews
Check prices

Entertainment

7.1

Food

7.3

Overall

7.7

Comfort

7.6

Crew

8.4

Boarding

7.8

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?

    Virgin Atlantic, British Airways, and Delta can get you from London Heathrow Airport to Ontario in just under 13h 33m. Your travel time can differ by up to 16h. 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 £370, 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 £375 and £380, 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 £331). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £389). 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 3 mars 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£370Average£465FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£375Average£504FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£380Average£469FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£395Average£616FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£481Average£773FlexibilityNo 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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