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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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
22 Apr — 29 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 23 March 2026.

Sun 19/409:00
LHR
-
ONT
2 stops21h 45m
United Airlines
Sun 26/406:00
ONT
-
LHR
2 stops19h 40m
United Airlines
Deal found 22/3£454
Fri 17/407:30
LHR
-
ONT
2 stops22h 20m
United Airlines
Sat 9/518:59
ONT
-
LHR
1 stop32h 11m
United Airlines
Deal found 18/3£455
Sat 18/410:50
LHR
-
ONT
2 stops19h 55m
United Airlines
Sat 25/413:27
ONT
-
LHR
1 stop16h 43m
United Airlines
Deal found 21/3£456
Tue 14/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 21/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 22/3£465
Sun 19/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Wed 29/410:59
ONT
-
LHR
1 stop12h 56m
British Airways
Deal found 20/3£466
Thu 16/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 21/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 19/3£466
Sat 7/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Mon 16/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 21/3£467
Wed 15/407:25
LHR
-
ONT
2 stops18h 22m
United Airlines
Wed 22/418:49
ONT
-
LHR
2 stops17h 51m
United Airlines
Deal found 18/3£469
Sun 3/513:40
LHR
-
ONT
1 stop16h 18m
Multiple Airlines
Sun 10/505:00
ONT
-
LHR
2 stops17h 35m
Multiple Airlines
Deal found 19/3£469
Mon 27/415:30
LHR
-
ONT
2 stops38h 20m
United Airlines
Sat 9/513:40
ONT
-
LHR
1 stop14h 40m
United Airlines
Deal found 19/3£470
Wed 8/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 21/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 22/3£477

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 23 March 2026.

Round-trip from

£454

One-way from

£350

Popular in

December

Cheapest in

February

Average price

£529
United Airlines
  • United Airlines
  • 6/5-13/5
  • 3 total stops
  • 41h 51m total
  • London to Ontario
Search Deals
British Airways
  • British Airways
  • 15/9
  • 2 total stops
  • 24h 51m 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 23 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

Fri 17/4

14:10-22:31

1 stop16h 21m

Ontario

Fri 8/5

13:30-11:10

1 stop13h 40m

£479

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 24/4

14:50-20:36

1 stop13h 46m

Ontario

Sat 2/5

13:40-12:25

1 stop14h 45m

£481

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/4

14:50-20:36

1 stop13h 46m

Ontario

Sat 18/4

18:49-11:10

1 stop32h 21m

£490

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 7/5

14:50-20:36

1 stop13h 46m

Ontario

Sun 24/5

13:50-11:10

1 stop13h 20m

£490

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 7/6

16:15-22:37

1 stop14h 22m

Ontario

Mon 15/6

05:00-07:15

2 stops18h 15m

£501
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/6

14:50-20:42

1 stop13h 52m

Ontario

Sat 27/6

13:18-09:40

1 stop12h 22m

£501

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/4

14:50-20:36

1 stop13h 46m

Ontario

Thu 16/4

13:34-12:25

1 stop14h 51m

£501

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 18/6

11:25-17:28

1 stop14h 03m

Ontario

Sun 12/7

13:18-09:40

1 stop12h 22m

£501

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 11/6

13:40-21:55

1 stop16h 15m

Ontario

Thu 18/6

13:18-09:40

1 stop12h 22m

£501

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 7/4

10:35-18:02

1 stop15h 27m

Ontario

Tue 14/4

13:27-11:10

1 stop13h 43m

£502

Flights are sorted by cheapest return flights first.

Deals found on 21/3

Showing 1-10 of 24 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 £333). 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 23 March 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
683 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.2

Boarding

7.7

Entertainment

7.6

Comfort

7.3

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
683 reviews
Virgin Atlantic
7.5
Good
683 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.2

Boarding

7.7

Entertainment

7.6

Comfort

7.3

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
United Airlines
7.4
Good
9,458 reviews
Virgin Atlantic
7.5
Good
683 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.2

Boarding

7.7

Entertainment

7.6

Comfort

7.3

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
7,811 reviews
Virgin Atlantic
7.5
Good
683 reviews
Check prices

Food

6.9

Overall

7.5

Crew

8.2

Boarding

7.7

Entertainment

7.6

Comfort

7.3

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

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 16h 21m. 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 £377 and £381, 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 £333). 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 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 23 March 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£372Average£467FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£377Average£504FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£381Average£468FlexibilityNo 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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