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Cheap flights from Ontario to London from £200

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 31/3. 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
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.
KLM Logo
06:00 - 10:30
ONT
-
LHR
21h 30m
1 stop
KLM Logo
06:30 - 17:13
LHR
-
ONT
17h 43m
2 stops
£460KLM
Tue, 10 Mar - Tue, 17 Mar
Iberia Logo
14:08 - 14:25
ONT
-
LHR
16h 17m
1 stop
Iberia Logo
11:30 - 23:46
LHR
-
ONT
20h 16m
2 stops
£472Iberia
Wed, 22 Apr - Wed, 29 Apr
Delta Logo
11:53 - 15:35
ONT
-
LHR
19h 42m
1 stop
Delta Logo
06:30 - 17:15
LHR
-
ONT
18h 45m
2 stops
£475Delta
Wed, 15 Apr - Tue, 5 May
Delta Logo
11:53 - 12:10
ONT
-
LHR
16h 17m
1 stop
Delta Logo
09:55 - 22:37
LHR
-
ONT
20h 42m
2 stops
£476Delta
Wed, 15 Apr - Tue, 5 May
Delta Logo
13:29 - 13:05
ONT
-
LHR
15h 36m
2 stops
Delta Logo
06:30 - 17:15
LHR
-
ONT
18h 45m
2 stops
£478Delta
Wed, 15 Apr - Tue, 5 May
Delta Logo
13:29 - 13:05
ONT
-
LHR
15h 36m
2 stops
Delta Logo
06:30 - 17:15
LHR
-
ONT
18h 45m
2 stops
£479Delta
Wed, 15 Apr - Tue, 5 May
United Airlines Logo
13:40 - 12:00
ONT
-
LHR
15h 20m
1 stop
United Airlines Logo
10:05 - 17:41
LHR
-
ONT
14h 36m
1 stop
£485United Airlines
Wed, 11 Mar - Wed, 18 Mar
United Airlines Logo
13:40 - 12:00
ONT
-
LHR
15h 20m
1 stop
United Airlines Logo
10:05 - 17:41
LHR
-
ONT
14h 36m
1 stop
£486United Airlines
Wed, 18 Mar - Mon, 23 Mar
Multiple Airlines Logo
06:14 - 10:55
ONT
-
LGW
20h 41m
2 stops
Multiple Airlines Logo
11:55 - 23:52
LGW
-
ONT
18h 57m
2 stops
£670Multiple Airlines
Wed, 4 Mar - Wed, 11 Mar
Multiple Airlines Logo
07:00 - 10:55
ONT
-
LGW
20h 55m
2 stops
Multiple Airlines Logo
11:55 - 22:44
LGW
-
ONT
17h 49m
2 stops
£688Multiple Airlines
Tue, 10 Mar - Tue, 17 Mar

United Airlines flights from Ontario to London

Our best United Airlines deals on Ontario to London flight tickets
United Airlines
10 Mar
ONT13:40Ontario
15h 20m
1 stop
LHR12:00London Heathrow
15 Mar
LHR10:05London Heathrow
14h 36m
1 stop
ONT17:41Ontario
£485
United Airlines
18 Mar
ONT13:40Ontario
15h 20m
1 stop
LHR12:00London Heathrow
23 Mar
LHR10:05London Heathrow
14h 36m
1 stop
ONT17:41Ontario
£486
United Airlines
22 Apr
ONT05:10Ontario
17h 35m
2 stops
LHR06:45London Heathrow
29 Apr
LHR09:30London Heathrow
20h 20m
2 stops
ONT21:50Ontario
£487

KLM flights from Ontario to London

Our best KLM deals on Ontario to London flight tickets
KLM
10 Mar
ONT06:00Ontario
21h 30m
1 stop
LHR10:30London Heathrow
17 Mar
LHR06:30London Heathrow
17h 43m
2 stops
ONT17:13Ontario
£460
KLM
10 Mar
ONT12:57Ontario
15h 43m
1 stop
LHR11:40London Heathrow
17 Mar
LHR14:30London Heathrow
33h 43m
1 stop
ONT17:13Ontario
£480
KLM
4 Mar
ONT07:30Ontario
19h 00m
1 stop
LHR10:30London Heathrow
11 Mar
LHR06:30London Heathrow
21h 30m
2 stops
ONT21:00Ontario
£486

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 13 February 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

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/3

06:00-10:30

1 stop21h 30m

London Heathrow

Tue 17/3

06:30-17:13

2 stops17h 43m

£460

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 22/4

14:08-14:25

1 stop16h 17m

London Heathrow

Wed 29/4

11:30-23:46

2 stops20h 16m

£472

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 15/4

11:53-15:35

1 stop19h 42m

London Heathrow

Tue 5/5

06:30-17:15

2 stops18h 45m

£475

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 15/4

11:53-12:10

1 stop16h 17m

London Heathrow

Tue 5/5

09:55-22:37

2 stops20h 42m

£476

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 15/4

13:29-13:05

2 stops15h 36m

London Heathrow

Tue 5/5

06:30-17:15

2 stops18h 45m

£478

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 15/4

13:29-13:05

2 stops15h 36m

London Heathrow

Tue 5/5

06:30-17:15

2 stops18h 45m

£479

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 11/3

13:40-12:00

1 stop15h 20m

London Heathrow

Wed 18/3

10:05-17:41

1 stop14h 36m

£485

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 18/3

13:40-12:00

1 stop15h 20m

London Heathrow

Mon 23/3

10:05-17:41

1 stop14h 36m

£486

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 4/3

06:14-10:55

2 stops20h 41m

London Gatwick

Wed 11/3

11:55-23:52

2 stops18h 57m

£670

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 10/3

07:00-10:55

2 stops20h 55m

London Gatwick

Tue 17/3

11:55-22:44

2 stops17h 49m

£688

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in February. Flight prices, which tend to average around £480, are often lower during this time because this is during the off-season. The month of March is another great option to travel to London, with average flight prices from Ontario averaging around £501.

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 £491. 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 £583.

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

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £500. Flights at midday are often more expensive, with an average ticket price of £630.

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

13h 01m

Direct flights

None
The fastest flight from Ontario to London takes 13h 01m
There are no direct flights from Ontario to London. There are no popular flight routes from Ontario to London.
Search flight deals

  • How far is Ontario to London by plane?

    Ontario and London are 5417.5 mi apart from one another. Typically, this will take 13h 01m 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
Milton Keynes
Luton
Gatwick
Slough
Maidstone
Southend-on-Sea
Canterbury
Ipswich
Ilford
Guildford
Chelmsford
Hayes
Wembley
Dover
Folkestone
Colchester
Bedford
Worthing
Ramsgate

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