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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 14/10. 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.
Iberia Logo
06:10 - 10:00
ONT
-
LHR
19h 50m
1 stop
Iberia Logo
19:40 - 09:54
LHR
-
ONT
22h 14m
2 stops
£610Iberia
Tue, 1 Dec - Fri, 11 Dec
British Airways Logo
12:43 - 12:50
ONT
-
LHR
16h 07m
1 stop
British Airways Logo
16:25 - 09:35
LHR
-
ONT
25h 10m
1 stop
£612British Airways
Mon, 19 Oct - Tue, 20 Oct
Multiple Airlines Logo
09:00 - 11:50
ONT
-
LHR
18h 50m
2 stops
Multiple Airlines Logo
08:20 - 22:19
LHR
-
ONT
21h 59m
1 stop
£612Multiple Airlines
Mon, 23 Nov - Fri, 4 Dec
British Airways Logo
15:09 - 12:00
ONT
-
LHR
12h 51m
1 stop
British Airways Logo
14:45 - 22:49
LHR
-
ONT
16h 04m
1 stop
£618British Airways
Sun, 10 Jan - Sat, 16 Jan
British Airways Logo
15:09 - 12:15
ONT
-
LHR
13h 06m
1 stop
British Airways Logo
11:15 - 18:45
LHR
-
ONT
15h 30m
1 stop
£619British Airways
Mon, 11 Jan - Mon, 25 Jan
Multiple Airlines Logo
08:03 - 13:20
ONT
-
LHR
21h 17m
2 stops
Multiple Airlines Logo
17:00 - 10:21
LHR
-
ONT
25h 21m
1 stop
£621Multiple Airlines
Tue, 13 Oct - Thu, 15 Oct
Multiple Airlines Logo
09:00 - 11:50
ONT
-
LHR
18h 50m
2 stops
Multiple Airlines Logo
15:45 - 09:54
LHR
-
ONT
26h 09m
2 stops
£622Multiple Airlines
Mon, 23 Nov - Fri, 4 Dec
Delta Logo
07:00 - 15:45
ONT
-
LGW
24h 45m
2 stops
Delta Logo
10:00 - 16:12
LGW
-
ONT
38h 12m
2 stops
£703Delta
Mon, 28 Dec - Wed, 6 Jan
Delta Logo
06:20 - 16:00
ONT
-
LGW
25h 40m
2 stops
Delta Logo
10:25 - 22:45
LGW
-
ONT
20h 20m
2 stops
£704Delta
Mon, 17 Aug - Thu, 27 Aug
KLM Logo
07:00 - 07:15
ONT
-
LCY
16h 15m
2 stops
KLM Logo
07:45 - 18:18
LCY
-
ONT
18h 33m
2 stops
£920KLM
Mon, 23 Nov - Fri, 4 Dec

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British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets
British Airways
14 Oct
ONT07:00Ontario
21h 50m
1 stop
LHR12:50London Heathrow
20 Oct
LHR16:25London Heathrow
25h 10m
1 stop
ONT09:35Ontario
£612
British Airways
23 Nov
ONT12:46Ontario
13h 14m
1 stop
LHR10:00London Heathrow
4 Dec
LHR08:20London Heathrow
23h 35m
1 stop
ONT23:55Ontario
£612
British Airways
10 Jan
ONT15:09Ontario
12h 51m
1 stop
LHR12:00London Heathrow
16 Jan
LHR14:45London Heathrow
16h 04m
1 stop
ONT22:49Ontario
£618

Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets
Alaska Airlines
20 Oct
ONT14:13Ontario
16h 52m
1 stop
LHR15:05London Heathrow
27 Oct
LHR14:45London Heathrow
16h 00m
1 stop
ONT23:45Ontario
£643
Alaska Airlines
21 Oct
ONT14:13Ontario
16h 52m
1 stop
LHR15:05London Heathrow
30 Oct
LHR14:45London Heathrow
16h 00m
1 stop
ONT23:45Ontario
£649
Alaska Airlines
24 Oct
ONT18:56Ontario
34h 24m
1 stop
LHR12:20London Heathrow
6 Nov
LHR14:45London Heathrow
16h 09m
1 stop
ONT22:54Ontario
£653

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 17 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 1/12

06:10-10:00

1 stop19h 50m

London Heathrow

Fri 11/12

19:40-09:54

2 stops22h 14m

£610

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 19/10

12:43-12:50

1 stop16h 07m

London Heathrow

Tue 20/10

16:25-09:35

1 stop25h 10m

£612

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 23/11

09:00-11:50

2 stops18h 50m

London Heathrow

Fri 4/12

08:20-22:19

1 stop21h 59m

£612

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 10/1

15:09-12:00

1 stop12h 51m

London Heathrow

Sat 16/1

14:45-22:49

1 stop16h 04m

£618
Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 11/1

15:09-12:15

1 stop13h 06m

London Heathrow

Mon 25/1

11:15-18:45

1 stop15h 30m

£619

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 13/10

08:03-13:20

2 stops21h 17m

London Heathrow

Thu 15/10

17:00-10:21

1 stop25h 21m

£621

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 23/11

09:00-11:50

2 stops18h 50m

London Heathrow

Fri 4/12

15:45-09:54

2 stops26h 09m

£622

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 28/12

07:00-15:45

2 stops24h 45m

London Gatwick

Wed 6/1

10:00-16:12

2 stops38h 12m

£703

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 17/8

06:20-16:00

2 stops25h 40m

London Gatwick

Thu 27/8

10:25-22:45

2 stops20h 20m

£704

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Mon 23/11

07:00-07:15

2 stops16h 15m

London City

Fri 4/12

07:45-18:18

2 stops18h 33m

£920

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 £186, 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 £209.

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 £606. 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 £706.

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 £569. Flights in the evening are often more expensive, with an average ticket price of £674.

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
Ipswich
Maidstone
Folkestone
Ilford
Canterbury
Guildford
Hastings
Hayes
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