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Cheap flights from London Heathrow Airport to Ontario from £322

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
21 2월 — 28 2월1
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 22 1월 2026.

일 1/306:30
LHR
-
ONT
2 stops38h 08m
United Airlines
일 15/306:15
ONT
-
LHR
1 stop18h 10m
United Airlines
Deal found 21/1£346
토 7/311:30
LHR
-
ONT
2 stops19h 27m
United Airlines
토 14/313:40
ONT
-
LHR
1 stop34h 45m
United Airlines
Deal found 21/1£347
월 27/409:30
LHR
-
ONT
2 stops20h 20m
United Airlines
토 9/506:00
ONT
-
LHR
2 stops19h 40m
United Airlines
Deal found 20/1£358
목 29/108:30
LHR
-
ONT
2 stops21h 28m
United Airlines
수 11/205:05
ONT
-
LHR
2 stops16h 50m
United Airlines
Deal found 20/1£360
일 1/310:45
LHR
-
ONT
1 stop13h 17m
Virgin Atlantic
일 15/317:53
ONT
-
LHR
1 stop35h 02m
Virgin Atlantic
Deal found 21/1£362
토 21/208:30
LHR
-
ONT
2 stops36h 13m
United Airlines
토 14/318:37
ONT
-
LHR
1 stop29h 48m
United Airlines
Deal found 20/1£366
월 9/210:05
LHR
-
ONT
1 stop15h 38m
United Airlines
월 16/213:50
ONT
-
LHR
1 stop14h 10m
United Airlines
Deal found 19/1£369
목 19/310:25
LHR
-
ONT
1 stop18h 53m
United Airlines
목 26/313:50
ONT
-
LHR
1 stop12h 50m
United Airlines
Deal found 21/1£370

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 22 1월 2026.

Round-trip from

£346

One-way from

£322

Popular in

December

Cheapest in

January

Average price

£412
United Airlines
  • United Airlines
  • 1/3-15/3
  • 3 total stops
  • 56h 18m total
  • London to Ontario
Search Deals
United Airlines
  • United Airlines
  • 4/3
  • 2 total stops
  • 22h 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

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 22 1월 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

일 1/3

06:30-12:38

2 stops38h 08m

Ontario

일 15/3

06:15-07:25

1 stop18h 10m

£346

LondonOntario

LHR - ONT

LHRONT

London Heathrow

월 27/4

09:30-21:50

2 stops20h 20m

Ontario

토 9/5

06:00-12:20

2 stops22h 20m

£359

LondonOntario

LHR - ONT

LHRONT

London Heathrow

수 11/2

10:05-17:43

1 stop15h 38m

Ontario

수 18/2

13:50-12:00

1 stop14h 10m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

토 21/2

10:05-17:41

1 stop15h 36m

Ontario

토 28/2

13:53-12:00

1 stop14h 07m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

화 17/2

10:05-17:41

1 stop15h 36m

Ontario

화 10/3

13:50-09:40

1 stop12h 50m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

토 7/2

10:05-17:51

1 stop15h 46m

Ontario

수 11/2

13:53-12:00

1 stop14h 07m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

화 10/2

10:05-17:43

1 stop15h 38m

Ontario

화 17/2

13:50-12:00

1 stop14h 10m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

수 4/3

10:05-17:41

1 stop15h 36m

Ontario

수 25/3

13:50-09:40

1 stop12h 50m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

토 21/2

10:05-17:41

1 stop15h 36m

Ontario

화 17/3

13:40-12:00

1 stop15h 20m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

수 18/2

10:05-17:41

1 stop15h 36m

Ontario

수 11/3

13:40-12:00

1 stop15h 20m

£370

Flights are sorted by cheapest return flights first.

Deals found on 21/1

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 16 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, December is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £331). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £395). 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 22 1월 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
1,353 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Entertainment

6.9

Food

6.7

Boarding

7.7

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
1,353 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Entertainment

6.9

Food

6.7

Boarding

7.7

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
1,353 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Entertainment

6.9

Food

6.7

Boarding

7.7

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
9,191 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Entertainment

6.9

Food

6.7

Boarding

7.7

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
7,738 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Entertainment

6.9

Food

6.7

Boarding

7.7

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
7,689 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Entertainment

6.9

Food

6.7

Boarding

7.7

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 38h 08m. 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 £279, 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 £369 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, December is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £331). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £395). 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 22 1월 2026.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£279Average£438FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£369Average£522FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£375Average£500FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£386Average£474FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£394Average£615FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£423Average£579FlexibilityNo 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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