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Cheap flights from London Heathrow Airport to Ontario from £323

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
10 Mar — 17 Mar1
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 8 February 2026.

Fri 6/313:30
LHR
-
ONT
2 stops17h 27m
United Airlines
Thu 19/313:40
ONT
-
LHR
1 stop15h 20m
United Airlines
Deal found 7/2£361
Sun 1/313:30
LHR
-
ONT
2 stops17h 27m
United Airlines
Wed 11/306:00
ONT
-
LHR
2 stops17h 20m
United Airlines
Deal found 8/2£362
Tue 24/310:05
LHR
-
ONT
1 stop14h 36m
United Airlines
Sun 29/306:05
ONT
-
LHR
1 stop17h 35m
United Airlines
Deal found 7/2£391
Sat 28/210:05
LHR
-
ONT
1 stop15h 36m
United Airlines
Sun 8/306:15
ONT
-
LHR
1 stop18h 10m
United Airlines
Deal found 6/2£394
Wed 25/313:45
LHR
-
ONT
1 stop16h 12m
United Airlines
Thu 2/413:34
ONT
-
LHR
1 stop14h 46m
United Airlines
Deal found 7/2£397
Wed 25/313:45
LHR
-
ONT
1 stop16h 12m
United Airlines
Wed 1/413:27
ONT
-
LHR
1 stop13h 43m
United Airlines
Deal found 8/2£399
Wed 8/714:50
LHR
-
ONT
1 stop13h 27m
United Airlines
Sun 12/713:00
ONT
-
LHR
1 stop12h 40m
United Airlines
Deal found 5/2£413
Thu 19/216:30
LHR
-
ONT
1 stop15h 29m
British Airways
Mon 23/214:39
ONT
-
LHR
1 stop13h 01m
British Airways
Deal found 6/2£419
Mon 13/416:10
LHR
-
ONT
1 stop13h 49m
British Airways
Sun 26/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 6/2£424
Mon 27/412:55
LHR
-
ONT
1 stop17h 41m
Finnair
Sat 9/514:08
ONT
-
LHR
1 stop16h 17m
Finnair
Deal found 6/2£428

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 8 February 2026.

Round-trip from

£361

One-way from

£323

Popular in

December

Cheapest in

February

Average price

£386
United Airlines
  • United Airlines
  • 6/3-19/3
  • 3 total stops
  • 32h 47m total
  • London to Ontario
Search Deals
United Airlines
  • United Airlines
  • 17/3
  • 2 total stops
  • 29h 48m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£43 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£18 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 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 8 February 2026.
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

Sun 1/3

13:30-22:57

2 stops17h 27m

Ontario

Wed 11/3

06:00-06:20

2 stops17h 20m

£362

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 28/2

10:05-17:41

1 stop15h 36m

Ontario

Sun 8/3

06:15-07:25

1 stop18h 10m

£394

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

10:25-22:18

1 stop18h 53m

Ontario

Wed 1/4

13:27-11:10

1 stop13h 43m

£397

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 25/3

13:45-22:57

1 stop16h 12m

Ontario

Thu 2/4

13:34-12:20

1 stop14h 46m

£397

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 22/4

10:05-16:22

1 stop14h 17m

Ontario

Sun 26/4

10:59-08:05

1 stop13h 06m

£444

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 20/2

16:30-23:59

1 stop15h 29m

Ontario

Fri 27/2

10:56-08:15

1 stop13h 19m

£449

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 6/3

13:30-22:57

2 stops17h 27m

Ontario

Thu 19/3

13:40-13:30

2 stops16h 50m

£450

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 25/6

16:10-21:51

1 stop13h 41m

Ontario

Mon 13/7

13:10-11:05

1 stop13h 55m

£456

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/8

12:55-19:52

1 stop14h 57m

Ontario

Mon 31/8

16:54-15:05

1 stop14h 11m

£464

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/3

09:30-22:57

2 stops20h 27m

Ontario

Wed 18/3

06:00-09:10

2 stops20h 10m

£474

Flights are sorted by cheapest return flights first.

Deals found on 6/2

Showing 1-10 of 20 results
1
2

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 6 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 £326). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £386). 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 8 February 2026.
Read reviews from past customers who have flown with Finnair, 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.
Finnair
7.6
Good
1,357 reviews
Check prices

Overall

7.6

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Finnair
7.6
Good
1,357 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Overall

7.6

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Virgin Atlantic
7.5
Good
678 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Overall

7.6

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
United Airlines
7.4
Good
9,259 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Overall

7.6

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Lufthansa
6.8
Okay
7,775 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Overall

7.6

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
British Airways
6.7
Okay
7,723 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Overall

7.6

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

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?

    United Airlines can get you from London Heathrow Airport to Ontario in just under 17h 27m. 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 £275, 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 United Airlines and Virgin Atlantic - these airlines can fly you to your destination from £364 and £369, respectively. Users have found that Finnair is 43% 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 £326). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £386). 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 8 February 2026.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£275Average£432FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£364Average£457FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£369Average£491FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£378Average£461FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£389Average£607FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£417Average£571FlexibilityNo 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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