Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Ontario to London from £209

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 4/8. 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
Voted winner of Europe's Best Travel App 2023

Find the cheapest flights from Ontario to London

Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
14:22 - 12:50
ONT
-
LHR
14h 28m
1 stop
British Airways Logo
14:45 - 23:06
LHR
-
ONT
15h 21m
1 stop
£621British Airways
Sun, 18 Oct - Thu, 29 Oct
Multiple Airlines Logo
06:00 - 10:00
ONT
-
LHR
20h 00m
2 stops
Multiple Airlines Logo
08:20 - 21:08
LHR
-
ONT
19h 48m
1 stop
£623Multiple Airlines
Sun, 18 Oct - Thu, 29 Oct
Multiple Airlines Logo
10:47 - 12:00
ONT
-
LHR
17h 13m
1 stop
Multiple Airlines Logo
14:45 - 23:55
LHR
-
ONT
17h 10m
1 stop
£624Multiple Airlines
Tue, 17 Nov - Tue, 15 Dec
British Airways Logo
13:05 - 10:30
ONT
-
LHR
13h 25m
1 stop
British Airways Logo
10:15 - 18:57
LHR
-
ONT
15h 42m
1 stop
£625British Airways
Sun, 4 Oct - Sat, 31 Oct
Multiple Airlines Logo
06:00 - 12:20
ONT
-
LHR
22h 20m
1 stop
Multiple Airlines Logo
14:45 - 22:19
LHR
-
ONT
15h 34m
1 stop
£625Multiple Airlines
Tue, 10 Nov - Mon, 7 Dec
Multiple Airlines Logo
07:00 - 09:15
ONT
-
LHR
18h 15m
2 stops
Multiple Airlines Logo
14:45 - 22:19
LHR
-
ONT
15h 34m
1 stop
£630Multiple Airlines
Tue, 17 Nov - Tue, 15 Dec
Delta Logo
07:05 - 09:25
ONT
-
LGW
18h 20m
2 stops
Delta Logo
10:35 - 22:40
LGW
-
ONT
20h 05m
2 stops
£730Delta
Tue, 1 Sep - Tue, 15 Sep
Delta Logo
07:05 - 09:25
ONT
-
LGW
18h 20m
2 stops
Delta Logo
10:25 - 22:45
LGW
-
ONT
20h 20m
2 stops
£745Delta
Sun, 9 Aug - Wed, 19 Aug
Iberia Logo
10:29 - 13:20
ONT
-
LCY
18h 51m
2 stops
Iberia Logo
09:35 - 22:59
LCY
-
ONT
21h 24m
2 stops
£788Iberia
Mon, 10 Aug - Wed, 19 Aug
Iberia Logo
10:29 - 15:15
ONT
-
LCY
20h 46m
2 stops
Iberia Logo
09:35 - 23:06
LCY
-
ONT
21h 31m
2 stops
£790Iberia
Sun, 6 Sep - Tue, 20 Oct

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Air Canada flights from Ontario to London

Our best Air Canada deals on Ontario to London flight tickets
Air Canada
18 Oct
ONT06:00Ontario
47h 20m
2 stops
LHR13:20London Heathrow
29 Oct
LHR14:30London Heathrow
37h 26m
2 stops
ONT20:56Ontario
£656
Air Canada
1 Sept
ONT05:00Ontario
21h 00m
2 stops
LHR10:00London Heathrow
16 Sept
LHR09:30London Heathrow
43h 23m
2 stops
ONT20:53Ontario
£685
Air Canada
3 Aug
ONT05:00Ontario
22h 50m
2 stops
LHR11:50London Heathrow
20 Aug
LHR15:00London Heathrow
35h 11m
2 stops
ONT18:11Ontario
£686

Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets
Delta
3 Aug
ONT06:00Ontario
20h 00m
1 stop
LHR10:00London Heathrow
20 Aug
LHR06:30London Heathrow
23h 22m
2 stops
ONT21:52Ontario
£676
Delta
3 Aug
ONT06:00Ontario
23h 05m
2 stops
LHR13:05London Heathrow
20 Aug
LHR06:30London Heathrow
25h 04m
2 stops
ONT23:34Ontario
£679
Delta
23 Aug
ONT11:56Ontario
19h 39m
1 stop
LHR15:35London Heathrow
8 Sept
LHR06:15London Heathrow
19h 05m
2 stops
ONT17:20Ontario
£681

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 22 June 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

Sun 18/10

14:22-12:50

1 stop14h 28m

London Heathrow

Thu 29/10

14:45-23:06

1 stop15h 21m

£621

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 18/10

06:00-10:00

2 stops20h 00m

London Heathrow

Thu 29/10

08:20-21:08

1 stop19h 48m

£623

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 17/11

10:47-12:00

1 stop17h 13m

London Heathrow

Tue 15/12

14:45-23:55

1 stop17h 10m

£624
Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 4/10

13:05-10:30

1 stop13h 25m

London Heathrow

Sat 31/10

10:15-18:57

1 stop15h 42m

£625

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/11

06:00-12:20

1 stop22h 20m

London Heathrow

Mon 7/12

14:45-22:19

1 stop15h 34m

£625

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 17/11

07:00-09:15

2 stops18h 15m

London Heathrow

Tue 15/12

14:45-22:19

1 stop15h 34m

£630

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 1/9

07:05-09:25

2 stops18h 20m

London Gatwick

Tue 15/9

10:35-22:40

2 stops20h 05m

£730

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Sun 9/8

07:05-09:25

2 stops18h 20m

London Gatwick

Wed 19/8

10:25-22:45

2 stops20h 20m

£745

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Mon 10/8

10:29-13:20

2 stops18h 51m

London City

Wed 19/8

09:35-22:59

2 stops21h 24m

£788

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Sun 6/9

10:29-15:15

2 stops20h 46m

London City

Tue 20/10

09:35-23:06

2 stops21h 31m

£790

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 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 £190, 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 £213.

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 £566. 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 £705.

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 £581. Flights in the evening are often more expensive, with an average ticket price of £656.

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

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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 22/7
Wed 29/7
By creating a price alert you accept our terms of use and privacy policy.

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