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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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
15 Feb — 22 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap 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 16 January 2026.

Round-trip from

£347

One-way from

£323

Popular in

December

Cheapest in

January

Average price

£412
United Airlines
  • United Airlines
  • 12/2-23/2
  • 4 total stops
  • 42h 32m total
  • London to Ontario
Search Deals
United Airlines
  • United Airlines
  • 4/3
  • 2 total stops
  • 20h 27m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£34 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 January 2026
Search Deals

Find 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 16 January 2026.

Thu 12/209:30
LHR
-
ONT
2 stops21h 27m
United Airlines
Mon 23/206:00
ONT
-
LHR
1 stop20h 15m
United Airlines
Deal found 15/1£347
Tue 10/207:30
LHR
-
ONT
2 stops23h 23m
United Airlines
Tue 17/206:10
ONT
-
LHR
2 stops18h 15m
United Airlines
Deal found 13/1£348
Fri 27/209:30
LHR
-
ONT
2 stops18h 37m
United Airlines
Fri 6/323:59
ONT
-
LHR
2 stops22h 31m
United Airlines
Deal found 13/1£353
Tue 12/507:25
LHR
-
ONT
2 stops18h 22m
United Airlines
Sat 16/518:54
ONT
-
LHR
2 stops33h 26m
United Airlines
Deal found 15/1£358
Mon 27/409:30
LHR
-
ONT
2 stops20h 20m
United Airlines
Sat 9/505:05
ONT
-
LHR
1 stop23h 15m
United Airlines
Deal found 13/1£359
Sat 28/215:05
LHR
-
ONT
1 stop15h 32m
Virgin Atlantic
Sat 7/313:10
ONT
-
LHR
1 stop12h 50m
Virgin Atlantic
Deal found 14/1£360
Sat 28/208:30
LHR
-
ONT
2 stops21h 29m
United Airlines
Sat 7/313:40
ONT
-
LHR
1 stop14h 20m
United Airlines
Deal found 14/1£362
Sat 31/110:45
LHR
-
ONT
1 stop19h 03m
Virgin Atlantic
Wed 18/213:10
ONT
-
LHR
1 stop12h 50m
Virgin Atlantic
Deal found 13/1£363
Sat 31/110:45
LHR
-
ONT
1 stop19h 03m
Virgin Atlantic
Mon 16/207:30
ONT
-
LHR
1 stop19h 00m
Virgin Atlantic
Deal found 13/1£364
Sat 31/112:05
LHR
-
ONT
1 stop17h 53m
Multiple Airlines
Mon 16/205:00
ONT
-
LHR
2 stops18h 10m
Multiple Airlines
Deal found 13/1£368
Thu 19/210:05
LHR
-
ONT
1 stop15h 36m
United Airlines
Sun 22/213:50
ONT
-
LHR
1 stop14h 10m
United Airlines
Deal found 12/1£369
Thu 22/111:35
LHR
-
ONT
1 stop17h 23m
United Airlines
Wed 4/213:24
ONT
-
LHR
1 stop12h 16m
United Airlines
Deal found 14/1£370

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 16 January 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

Thu 12/2

09:30-22:57

2 stops21h 27m

Ontario

Mon 23/2

06:00-10:15

1 stop20h 15m

£347

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/3

09:30-20:50

2 stops19h 20m

Ontario

Wed 18/3

06:00-10:25

2 stops21h 25m

£348

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 27/2

09:30-20:07

2 stops18h 37m

Ontario

Fri 6/3

23:59-06:30

2 stops22h 31m

£353

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/3

10:05-17:41

1 stop15h 36m

Ontario

Sun 15/3

06:15-12:00

1 stop22h 45m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/2

10:05-17:55

1 stop15h 50m

Ontario

Wed 11/2

13:24-09:40

1 stop12h 16m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 23/2

13:45-19:54

1 stop14h 09m

Ontario

Mon 2/3

13:50-12:00

1 stop14h 10m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 27/1

10:05-17:43

1 stop15h 38m

Ontario

Sun 8/2

13:53-12:00

1 stop14h 07m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/3

10:05-17:41

1 stop15h 36m

Ontario

Sun 8/3

06:15-07:25

1 stop18h 10m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 12/2

10:05-17:41

1 stop15h 36m

Ontario

Thu 5/3

13:40-12:00

1 stop14h 20m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/2

10:05-17:43

1 stop15h 38m

Ontario

Tue 3/3

13:50-12:00

1 stop14h 10m

£371

Flights are sorted by cheapest return flights first.

Deals found on 13/1

Showing 1-10 of 22 results
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 9 January 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, February is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £329). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £396). 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 16 January 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
1,349 reviews
Check prices

Overall

7.6

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Comfort

7.4

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Finnair
7.6
Good
1,349 reviews
Finnair
7.6
Good
1,349 reviews
Check prices

Overall

7.6

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Comfort

7.4

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Virgin Atlantic
7.5
Good
678 reviews
Finnair
7.6
Good
1,349 reviews
Check prices

Overall

7.6

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Comfort

7.4

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
United Airlines
7.4
Good
9,163 reviews
Finnair
7.6
Good
1,349 reviews
Check prices

Overall

7.6

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Comfort

7.4

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Lufthansa
6.8
Okay
7,718 reviews
Finnair
7.6
Good
1,349 reviews
Check prices

Overall

7.6

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Comfort

7.4

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
British Airways
6.7
Okay
7,680 reviews
Finnair
7.6
Good
1,349 reviews
Check prices

Overall

7.6

Food

6.7

Entertainment

6.9

Boarding

7.7

Crew

8.2

Comfort

7.4

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.

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 21h 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 £280, 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 £370 and £375, respectively. Users have found that Finnair is 44% 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 £329). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £396). 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 16 January 2026.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£280Average£438FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£370Average£523FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£375Average£501FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£386Average£469FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£395Average£616FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£424Average£580FlexibilityNo 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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