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Cheap flights from Ontario to London from £235

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 11/1. 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

Find the cheapest flights from Ontario to London

Cheap return flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
12:00 - 12:20
ONT
-
LHR
16h 20m
1 stop
Alaska Airlines Logo
14:45 - 11:09
LHR
-
ONT
28h 24m
1 stop
£597Alaska Airlines
Sun, 10 Jan - Sun, 24 Jan
Alaska Airlines Logo
12:00 - 12:20
ONT
-
LHR
16h 20m
1 stop
Alaska Airlines Logo
14:45 - 22:39
LHR
-
ONT
15h 54m
1 stop
£603Alaska Airlines
Tue, 5 Jan - Mon, 11 Jan
Multiple Airlines Logo
09:59 - 12:15
ONT
-
LHR
18h 16m
1 stop
Multiple Airlines Logo
14:45 - 22:39
LHR
-
ONT
15h 54m
1 stop
£603Multiple Airlines
Wed, 6 Jan - Thu, 21 Jan
Multiple Airlines Logo
12:42 - 10:00
ONT
-
LHR
13h 18m
1 stop
Multiple Airlines Logo
14:45 - 22:54
LHR
-
ONT
16h 09m
1 stop
£603Multiple Airlines
Sun, 8 Nov - Wed, 18 Nov
Multiple Airlines Logo
09:29 - 12:15
ONT
-
LHR
18h 46m
1 stop
Multiple Airlines Logo
14:45 - 23:04
LHR
-
ONT
16h 19m
1 stop
£603Multiple Airlines
Mon, 16 Nov - Sat, 21 Nov
Alaska Airlines Logo
06:00 - 12:20
ONT
-
LHR
22h 20m
1 stop
Alaska Airlines Logo
14:45 - 23:04
LHR
-
ONT
16h 19m
1 stop
£603Alaska Airlines
Wed, 11 Nov - Mon, 23 Nov
Multiple Airlines Logo
15:09 - 12:15
ONT
-
LHR
13h 06m
1 stop
Multiple Airlines Logo
14:45 - 22:39
LHR
-
ONT
15h 54m
1 stop
£603Multiple Airlines
Wed, 13 Jan - Wed, 20 Jan
Multiple Airlines Logo
15:09 - 12:15
ONT
-
LHR
13h 06m
1 stop
Multiple Airlines Logo
14:45 - 22:39
LHR
-
ONT
15h 54m
1 stop
£603Multiple Airlines
Wed, 13 Jan - Sun, 24 Jan
Multiple Airlines Logo
12:42 - 10:00
ONT
-
LHR
13h 18m
1 stop
Multiple Airlines Logo
14:45 - 22:39
LHR
-
ONT
15h 54m
1 stop
£603Multiple Airlines
Tue, 1 Dec - Wed, 9 Dec
Alaska Airlines Logo
06:02 - 12:20
ONT
-
LHR
23h 18m
1 stop
Alaska Airlines Logo
14:45 - 22:54
LHR
-
ONT
16h 09m
1 stop
£603Alaska Airlines
Tue, 27 Oct - Sun, 1 Nov

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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets
Alaska Airlines
10 Jan
ONT12:00Ontario
16h 20m
1 stop
LHR12:20London Heathrow
24 Jan
LHR14:45London Heathrow
28h 24m
1 stop
ONT11:09Ontario
£597
Alaska Airlines
26 Oct
ONT06:02Ontario
23h 18m
1 stop
LHR12:20London Heathrow
31 Oct
LHR14:45London Heathrow
28h 33m
1 stop
ONT12:18Ontario
£606
Alaska Airlines
18 Nov
ONT12:00Ontario
16h 20m
1 stop
LHR12:20London Heathrow
25 Nov
LHR14:45London Heathrow
32h 20m
1 stop
ONT15:05Ontario
£607

British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets
British Airways
18 Nov
ONT12:42Ontario
13h 18m
1 stop
LHR10:00London Heathrow
28 Nov
LHR13:15London Heathrow
13h 50m
1 stop
ONT19:05Ontario
£621
British Airways
11 Jan
ONT15:09Ontario
13h 06m
1 stop
LHR12:15London Heathrow
16 Jan
LHR14:45London Heathrow
16h 04m
1 stop
ONT22:49Ontario
£628
British Airways
22 Nov
ONT12:42Ontario
13h 18m
1 stop
LHR10:00London Heathrow
29 Nov
LHR13:15London Heathrow
13h 50m
1 stop
ONT19:05Ontario
£643

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 29 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

Sun 10/1

12:00-12:20

1 stop16h 20m

London Heathrow

Sun 24/1

14:45-11:09

1 stop28h 24m

£597

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 5/1

12:00-12:20

1 stop16h 20m

London Heathrow

Mon 11/1

14:45-22:39

1 stop15h 54m

£603

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 6/1

09:59-12:15

1 stop18h 16m

London Heathrow

Thu 21/1

14:45-22:39

1 stop15h 54m

£603

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 8/11

12:42-10:00

1 stop13h 18m

London Heathrow

Wed 18/11

14:45-22:54

1 stop16h 09m

£603

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 16/11

09:29-12:15

1 stop18h 46m

London Heathrow

Sat 21/11

14:45-23:04

1 stop16h 19m

£603

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 11/11

06:00-12:20

1 stop22h 20m

London Heathrow

Mon 23/11

14:45-23:04

1 stop16h 19m

£603
Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 13/1

15:09-12:15

1 stop13h 06m

London Heathrow

Wed 20/1

14:45-22:39

1 stop15h 54m

£603

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 13/1

15:09-12:15

1 stop13h 06m

London Heathrow

Sun 24/1

14:45-22:39

1 stop15h 54m

£603

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 1/12

12:42-10:00

1 stop13h 18m

London Heathrow

Wed 9/12

14:45-22:39

1 stop15h 54m

£603

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 27/10

06:02-12:20

1 stop23h 18m

London Heathrow

Sun 1/11

14:45-22:54

1 stop16h 09m

£603

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?

Prices are currently low for flights on this route.

Typical prices usually range from £619 to £816.
The lowest price recently found on this route was £597.

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 £490, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Ontario averaging around £509.

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 £636. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to London for around £770.

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 £460. Flights in the afternoon are often more expensive, with an average ticket price of £702.

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
Hastings
Canterbury
Guildford
Chichester
Bedford
Hayes
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