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Cheap flights from Ontario to London from £250

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 28/2. 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.
Iberia Logo
07:00 - 08:35
ONT
-
LHR
17h 35m
1 stop
Iberia Logo
06:15 - 22:30
LHR
-
ONT
23h 15m
2 stops
£431Iberia
ons., 4 mar. - ons., 11 mar.
Iberia Logo
06:00 - 08:15
ONT
-
LHR
19h 15m
1 stop
Iberia Logo
11:30 - 23:46
LHR
-
ONT
20h 16m
2 stops
£443Iberia
tir., 24 mar. - tor., 16 apr.
British Airways Logo
16:45 - 13:15
ONT
-
LHR
12h 30m
1 stop
British Airways Logo
16:30 - 23:59
LHR
-
ONT
15h 29m
1 stop
£445British Airways
man., 2 feb. - tor., 26 feb.
British Airways Logo
17:02 - 13:15
ONT
-
LHR
12h 13m
1 stop
British Airways Logo
14:45 - 22:29
LHR
-
ONT
15h 44m
1 stop
£447British Airways
søn., 15 feb. - fre., 27 feb.
Iberia Logo
07:00 - 08:15
ONT
-
LHR
17h 15m
1 stop
Iberia Logo
20:50 - 22:29
LHR
-
ONT
33h 39m
2 stops
£448Iberia
tor., 19 feb. - tor., 26 feb.
British Airways Logo
15:09 - 12:15
ONT
-
LHR
13h 06m
1 stop
British Airways Logo
11:45 - 19:45
LHR
-
ONT
16h 00m
1 stop
£449British Airways
ons., 11 feb. - ons., 18 feb.
British Airways Logo
07:00 - 06:50
ONT
-
LHR
15h 50m
1 stop
British Airways Logo
10:15 - 18:42
LHR
-
ONT
15h 27m
1 stop
£451British Airways
tir., 3 mar. - tir., 10 mar.
British Airways Logo
15:09 - 12:15
ONT
-
LHR
13h 06m
1 stop
British Airways Logo
16:30 - 23:59
LHR
-
ONT
15h 29m
1 stop
£452British Airways
ons., 4 feb. - fre., 27 feb.
Iberia Logo
10:58 - 06:50
ONT
-
LHR
35h 52m
1 stop
Iberia Logo
08:55 - 22:49
LHR
-
ONT
21h 54m
1 stop
£456Iberia
lør., 31 jan. - tir., 31 mar.
British Airways Logo
14:39 - 11:40
ONT
-
LHR
13h 01m
1 stop
British Airways Logo
16:30 - 23:59
LHR
-
ONT
15h 29m
1 stop
£457British Airways
tor., 19 feb. - tor., 26 feb.

British Airways flights from Ontario to London Heathrow Airport

Our best British Airways deals on Ontario to London Heathrow Airport flight tickets
British Airways
2 Feb
ONT16:45Ontario
12h 30m
1 stop
LHR13:15London Heathrow
26 Feb
LHR16:30London Heathrow
15h 29m
1 stop
ONT23:59Ontario
£445
British Airways
15 Feb
ONT17:02Ontario
12h 13m
1 stop
LHR13:15London Heathrow
27 Feb
LHR14:45London Heathrow
15h 44m
1 stop
ONT22:29Ontario
£447
British Airways
11 Feb
ONT15:09Ontario
13h 06m
1 stop
LHR12:15London Heathrow
18 Feb
LHR11:45London Heathrow
16h 00m
1 stop
ONT19:45Ontario
£449

United Airlines flights from Ontario to London Heathrow Airport

Our best United Airlines deals on Ontario to London Heathrow Airport flight tickets
United Airlines
26 Feb
ONT13:40Ontario
14h 20m
1 stop
LHR12:00London Heathrow
5 Mar
LHR18:00London Heathrow
36h 18m
2 stops
ONT22:18Ontario
£478
United Airlines
5 Mar
ONT05:15Ontario
16h 40m
2 stops
LHR05:55London Heathrow
12 Mar
LHR08:30London Heathrow
21h 06m
2 stops
ONT22:36Ontario
£480
United Airlines
22 Mar
ONT05:15Ontario
21h 25m
1 stop
LHR09:40London Heathrow
15 Apr
LHR08:40London Heathrow
22h 05m
2 stops
ONT22:45Ontario
£480

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 21 januar 2026.
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

ons. 4/3

07:00-08:35

1 stop17h 35m

London Heathrow

ons. 11/3

06:15-22:30

2 stops23h 15m

£431

OntarioLondon

ONT - LHR

ONTLHR

Ontario

tir. 24/3

06:00-08:15

1 stop19h 15m

London Heathrow

tor. 16/4

11:30-23:46

2 stops20h 16m

£443

OntarioLondon

ONT - LHR

ONTLHR

Ontario

man. 2/2

16:45-13:15

1 stop12h 30m

London Heathrow

tor. 26/2

16:30-23:59

1 stop15h 29m

£445

OntarioLondon

ONT - LHR

ONTLHR

Ontario

søn. 15/2

17:02-13:15

1 stop12h 13m

London Heathrow

fre. 27/2

14:45-22:29

1 stop15h 44m

£447

OntarioLondon

ONT - LHR

ONTLHR

Ontario

tor. 19/2

07:00-08:15

1 stop17h 15m

London Heathrow

tor. 26/2

20:50-22:29

2 stops33h 39m

£448

OntarioLondon

ONT - LHR

ONTLHR

Ontario

ons. 11/2

15:09-12:15

1 stop13h 06m

London Heathrow

ons. 18/2

11:45-19:45

1 stop16h 00m

£449

OntarioLondon

ONT - LHR

ONTLHR

Ontario

tir. 3/3

07:00-06:50

1 stop15h 50m

London Heathrow

tir. 10/3

10:15-18:42

1 stop15h 27m

£451

OntarioLondon

ONT - LHR

ONTLHR

Ontario

ons. 4/2

15:09-12:15

1 stop13h 06m

London Heathrow

fre. 27/2

16:30-23:59

1 stop15h 29m

£452

OntarioLondon

ONT - LHR

ONTLHR

Ontario

lør. 31/1

10:58-06:50

1 stop35h 52m

London Heathrow

tir. 31/3

08:55-22:49

1 stop21h 54m

£456

OntarioLondon

ONT - LHR

ONTLHR

Ontario

tor. 19/2

14:39-11:40

1 stop13h 01m

London Heathrow

tor. 26/2

16:30-23:59

1 stop15h 29m

£457

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 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, November 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 £464. The month of December 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 £500. 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 £594.

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 £540. 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 £641 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 £629 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 £451 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

Fastest flight time

12h 30m

Direct flights

None
The fastest flight from Ontario to London Heathrow Airport takes 12h 30m
There are no direct flights from Ontario to London Heathrow Airport. There are no popular flight routes from Ontario to London Heathrow Airport.
Search flight deals

  • 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 30m.

  • 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
Luton
Milton Keynes
Gatwick
Maidstone
Slough
Northampton
Stratford-upon-Avon
Swindon
Southend-on-Sea
Canterbury
Ipswich
Ilford
Poole
Guildford
Chelmsford
Hayes
Swanage
Dover
Bedford

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.

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