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Cheap flights from Ontario to London from £263

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 14/6. 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.
British Airways Logo
10:54 - 08:05
ONT
-
LHR
13h 11m
1 stop
British Airways Logo
10:05 - 16:22
LHR
-
ONT
14h 17m
1 stop
£652British Airways
Sun, 3 May - Tue, 19 May
British Airways Logo
10:54 - 08:05
ONT
-
LHR
13h 11m
1 stop
British Airways Logo
10:05 - 16:22
LHR
-
ONT
14h 17m
1 stop
£654British Airways
Sun, 3 May - Tue, 19 May
Virgin Atlantic Logo
17:55 - 15:35
ONT
-
LHR
13h 40m
1 stop
Virgin Atlantic Logo
11:45 - 22:34
LHR
-
ONT
18h 49m
2 stops
£655Virgin Atlantic
Sun, 26 Apr - Tue, 12 May
British Airways Logo
10:54 - 08:05
ONT
-
LHR
13h 11m
1 stop
British Airways Logo
10:05 - 16:22
LHR
-
ONT
14h 17m
1 stop
£656British Airways
Sun, 3 May - Tue, 19 May
Virgin Atlantic Logo
12:49 - 07:15
ONT
-
LHR
34h 26m
1 stop
Virgin Atlantic Logo
08:40 - 22:34
LHR
-
ONT
21h 54m
2 stops
£658Virgin Atlantic
Sat, 2 May - Fri, 15 May
KLM Logo
14:00 - 15:35
ONT
-
LHR
17h 35m
1 stop
KLM Logo
06:30 - 16:14
LHR
-
ONT
17h 44m
2 stops
£659KLM
Sun, 23 Aug - Tue, 8 Sep
KLM Logo
11:55 - 15:35
ONT
-
LHR
19h 40m
1 stop
KLM Logo
06:30 - 16:14
LHR
-
ONT
17h 44m
2 stops
£660KLM
Sun, 23 Aug - Tue, 8 Sep
Delta Logo
07:05 - 10:20
ONT
-
LHR
19h 15m
2 stops
Delta Logo
06:30 - 17:10
LHR
-
ONT
18h 40m
2 stops
£663Delta
Tue, 5 May - Tue, 12 May
Delta Logo
14:20 - 16:00
ONT
-
LGW
17h 40m
2 stops
Delta Logo
10:35 - 22:34
LGW
-
ONT
19h 59m
2 stops
£668Delta
Tue, 5 May - Tue, 12 May
Air France Logo
09:55 - 16:00
ONT
-
LGW
22h 05m
2 stops
Air France Logo
17:00 - 16:12
LGW
-
ONT
31h 12m
2 stops
£677Air France
Tue, 6 Oct - Tue, 13 Oct

Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets
Delta
5 May
ONT07:05Ontario
19h 15m
2 stops
LHR10:20London Heathrow
12 May
LHR06:30London Heathrow
18h 40m
2 stops
ONT17:10Ontario
£663
Delta
23 Aug
ONT07:00Ontario
16h 55m
2 stops
LHR07:55London Heathrow
8 Sept
LHR11:45London Heathrow
18h 55m
2 stops
ONT22:40Ontario
£663
Delta
5 May
ONT14:20Ontario
17h 40m
2 stops
LGW16:00London Gatwick
12 May
LGW10:35London Gatwick
19h 59m
2 stops
ONT22:34Ontario
£668

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets
Iberia
5 May
ONT07:30Ontario
20h 40m
1 stop
LHR12:10London Heathrow
12 May
LHR20:00London Heathrow
35h 46m
2 stops
ONT23:46Ontario
£664
Iberia
29 Apr
ONT10:59Ontario
12h 56m
1 stop
LHR07:55London Heathrow
7 May
LHR16:25London Heathrow
15h 21m
1 stop
ONT23:46Ontario
£680
Iberia
26 Apr
ONT07:30Ontario
16h 35m
1 stop
LHR08:05London Heathrow
12 May
LHR08:55London Heathrow
19h 59m
1 stop
ONT20:54Ontario
£683

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 16 April 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 3/5

10:54-08:05

1 stop13h 11m

London Heathrow

Tue 19/5

10:05-16:22

1 stop14h 17m

£652

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 3/5

10:54-08:05

1 stop13h 11m

London Heathrow

Tue 19/5

10:05-16:22

1 stop14h 17m

£654

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 26/4

17:55-15:35

1 stop13h 40m

London Heathrow

Tue 12/5

11:45-22:34

2 stops18h 49m

£655

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 3/5

10:54-08:05

1 stop13h 11m

London Heathrow

Tue 19/5

10:05-16:22

1 stop14h 17m

£656

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 2/5

12:49-07:15

1 stop34h 26m

London Heathrow

Fri 15/5

08:40-22:34

2 stops21h 54m

£658

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 23/8

14:00-15:35

1 stop17h 35m

London Heathrow

Tue 8/9

06:30-16:14

2 stops17h 44m

£659

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 23/8

11:55-15:35

1 stop19h 40m

London Heathrow

Tue 8/9

06:30-16:14

2 stops17h 44m

£660

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 5/5

07:05-10:20

2 stops19h 15m

London Heathrow

Tue 12/5

06:30-17:10

2 stops18h 40m

£663

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 5/5

14:20-16:00

2 stops17h 40m

London Gatwick

Tue 12/5

10:35-22:34

2 stops19h 59m

£668

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 6/10

09:55-16:00

2 stops22h 05m

London Gatwick

Tue 13/10

17:00-16:12

2 stops31h 12m

£677

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 March. Flight prices, which tend to average around £425, are often lower during this time because this is during the off-season. The month of September is another great option to travel to London, with average flight prices from Ontario averaging around £448.

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 £486. 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 £614.

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 £520. Flights at midday are often more expensive, with an average ticket price of £633.

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

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.

An easier way to manage your London trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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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