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Ontario

$459+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
LON — ONT
Aug 2 — Aug 91
Sun 8/2
Sun 8/9
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 July 3, 2026.

This TravelUp deal was found by Cheapflights users on 6/29. 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.
Fri 10/235:10 pm
LHR
-
ONT
2 stops36h 52m
Virgin Atlantic
Sat 10/316:20 am
ONT
-
LHR
1 stop21h 10m
Virgin Atlantic
Deal found 6/29$614
This Flightcatchers deal was found by Cheapflights users on 6/28. 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 Flightcatchers is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:30 pm
LHR
-
ONT
2 stops36h 15m
Virgin Atlantic
Wed 9/166:00 pm
ONT
-
LHR
2 stops18h 10m
Virgin Atlantic
Deal found 6/28$626
This TravelUp deal was found by Cheapflights users on 7/1. 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 12/2410:45 am
LHR
-
ONT
1 stop13h 28m
Virgin Atlantic
Sat 1/91:00 pm
ONT
-
LHR
1 stop13h 00m
Virgin Atlantic
Deal found 7/1$629
This TravelUp deal was found by Cheapflights users on 6/29. 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 9/110:55 am
LHR
-
ONT
1 stop13h 29m
Virgin Atlantic
Tue 9/156:00 pm
ONT
-
LHR
1 stop13h 35m
Virgin Atlantic
Deal found 6/29$630
This TravelUp deal was found by Cheapflights users on 6/29. 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 9/1011:40 am
LHR
-
ONT
1 stop19h 00m
Virgin Atlantic
Wed 9/2311:54 am
ONT
-
LHR
1 stop16h 16m
Virgin Atlantic
Deal found 6/29$640
This TravelUp deal was found by Cheapflights users on 6/30. 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 9/1710:55 am
LHR
-
ONT
1 stop13h 40m
Multiple Airlines
Sat 9/261:04 pm
ONT
-
LHR
1 stop12h 56m
Multiple Airlines
Deal found 6/30$652
This TravelUp deal was found by Cheapflights users on 7/2. 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 8/65:45 pm
LHR
-
ONT
2 stops60h 38m
Virgin Atlantic
Thu 8/1311:56 am
ONT
-
LHR
1 stop19h 39m
Virgin Atlantic
Deal found 7/2$656
This Delta deal was found by Cheapflights users on 6/28. 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.
Tue 9/19:20 am
LCY
-
ONT
2 stops21h 25m
Delta
Wed 9/161:04 pm
ONT
-
LCY
2 stops19h 36m
Delta
Deal found 6/28$689
This Delta deal was found by Cheapflights users on 6/29. 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 10/2310:25 am
LGW
-
ONT
2 stops20h 18m
Delta
Sat 10/311:17 pm
ONT
-
LGW
2 stops19h 28m
Delta
Deal found 6/29$707
This oojo deal was found by Cheapflights users on 6/29. 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.
Mon 9/218:15 pm
LCY
-
ONT
2 stops35h 32m
Virgin Atlantic
Tue 9/291:04 pm
ONT
-
LCY
2 stops20h 16m
Virgin Atlantic
Deal found 6/29$709
This Delta deal was found by Cheapflights users on 7/2. 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.
Sat 7/1110:25 am
LGW
-
ONT
2 stops20h 27m
Delta
Tue 8/256:20 am
ONT
-
LGW
2 stops19h 05m
Delta
Deal found 7/2$761
This Delta deal was found by Cheapflights users on 7/2. 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.
Sat 7/1110:25 am
LGW
-
ONT
2 stops20h 27m
Delta
Sun 7/1910:00 pm
ONT
-
LGW
2 stops27h 40m
Delta
Deal found 7/2$762

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 July 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$626
(Flightcatchers)

One-way from

$459
(TravelUp)

Popular in

June

Cheapest in

September

Average price

$720
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. 15% potential increase in price ($128 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 3, 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

Fri 9/25

9:20 am-6:09 pm

1 stop16h 49m

Ontario

Thu 10/8

5:52 pm-3:35 pm

1 stop13h 43m

$662

LondonOntario

LCY - ONT

LCYONT

London City

Tue 9/1

9:20 am-10:45 pm

2 stops21h 25m

Ontario

Wed 9/16

1:04 pm-4:40 pm

2 stops19h 36m

$689

LondonOntario

LCY - ONT

LCYONT

London City

Mon 9/21

8:15 pm-11:47 pm

2 stops35h 32m

Ontario

Tue 9/29

1:04 pm-5:20 pm

2 stops20h 16m

$709

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 8/21

2:50 pm-8:53 pm

1 stop14h 03m

Ontario

Sun 9/6

1:18 pm-12:35 pm

1 stop15h 17m

$762

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 9/29

5:00 pm-11:16 am

1 stop26h 16m

Ontario

Tue 10/20

6:02 am-3:05 pm

1 stop25h 03m

$769

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 9/26

5:00 pm-11:16 am

1 stop26h 16m

Ontario

Sun 10/11

11:13 am-3:05 pm

1 stop19h 52m

$772

LondonOntario

LCY - ONT

LCYONT

London City

Sat 8/29

7:45 am-4:24 pm

2 stops16h 39m

Ontario

Mon 8/31

1:06 pm-4:40 pm

2 stops19h 34m

$779

LondonOntario

LCY - ONT

LCYONT

London City

Wed 8/26

10:00 am-10:45 pm

2 stops20h 45m

Ontario

Mon 8/31

1:06 pm-4:40 pm

2 stops19h 34m

$817

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 7/22

1:40 pm-9:55 pm

1 stop16h 15m

Ontario

Tue 8/11

1:56 pm-11:10 am

1 stop13h 14m

$819

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 7/23

1:40 pm-9:55 pm

1 stop16h 15m

Ontario

Thu 7/30

1:18 pm-12:25 pm

1 stop15h 07m

$821

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

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

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 $398). Flying from London to Ontario in May is currently the most expensive (average of $611). 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?

How far ahead should I book a flight from London to Ontario?

Booking 60 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.

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. 0 airlines 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 Delta, Virgin Atlantic, and United Airlines fly from London to Ontario in about 14h 03m. The time it takes to get you to your destination can typically vary by up to 21h 29m. 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 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, March is the cheapest month in which you can book a flight from London to Ontario (average of $398). Flying from London to Ontario in May is currently the most expensive (average of $611). 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.

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