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Cheap flights from Ontario to London from £217

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
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Find the cheapest flights from Ontario to London

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
06:00 - 12:20
ONT
-
LHR
22h 20m
1 stop
Multiple Airlines Logo
14:45 - 22:23
LHR
-
ONT
15h 38m
1 stop
£613Multiple Airlines
Tue, 3 Nov - Tue, 10 Nov
Multiple Airlines Logo
06:00 - 09:00
ONT
-
LHR
19h 00m
1 stop
Multiple Airlines Logo
11:30 - 23:52
LHR
-
ONT
20h 22m
2 stops
£613Multiple Airlines
Mon, 19 Oct - Wed, 21 Oct
British Airways Logo
13:05 - 10:30
ONT
-
LHR
13h 25m
1 stop
British Airways Logo
16:10 - 21:54
LHR
-
ONT
13h 44m
1 stop
£615British Airways
Tue, 6 Oct - Sun, 11 Oct
British Airways Logo
10:47 - 10:00
ONT
-
LHR
15h 13m
1 stop
British Airways Logo
14:45 - 22:14
LHR
-
ONT
15h 29m
1 stop
£616British Airways
Tue, 8 Dec - Fri, 25 Dec
Delta Logo
12:17 - 16:00
ONT
-
LGW
19h 43m
2 stops
Delta Logo
10:25 - 22:43
LGW
-
ONT
20h 18m
2 stops
£653Delta
Mon, 5 Oct - Fri, 16 Oct
Delta Logo
07:05 - 09:25
ONT
-
LGW
18h 20m
2 stops
Delta Logo
10:00 - 22:01
LGW
-
ONT
19h 01m
2 stops
£654Delta
Sun, 11 Oct - Fri, 30 Oct
KLM Logo
07:05 - 07:15
ONT
-
LCY
16h 10m
2 stops
KLM Logo
07:45 - 18:18
LCY
-
ONT
18h 33m
2 stops
£852KLM
Tue, 3 Nov - Tue, 17 Nov
Iberia Logo
10:25 - 15:15
ONT
-
LCY
20h 50m
2 stops
Iberia Logo
08:10 - 22:40
LCY
-
ONT
22h 30m
2 stops
£891Iberia
Wed, 7 Oct - Tue, 13 Oct
KLM Logo
07:00 - 07:15
ONT
-
LCY
16h 15m
2 stops
KLM Logo
07:45 - 18:18
LCY
-
ONT
18h 33m
2 stops
£1,000KLM
Tue, 1 Dec - Tue, 8 Dec
Iberia Logo
10:29 - 15:15
ONT
-
LCY
20h 46m
2 stops
Iberia Logo
09:35 - 22:59
LCY
-
ONT
21h 24m
2 stops
£1,032Iberia
Tue, 1 Sep - Tue, 8 Sep

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Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets
Delta
1 Dec
ONT06:00Ontario
17h 50m
2 stops
LHR07:50London Heathrow
8 Dec
LHR06:30London Heathrow
18h 47m
2 stops
ONT17:17Ontario
£648
Delta
5 Oct
ONT12:17Ontario
19h 43m
2 stops
LGW16:00London Gatwick
16 Oct
LGW10:25London Gatwick
20h 18m
2 stops
ONT22:43Ontario
£653
Delta
11 Oct
ONT07:05Ontario
18h 20m
2 stops
LGW09:25London Gatwick
30 Oct
LGW10:00London Gatwick
19h 01m
2 stops
ONT22:01Ontario
£654

Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets
Alaska Airlines
11 Oct
ONT11:13Ontario
19h 52m
1 stop
LHR15:05London Heathrow
24 Oct
LHR17:00London Heathrow
14h 45m
1 stop
ONT23:45Ontario
£628
Alaska Airlines
22 Nov
ONT06:00Ontario
22h 20m
1 stop
LHR12:20London Heathrow
27 Nov
LHR14:45London Heathrow
15h 54m
1 stop
ONT22:39Ontario
£643
Alaska Airlines
7 Oct
ONT06:02Ontario
25h 03m
1 stop
LHR15:05London Heathrow
13 Oct
LHR17:00London Heathrow
14h 45m
1 stop
ONT23:45Ontario
£646

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 10 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

Tue 3/11

06:00-12:20

1 stop22h 20m

London Heathrow

Tue 10/11

14:45-22:23

1 stop15h 38m

£613

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 19/10

06:00-09:00

1 stop19h 00m

London Heathrow

Wed 21/10

11:30-23:52

2 stops20h 22m

£613
Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 6/10

13:05-10:30

1 stop13h 25m

London Heathrow

Sun 11/10

16:10-21:54

1 stop13h 44m

£615

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 8/12

10:47-10:00

1 stop15h 13m

London Heathrow

Fri 25/12

14:45-22:14

1 stop15h 29m

£616

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 5/10

12:17-16:00

2 stops19h 43m

London Gatwick

Fri 16/10

10:25-22:43

2 stops20h 18m

£653

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Sun 11/10

07:05-09:25

2 stops18h 20m

London Gatwick

Fri 30/10

10:00-22:01

2 stops19h 01m

£654

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Tue 3/11

07:05-07:15

2 stops16h 10m

London City

Tue 17/11

07:45-18:18

2 stops18h 33m

£852

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Wed 7/10

10:25-15:15

2 stops20h 50m

London City

Tue 13/10

08:10-22:40

2 stops22h 30m

£891

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Tue 1/12

07:00-07:15

2 stops16h 15m

London City

Tue 8/12

07:45-18:18

2 stops18h 33m

£1,000

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Tue 1/9

10:29-15:15

2 stops20h 46m

London City

Tue 8/9

09:35-22:59

2 stops21h 24m

£1,032

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 September. Flight prices, which tend to average around £187, 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 £210.

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 £571. 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 £701.

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 £573. Flights in the evening are often more expensive, with an average ticket price of £665.

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
Gatwick
Milton Keynes
Luton
Southend-on-Sea
Slough
Maidstone
Ipswich
Ilford
Folkestone
Canterbury
Guildford
Hayes
Hastings
Chichester
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