Cheap flights from Ontario to London Heathrow Airport from £304
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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
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 March 2025.
Round-trip from | £474 |
---|---|
One-way from | £304 |
Popular in | June |
Cheapest in | April |
Average price | £511 |
Find flight deals from Ontario to Heathrow
Cheapest flights from Ontario to HeathrowExplore 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 March 2025.
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 March 2025.
Cheapflights Fare Finder
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 March 2025.
Use the filters below to find and compare flights from Ontario to London Heathrow Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Tue 1/4
10:57-09:00
1 stop14h 03m
London Heathrow
Tue 29/4
06:10-22:10
2 stops24h 00m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 6/4
16:35-12:50
1 stop12h 15m
London Heathrow
Tue 22/4
15:40-21:58
1 stop14h 18m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 6/4
07:00-07:15
1 stop16h 15m
London Heathrow
Tue 22/4
13:25-22:43
1 stop17h 18m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 27/4
12:07-13:30
1 stop17h 23m
London Heathrow
Fri 9/5
11:20-22:29
1 stop19h 09m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Mon 11/8
17:00-12:50
1 stop11h 50m
London Heathrow
Wed 27/8
11:15-17:48
1 stop14h 33m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Fri 2/5
18:48-06:30
2 stops51h 42m
London Heathrow
Wed 14/5
07:30-20:34
2 stops21h 04m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Thu 1/5
14:35-14:15
1 stop15h 40m
London Heathrow
Wed 7/5
11:00-23:42
1 stop20h 42m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Thu 1/5
05:05-10:00
2 stops44h 55m
London Heathrow
Wed 7/5
14:05-12:38
2 stops30h 33m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Tue 13/5
13:10-09:50
1 stop12h 40m
London Heathrow
Fri 7/11
11:00-17:22
1 stop14h 22m
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sat 3/5
22:40-20:45
1 stop14h 05m
London Heathrow
Thu 8/5
08:15-21:22
1 stop21h 07m
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.
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 return flight from Ontario to Heathrow. Price data was last updated on 14 March 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 49 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 £164). 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 March 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 March 2025.
Read reviews from past customers who have flown Delta, KLM and Air France 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.
Overall
Boarding
Food
Comfort
Crew
Entertainment
Reviews
Aaron,Oct 2024
LAX - LHR
Overall
Boarding
Food
Comfort
Crew
Entertainment
Reviews
Aaron,Oct 2024
LAX - LHR
Overall
Boarding
Food
Comfort
Crew
Entertainment
Reviews
Aaron,Oct 2024
LAX - LHR
Overall
Boarding
Food
Comfort
Crew
Entertainment
Reviews
Aaron,Oct 2024
LAX - LHR
Overall
Boarding
Food
Comfort
Crew
Entertainment
Reviews
Aaron,Oct 2024
LAX - LHR
Overall
Boarding
Food
Comfort
Crew
Entertainment
Reviews
Aaron,Oct 2024
LAX - LHR
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.
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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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How does Cheapflights help users find flights from Ontario to Heathrow?
When you search for this flight from Ontario to Heathrow, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.
Why should you use Cheapflights to find cheap flight tickets from Ontario to Heathrow?
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!