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$262+ Cheap flights from Ontario (ONT) to Heathrow (LHR)

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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Nov 25 — Dec 21
Mon 11/25
Mon 12/2
1 adult, Economy
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The best prices from Ontario to London Heathrow are usually found in April or March, booked 52 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

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 November 20, 2024.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Popular in

July

Cheapest in

April

Round-trip from

$654
(Booking.com)

One-way from

$262
(Trip.com)
Provider with most accurate pricing for Ontario-London Heathrow flight deals.
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Provider most trusted by Cheapflights users for Ontario-London Heathrow flights.
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High demand for flights, 30% potential price rise
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Best time to find cheap flights, 16% potential price drop
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From Ontario to London Heathrow
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One-way flight from Ontario to London Heathrow
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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 November 20, 2024.

This Delta deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/46:00 amONT - LHR
1 stop20h 00mDelta
Thu 12/126:30 amLHR - ONT
2 stops24h 32mDelta
Deal found 11/20$659
This British Airways deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/87:16 amONT - LHR
1 stop16h 04mBritish Airways
Wed 12/259:25 amLHR - ONT
1 stop21h 03mBritish Airways
Deal found 11/19$670
This KLM deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/912:11 pmONT - LHR
1 stop14h 24mKLM
Fri 1/1712:30 pmLHR - ONT
1 stop18h 22mKLM
Deal found 11/19$674
This Iberia deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/410:43 amONT - LHR
1 stop12h 37mIberia
Fri 2/141:50 pmLHR - ONT
1 stop16h 10mIberia
Deal found 11/19$675
This Virgin Atlantic deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2412:55 pmONT - LHR
2 stops15h 45mVirgin Atlantic
Sun 1/1210:45 amLHR - ONT
1 stop13h 43mVirgin Atlantic
Deal found 11/20$873
This United Airlines deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/301:57 pmONT - LHR
1 stop14h 03mUnited Airlines
Tue 1/1410:05 amLHR - ONT
1 stop15h 59mUnited Airlines
Deal found 11/20$1,004
This Netflights deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/2812:30 pmONT - LHR
1 stop14h 05mMultiple Airlines
Sun 12/2910:45 amLHR - ONT
1 stop21h 43mMultiple Airlines
Deal found 11/20$1,027
This Air Canada deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/36:00 amONT - LHR
2 stops20h 10mAir Canada
Tue 12/103:00 pmLHR - ONT
2 stops37h 47mAir Canada
Deal found 11/19$1,128
This Air France deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/912:11 pmONT - LHR
2 stops16h 29mAir France
Fri 12/204:10 pmLHR - ONT
2 stops32h 08mAir France
Deal found 11/19$1,253

Find flights from Ontario to Heathrow within your budget

Customize 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 2,629,791 searches. Data last updated November 20, 2024.

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Fly to

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Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 2/19

6:05 am-6:20 am

1 stop16h 15m

London Heathrow

Wed 2/26

7:25 am-10:00 pm

2 stops22h 35m

$654

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 2/19

6:00 am-12:40 pm

1 stop22h 40m

London Heathrow

Wed 2/26

1:15 pm-10:32 pm

1 stop17h 17m

$658

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 12/4

6:00 am-10:00 am

1 stop20h 00m

London Heathrow

Thu 12/12

6:30 am-11:02 pm

2 stops24h 32m

$659

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 12/9

12:11 pm-10:35 am

1 stop14h 24m

London Heathrow

Fri 1/17

12:30 pm-10:52 pm

1 stop18h 22m

$674

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 12/4

10:43 am-7:20 am

1 stop12h 37m

London Heathrow

Fri 2/14

1:50 pm-10:00 pm

1 stop16h 10m

$675

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 1/18

12:48 pm-1:20 pm

1 stop16h 32m

London Heathrow

Sun 1/26

10:40 am-6:37 pm

1 stop15h 57m

$774

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 2/19

6:00 am-11:15 am

3 stops21h 15m

London Heathrow

Wed 2/26

9:30 am-8:40 pm

2 stops19h 10m

$954

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 3/27

1:40 pm-7:10 am

2 stops34h 30m

London Heathrow

Fri 4/11

2:10 pm-6:00 pm

2 stops35h 50m

$1,008

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/8

7:00 am-7:55 am

1 stop16h 55m

London Heathrow

Tue 1/14

6:20 am-4:28 pm

2 stops18h 08m

$1,085

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 2/16

12:59 am-10:50 am

2 stops25h 51m

$262

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 20 results
1
2

Compare providers for flights from Ontario to Heathrow

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Heathrow in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
KAYAKPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-London Heathrow Airport flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Ontario-London Heathrow Airport flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Ontario-London Heathrow Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-London Heathrow Airport flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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 round-trip flight from Ontario to Heathrow. Price data was last updated on November 15, 2024.

The price you pay for your flight from Ontario to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 52 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Ontario to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of $648). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of $1,089). 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 November 20, 2024.

It’s typically best to fly out from Ontario to London Heathrow Airport in the morning. Doing so could potentially save you 29% on the flight price compared to flying in the evening, which is usually more expensive.

What is the cheapest day to fly from Ontario to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Heathrow. Price data was last updated on November 18, 2024.

Travelers seeking maximum savings on their Ontario to London Heathrow Airport flight should consider departing on Tuesday mornings when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 November 20, 2024.
See what other customers who have flown with Delta, KLM and Iberia from Ontario to London have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,756 reviews

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

Delta
8.0
Very good
8,756 reviews
Delta
8.0
Very good
8,756 reviews

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

KLM
7.8
Good
1,350 reviews
Delta
8.0
Very good
8,756 reviews

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

Virgin Atlantic
7.5
Good
663 reviews
Delta
8.0
Very good
8,756 reviews

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

United Airlines
7.4
Good
9,171 reviews
Delta
8.0
Very good
8,756 reviews

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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

WestJet
7.3
Good
2,811 reviews
Delta
8.0
Very good
8,756 reviews

Crew

8.5

Overall

8.0

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Reviews

1 / 10

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?

    If you book a flight to London Heathrow from Ontario, you will be flying from 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 Ontario to London Heathrow per day from 5 different airlines.

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

    According to our current data, British Airways ($654), Virgin Atlantic ($658), and Delta ($659) offers the cheapest pricing from Ontario to London Heathrow Airport. British Airways is 15% cheaper than the average price of flights available within the next 90 days to this destination.

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

    To fly one-way, consider booking your trip with Virgin Atlantic, which is currently one of the cheapest options available, starting at $399. British Airways flights start at $406 while deals on KLM start at $409 one-way.

  • 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 vacation 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, November is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of $648). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of $1,089). 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.

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Alternative routes for Ontario to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to Heathrow

Discover the top 5 airlines that operate flights from Ontario to Heathrow. 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 2,629,791 searches. Data last updated November 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$455Average$629FlexibilityNo cancel feeOn-time72%
DeltaCheapest$482Average$691FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$602Average$824FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$612Average$850FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$619Average$796FlexibilityNo cancel feeOn-time69%
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