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Cheap flights from London to Ontario from £290

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 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ONT
24 Apr — 1 May1
1 adult
1 adult, Economy, 0 bags

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 25 March 2026.

Sun 19/409:00
LHR
-
ONT
2 stops21h 45m
United Airlines
Sun 26/406:00
ONT
-
LHR
2 stops19h 40m
United Airlines
Deal found 22/3£452
Fri 17/407:25
LHR
-
ONT
2 stops18h 22m
United Airlines
Fri 24/405:10
ONT
-
LHR
2 stops20h 10m
United Airlines
Deal found 24/3£453
Sat 18/410:50
LHR
-
ONT
2 stops19h 55m
United Airlines
Sat 25/406:00
ONT
-
LHR
2 stops18h 20m
United Airlines
Deal found 21/3£454
Tue 22/914:25
LHR
-
ONT
1 stop14h 43m
British Airways
Tue 29/913:31
ONT
-
LHR
1 stop12h 59m
British Airways
Deal found 23/3£455
Wed 22/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Wed 29/410:59
ONT
-
LHR
1 stop12h 56m
British Airways
Deal found 23/3£456
Tue 11/814:25
LHR
-
ONT
1 stop14h 43m
Iberia
Wed 19/814:22
ONT
-
LHR
1 stop13h 48m
Iberia
Deal found 24/3£458
Wed 2/1215:00
LHR
-
ONT
1 stop15h 19m
British Airways
Tue 8/1216:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 25/3£461
Thu 10/914:25
LHR
-
ONT
1 stop14h 43m
British Airways
Tue 29/913:31
ONT
-
LHR
1 stop12h 59m
British Airways
Deal found 23/3£462
Fri 17/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Tue 21/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 23/3£463
Sun 19/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Wed 29/410:59
ONT
-
LHR
1 stop12h 56m
British Airways
Deal found 20/3£463
Fri 24/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Thu 30/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 24/3£464
Sat 7/1115:00
LHR
-
ONT
1 stop15h 23m
British Airways
Mon 16/1116:47
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 21/3£465

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 25 March 2026.

Round-trip from

£452

One-way from

£290

Popular in

July

Cheapest in

September

Average price

£420
United Airlines
  • United Airlines
  • 19/4-26/4
  • 3 total stops
  • 37h 30m total
  • London to Ontario
Search Deals
6/5
  • 6/5
  • 3 total stops
  • 46h 35m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£31 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 25 March 2026.
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

Cheapest return flight

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 21/4

10:35-18:02

1 stop15h 27m

Ontario

Tue 12/5

13:30-11:10

1 stop13h 40m

£477

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 22/4

10:35-17:47

1 stop15h 12m

Ontario

Fri 1/5

13:40-12:25

1 stop14h 45m

£478
Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 26/4

14:50-20:36

1 stop13h 46m

Ontario

Thu 23/7

13:18-09:40

1 stop12h 22m

£487

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 7/5

14:50-20:36

1 stop13h 46m

Ontario

Sun 24/5

13:50-11:10

1 stop13h 20m

£487

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 10/5

13:40-21:58

1 stop16h 18m

Ontario

Thu 4/6

18:30-09:40

1 stop31h 10m

£489

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 13/5

10:05-16:22

1 stop14h 17m

Ontario

Thu 15/10

13:31-10:30

1 stop12h 59m

£498

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 13/5

10:05-16:22

1 stop14h 17m

Ontario

Wed 14/10

13:31-10:30

1 stop12h 59m

£498

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 13/5

14:25-22:40

1 stop16h 15m

Ontario

Mon 12/10

13:31-10:30

1 stop12h 59m

£498

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 22/6

13:40-21:55

1 stop16h 15m

Ontario

Mon 13/7

13:50-11:10

1 stop13h 20m

£500

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 7/4

10:35-18:02

1 stop15h 27m

Ontario

Tue 14/4

13:27-11:10

1 stop13h 43m

£500

Flights are sorted by cheapest return flights first.

Deals found on 21/3

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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 13 March 2026.

To ensure you get the cheapest price possible for a flight from London to Ontario, you should look to book at least 76 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 £239). Flying from London to Ontario in July is currently the most expensive (average of £387). 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.

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 31% 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 £393.

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 51m.

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 Dallas (DFW) offer the fastest connection on this route, with an average stopover time of 1h 33m.

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 25 March 2026.
Read through reviews of airlines operating flights from London to Ontario, such as Virgin Atlantic,United Airlines, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
685 reviews
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
United Airlines
7.4
Good
9,483 reviews
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
7,820 reviews
Virgin Atlantic
7.5
Good
685 reviews
Check prices

Food

6.9

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.5

Entertainment

7.5

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

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 3 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 United Airlines, British Airways, and Delta fly from London to Ontario in about 15h 27m. The time it takes to get you to your destination can typically vary by up to 31h 27m. 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, United Airlines (£370), Virgin Atlantic (£375), and British Airways (£380) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 24% less than the average price by searching for these airlines.

  • What are the most popular routes from London to Ontario?

    The most popular route from London to Ontario is London Heathrow - Ontario. You may also consider London Gatwick - Ontario or London City - Ontario.

  • Can I find deals for flights from London to Ontario that include hotel bookings?

    Yes. In addition to deals on London to Ontario flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Ontario.

  • 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 £239). Flying from London to Ontario in July is currently the most expensive (average of £387). 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

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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.
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Top 3 airlines flying from London to Ontario

Discover the top 3 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 25 March 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£370Average£465FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£375Average£502FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£380Average£466FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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.

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