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Cheap flights from Ontario to London from £238

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 16/11. 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.
British Airways Logo
12:46 - 10:00
ONT
-
LHR
13h 14m
1 stop
British Airways Logo
14:45 - 22:19
LHR
-
ONT
15h 34m
1 stop
£609British Airways
Sun, 15 Nov - Wed, 16 Dec
British Airways Logo
13:04 - 10:30
ONT
-
LHR
13h 26m
1 stop
British Airways Logo
14:45 - 23:52
LHR
-
ONT
16h 07m
1 stop
£612British Airways
Sun, 4 Oct - Sun, 25 Oct
Multiple Airlines Logo
07:00 - 12:00
ONT
-
LHR
22h 00m
1 stop
Multiple Airlines Logo
19:05 - 09:57
LHR
-
ONT
22h 52m
2 stops
£613Multiple Airlines
Mon, 26 Oct - Fri, 13 Nov
British Airways Logo
06:00 - 09:00
ONT
-
LHR
19h 00m
1 stop
British Airways Logo
16:10 - 21:54
LHR
-
ONT
13h 44m
1 stop
£614British Airways
Wed, 7 Oct - Wed, 14 Oct
Multiple Airlines Logo
10:25 - 09:00
ONT
-
LHR
14h 35m
1 stop
Multiple Airlines Logo
08:20 - 21:11
LHR
-
ONT
19h 51m
1 stop
£614Multiple Airlines
Sun, 18 Oct - Thu, 29 Oct
Delta Logo
12:00 - 15:45
ONT
-
LGW
19h 45m
2 stops
Delta Logo
10:00 - 22:43
LGW
-
ONT
20h 43m
2 stops
£654Delta
Wed, 2 Dec - Wed, 9 Dec
Delta Logo
06:20 - 09:30
ONT
-
LCY
19h 10m
2 stops
Delta Logo
09:20 - 22:43
LCY
-
ONT
21h 23m
2 stops
£704Delta
Thu, 8 Oct - Thu, 15 Oct
Iberia Logo
10:47 - 14:05
ONT
-
LCY
19h 18m
2 stops
Iberia Logo
07:50 - 22:19
LCY
-
ONT
22h 29m
2 stops
£709Iberia
Wed, 2 Dec - Wed, 9 Dec
SWISS Logo
13:56 - 13:45
ONT
-
LCY
39h 49m
2 stops
SWISS Logo
09:15 - 20:01
LCY
-
ONT
18h 46m
2 stops
£871SWISS
Fri, 14 Aug - Fri, 21 Aug
Iberia Logo
10:25 - 15:15
ONT
-
LCY
20h 50m
2 stops
Iberia Logo
08:10 - 22:40
LCY
-
ONT
22h 30m
2 stops
£894Iberia
Wed, 7 Oct - Tue, 13 Oct

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KLM flights from Ontario to London

Our best KLM deals on Ontario to London flight tickets
KLM
6 Oct
ONT12:18Ontario
16h 57m
1 stop
LHR13:15London Heathrow
15 Oct
LHR06:30London Heathrow
18h 47m
2 stops
ONT17:17Ontario
£646
KLM
7 Jul
ONT13:00Ontario
14h 00m
1 stop
LHR11:00London Heathrow
23 Aug
LHR10:55London Heathrow
13h 29m
1 stop
ONT16:24Ontario
£868

Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets
Delta
7 Oct
ONT09:45Ontario
19h 30m
2 stops
LHR13:15London Heathrow
14 Oct
LHR06:30London Heathrow
18h 42m
2 stops
ONT17:12Ontario
£649
Delta
2 Dec
ONT12:00Ontario
19h 45m
2 stops
LGW15:45London Gatwick
9 Dec
LGW10:00London Gatwick
20h 43m
2 stops
ONT22:43Ontario
£654
Delta
5 Oct
ONT09:52Ontario
16h 08m
1 stop
LHR10:00London Heathrow
16 Oct
LHR10:45London Heathrow
19h 16m
2 stops
ONT22:01Ontario
£671

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 4 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
Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 15/11

12:46-10:00

1 stop13h 14m

London Heathrow

Wed 16/12

14:45-22:19

1 stop15h 34m

£609

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 4/10

13:04-10:30

1 stop13h 26m

London Heathrow

Sun 25/10

14:45-23:52

1 stop16h 07m

£612

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 26/10

07:00-12:00

1 stop22h 00m

London Heathrow

Fri 13/11

19:05-09:57

2 stops22h 52m

£613

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 7/10

06:00-09:00

1 stop19h 00m

London Heathrow

Wed 14/10

16:10-21:54

1 stop13h 44m

£614

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 18/10

10:25-09:00

1 stop14h 35m

London Heathrow

Thu 29/10

08:20-21:11

1 stop19h 51m

£614

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 2/12

12:00-15:45

2 stops19h 45m

London Gatwick

Wed 9/12

10:00-22:43

2 stops20h 43m

£654

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Thu 8/10

06:20-09:30

2 stops19h 10m

London City

Thu 15/10

09:20-22:43

2 stops21h 23m

£704

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Wed 2/12

10:47-14:05

2 stops19h 18m

London City

Wed 9/12

07:50-22:19

2 stops22h 29m

£709

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Fri 14/8

13:56-13:45

2 stops39h 49m

London City

Fri 21/8

09:15-20:01

2 stops18h 46m

£871

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

£894

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 £188, 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 £211.

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 £704.

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 £575. Flights in the evening are often more expensive, with an average ticket price of £659.

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
Canterbury
Folkestone
Guildford
Hayes
Chichester
Hastings
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