This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/4. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ONT
22 Jan — 29 Jan1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Ontario are usually found in January or September, booked 81 days in advance, depart on a Wednesday or Tuesday and return on a Monday
Cheap flight deals from London to Ontario
Enter your travel dates to find the best prices.
Cheapest flights from London to Ontario
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 23 December 2025.
Fri 26/1208:55LHR - ONT
1 stop22h 28mMultiple Airlines
Sun 18/112:41ONT - LHR
1 stop14h 59mMultiple Airlines
Deal found 21/12£578
Fri 26/1212:20LHR - ONT
1 stop18h 29mDelta
Wed 21/113:11ONT - LHR
1 stop12h 49mDelta
Deal found 22/12£588
Mon 29/1207:30LHR - ONT
2 stops22h 44mBritish Airways
Wed 4/216:45ONT - LHR
1 stop12h 30mBritish Airways
Deal found 21/12£592
Wed 31/1207:35LHR - ONT
2 stops38h 17mBritish Airways
Sun 1/206:00ONT - LHR
1 stop16h 50mBritish Airways
Deal found 22/12£593
Wed 31/1207:35LHR - ONT
2 stops38h 17mBritish Airways
Wed 21/110:58ONT - LHR
1 stop13h 37mBritish Airways
Deal found 22/12£594
Mon 29/1210:05LHR - ONT
1 stop15h 38mUnited Airlines
Sun 18/113:24ONT - LHR
1 stop12h 16mUnited Airlines
Deal found 22/12£596
Wed 31/1210:05LHR - ONT
1 stop16h 11mBritish Airways
Sat 31/115:09ONT - LHR
1 stop13h 06mBritish Airways
Deal found 22/12£606
Fri 26/1212:20LHR - ONT
1 stop18h 29mMultiple Airlines
Sat 17/112:41ONT - LHR
1 stop14h 59mMultiple Airlines
Deal found 21/12£615
Fri 26/1212:20LHR - ONT
1 stop18h 29mMultiple Airlines
Fri 16/122:30ONT - LHR
1 stop29h 10mMultiple Airlines
Deal found 21/12£620
Sun 28/1219:15LCY - ONT
2 stops34h 59mBritish Airways
Sun 11/107:16ONT - LCY
2 stops41h 34mBritish Airways
Deal found 21/12£666
Fri 26/1219:15LCY - ONT
2 stops34h 59mBritish Airways
Sun 28/1223:59ONT - LCY
2 stops30h 36mBritish Airways
Deal found 22/12£965
Tue 23/1219:15LCY - ONT
2 stops50h 37mBritish Airways
Sun 28/1214:42ONT - LCY
2 stops39h 53mBritish Airways
Deal found 21/12£1,192
Best flights from London to Ontario
Discover carefully curated flight deals from London to Ontario that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 23 December 2025.
Tue 14/414:25LHR - ONT
1 stop17h 15mAmerican Airlines
Tue 21/406:43ONT - LHR
1 stop15h 37mAmerican Airlines
Deal found 22/12£306
Mon 12/120:25LHR - ONT
2 stops27h 47mVirgin Atlantic
Tue 31/306:00ONT - LHR
1 stop22h 10mVirgin Atlantic
Deal found 21/12£368
Mon 12/108:55LHR - ONT
1 stop20h 10mDelta
Mon 26/112:41ONT - LHR
1 stop14h 59mDelta
Deal found 22/12£380
Thu 22/107:30LHR - ONT
2 stops22h 28mUnited Airlines
Mon 26/113:53ONT - LHR
1 stop33h 32mUnited Airlines
Deal found 20/12£380
Thu 5/207:50LCY - ONT
2 stops22h 58mIberia
Thu 12/207:10ONT - LCY
2 stops17h 40mIberia
Deal found 22/12£542
Sun 12/408:20LHR - ONT
1 stop17h 25mAmerican Airlines
Wed 22/412:55ONT - LHR
1 stop15h 15mAmerican Airlines
Deal found 22/12£306
Sat 11/414:25LHR - ONT
1 stop15h 31mAmerican Airlines
Sat 25/406:00ONT - LHR
1 stop18h 05mAmerican Airlines
Deal found 22/12£306
Wed 15/414:25LHR - ONT
1 stop15h 31mAmerican Airlines
Fri 24/411:01ONT - LHR
1 stop13h 04mAmerican Airlines
Deal found 22/12£306
Mon 19/111:55LGW - ONT
2 stops20h 01mMultiple Airlines
Mon 26/106:30ONT - LGW
2 stops20h 25mMultiple Airlines
Deal found 21/12£832
Mon 19/119:40LGW - ONT
2 stops22h 28mIberia
Mon 9/210:58ONT - LGW
2 stops24h 02mIberia
Deal found 22/12£559
Fri 1/507:00LGW - ONT
2 stops24h 59mMultiple Airlines
Sun 10/523:25ONT - LGW
2 stops32h 55mMultiple Airlines
Deal found 21/12£1,102
Mon 23/319:15LCY - ONT
2 stops25h 42mIberia
Mon 13/411:01ONT - LCY
2 stops18h 19mIberia
Deal found 22/12£1,070
Thu 5/211:55LGW - ONT
2 stops20h 01mMultiple Airlines
Thu 12/206:14ONT - LGW
2 stops20h 41mMultiple Airlines
Deal found 22/12£1,112
Mon 23/319:40LGW - ONT
2 stops25h 17mIberia
Mon 13/415:05ONT - LGW
2 stops20h 55mIberia
Deal found 22/12£1,112
Thu 11/613:00LGW - ONT
2 stops17h 35mMultiple Airlines
Tue 23/613:20ONT - LGW
2 stops17h 20mMultiple Airlines
Deal found 21/12£1,253
Mon 12/111:55LGW - ONT
2 stops20h 01mMultiple Airlines
Tue 31/310:59ONT - LGW
2 stops19h 41mMultiple Airlines
Deal found 21/12£1,377
Fri 27/211:55LGW - ONT
2 stops19h 40mMultiple Airlines
Wed 25/306:00ONT - LGW
2 stops21h 55mMultiple Airlines
Deal found 22/12£3,928
Last-minute flights from London to Ontario
Discover last-minute flight deals from London to Ontario. Data last updated 23 December 2025 and is based on user searches.
Tue 23/1219:15LCY - ONT
2 stops50h 37mBritish Airways
Sun 28/1214:42ONT - LCY
2 stops39h 53mBritish Airways
Deal found 21/12£1,192
Fri 26/1219:15LCY - ONT
2 stops34h 59mBritish Airways
Sun 28/1223:59ONT - LCY
2 stops30h 36mBritish Airways
Deal found 22/12£965
Fri 26/1219:15LCY - ONT
2 stops33h 43mBritish Airways
Sun 4/123:59ONT - LCY
2 stops30h 36mBritish Airways
Deal found 21/12£1,295
Sun 28/1219:15LCY - ONT
2 stops34h 59mBritish Airways
Sun 11/107:16ONT - LCY
2 stops41h 34mBritish Airways
Deal found 21/12£666
Thu 8/110:45LHR - ONT
1 stop19h 53mDelta
Sat 17/112:41ONT - LHR
1 stop14h 59mDelta
Deal found 21/12£384
Mon 12/120:25LHR - ONT
2 stops27h 47mVirgin Atlantic
Tue 31/313:20ONT - LHR
2 stops16h 55mVirgin Atlantic
Deal found 21/12£368
Mon 12/108:55LHR - ONT
1 stop20h 10mDelta
Mon 26/112:41ONT - LHR
1 stop14h 59mDelta
Deal found 22/12£380
Tue 13/110:45LHR - ONT
1 stop13h 27mDelta
Thu 29/112:41ONT - LHR
1 stop14h 59mDelta
Deal found 22/12£377
Mon 19/119:40LGW - ONT
2 stops22h 28mIberia
Mon 9/210:58ONT - LGW
2 stops24h 02mIberia
Deal found 22/12£559
Mon 19/111:55LGW - ONT
2 stops20h 01mMultiple Airlines
Mon 26/106:30ONT - LGW
2 stops20h 25mMultiple Airlines
Deal found 21/12£832
Thu 22/107:30LHR - ONT
2 stops22h 28mUnited Airlines
Mon 26/106:00ONT - LHR
2 stops16h 20mUnited Airlines
Deal found 21/12£385
Thu 22/108:20LHR - ONT
1 stop22h 28mBritish Airways
Mon 26/115:09ONT - LHR
1 stop13h 06mBritish Airways
Deal found 21/12£398
One-way flights from London to Ontario
Search for one-way flight options from London to Ontario. Find affordable one-way fares based on user searches. Data last updated 23 December 2025.
Mon 9/218:45LHR - ONT
2 stops32h 00mBritish Airways
Deal found 21/12£310
Wed 11/206:15LHR - ONT
2 stops24h 33mBritish Airways
Deal found 21/12£319
Mon 9/213:30LHR - ONT
2 stops17h 23mUnited Airlines
Deal found 22/12£321
Tue 10/210:35LHR - ONT
1 stop20h 13mMultiple Airlines
Deal found 22/12£326
Tue 21/410:05LHR - ONT
1 stop15h 40mBritish Airways
Deal found 20/12£327
Tue 28/406:55LHR - ONT
2 stops21h 41mUnited Airlines
Deal found 20/12£332
Tue 28/410:05LHR - ONT
1 stop15h 40mBritish Airways
Deal found 20/12£340
Mon 27/410:05LHR - ONT
1 stop15h 41mBritish Airways
Deal found 20/12£342
Wed 29/409:55LHR - ONT
2 stops21h 49mDelta
Deal found 20/12£342
Mon 2/210:00LHR - ONT
1 stop19h 58mUnited Airlines
Deal found 21/12£344
Mon 27/417:40LHR - ONT
2 stops34h 56mAir Canada
Deal found 20/12£347
Tue 28/410:00LCY - ONT
2 stops18h 58mDelta
Deal found 20/12£349
Find 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 23 December 2025.
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 23 December 2025.
Use the filters below to find and compare flights from London to Ontario that are best for you.
Fly from
London
Fly to
Ontario
Route
Depart
Return
Price
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Tue 14/4
14:25-23:40
1 stop17h 15m
Ontario
Tue 21/4
06:43-06:20
1 stop15h 37m
£306
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Sun 12/4
08:20-17:45
1 stop17h 25m
Ontario
Wed 22/4
12:55-12:10
1 stop15h 15m
£306
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Sat 11/4
14:25-21:56
1 stop15h 31m
Ontario
Sat 25/4
06:00-08:05
1 stop18h 05m
£306
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Wed 15/4
14:25-21:56
1 stop15h 31m
Ontario
Fri 24/4
11:01-08:05
1 stop13h 04m
£306
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Mon 12/1
20:25-16:12
2 stops27h 47m
Ontario
Tue 31/3
06:00-12:10
1 stop22h 10m
£368
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Mon 12/1
08:55-21:05
1 stop20h 10m
Ontario
Mon 26/1
12:41-11:40
1 stop14h 59m
£380
LondonOntario
LHR - ONT
LHRONT
London Heathrow
Thu 22/1
07:30-21:58
2 stops22h 28m
Ontario
Mon 26/1
13:53-07:25
1 stop33h 32m
£380
LondonOntario
LCY - ONT
LCYONT
London City
Thu 5/2
07:50-22:48
2 stops22h 58m
Ontario
Thu 12/2
07:10-08:50
2 stops17h 40m
£542
LondonOntario
LGW - ONT
LGWONT
London Gatwick
Mon 19/1
19:40-10:08
2 stops22h 28m
Ontario
Mon 9/2
10:58-19:00
2 stops24h 02m
£559
LondonOntario
LGW - ONT
LGWONT
London Gatwick
Mon 19/1
11:55-23:56
2 stops20h 01m
Ontario
Mon 26/1
06:30-10:55
2 stops20h 25m
£832
Flights are sorted by cheapest return flights first.
Deals found on 21/12
Showing 1-10 of 47 results
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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.
Estimated return 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 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 19 December 2025.
To ensure you get the cheapest price possible for a flight from London to Ontario, you should look to book at least 81 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, September is the cheapest month in which you can book a flight from London to Ontario (average of £238). Flying from London to Ontario in July is currently the most expensive (average of £401). 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 23 December 2025.
It’s optimal to fly from London to Ontario in the evening. By choosing this option you can save up to 24% 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?
What’s the top stopover airport for flights from London to Ontario?
Share of one-stop return flights from London to Ontario chosen by Cheapflights users in the past 12 months, using the same stopover each way.
Dallas (DFW) – chosen by Cheapflights users on 29% of one-stop itineraries from London to Ontario on Cheapflights.
What’s the cheapest stopover airport for flights from London to Ontario?
Average return fare for one-stop flights from London to Ontario, chosen by Cheapflights users in the past 12 months, with the same stopover each way.
Lisbon (LIS) is the most affordable one-stop option, with an average return flight price of £392.
What’s the fastest stopover option from London to Ontario?
Shortest average travel time for one-stop one-way flights from London to Ontario, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.
Flights via Denver (DEN) have the shortest average one-way travel time for one-stop routes: 13h 47m.
Which airport typically offers the quickest stopover for flights from London to Ontario?
Average stopover duration for one-stop one-way flights from London to Ontario, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Denver (DEN) offer the fastest connection on this route, with an average stopover time of 1h 17m.
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 23 December 2025.
Read through reviews of airlines operating flights from London to Ontario, such as Finnair, Virgin Atlantic, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
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.
What airport do you fly into for flights to Ontario from London?
Most people fly into Ontario (ONT) if they book a flight to Ontario from London. On average, Ontario has 0 inbound flights from London per day from 6 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.
How long is the flight from London to Ontario?
Airlines like American Airlines, Virgin Atlantic, and Iberia fly from London to Ontario in about 17h 15m. The time it takes to get you to your destination can typically vary by up to 10h 32m. The distance from London to Ontario is about 5407 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from London to Ontario round-trip?
According to our current data, Finnair (£279), Virgin Atlantic (£375), and British Airways (£386) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 47% less than the average price by searching for these airlines.
Can I find deals for business class flights from London to Ontario?
Yes. Cheapflights offers flight deals from London to Ontario 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 London to Ontario?
Currently, September is the cheapest month in which you can book a flight from London to Ontario (average of £238). Flying from London to Ontario in July is currently the most expensive (average of £401). 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.
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 23 December 2025.
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 23 December 2025.
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.
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