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Cheap flights from Ontario to London from £158

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to London departing on 18/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags
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Find the cheapest flights from Ontario to London

Cheap return flights

Enter your travel dates to find the best prices.
Virgin Atlantic Logo
12:00 - 11:40
ONT
-
LHR
15h 40m
1 stop
Virgin Atlantic Logo
12:20 - 22:43
LHR
-
ONT
18h 23m
1 stop
£325Virgin Atlantic
Thu, 17 Dec - Tue, 22 Dec
Virgin Atlantic Logo
07:00 - 11:40
ONT
-
LHR
20h 40m
1 stop
Virgin Atlantic Logo
11:40 - 23:48
LHR
-
ONT
20h 08m
2 stops
£326Virgin Atlantic
Thu, 17 Dec - Tue, 22 Dec
Virgin Atlantic Logo
11:59 - 12:10
ONT
-
LHR
16h 11m
1 stop
Virgin Atlantic Logo
09:40 - 23:48
LHR
-
ONT
22h 08m
2 stops
£603Virgin Atlantic
Fri, 24 Jul - Sun, 2 Aug
Multiple Airlines Logo
06:00 - 08:15
ONT
-
LHR
19h 15m
1 stop
Multiple Airlines Logo
19:40 - 09:57
LHR
-
ONT
22h 17m
2 stops
£619Multiple Airlines
Sun, 25 Oct - Wed, 4 Nov
Multiple Airlines Logo
10:25 - 12:50
ONT
-
LHR
18h 25m
1 stop
Multiple Airlines Logo
11:30 - 23:06
LHR
-
ONT
19h 36m
2 stops
£620Multiple Airlines
Tue, 29 Sep - Tue, 13 Oct
Delta Logo
11:56 - 16:00
ONT
-
LGW
20h 04m
2 stops
Delta Logo
10:25 - 22:45
LGW
-
ONT
20h 20m
2 stops
£718Delta
Wed, 19 Aug - Fri, 28 Aug
Delta Logo
12:00 - 16:00
ONT
-
LGW
20h 00m
2 stops
Delta Logo
10:25 - 22:45
LGW
-
ONT
20h 20m
2 stops
£755Delta
Sat, 8 Aug - Fri, 21 Aug
British Airways Logo
06:00 - 08:35
ONT
-
LGW
18h 35m
2 stops
British Airways Logo
11:30 - 22:59
LGW
-
ONT
19h 29m
2 stops
£783British Airways
Wed, 26 Aug - Sat, 5 Sep
Iberia Logo
10:25 - 13:20
ONT
-
LCY
18h 55m
2 stops
Iberia Logo
09:35 - 23:06
LCY
-
ONT
21h 31m
2 stops
£811Iberia
Mon, 5 Oct - Tue, 13 Oct
Iberia Logo
10:29 - 15:15
ONT
-
LCY
20h 46m
2 stops
Iberia Logo
09:50 - 22:59
LCY
-
ONT
21h 09m
2 stops
£886Iberia
Thu, 20 Aug - Thu, 3 Sep

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Virgin Atlantic flights from Ontario to London

Our best Virgin Atlantic deals on Ontario to London flight tickets
Virgin Atlantic
24 Jul
ONT11:59Ontario
16h 11m
1 stop
LHR12:10London Heathrow
2 Aug
LHR09:40London Heathrow
22h 08m
2 stops
ONT23:48Ontario
£603
Virgin Atlantic
24 Jul
ONT11:59Ontario
16h 11m
1 stop
LHR12:10London Heathrow
2 Aug
LHR11:40London Heathrow
19h 12m
1 stop
ONT22:52Ontario
£642

Air Canada flights from Ontario to London

Our best Air Canada deals on Ontario to London flight tickets
Air Canada
3 Nov
ONT09:00Ontario
18h 50m
2 stops
LHR11:50London Heathrow
11 Nov
LHR14:30London Heathrow
29h 31m
2 stops
ONT12:01Ontario
£657
Air Canada
17 Nov
ONT05:00Ontario
18h 10m
2 stops
LHR07:10London Heathrow
27 Nov
LHR14:30London Heathrow
38h 26m
2 stops
ONT20:56Ontario
£660
Air Canada
2 Nov
ONT06:00Ontario
18h 30m
2 stops
LHR08:30London Heathrow
11 Nov
LHR14:30London Heathrow
29h 31m
2 stops
ONT12:01Ontario
£663

momondo Fare Finder

 
Customise your flight search to find flights from Ontario to London 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, momondo users made 279,928 searches. Data last updated 28 June 2026.
Use the filters below to find and compare flights from Ontario to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 17/12

12:00-11:40

1 stop15h 40m

London Heathrow

Tue 22/12

12:20-22:43

1 stop18h 23m

£325

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 17/12

07:00-11:40

1 stop20h 40m

London Heathrow

Tue 22/12

11:40-23:48

2 stops20h 08m

£326

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 24/7

11:59-12:10

1 stop16h 11m

London Heathrow

Sun 2/8

09:40-23:48

2 stops22h 08m

£603

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 25/10

06:00-08:15

1 stop19h 15m

London Heathrow

Wed 4/11

19:40-09:57

2 stops22h 17m

£619

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 29/9

10:25-12:50

1 stop18h 25m

London Heathrow

Tue 13/10

11:30-23:06

2 stops19h 36m

£620

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 19/8

11:56-16:00

2 stops20h 04m

London Gatwick

Fri 28/8

10:25-22:45

2 stops20h 20m

£718

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Sat 8/8

12:00-16:00

2 stops20h 00m

London Gatwick

Fri 21/8

10:25-22:45

2 stops20h 20m

£755

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 26/8

06:00-08:35

2 stops18h 35m

London Gatwick

Sat 5/9

11:30-22:59

2 stops19h 29m

£783

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Mon 5/10

10:25-13:20

2 stops18h 55m

London City

Tue 13/10

09:35-23:06

2 stops21h 31m

£811

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Thu 20/8

10:29-15:15

2 stops20h 46m

London City

Thu 3/9

09:50-22:59

2 stops21h 09m

£886

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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See travel insights to London from

How to get the cheapest flight ticket from Ontario to London

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Ontario and London?

What is the cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in September. Flight prices, which tend to average around £190, are often lower during this time because this is during the off-season. The month of December is another great option to travel to London, with average flight prices from Ontario averaging around £214.

What is the cheapest day to depart on your flight to London?

Our data shows that Wednesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £574. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to London for around £707.

What is the cheapest time of day to depart on your flight to London?

The cheapest time of day to fly to London is at midday when flights can be purchased for as low as £582. Flights in the evening are often more expensive, with an average ticket price of £667.

When to book flights from Ontario to London

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to London according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Ontario to London (ONT to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to London

Fastest flight time

12h 22m

Direct flights

None
The fastest flight from Ontario to London takes 12h 22m
There are no direct flights from Ontario to London. There are no popular flight routes from Ontario to London.
Search flight deals

Frequently asked questions about flying from Ontario to London

  • How far is Ontario to London by plane?

    Ontario and London are 5417.5 mi apart from one another. Typically, this will take 12h 22m by plane in normal conditions.

  • When did momondo last update prices for flights from Ontario Airport to London?

    Prices for flights from Ontario Airport to London refresh daily.

  • How old do you have to be to fly from Ontario Airport to London?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to London.

  • What documentation or ID do you need to fly to London?

    The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Wembley
Milton Keynes
Gatwick
Luton
Slough
Southend-on-Sea
Maidstone
Ipswich
Ilford
Canterbury
Folkestone
Guildford
Hayes
Chichester
Bedford
Hastings
Colchester
Harlow
Chelmsford

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to London?

Finding the right flight to London from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

Can I find flights from Ontario to London with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to London?

Once you have performed a search for Ontario to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to London right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport