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Cheap flights from Ontario to London from £190

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 3/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags
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Cheap return flights

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KLM Logo
07:05 - 07:50ONT-LHR
16h 45m1 stop
KLM Logo
06:30 - 17:09LHR-ONT
18h 39m2 stops
£477KLM
Find Deal
Tue, 18 Nov - Tue, 25 Nov
KLM Logo
07:05 - 07:50ONT-LHR
16h 45m1 stop
KLM Logo
06:30 - 17:07LHR-ONT
18h 37m2 stops
£484KLM
Find Deal
Tue, 18 Nov - Wed, 10 Dec
Delta Logo
06:00 - 07:05ONT-LHR
17h 05m2 stops
Delta Logo
08:40 - 23:04LHR-ONT
22h 24m2 stops
£487Delta
Find Deal
Wed, 19 Nov - Wed, 26 Nov
Air Canada Logo
05:05 - 06:30ONT-LHR
17h 25m2 stops
Air Canada Logo
14:30 - 12:37LHR-ONT
29h 07m2 stops
£487Air Canada
Find Deal
Sun, 19 Oct - Tue, 28 Oct
Air Canada Logo
05:05 - 07:10ONT-LHR
18h 05m2 stops
Air Canada Logo
14:30 - 22:53LHR-ONT
40h 23m2 stops
£493Air Canada
Find Deal
Sun, 11 Jan - Thu, 29 Jan
British Airways Logo
10:47 - 11:40ONT-LHR
16h 53m1 stop
British Airways Logo
11:55 - 22:28LHR-ONT
18h 33m1 stop
£499British Airways
Find Deal
Tue, 11 Nov - Tue, 9 Dec
British Airways Logo
16:47 - 13:15ONT-LHR
12h 28m1 stop
British Airways Logo
15:00 - 22:29LHR-ONT
15h 29m1 stop
£499British Airways
Find Deal
Tue, 11 Nov - Tue, 18 Nov
Virgin Atlantic Logo
11:48 - 10:30ONT-LHR
14h 42m1 stop
Virgin Atlantic Logo
06:30 - 22:55LHR-ONT
24h 25m2 stops
£500Virgin Atlantic
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Wed, 5 Nov - Wed, 12 Nov
Virgin Atlantic Logo
06:00 - 07:05ONT-LHR
17h 05m2 stops
Virgin Atlantic Logo
06:30 - 22:55LHR-ONT
24h 25m2 stops
£504Virgin Atlantic
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Wed, 5 Nov - Wed, 12 Nov
Delta Logo
11:48 - 10:30ONT-LHR
14h 42m1 stop
Delta Logo
14:45 - 22:55LHR-ONT
16h 10m1 stop
£505Delta
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Sun, 16 Nov - Tue, 25 Nov

British Airways flights from Ontario to London Heathrow Airport

Our best British Airways deals on Ontario to London Heathrow Airport flight tickets
British Airways
11 Nov
ONT10:47Ontario
16h 53m
1 stop
LHR11:40London Heathrow
9 Dec
LHR11:55London Heathrow
18h 33m
1 stop
ONT22:28Ontario
£499
Find similar
British Airways
11 Nov
ONT16:47Ontario
12h 28m
1 stop
LHR13:15London Heathrow
18 Nov
LHR15:00London Heathrow
15h 29m
1 stop
ONT22:29Ontario
£499
Find similar
British Airways
3 Feb
ONT16:49Ontario
12h 26m
1 stop
LHR13:15London Heathrow
10 Feb
LHR15:00London Heathrow
15h 49m
1 stop
ONT22:49Ontario
£505
Find similar

JetBlue flights from Ontario to London Heathrow Airport

Our best JetBlue deals on Ontario to London Heathrow Airport flight tickets
JetBlue
7 Oct
ONT22:56Ontario
13h 49m
1 stop
LHR20:45London Heathrow
11 Oct
LHR08:15London Heathrow
21h 14m
1 stop
ONT21:29Ontario
£587
Find similar
JetBlue
14 Oct
ONT22:56Ontario
13h 49m
1 stop
LHR20:45London Heathrow
21 Oct
LHR11:55London Heathrow
17h 34m
1 stop
ONT21:29Ontario
£598
Find similar
JetBlue
16 Oct
ONT22:56Ontario
13h 49m
1 stop
LHR20:45London Heathrow
22 Oct
LHR11:55London Heathrow
17h 34m
1 stop
ONT21:29Ontario
£609
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Ontario to London Heathrow Airport 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 6 October 2025.
Use the filters below to find and compare flights from Ontario to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 18/11

07:05-07:50

1 stop16h 45m

London Heathrow

Tue 25/11

06:30-17:09

2 stops18h 39m

£477

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 18/11

07:05-07:50

1 stop16h 45m

London Heathrow

Wed 10/12

06:30-17:07

2 stops18h 37m

£484

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 19/11

06:00-07:05

2 stops17h 05m

London Heathrow

Wed 26/11

08:40-23:04

2 stops22h 24m

£487

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 19/10

05:05-06:30

2 stops17h 25m

London Heathrow

Tue 28/10

14:30-12:37

2 stops29h 07m

£487

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 11/1

05:05-07:10

2 stops18h 05m

London Heathrow

Thu 29/1

14:30-22:53

2 stops40h 23m

£493

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/11

10:47-11:40

1 stop16h 53m

London Heathrow

Tue 9/12

11:55-22:28

1 stop18h 33m

£499

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/11

16:47-13:15

1 stop12h 28m

London Heathrow

Tue 18/11

15:00-22:29

1 stop15h 29m

£499

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 5/11

11:48-10:30

1 stop14h 42m

London Heathrow

Wed 12/11

06:30-22:55

2 stops24h 25m

£500

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 5/11

06:00-07:05

2 stops17h 05m

London Heathrow

Wed 12/11

06:30-22:55

2 stops24h 25m

£504

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 16/11

11:48-10:30

1 stop14h 42m

London Heathrow

Tue 25/11

14:45-22:55

1 stop16h 10m

£504

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 Heathrow Airport

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 Heathrow Airport?

In general, March is the cheapest month to fly from Ontario to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £492. The month of September is another great option to travel to London Heathrow Airport, with average flight prices from Ontario averaging around £511.

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from Ontario is on a Monday. momondo users have found tickets for Monday departures for as low as £507. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £587.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Ontario to London Heathrow Airport in the afternoon for as low as £537. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying at midday when prices are £652 on average. Flights to London Heathrow Airport from Ontario at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £640 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Ontario for as low as £450 on momondo.

When to book flights from Ontario to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Ontario to London Heathrow Airport (ONT to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to London Heathrow Airport

Direct flights

None
There are no direct flights from Ontario to London Heathrow Airport. There are no popular flight routes from Ontario to London Heathrow Airport.
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  • How far is Ontario to London Heathrow by plane?

    London Heathrow is 5408.1 mi away from Ontario. In terms of flight time, this usually takes a little over 12h 01m.

  • When did momondo last update prices for flights from Ontario Airport to London Heathrow Airport?

    Prices for flights from Ontario Airport to London Heathrow Airport refresh daily.

  • How old do you have to be to fly from Ontario Airport to London Heathrow Airport?

    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 Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents you'll need for your trip to London Heathrow Airport 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 Heathrow Airport. 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
Maidstone
Gatwick
Northampton
Slough
Swindon
Canterbury
Stratford-upon-Avon
Southend-on-Sea
Ipswich
Ilford
Guildford
Poole
Swanage
Colchester
Dover
Hayes
Chelmsford

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to London?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to London . Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to London with flexible booking policies on momondo?

Flights from Ontario to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Ontario to London?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Ontario.

I’m not ready to book a flight from Ontario to London right now. Can momondo alert me if prices change?

Price alerts on flights to London from Ontario are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your London Heathrow Airport trip

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