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Heathrow

$367+ 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 4/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Apr 16 — Apr 231
Wed 4/16
Wed 4/23
1 adult, Economy
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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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Cheapflights Tip: The best prices from Ontario to London Heathrow are usually found in March or February, booked 10 days in advance, depart on a Wednesday or Sunday 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 April 11, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$602
(Iberia)

One-way from

$367
(Ticket)

Popular in

June

Cheapest in

March

Average price

$676
Provider with most accurate pricing for Ontario-London Heathrow flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-London Heathrow flights.
Search Deals
From Ontario to London Heathrow
Search Deals
One-way flight from Ontario to London Heathrow
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($236 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 11, 2025.

This Iberia deal was found by Cheapflights users on 4/10. 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.
Thu 4/2410:54 amONT - LHR
1 stop15h 56mIberia
Sun 4/273:10 pmLHR - ONT
1 stop15h 00mIberia
Deal found 4/10$602
This Sembo deal was found by Cheapflights users on 4/11. 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 Sembo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/27:00 amONT - LHR
1 stop22h 30mVirgin Atlantic
Sun 5/186:30 pmLHR - ONT
1 stop36h 05mVirgin Atlantic
Deal found 4/11$625
This Delta deal was found by Cheapflights users on 4/10. 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.
Thu 4/245:45 amONT - LHR
1 stop21h 35mDelta
Sun 4/276:15 amLHR - ONT
2 stops18h 18mDelta
Deal found 4/10$626
This American Airlines deal was found by Cheapflights users on 4/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/24:35 pmONT - LHR
1 stop12h 15mAmerican Airlines
Fri 5/163:40 pmLHR - ONT
1 stop14h 17mAmerican Airlines
Deal found 4/10$629
This Air France deal was found by Cheapflights users on 4/10. 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 10/2712:00 pmONT - LHR
1 stop16h 40mAir France
Thu 11/139:20 amLHR - ONT
1 stop21h 21mAir France
Deal found 4/10$634
This oojo deal was found by Cheapflights users on 4/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/172:44 pmONT - LHR
1 stop14h 01mBritish Airways
Wed 4/303:10 pmLHR - ONT
1 stop15h 00mBritish Airways
Deal found 4/10$641
This Booking.com deal was found by Cheapflights users on 4/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/85:05 amONT - LHR
2 stops22h 45mAir Canada
Thu 5/159:30 amLHR - ONT
2 stops43h 23mAir Canada
Deal found 4/10$667
This United Airlines deal was found by Cheapflights users on 4/10. 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.
Thu 4/241:35 pmONT - LHR
1 stop12h 05mUnited Airlines
Mon 4/289:30 amLHR - ONT
2 stops19h 12mUnited Airlines
Deal found 4/10$671
This The Travel House deal was found by Cheapflights users on 4/10. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/121:10 pmONT - LHR
1 stop12h 40mKLM
Wed 5/2111:00 amLHR - ONT
1 stop13h 17mKLM
Deal found 4/10$689
This Air Canada deal was found by Cheapflights users on 4/10. 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 10/211:15 pmONT - LHR
2 stops14h 35mMultiple Airlines
Fri 10/316:00 pmLHR - ONT
2 stops27h 41mMultiple Airlines
Deal found 4/10$697
This JetBlue deal was found by Cheapflights users on 4/10. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/310:40 pmONT - LHR
1 stop14h 05mJetBlue
Mon 5/198:15 amLHR - ONT
1 stop20h 56mJetBlue
Deal found 4/10$741
This The Travel House deal was found by Cheapflights users on 4/11. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1611:00 pmONT - LHR
1 stop13h 45mIcelandair
Tue 10/148:15 amLHR - ONT
1 stop21h 26mIcelandair
Deal found 4/11$814

Cheapflights Fare Finder

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 2,558,603 searches. Data last updated April 11, 2025.
Use the filters below to find and compare flights from Ontario to London Heathrow Airport that are best for you.

Fly from

Ontario

Fly to

Heathrow

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 4/24

10:54 am-2:25 pm

1 stop19h 31m

London Heathrow

Wed 4/30

4:25 pm-11:50 pm

1 stop15h 25m

$602

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 5/2

7:00 am-1:30 pm

1 stop22h 30m

London Heathrow

Sun 5/18

6:30 pm-10:35 pm

1 stop36h 05m

$625

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 9/25

2:00 pm-2:15 pm

1 stop16h 15m

London Heathrow

Wed 10/8

6:15 am-5:17 pm

2 stops19h 02m

$627

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 5/2

4:35 pm-12:50 pm

1 stop12h 15m

London Heathrow

Fri 5/16

3:40 pm-9:57 pm

1 stop14h 17m

$629

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 5/2

4:35 pm-2:40 pm

1 stop14h 05m

London Heathrow

Sun 5/18

3:40 pm-9:57 pm

1 stop14h 17m

$645

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 5/8

5:05 am-11:50 am

2 stops22h 45m

London Heathrow

Thu 5/15

9:30 am-8:53 pm

2 stops43h 23m

$667

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 4/24

1:35 pm-9:40 am

1 stop12h 05m

London Heathrow

Mon 4/28

9:30 am-8:42 pm

2 stops19h 12m

$671

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 5/12

1:10 pm-9:50 am

1 stop12h 40m

London Heathrow

Wed 5/21

11:00 am-4:17 pm

1 stop13h 17m

$689

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 5/3

10:40 pm-8:45 pm

1 stop14h 05m

London Heathrow

Mon 5/19

8:15 am-9:11 pm

1 stop20h 56m

$741

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 9/11

6:04 am-6:35 am

2 stops16h 31m

London Heathrow

Fri 9/19

9:30 am-9:56 pm

3 stops20h 26m

$772

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/10

Showing 1-10 of 25 results
1
2
3

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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to London Heathrow Airport

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 April 4, 2025.

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 10 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 $661). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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 April 11, 2025.

It’s typically best to fly out from Ontario to London Heathrow Airport in the morning. Doing so could potentially save you 32% 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 December 16, 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. Thursday afternoons 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 April 11, 2025.
See what other customers who have flown with China Airlines, Delta 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.
China Airlines
8.2
Very good
729 reviews

Overall

8.2

Comfort

8.0

Crew

8.5

Food

7.8

Entertainment

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
China Airlines
8.2
Very good
729 reviews
China Airlines
8.2
Very good
729 reviews

Overall

8.2

Comfort

8.0

Crew

8.5

Food

7.8

Entertainment

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Delta
8.0
Very good
7,911 reviews
China Airlines
8.2
Very good
729 reviews

Overall

8.2

Comfort

8.0

Crew

8.5

Food

7.8

Entertainment

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
KLM
7.8
Good
1,321 reviews
China Airlines
8.2
Very good
729 reviews

Overall

8.2

Comfort

8.0

Crew

8.5

Food

7.8

Entertainment

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
Air France
7.4
Good
1,428 reviews
China Airlines
8.2
Very good
729 reviews

Overall

8.2

Comfort

8.0

Crew

8.5

Food

7.8

Entertainment

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver
United Airlines
7.4
Good
8,636 reviews
China Airlines
8.2
Very good
729 reviews

Overall

8.2

Comfort

8.0

Crew

8.5

Food

7.8

Entertainment

8.0

Boarding

8.3

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2025

YVR - TPE

I like the system, but the problem is the food , thre is no option, as a chef i don't recommend the food is worst we keep our hungry until taipe from vancouver

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 6 different airlines.

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

    According to our current data, Iberia ($602), Virgin Atlantic ($625), and Delta ($626) offers the cheapest pricing from Ontario to London Heathrow Airport. Iberia is 26% 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 Air France, which is currently one of the cheapest options available, starting at $367. Iberia flights start at $384 while deals on Virgin Atlantic start at $387 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 $661). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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

Traveling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Luton
Horley
Wembley
Canterbury
Harrow
Dover
Gatwick
Orpington
Watford
Milton Keynes
Northampton
Stratford-upon-Avon
Croydon
Borehamwood
Folkestone
Ilford
Broadway

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Top 6 airlines flying from Ontario to Heathrow

Discover the top 6 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 2,558,603 searches. Data last updated April 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest$454Average$884FlexibilityNo cancel feeOn-time72%
IberiaCheapest$582Average$663FlexibilityNo cancel feeOn-time77%
DeltaCheapest$598Average$777FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$629Average$764FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$629Average$900FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$648Average$822FlexibilityNo cancel feeOn-time70%

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