Cheap flights from London to Ontario from £392
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/8. Fares are subject to change and may not be available on all flights or dates of travel.
Cheapflights Tip: The best prices from London to Ontario are usually found in February or January, booked 77 days in advance, depart on a Wednesday or Tuesday and return on a Monday
Cheap flight deals from London to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Ontario (ONT). 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 8 July 2025.
Round-trip from | £392 |
---|---|
Popular in | August |
Cheapest in | February |
Average price | £764 |
Find flight deals from London to Ontario
Cheapest flights from London to OntarioExplore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 July 2025.
Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 July 2025.
Cheapflights Fare Finder
Customise your flight search to find flights from London to Ontario 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 8 July 2025.
Use the filters below to find and compare flights from London to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Sun 24/8
10:55-23:40
1 stop20h 45m
Ontario
Tue 9/9
11:40-14:15
1 stop18h 35m
LondonOntario
LGW - ONT
LGWONT
London Gatwick
Thu 28/8
15:05-11:32
2 stops28h 27m
Ontario
Wed 10/9
06:10-08:10
2 stops18h 00m
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Sun 24/8
10:55-23:40
1 stop20h 45m
Ontario
Tue 9/9
06:05-06:25
2 stops40h 20m
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Sun 31/8
15:10-22:14
1 stop15h 04m
Ontario
Sat 13/9
14:54-12:45
1 stop13h 51m
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Fri 26/9
12:00-18:54
1 stop14h 54m
Ontario
Wed 8/10
16:49-12:50
1 stop12h 01m
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Mon 24/11
19:05-09:28
2 stops22h 23m
Ontario
Fri 5/12
10:57-10:00
1 stop15h 03m
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Tue 25/11
06:30-22:41
2 stops24h 11m
Ontario
Fri 5/12
06:00-12:15
2 stops22h 15m
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Mon 1/9
15:40-21:39
1 stop13h 59m
Ontario
Wed 17/9
16:45-12:50
1 stop12h 05m
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Wed 3/9
12:00-18:54
1 stop14h 54m
Ontario
Tue 9/9
12:45-10:50
1 stop14h 05m
LondonOntario
LCY - ONT
LCYONT
London City
Sun 10/8
16:20-11:52
2 stops51h 32m
Ontario
Thu 21/8
10:50-14:25
2 stops19h 35m
Best time to book a flight from London to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from London with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from London to Ontario
How far ahead should I book a flight from London to Ontario?
Use this chart to determine the optimal time to book a return flight from London to Ontario. Price data was last updated on 27 June 2025.
To ensure you get the cheapest price possible for a flight from London to Ontario, you should look to book at least 77 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 London to Ontario?
Currently, March is the cheapest month in which you can book a flight from London to Ontario (average of £516). Flying from London to Ontario in August is currently the most expensive (average of £827). 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 LON to ONT?
Find hourly flight availability from London to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 8 July 2025.
It’s optimal to fly from London to Ontario in the evening. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight at midday.
How much does it cost for a return flight from London to Ontario?
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated 8 July 2025.
Read through reviews of airlines operating flights from London to Ontario, such as Delta, KLM, andFinnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
Boarding
Crew
Entertainment
Comfort
Food
Reviews
Aaron,Oct 2024
TUS - LAX
Overall
Boarding
Crew
Entertainment
Comfort
Food
Reviews
Aaron,Oct 2024
TUS - LAX
Overall
Boarding
Crew
Entertainment
Comfort
Food
Reviews
Aaron,Oct 2024
TUS - LAX
Overall
Boarding
Crew
Entertainment
Comfort
Food
Reviews
Aaron,Oct 2024
TUS - LAX
Overall
Boarding
Crew
Entertainment
Comfort
Food
Reviews
Aaron,Oct 2024
TUS - LAX
Overall
Boarding
Crew
Entertainment
Comfort
Food
Reviews
Aaron,Oct 2024
TUS - LAX
Related info for your journey
Find useful and relevant information for your journey from London to Ontario. 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 London to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from London to Ontario
Discover the top 6 airlines that operate flights from London to Ontario. 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 858,174 searches. Data last updated 8 July 2025.
Fly with Cheapflights
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from London to Ontario?
When you search for this flight from London to Ontario, 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 London to Ontario?
Cheapflights helps you find that perfect flight to Ontario from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!
Can Cheapflights find flights from London to Ontario with no change fees?
Cheapflights does show flights with no change fees to all users. To see these options for flights from London to Ontario, users can toggle the no change fees filter when performing a flight search.
Can Cheapflights notify me if prices for flights from London to Ontario become cheaper?
Yes, Cheapflights offers price alerts on London to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.