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Cheap flights from Ontario to London Heathrow Airport from £296

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 30/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
26 Feb — 5 Mar1
1 adult

Cheap flight deals from Ontario to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Heathrow (LHR). 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 21 February 2025.

Round-trip from

£482

One-way from

£296

Popular in

June

Cheapest in

April

Average price

£542
Iberia
  • Iberia
  • 26/3-9/4
  • 2 total stops
  • 28h 48m total
  • Ontario to London
JetBlue
  • JetBlue
  • 30/4
  • 1 total stop
  • 14h 05m total
  • Ontario to London
Highest demand for flights based on searches. 23% potential increase in price (£152 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease (£22 potential savings vs. average return price).
Average for round-trip flights in February 2025

Find flight deals from Ontario to Heathrow

Cheapest flights from Ontario to Heathrow
Explore the most affordable flight options available from Ontario to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.

Wed 26/310:57ONT - LHR
1 stop13h 23mIberia
Wed 9/416:25LHR - ONT
1 stop15h 25mIberia
Deal found 21/2£482
Wed 26/311:42ONT - LHR
1 stop16h 28mVirgin Atlantic
Wed 9/411:45LHR - ONT
2 stops20h 07mVirgin Atlantic
Deal found 21/2£492
Sun 23/310:57ONT - LHR
1 stop15h 43mMultiple Airlines
Wed 2/415:40LHR - ONT
1 stop14h 20mMultiple Airlines
Deal found 20/2£506
Thu 27/307:00ONT - LHR
1 stop16h 20mDelta
Thu 10/406:30LHR - ONT
2 stops18h 13mDelta
Deal found 19/2£508
Mon 10/313:30ONT - LHR
1 stop13h 30mKLM
Tue 18/312:30LHR - ONT
1 stop17h 13mKLM
Deal found 20/2£512
Thu 13/306:00ONT - LHR
2 stops18h 10mUnited Airlines
Thu 27/315:00LHR - ONT
2 stops36h 57mUnited Airlines
Deal found 20/2£517
Sat 15/323:59ONT - LHR
2 stops33h 01mBritish Airways
Thu 10/416:25LHR - ONT
1 stop15h 25mBritish Airways
Deal found 20/2£530
Sat 15/318:45ONT - LHR
1 stop29h 40mLufthansa
Thu 10/416:15LHR - ONT
1 stop14h 40mLufthansa
Deal found 20/2£531
Wed 2/413:20ONT - LHR
2 stops16h 00mAir Canada
Wed 9/410:15LHR - ONT
2 stops18h 06mAir Canada
Deal found 21/2£532
Thu 1/522:40ONT - LHR
1 stop14h 05mJetBlue
Tue 6/511:55LHR - ONT
1 stop17h 27mJetBlue
Deal found 20/2£597

Find flights from Ontario to Heathrow within your budget

Customise your flight search to find flights from Ontario to Heathrow 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 21 February 2025.

Fly from

Ontario

Fly to

Heathrow

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 26/3

10:57-07:20

1 stop13h 23m

London Heathrow

Wed 9/4

16:25-23:50

1 stop15h 25m

£482

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 26/3

11:42-11:10

1 stop16h 28m

London Heathrow

Wed 9/4

11:45-23:52

2 stops20h 07m

£492

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 23/3

10:57-09:40

1 stop15h 43m

London Heathrow

Wed 2/4

15:40-22:00

1 stop14h 20m

£506

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 27/3

07:00-06:20

1 stop16h 20m

London Heathrow

Thu 10/4

06:30-16:43

2 stops18h 13m

£508

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 10/3

13:30-10:00

1 stop13h 30m

London Heathrow

Tue 18/3

12:30-22:43

1 stop17h 13m

£512

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 13/3

06:00-07:10

2 stops18h 10m

London Heathrow

Thu 27/3

15:00-20:57

2 stops36h 57m

£517

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 15/3

23:59-16:00

2 stops33h 01m

London Heathrow

Thu 10/4

16:25-23:50

1 stop15h 25m

£530

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 15/3

18:45-07:25

1 stop29h 40m

London Heathrow

Thu 10/4

16:15-22:55

1 stop14h 40m

£531

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 2/4

13:20-13:20

2 stops16h 00m

London Heathrow

Wed 9/4

10:15-20:21

2 stops18h 06m

£532

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/5

22:40-20:45

1 stop14h 05m

London Heathrow

Tue 6/5

11:55-21:22

1 stop17h 27m

£597

Flights are sorted by cheapest return flights first.

Deals found on 21/2

Showing 1-10 of 23 results
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Best time to book a flight from Ontario to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Ontario 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.

Travel insights for flights from Ontario to Heathrow

Get recent, data-driven insights about flights from Ontario to Heathrow including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Ontario to London Heathrow Airport?

Use this chart to determine the optimal time to book a return flight from Ontario to Heathrow. Price data was last updated on 14 February 2025.

To ensure you get the cheapest price possible for a flight from Ontario to London Heathrow Airport, you should look to book at least 42 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 Ontario to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of £112). Flying from Ontario to London Heathrow Airport in August is currently the most expensive (average of £163). 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.

What is the cheapest time of day to fly from ONT to LHR?

Find hourly flight availability from Ontario to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 February 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to London Heathrow Airport as you normally would.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 21 February 2025.
Read reviews from past customers who have flown Delta, KLM and Virgin Atlantic from Ontario to London. 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.

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

8.0
Very Good

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Comfort

8.0

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Heathrow. 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 from for flights from Ontario to London Heathrow?

    Most people fly from Ontario (ONT) if they book a flight from Ontario to London Heathrow. On average, Ontario has 0 outbound flights to London Heathrow per day from 0 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • What are the cheapest airlines flying from Ontario to London Heathrow Airport round-trip?

    Cheapflights users have booked flights from Ontario to London Heathrow Airport round-trip from £482. Other airlines that can offer you cheap pricing are Virgin Atlantic, from £492, and Delta, from £508. Iberia is currently priced 25% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Ontario to London Heathrow Airport one-way?

    For one-way options, check prices for JetBlue. According to our data, you can fly for as low as £296. Users have also found prices from £322 and £326 on WestJet and KLM, respectively.

  • Can I find deals for flights from Ontario to Heathrow that include hotel bookings?

    Yes. In addition to deals on Ontario to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Heathrow.

  • Can I find deals for business class flights from Ontario to Heathrow?

    Yes. Cheapflights offers flight deals from Ontario to Heathrow 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 Ontario to London Heathrow Airport?

    Currently, January is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of £112). Flying from Ontario to London Heathrow Airport in August is currently the most expensive (average of £163). 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

Travelling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Deal
Hounslow
Milton Keynes
Croydon
Gatwick
Slough
Luton
Ilford
Hayes
Eastbourne
Swindon
Northampton
Wembley
Southend-on-Sea
Ipswich
Winchester
Maidstone
Crawley
Southall
Watford

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It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ontario to Heathrow.

Can Cheapflights find flights from Ontario to Heathrow with no change fees?

Certainly. Search results for flights to Heathrow from Ontario shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Ontario to Heathrow become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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