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Cheap flights from London Heathrow Airport to Ontario from £347

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 28/8. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
9 Jul — 16 Jul1
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 9 June 2026.

Fri 4/906:55
LHR
-
ONT
2 stops21h 58m
United Airlines
Tue 8/913:56
ONT
-
LHR
1 stop13h 14m
United Airlines
Deal found 6/6£418
Wed 8/709:30
LHR
-
ONT
2 stops20h 25m
United Airlines
Mon 13/705:00
ONT
-
LHR
2 stops20h 20m
United Airlines
Deal found 8/6£419
Fri 20/1109:30
LHR
-
ONT
2 stops21h 36m
United Airlines
Sat 28/1105:00
ONT
-
LHR
1 stop20h 40m
United Airlines
Deal found 6/6£421
Mon 2/1109:30
LHR
-
ONT
2 stops21h 36m
United Airlines
Mon 16/1106:00
ONT
-
LHR
1 stop17h 25m
United Airlines
Deal found 5/6£422
Wed 1/709:30
LHR
-
ONT
2 stops21h 21m
Lufthansa
Thu 30/713:18
ONT
-
LHR
1 stop12h 22m
Lufthansa
Deal found 9/6£433
Sat 27/613:00
LHR
-
ONT
1 stop17h 50m
Lufthansa
Tue 30/613:50
ONT
-
LHR
1 stop16h 20m
Lufthansa
Deal found 6/6£435
Wed 8/713:40
LHR
-
ONT
1 stop16h 15m
Lufthansa
Mon 13/706:00
ONT
-
LHR
1 stop17h 25m
Lufthansa
Deal found 5/6£435
Sun 14/614:50
LHR
-
ONT
1 stop13h 56m
United Airlines
Sun 28/613:18
ONT
-
LHR
1 stop12h 22m
United Airlines
Deal found 7/6£441
Tue 16/614:50
LHR
-
ONT
1 stop13h 56m
United Airlines
Tue 28/716:20
ONT
-
LHR
1 stop13h 50m
United Airlines
Deal found 9/6£442
Sat 27/613:00
LHR
-
ONT
1 stop17h 50m
United Airlines
Sun 5/713:18
ONT
-
LHR
1 stop12h 22m
United Airlines
Deal found 6/6£444
Fri 26/613:40
LHR
-
ONT
1 stop16h 15m
United Airlines
Fri 3/713:18
ONT
-
LHR
1 stop15h 07m
United Airlines
Deal found 5/6£445

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 9 June 2026.

Round-trip from

£418

One-way from

£347

Popular in

July

Cheapest in

February

Average price

£569
United Airlines
  • United Airlines
  • 4/9-8/9
  • 3 total stops
  • 35h 12m total
  • London to Ontario
Search Deals
British Airways
  • British Airways
  • 28/8
  • 1 total stop
  • 15h 15m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (£57 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 9 June 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

Wed 1/7

13:00-22:37

1 stop17h 37m

Ontario

Mon 6/7

13:18-09:40

1 stop12h 22m

£442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 17/10

13:40-21:59

1 stop16h 19m

Ontario

Sat 31/10

13:00-09:40

1 stop13h 40m

£442
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 29/6

16:15-22:37

1 stop14h 22m

Ontario

Tue 4/8

13:18-09:40

1 stop12h 22m

£442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 3/7

14:10-22:51

1 stop16h 41m

Ontario

Sun 12/7

13:18-09:40

1 stop12h 22m

£442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 6/9

13:40-21:59

1 stop16h 19m

Ontario

Thu 17/9

09:01-07:25

1 stop14h 24m

£442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/7

13:40-21:55

1 stop16h 15m

Ontario

Tue 7/7

13:18-09:40

1 stop12h 22m

£442

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/7

10:35-17:54

1 stop15h 19m

Ontario

Wed 8/7

13:18-09:40

1 stop12h 22m

£512

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 18/7

10:35-18:33

1 stop15h 58m

Ontario

Fri 24/7

13:18-12:25

1 stop15h 07m

£513

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 21/8

16:15-22:59

1 stop14h 44m

Ontario

Sat 29/8

13:18-09:40

1 stop12h 22m

£515

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/7

10:55-23:48

1 stop20h 53m

Ontario

Mon 20/7

11:59-12:05

1 stop16h 06m

£546

Flights are sorted by cheapest return flights first.

Deals found on 4/6

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?

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Ontario, you should look to book at least 74 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £394). Flying from London Heathrow Airport to Ontario in May is currently the most expensive (average of £602). 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.

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 9 June 2026.
Read reviews from past customers who have flown with Virgin Atlantic,United Airlines, andBritish Airways 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.
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Comfort

7.3

Overall

7.5

Entertainment

7.5

Crew

8.1

Food

6.9

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.5
Good
689 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Comfort

7.3

Overall

7.5

Entertainment

7.5

Crew

8.1

Food

6.9

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
United Airlines
7.4
Good
9,800 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Comfort

7.3

Overall

7.5

Entertainment

7.5

Crew

8.1

Food

6.9

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
British Airways
6.7
Okay
8,032 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Comfort

7.3

Overall

7.5

Entertainment

7.5

Crew

8.1

Food

6.9

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

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 3 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 21h 58m. 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 £372, 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 £376 and £403, respectively. Users have found that United Airlines is 25% 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £394). Flying from London Heathrow Airport to Ontario in May is currently the most expensive (average of £602). 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 3 airlines flying from Heathrow to Ontario

Discover the top 3 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 9 June 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£372Average£431FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£376Average£496FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£403Average£492FlexibilityNo cancel feeOn-time70%
Search British Airways 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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