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Cheap flights from London Heathrow Airport to Ontario from £350

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 19/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
6 Sep — 13 Sep1
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 7 August 2026.

Wed 12/811:25 -
1 stop17h 28m
Thu 20/807:00 -
1 stop17h 30m
Deal found 3/8£406
Wed 4/1109:00 -
2 stops19h 15m
Fri 4/1213:33 -
1 stop13h 42m
Deal found 6/8£413
Wed 18/1109:00 -
2 stops19h 15m
Thu 19/1106:00 -
2 stops21h 05m
Deal found 5/8£414
Thu 3/908:45 -
2 stops19h 16m
Wed 16/905:00 -
2 stops18h 15m
Deal found 5/8£415
Sun 6/907:25 -
2 stops18h 46m
Sat 12/908:00 -
1 stop15h 25m
Deal found 5/8£417
Fri 11/1207:30 -
2 stops20h 50m
Fri 1/105:00 -
1 stop20h 40m
Deal found 7/8£418
Fri 20/1109:30 -
2 stops18h 45m
Sat 5/1206:45 -
2 stops18h 25m
Deal found 4/8£424
Fri 4/908:40 -
2 stops22h 19m
Mon 7/905:00 -
2 stops17h 45m
Deal found 6/8£427
Wed 2/908:40 -
2 stops19h 21m
Wed 9/907:00 -
2 stops15h 55m
Deal found 5/8£429
Tue 10/1110:45 -
1 stop13h 45m
Mon 30/1113:25 -
1 stop12h 35m
Deal found 5/8£431

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 7 August 2026.

Round-trip from

£413

One-way from

£350

Popular in

July

Cheapest in

February

Average price

£596
United Airlines
  • United Airlines
  • 4/11-4/12
  • 3 total stops
  • 32h 57m total
  • London to Ontario
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 19/10
  • 1 total stop
  • 14h 42m 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 (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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 7 August 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 London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 20/11

09:30-20:15

2 stops18h 45m

Ontario

Sat 5/12

06:00-07:25

1 stop17h 25m

£417

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sun 11/10

10:35-17:36

1 stop15h 01m

Ontario

Thu 22/10

09:25-07:25

1 stop14h 00m

£441

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 2/9

08:40-20:01

2 stops19h 21m

Ontario

Thu 10/9

09:01-11:10

1 stop18h 09m

£441

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 6/11

10:05-17:56

1 stop15h 51m

Ontario

Sat 14/11

13:35-11:15

1 stop13h 40m

£441

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 11/12

09:00-17:47

2 stops40h 47m

Ontario

Mon 4/1

11:20-09:40

2 stops38h 20m

£441

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 4/9

11:05-22:35

1 stop19h 30m

Ontario

Mon 7/9

13:56-11:10

1 stop13h 14m

£442
Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 4/9

16:15-22:59

1 stop14h 44m

Ontario

Fri 11/9

13:18-09:40

1 stop12h 22m

£461

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 28/8

16:15-22:59

1 stop14h 44m

Ontario

Sun 30/8

13:18-09:40

1 stop12h 22m

£469

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 30/9

13:00-20:31

1 stop15h 31m

Ontario

Thu 8/10

09:25-07:25

1 stop14h 00m

£481

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 25/8

10:35-18:11

1 stop15h 36m

Ontario

Fri 25/9

07:00-06:45

1 stop15h 45m

£490

Flights are sorted by cheapest return flights first.

Deals found on 5/8

Showing 1-10 of 23 resultsSorted by cheapest first
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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

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 £404). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £612). 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?

Airfare is below average for this route at the moment.

London Heathrow Airport to Ontario flights typically cost between £525 and £666 in November.
The cheapest return price found within the last 5 days was £413 on United Airlines (4 Nov–4 Dec).

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 7 August 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
694 reviews
Check prices

Food

6.9

Overall

7.5

Boarding

7.7

Entertainment

7.5

Crew

8.1

Comfort

7.3

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
694 reviews
Virgin Atlantic
7.5
Good
694 reviews
Check prices

Food

6.9

Overall

7.5

Boarding

7.7

Entertainment

7.5

Crew

8.1

Comfort

7.3

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
10,085 reviews
Virgin Atlantic
7.5
Good
694 reviews
Check prices

Food

6.9

Overall

7.5

Boarding

7.7

Entertainment

7.5

Crew

8.1

Comfort

7.3

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
8,153 reviews
Virgin Atlantic
7.5
Good
694 reviews
Check prices

Food

6.9

Overall

7.5

Boarding

7.7

Entertainment

7.5

Crew

8.1

Comfort

7.3

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 18h 45m. 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 £368, 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 £373 and £399, respectively. Users have found that United Airlines is 27% 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 £404). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £612). 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 7 August 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£368Average£538FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£373Average£478FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£399Average£490FlexibilityNo 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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