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$486+ Cheap flights from London (LON) to Ontario (ONT)

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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ONT
May 23 — May 301
Sat 5/23
Sat 5/30
1 adult, Economy
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Cheap flight deals from London to Ontario

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 April 23, 2026.

This TravelUp deal was found by Cheapflights users on 4/21. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/174:30 pm
LHR
-
ONT
1 stop15h 27m
British Airways
Tue 12/14:47 pm
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 4/21$619
This TravelUp deal was found by Cheapflights users on 4/22. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/610:05 am
LHR
-
ONT
1 stop14h 17m
British Airways
Mon 5/1110:59 am
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 4/22$621
This TravelUp deal was found by Cheapflights users on 4/21. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2710:05 am
LHR
-
ONT
1 stop14h 17m
British Airways
Mon 5/410:59 am
ONT
-
LHR
1 stop13h 06m
British Airways
Deal found 4/21$627
This American Airlines deal was found by Cheapflights users on 4/21. 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.
Mon 5/254:10 pm
LHR
-
ONT
2 stops35h 46m
American Airlines
Mon 6/110:00 pm
ONT
-
LHR
2 stops24h 50m
American Airlines
Deal found 4/21$634
This TravelUp deal was found by Cheapflights users on 4/22. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/92:25 pm
LHR
-
ONT
1 stop14h 43m
British Airways
Wed 11/184:47 pm
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 4/22$638
This TravelUp deal was found by Cheapflights users on 4/23. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/23:00 pm
LHR
-
ONT
1 stop15h 23m
British Airways
Mon 11/94:47 pm
ONT
-
LHR
1 stop12h 28m
British Airways
Deal found 4/23$639
This TravelUp deal was found by Cheapflights users on 4/22. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2010:55 am
LHR
-
ONT
1 stop13h 22m
KLM
Tue 5/261:29 pm
ONT
-
LHR
1 stop13h 31m
KLM
Deal found 4/22$642
This TravelUp deal was found by Cheapflights users on 4/20. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/412:55 pm
LHR
-
ONT
2 stops18h 53m
Virgin Atlantic
Wed 11/187:00 am
ONT
-
LHR
1 stop16h 35m
Virgin Atlantic
Deal found 4/20$643
This TravelUp deal was found by Cheapflights users on 4/19. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2210:55 am
LHR
-
ONT
1 stop13h 40m
Virgin Atlantic
Wed 7/2911:48 am
ONT
-
LHR
1 stop17h 27m
Virgin Atlantic
Deal found 4/19$644
This TravelUp deal was found by Cheapflights users on 4/19. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:15 am
LHR
-
ONT
2 stops18h 42m
Multiple Airlines
Thu 8/277:20 am
ONT
-
LHR
1 stop20h 50m
Multiple Airlines
Deal found 4/19$645
This TravelUp deal was found by Cheapflights users on 4/19. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1710:05 am
LHR
-
ONT
1 stop16h 42m
British Airways
Thu 8/2710:29 am
ONT
-
LHR
1 stop14h 31m
British Airways
Deal found 4/19$646
This Iberia deal was found by Cheapflights users on 4/22. 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.
Tue 9/811:30 am
LGW
-
ONT
2 stops39h 27m
Iberia
Mon 9/212:22 pm
ONT
-
LGW
2 stops45h 38m
Iberia
Deal found 4/22$704

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 April 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$621
(TravelUp)

One-way from

$486
(Kiwi.com)

Popular in

May

Cheapest in

September

Average price

$706
Provider with most accurate pricing for London (LON)-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Ontario flights.
Search Deals
From London (LON) to Ontario
Search Deals
One-way flight from London (LON) to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($68 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated April 23, 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 round-trip
Quickest round-trip

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 9/7

2:25 pm-9:12 pm

1 stop14h 47m

Ontario

Tue 12/8

4:47 pm-1:15 pm

1 stop12h 28m

$674

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 9/8

2:25 pm-9:12 pm

1 stop14h 47m

Ontario

Mon 12/7

4:47 pm-1:15 pm

1 stop12h 28m

$674

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 6/23

6:15 am-4:42 pm

2 stops18h 27m

Ontario

Sat 7/4

1:00 pm-3:35 pm

2 stops18h 35m

$681

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 7/3

4:20 pm-6:25 pm

2 stops34h 05m

Ontario

Mon 7/13

10:00 pm-6:20 am

2 stops24h 20m

$681

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/19

2:25 pm-10:58 pm

1 stop16h 33m

Ontario

Tue 9/1

7:06 am-6:20 am

1 stop15h 14m

$685

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 9/14

9:20 am-6:01 pm

1 stop16h 41m

Ontario

Tue 9/22

5:55 pm-3:35 pm

1 stop13h 40m

$687

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Tue 9/8

11:30 am-9:08 pm

2 stops41h 38m

Ontario

Tue 9/15

10:25 am-8:00 pm

2 stops25h 35m

$704

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Wed 9/9

11:30 am-11:06 pm

2 stops19h 36m

Ontario

Thu 9/17

2:22 pm-8:00 pm

2 stops21h 38m

$704

LondonOntario

LCY - ONT

LCYONT

London City

Sun 9/6

7:00 pm-6:47 pm

2 stops31h 47m

Ontario

Sun 9/13

11:59 pm-1:40 pm

2 stops29h 41m

$715

LondonOntario

LCY - ONT

LCYONT

London City

Sun 9/6

7:00 pm-6:47 pm

2 stops31h 47m

Ontario

Mon 9/14

7:20 am-11:30 am

2 stops20h 10m

$715

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/20

Showing 1-10 of 60 resultsSorted by cheapest first
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6
  • Most accurate provider: When it comes to deals on London-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London-Ontario 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 London-Ontario 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 London to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from London 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 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 round-trip flight from London to Ontario. Price data was last updated on April 17, 2026.

Booking 76 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from London to Ontario?

Currently, December is the cheapest month in which you can book a flight from London to Ontario (average of $375). Flying from London to Ontario in May is currently the most expensive (average of $560). 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 to fly round-trip from London to Ontario?

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?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly into when you book flights from London to Ontario. 1 airline have flights to Ontario from London on a regular basis. Booking flights from London to Ontario should not be difficult; the airport handles an average of 0 inbound flights from London per day.

  • How long is the flight from London to Ontario?

    Airlines like British Airways, Virgin Atlantic, and Delta fly from London to Ontario in about 14h 47m. The time it takes to get you to your destination can typically vary by up to 19h 18m. London and Ontario are separated by a distance of 5407 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from London to Ontario round-trip?

    Cheapflights users have booked flights from London to Ontario round-trip from $567. This flight start at 14% lower than the current average price 3 months from now.

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

    Most travelers choose London Heathrow - Ontario, London Gatwick - Ontario or London City - Ontario when deciding on the best route from London to 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 vacation 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, December is the cheapest month in which you can book a flight from London to Ontario (average of $375). Flying from London to Ontario in May is currently the most expensive (average of $560). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from London to Ontario

Discover the top airline 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 2,558,603 searches. Data last updated April 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$567Average$588FlexibilityNo cancel feeOn-time70%

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