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Cheap flights from Ontario to London from £273

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 16/7. 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
10:59 - 08:05
ONT
-
LHR
13h 06m
1 stop
British Airways Logo
10:05 - 16:22
LHR
-
ONT
14h 17m
1 stop
£552British Airways
Mon, 27 Apr - Wed, 6 May
American Airlines Logo
06:00 - 08:40
ONT
-
LGW
18h 40m
2 stops
American Airlines Logo
14:30 - 10:09
LGW
-
ONT
27h 39m
2 stops
£556American Airlines
Wed, 6 May - Wed, 13 May
Iberia Logo
07:00 - 08:05
ONT
-
LHR
17h 05m
1 stop
Iberia Logo
06:10 - 20:54
LHR
-
ONT
22h 44m
2 stops
£558Iberia
Sun, 5 Apr - Tue, 21 Apr
Iberia Logo
14:08 - 14:25
ONT
-
LHR
16h 17m
1 stop
Iberia Logo
06:10 - 20:54
LHR
-
ONT
22h 44m
2 stops
£560Iberia
Tue, 14 Apr - Tue, 21 Apr
Delta Logo
11:53 - 12:10
ONT
-
LHR
16h 17m
1 stop
Delta Logo
11:45 - 22:37
LHR
-
ONT
18h 52m
2 stops
£560Delta
Wed, 15 Apr - Tue, 5 May
Delta Logo
06:00 - 07:10
ONT
-
LHR
17h 10m
2 stops
Delta Logo
09:55 - 22:37
LHR
-
ONT
20h 42m
2 stops
£563Delta
Wed, 15 Apr - Tue, 5 May
Delta Logo
14:20 - 16:00
ONT
-
LGW
17h 40m
2 stops
Delta Logo
10:35 - 21:00
LGW
-
ONT
18h 25m
2 stops
£569Delta
Wed, 15 Apr - Tue, 5 May
British Airways Logo
10:56 - 08:05
ONT
-
LHR
13h 09m
1 stop
British Airways Logo
10:05 - 16:22
LHR
-
ONT
14h 17m
1 stop
£573British Airways
Tue, 31 Mar - Wed, 15 Apr
Multiple Airlines Logo
16:54 - 15:05
ONT
-
LHR
14h 11m
1 stop
Multiple Airlines Logo
16:10 - 21:39
LHR
-
ONT
13h 29m
1 stop
£582Multiple Airlines
Mon, 17 Aug - Wed, 2 Sep
Multiple Airlines Logo
10:33 - 17:30
ONT
-
LCY
23h 57m
2 stops
Multiple Airlines Logo
09:15 - 21:50
LCY
-
ONT
20h 35m
2 stops
£1,267Multiple Airlines
Mon, 23 Mar - Tue, 31 Mar

Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets
Delta
15 Apr
ONT11:53Ontario
16h 17m
1 stop
LHR12:10London Heathrow
5 May
LHR11:45London Heathrow
18h 52m
2 stops
ONT22:37Ontario
£560
Delta
15 Apr
ONT06:00Ontario
17h 10m
2 stops
LHR07:10London Heathrow
5 May
LHR09:55London Heathrow
20h 42m
2 stops
ONT22:37Ontario
£563
Delta
15 Apr
ONT14:20Ontario
17h 40m
2 stops
LGW16:00London Gatwick
5 May
LGW10:35London Gatwick
18h 25m
2 stops
ONT21:00Ontario
£569

British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets
British Airways
27 Apr
ONT10:59Ontario
13h 06m
1 stop
LHR08:05London Heathrow
6 May
LHR10:05London Heathrow
14h 17m
1 stop
ONT16:22Ontario
£552
British Airways
31 Mar
ONT10:56Ontario
13h 09m
1 stop
LHR08:05London Heathrow
15 Apr
LHR10:05London Heathrow
14h 17m
1 stop
ONT16:22Ontario
£573
British Airways
31 Mar
ONT10:56Ontario
13h 09m
1 stop
LHR08:05London Heathrow
10 Apr
LHR10:05London Heathrow
14h 17m
1 stop
ONT16:22Ontario
£576

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 March 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

Mon 27/4

10:59-08:05

1 stop13h 06m

London Heathrow

Wed 6/5

10:05-16:22

1 stop14h 17m

£552

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 6/5

06:00-08:40

2 stops18h 40m

London Gatwick

Wed 13/5

14:30-10:09

2 stops27h 39m

£556

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 5/4

07:00-08:05

1 stop17h 05m

London Heathrow

Tue 21/4

06:10-20:54

2 stops22h 44m

£558

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 14/4

14:08-14:25

1 stop16h 17m

London Heathrow

Tue 21/4

06:10-20:54

2 stops22h 44m

£560

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 15/4

11:53-12:10

1 stop16h 17m

London Heathrow

Tue 5/5

11:45-22:37

2 stops18h 52m

£560

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 15/4

06:00-07:10

2 stops17h 10m

London Heathrow

Tue 5/5

09:55-22:37

2 stops20h 42m

£563

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 15/4

14:20-16:00

2 stops17h 40m

London Gatwick

Tue 5/5

10:35-21:00

2 stops18h 25m

£569

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 31/3

10:56-08:05

1 stop13h 09m

London Heathrow

Wed 15/4

10:05-16:22

1 stop14h 17m

£573

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 17/8

16:54-15:05

1 stop14h 11m

London Heathrow

Wed 2/9

16:10-21:39

1 stop13h 29m

£582

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Mon 23/3

10:33-17:30

2 stops23h 57m

London City

Tue 31/3

09:15-21:50

2 stops20h 35m

£1,267

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 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 £491, are often lower during this time because this is during the off-season. The month of April is another great option to travel to London, with average flight prices from Ontario averaging around £492.

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 £497. 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 £601.

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 £513. Flights at midday are often more expensive, with an average ticket price of £650.

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

  • 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
Milton Keynes
Luton
Gatwick
Maidstone
Slough
Southend-on-Sea
Ipswich
Canterbury
Ilford
Wembley
Guildford
Chelmsford
Hayes
Dover
Folkestone
Ramsgate
Worthing
Colchester
Chichester

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