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Heathrow

$261+ 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 11/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Nov 5 — Nov 121
1 adult
Tue 11/5
Tue 11/12
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The best prices from Ontario to London Heathrow are usually found in January or December, booked 52 days in advance, depart on a Wednesday or Thursday 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 October 31, 2024.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Popular in

July

Cheapest in

January

Round-trip from

$653
(United Airlines)

One-way from

$261
(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, 35% potential price rise
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Best time to find cheap flights, 20% 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 October 31, 2024.

This United Airlines deal was found by Cheapflights users on 10/30. 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.
Wed 12/46:10 amONT - LHR
1 stop17h 20mUnited Airlines
Thu 12/123:00 pmLHR - ONT
2 stops37h 47mUnited Airlines
Deal found 10/30$653
This KLM deal was found by Cheapflights users on 10/31. 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.
Wed 12/46:00 amONT - LHR
1 stop20h 00mKLM
Thu 12/126:30 amLHR - ONT
2 stops18h 24mKLM
Deal found 10/31$663
This Delta deal was found by Cheapflights users on 10/30. 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.
Mon 11/181:18 pmONT - LHR
1 stop12h 42mDelta
Wed 12/410:45 amLHR - ONT
1 stop13h 34mDelta
Deal found 10/30$666
This Air Canada deal was found by Cheapflights users on 10/30. 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.
Wed 12/45:05 amONT - LHR
2 stops18h 05mMultiple Airlines
Thu 12/1211:10 amLHR - ONT
2 stops20h 48mMultiple Airlines
Deal found 10/30$672
This Iberia deal was found by Cheapflights users on 10/31. 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.
Fri 11/1510:43 amONT - LHR
1 stop12h 37mIberia
Sun 12/81:50 pmLHR - ONT
1 stop16h 23mIberia
Deal found 10/31$776
This Netflights deal was found by Cheapflights users on 10/30. 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.
Wed 12/116:00 amONT - LHR
1 stop20h 00mVirgin Atlantic
Sun 12/1510:45 amLHR - ONT
1 stop13h 45mVirgin Atlantic
Deal found 10/30$796
This British Airways deal was found by Cheapflights users on 10/30. 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 11/2410:43 amONT - LHR
1 stop14h 57mBritish Airways
Fri 12/62:30 pmLHR - ONT
1 stop15h 33mBritish Airways
Deal found 10/30$810
This Air Canada deal was found by Cheapflights users on 10/31. 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.
Thu 11/145:05 amONT - LHR
2 stops18h 05mAir Canada
Mon 11/1811:10 amLHR - ONT
2 stops19h 13mAir Canada
Deal found 10/31$923

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 2,570,725 searches. Data last updated October 31, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 11/25

5:45 am-10:50 am

2 stops21h 05m

$261

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/19

6:00 am-10:00 am

1 stop20h 00m

$397

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 1/12

4:25 pm-1:20 pm

1 stop12h 55m

$405

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 12/8

12:11 pm-10:35 am

1 stop14h 24m

$409

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 12/11

7:16 am-6:20 am

1 stop15h 04m

$411

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/16

2:44 pm-12:05 pm

1 stop13h 21m

$459

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 1/19

5:10 am-7:10 am

2 stops18h 00m

$474

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 12/30

5:05 am-7:55 am

2 stops18h 50m

$477

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 3/25

7:45 am-12:50 pm

3 stops22h 05m

$660

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 11/23

6:00 am-10:00 am

1 stop20h 00m

$734

Flights are sorted by cheapest first

Deals found on 10/31

Showing 1-10 of 19 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 October.
ProviderPrice AccuracyTrust Score*Cancellation Policy
ExpediaPrice Accuracy1 starTrust Score*3 starsCancellation PolicyAirline Policy
AranGrantPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
eDreamsPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
FlightHubPrice Accuracy3 starsTrust Score*3 starsCancellation PolicyAirline Policy
KAYAKPrice Accuracy1 starTrust Score*3 starsCancellation PolicyAirline Policy

*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 October 25, 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.

Find deals

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 $649). 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 October 31, 2024.

It’s typically best to fly out from Ontario to London Heathrow Airport in the morning. Doing so could potentially save you 31% 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 October 27, 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.

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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 October 31, 2024.
See what other customers who have flown with Delta, United Airlines and KLM 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
8,835 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

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
8,835 reviews
Delta
8.0
Very good
8,835 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 10

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

KLM
7.8
Good
1,352 reviews
Delta
8.0
Very good
8,835 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 10

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

Virgin Atlantic
7.6
Good
666 reviews
Delta
8.0
Very good
8,835 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

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
9,240 reviews
Delta
8.0
Very good
8,835 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Reviews

1 / 10

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

WestJet
7.3
Good
2,804 reviews
Delta
8.0
Very good
8,835 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

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.

  • Can I find flights from Ontario to London Heathrow Airport for under $700 on Cheapflights?

    Yes, there are multiple flights from Ontario to London Heathrow Airport for under $700. The cheapest flight booked recently is on United Airlines for just $653, but on average you can expect to pay $693.

  • Are there last-minute flights available from Ontario to London Heathrow Airport for under $1,000?

    There are currently 7+ open flights from Ontario to London Heathrow Airport within the next 7 days for less than $1,000.

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

    According to our current data, United Airlines ($653), KLM ($663), and Delta ($666) offers the cheapest pricing from Ontario to London Heathrow Airport. United Airlines is 14% 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 $397. British Airways flights start at $405 while deals on KLM start at $409 one-way.

  • What does ONT to LHR mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Ontario Airport to London Heathrow Airport flight would often be abbreviated as a ONT to LHR flight.

  • Can I find deals for flights from Ontario to Heathrow that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to Heathrow flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to Heathrow with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Heathrow flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • 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.

  • Can I find deals for flights from Ontario to Heathrow that allow pets onboard?

    Many airlines flying from Ontario to Heathrow offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to Heathrow?

    Yes, you can often find last-minute deals on Ontario to Heathrow flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to London Heathrow Airport flight deals updated?

    The Ontario to London Heathrow Airport flight deals you see on this page were last updated on 10/31.

  • 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 $649). 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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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 2,570,725 searches. Data last updated October 31, 2024.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$455Average$628FlexibilityNo cancel feeOn-time72%
DeltaCheapest$482Average$686FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$597Average$800FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$602Average$794FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$619Average$805FlexibilityNo cancel feeOn-time69%
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