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Cheap flights from Ontario to London from £216

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 3/10. 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

Find the cheapest flights from Ontario to London

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
06:07 - 10:00
ONT
-
LHR
19h 53m
2 stops
Multiple Airlines Logo
14:45 - 13:16
LHR
-
ONT
29h 31m
1 stop
£597Multiple Airlines
Mon, 19 Oct - Thu, 29 Oct
Multiple Airlines Logo
05:00 - 11:50
ONT
-
LHR
23h 50m
2 stops
Multiple Airlines Logo
14:45 - 11:18
LHR
-
ONT
28h 33m
1 stop
£599Multiple Airlines
Wed, 28 Oct - Tue, 10 Nov
Multiple Airlines Logo
13:52 - 13:20
ONT
-
LHR
15h 28m
2 stops
Multiple Airlines Logo
14:45 - 23:45
LHR
-
ONT
16h 00m
1 stop
£600Multiple Airlines
Tue, 20 Oct - Sun, 25 Oct
Alaska Airlines Logo
14:13 - 15:05
ONT
-
LHR
16h 52m
1 stop
Alaska Airlines Logo
14:45 - 18:00
LHR
-
ONT
34h 15m
1 stop
£606Alaska Airlines
Tue, 20 Oct - Tue, 27 Oct
Alaska Airlines Logo
19:10 - 12:20
ONT
-
LHR
33h 10m
1 stop
Alaska Airlines Logo
14:45 - 22:54
LHR
-
ONT
16h 09m
1 stop
£609Alaska Airlines
Sun, 1 Nov - Wed, 11 Nov
Delta Logo
13:17 - 15:45
ONT
-
LGW
19h 28m
2 stops
Delta Logo
10:00 - 22:43
LGW
-
ONT
20h 43m
2 stops
£656Delta
Tue, 27 Oct - Wed, 4 Nov
Delta Logo
07:05 - 09:40
ONT
-
LGW
18h 35m
2 stops
Delta Logo
10:35 - 22:43
LGW
-
ONT
20h 08m
2 stops
£685Delta
Mon, 12 Oct - Tue, 20 Oct
American Airlines Logo
07:05 - 08:40
ONT
-
LGW
17h 35m
2 stops
American Airlines Logo
10:30 - 22:59
LGW
-
ONT
20h 29m
2 stops
£700American Airlines
Tue, 1 Sep - Tue, 8 Sep
Iberia Logo
14:15 - 20:00
ONT
-
LGW
21h 45m
2 stops
Iberia Logo
11:30 - 22:59
LGW
-
ONT
19h 29m
2 stops
£795Iberia
Tue, 4 Aug - Fri, 28 Aug
Iberia Logo
10:29 - 13:20
ONT
-
LCY
18h 51m
2 stops
Iberia Logo
09:35 - 22:59
LCY
-
ONT
21h 24m
2 stops
£844Iberia
Mon, 24 Aug - Tue, 8 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
10 Nov
ONT06:00Ontario
17h 50m
2 stops
LHR07:50London Heathrow
16 Nov
LHR17:50London Heathrow
30h 22m
2 stops
ONT16:12Ontario
£649
Virgin Atlantic
5 Aug
ONT18:01Ontario
13h 34m
1 stop
LHR15:35London Heathrow
26 Aug
LHR10:55London Heathrow
13h 29m
1 stop
ONT16:24Ontario
£802

British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets
British Airways
18 Oct
ONT13:05Ontario
13h 25m
1 stop
LHR10:30London Heathrow
25 Oct
LHR13:15London Heathrow
15h 39m
1 stop
ONT21:54Ontario
£612
British Airways
10 Nov
ONT14:22Ontario
13h 38m
1 stop
LHR12:00London Heathrow
29 Nov
LHR13:15London Heathrow
13h 50m
1 stop
ONT19:05Ontario
£619
British Airways
18 Nov
ONT12:42Ontario
13h 18m
1 stop
LHR10:00London Heathrow
23 Nov
LHR13:50London Heathrow
15h 49m
1 stop
ONT21:39Ontario
£620

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 23 July 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

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 19/10

06:07-10:00

2 stops19h 53m

London Heathrow

Thu 29/10

14:45-13:16

1 stop29h 31m

£597

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 28/10

05:00-11:50

2 stops23h 50m

London Heathrow

Tue 10/11

14:45-11:18

1 stop28h 33m

£599
Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 20/10

13:52-13:20

2 stops15h 28m

London Heathrow

Sun 25/10

14:45-23:45

1 stop16h 00m

£600

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 20/10

14:13-15:05

1 stop16h 52m

London Heathrow

Tue 27/10

14:45-18:00

1 stop34h 15m

£606

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 1/11

19:10-12:20

1 stop33h 10m

London Heathrow

Wed 11/11

14:45-22:54

1 stop16h 09m

£609

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 27/10

13:17-15:45

2 stops19h 28m

London Gatwick

Wed 4/11

10:00-22:43

2 stops20h 43m

£656

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 12/10

07:05-09:40

2 stops18h 35m

London Gatwick

Tue 20/10

10:35-22:43

2 stops20h 08m

£685

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 1/9

07:05-08:40

2 stops17h 35m

London Gatwick

Tue 8/9

10:30-22:59

2 stops20h 29m

£700

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 4/8

14:15-20:00

2 stops21h 45m

London Gatwick

Fri 28/8

11:30-22:59

2 stops19h 29m

£795

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Mon 24/8

10:29-13:20

2 stops18h 51m

London City

Tue 8/9

09:35-22:59

2 stops21h 24m

£844

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 March. Flight prices, which tend to average around £496, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Ontario averaging around £505.

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

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £614. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to London for around £712.

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 £574. Flights in the evening are often more expensive, with an average ticket price of £684.

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 18m

Direct flights

None
The fastest flight from Ontario to London takes 12h 18m
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 18m 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
Gatwick
Milton Keynes
Luton
Southend-on-Sea
Slough
Ipswich
Maidstone
Folkestone
Ilford
Hastings
Canterbury
Guildford
Chichester
Hayes
Bedford
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