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Ontario

$506+ 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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ONT
Jun 9 — Jun 161
Tue 6/9
Tue 6/16
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 May 10, 2026.

This TravelUp deal was found by Cheapflights users on 5/10. 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 11/43:00 pm
LHR
-
ONT
1 stop15h 23m
British Airways
Thu 1/283:09 pm
ONT
-
LHR
1 stop12h 51m
British Airways
Deal found 5/10$635
This TravelUp deal was found by Cheapflights users on 5/7. 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.
Thu 11/510:45 am
LHR
-
ONT
1 stop13h 27m
Virgin Atlantic
Sat 11/141:00 pm
ONT
-
LHR
1 stop13h 00m
Virgin Atlantic
Deal found 5/7$639
This TravelUp deal was found by Cheapflights users on 5/7. 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.
Sat 10/310:55 am
LHR
-
ONT
1 stop20h 49m
Virgin Atlantic
Fri 10/167:00 am
ONT
-
LHR
1 stop22h 15m
Virgin Atlantic
Deal found 5/7$641
This TravelUp deal was found by Cheapflights users on 5/7. 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 6/910:55 am
LHR
-
ONT
1 stop13h 46m
Virgin Atlantic
Thu 7/237:05 am
ONT
-
LHR
1 stop15h 20m
Virgin Atlantic
Deal found 5/7$643
This TravelUp deal was found by Cheapflights users on 5/10. 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 6/111:40 am
LHR
-
ONT
1 stop18h 52m
Virgin Atlantic
Mon 6/87:05 am
ONT
-
LHR
1 stop15h 20m
Virgin Atlantic
Deal found 5/10$647
This United Airlines deal was found by Cheapflights users on 5/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/57:30 am
LHR
-
ONT
2 stops20h 46m
United Airlines
Thu 10/155:00 am
ONT
-
LHR
2 stops18h 15m
United Airlines
Deal found 5/6$659
This oojo deal was found by Cheapflights users on 5/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/268:40 am
LHR
-
ONT
2 stops22h 54m
Virgin Atlantic
Tue 6/25:50 pm
ONT
-
LHR
1 stop13h 45m
Virgin Atlantic
Deal found 5/9$663
This TravelUp deal was found by Cheapflights users on 5/8. 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 6/1010:55 am
LHR
-
ONT
1 stop20h 54m
Virgin Atlantic
Tue 6/301:00 pm
ONT
-
LHR
1 stop14h 00m
Virgin Atlantic
Deal found 5/8$665
This Delta deal was found by Cheapflights users on 5/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:30 am
LHR
-
ONT
2 stops18h 38m
Delta
Mon 6/810:00 pm
ONT
-
LHR
1 stop24h 25m
Delta
Deal found 5/9$668
This Delta deal was found by Cheapflights users on 5/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/109:20 am
LCY
-
ONT
2 stops21h 21m
Delta
Tue 6/301:00 pm
ONT
-
LCY
2 stops19h 40m
Delta
Deal found 5/8$786
This Delta deal was found by Cheapflights users on 5/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/59:20 am
LCY
-
ONT
2 stops22h 14m
Delta
Mon 6/81:00 pm
ONT
-
LCY
2 stops19h 40m
Delta
Deal found 5/8$808
This Iberia deal was found by Cheapflights users on 5/6. 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.
Wed 11/47:50 am
LCY
-
ONT
2 stops24h 07m
Iberia
Wed 11/2510:47 am
ONT
-
LCY
2 stops19h 18m
Iberia
Deal found 5/6$831

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 May 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$635
(TravelUp)

One-way from

$506
(TravelUp)

Popular in

May

Cheapest in

September

Average price

$888
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 ($66 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 May 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 May 10, 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

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 8/17

11:00 am-6:15 pm

1 stop15h 15m

Ontario

Thu 9/10

1:31 pm-10:30 am

1 stop12h 59m

$673

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/5

11:45 am-11:34 pm

2 stops19h 49m

Ontario

Thu 8/13

11:56 am-1:15 pm

1 stop17h 19m

$674
Quickest round-trip

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/9

2:25 pm-9:08 pm

1 stop14h 43m

Ontario

Thu 11/5

4:47 pm-1:15 pm

1 stop12h 28m

$686

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/3

10:35 am-6:11 pm

1 stop15h 36m

Ontario

Thu 9/10

1:18 pm-9:40 am

1 stop12h 22m

$693

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 8/21

9:15 am-9:12 pm

2 stops43h 57m

Ontario

Sun 8/23

11:59 pm-6:20 am

1 stop22h 21m

$694

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/18

10:55 am-10:23 pm

1 stop19h 28m

Ontario

Sun 8/16

6:01 pm-3:35 pm

1 stop13h 34m

$783

LondonOntario

LCY - ONT

LCYONT

London City

Wed 6/10

9:20 am-10:41 pm

2 stops21h 21m

Ontario

Tue 6/30

1:00 pm-4:40 pm

2 stops19h 40m

$786

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/27

5:00 pm-11:58 pm

1 stop14h 58m

Ontario

Mon 6/1

8:11 pm-3:05 pm

1 stop34h 54m

$788

LondonOntario

LCY - ONT

LCYONT

London City

Fri 6/5

9:20 am-11:34 pm

2 stops22h 14m

Ontario

Mon 6/8

1:00 pm-4:40 pm

2 stops19h 40m

$808

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/23

9:30 am-9:59 pm

2 stops20h 29m

Ontario

Sun 9/27

1:18 pm-9:40 am

1 stop12h 22m

$823

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/8

Showing 1-10 of 60 resultsSorted by cheapest first
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  • 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?

Booking 55 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 Virgin Atlantic, British Airways, and United Airlines fly from London to Ontario in about 14h 43m. The time it takes to get you to your destination can typically vary by up to 5h 06m. 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 13% 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 May 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$567Average$709FlexibilityNo cancel feeOn-time70%

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