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Cheap flights from Ontario to London from £290

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 28/9. 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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Find the cheapest flights from Ontario to London (ONT-LHR)

Cheap return flights

Delta Logo
06:45 - 12:50ONT-LHR
22h 05m1 stop
Delta Logo
08:55 - 21:14LHR-ONT
20h 19m2 stops
£386Delta
Find Deal
Tue, 30 Dec - Fri, 9 Jan
Delta Logo
11:50 - 14:15ONT-LHR
18h 25m1 stop
Delta Logo
11:30 - 22:41LHR-ONT
19h 11m2 stops
£386Delta
Find Deal
Wed, 1 Oct - Wed, 8 Oct
Delta Logo
11:55 - 11:25ONT-LHR
15h 30m2 stops
Delta Logo
11:30 - 22:41LHR-ONT
19h 11m2 stops
£389Delta
Find Deal
Wed, 1 Oct - Wed, 8 Oct
Virgin Atlantic Logo
06:00 - 11:20ONT-LHR
21h 20m1 stop
Virgin Atlantic Logo
11:00 - 23:39LHR-ONT
20h 39m1 stop
£392Virgin Atlantic
Find Deal
Wed, 1 Oct - Wed, 8 Oct
Virgin Atlantic Logo
07:05 - 09:00ONT-LHR
18h 55m1 stop
Virgin Atlantic Logo
06:20 - 22:41LHR-ONT
24h 21m2 stops
£423Virgin Atlantic
Find Deal
Fri, 31 Oct - Tue, 4 Nov
United Airlines Logo
13:15 - 09:40ONT-LHR
12h 25m1 stop
United Airlines Logo
14:50 - 20:24LHR-ONT
13h 34m1 stop
£448United Airlines
Find Deal
Mon, 6 Oct - Wed, 22 Oct
Logo
11:56 - 09:00ONT-LHR
13h 04m1 stop
Logo
10:45 - 16:19LHR-ONT
13h 34m1 stop
£458
Find Deal
Tue, 23 Dec - Sat, 10 Jan
Logo
06:00 - 06:50ONT-LHR
16h 50m2 stops
Logo
12:20 - 22:38LHR-ONT
18h 18m1 stop
£459
Find Deal
Fri, 9 Jan - Sun, 18 Jan
KLM Logo
11:40 - 14:15ONT-LHR
18h 35m1 stop
KLM Logo
09:20 - 22:23LHR-ONT
21h 03m1 stop
£460KLM
Find Deal
Thu, 4 Sep - Sun, 14 Sep
United Airlines Logo
13:15 - 09:40ONT-LHR
12h 25m1 stop
United Airlines Logo
11:25 - 17:23LHR-ONT
13h 58m1 stop
£475United Airlines
Find Deal
Mon, 29 Sep - Wed, 15 Oct

Delta flights from Ontario to London Heathrow Airport

Our best Delta deals on Ontario to London Heathrow Airport flight tickets
Delta
25 Aug
ONT11:45Ontario
15h 25m
1 stop
LHR11:10London Heathrow
10 Sept
LHR09:20London Heathrow
17h 51m
1 stop
ONT19:11Ontario
£385
Find similar
Delta
30 Dec
ONT06:45Ontario
22h 05m
1 stop
LHR12:50London Heathrow
9 Jan
LHR08:55London Heathrow
20h 19m
2 stops
ONT21:14Ontario
£386
Find similar
Delta
1 Oct
ONT11:50Ontario
18h 25m
1 stop
LHR14:15London Heathrow
8 Oct
LHR11:30London Heathrow
19h 11m
2 stops
ONT22:41Ontario
£386
Find similar

Virgin Atlantic flights from Ontario to London Heathrow Airport

Our best Virgin Atlantic deals on Ontario to London Heathrow Airport flight tickets
Virgin Atlantic
1 Oct
ONT06:00Ontario
21h 20m
1 stop
LHR11:20London Heathrow
8 Oct
LHR11:00London Heathrow
20h 39m
1 stop
ONT23:39Ontario
£392
Find similar
Virgin Atlantic
25 Aug
ONT09:50Ontario
16h 00m
1 stop
LHR09:50London Heathrow
9 Sept
LHR13:25London Heathrow
17h 17m
1 stop
ONT22:42Ontario
£400
Find similar
Virgin Atlantic
31 Oct
ONT07:05Ontario
18h 55m
1 stop
LHR09:00London Heathrow
4 Nov
LHR06:20London Heathrow
24h 21m
2 stops
ONT22:41Ontario
£423
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 17 August 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 30/12

06:45-12:50

1 stop22h 05m

London Heathrow

Fri 9/1

08:55-21:14

2 stops20h 19m

£386

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/10

11:50-14:15

1 stop18h 25m

London Heathrow

Wed 8/10

11:30-22:41

2 stops19h 11m

£386

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/10

11:55-11:25

2 stops15h 30m

London Heathrow

Wed 8/10

11:30-22:41

2 stops19h 11m

£389

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/10

06:00-11:20

1 stop21h 20m

London Heathrow

Wed 8/10

11:00-23:39

1 stop20h 39m

£392

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 31/10

07:05-09:00

1 stop18h 55m

London Heathrow

Tue 4/11

06:20-22:41

2 stops24h 21m

£423

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 6/10

13:15-09:40

1 stop12h 25m

London Heathrow

Wed 22/10

14:50-20:24

1 stop13h 34m

£448

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 23/12

11:56-09:00

1 stop13h 04m

London Heathrow

Sat 10/1

10:45-16:19

1 stop13h 34m

£458

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 9/1

06:00-06:50

2 stops16h 50m

London Heathrow

Sun 18/1

12:20-22:38

1 stop18h 18m

£459

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 4/9

11:40-14:15

1 stop18h 35m

London Heathrow

Sun 14/9

09:20-22:23

1 stop21h 03m

£460

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 29/9

13:15-09:40

1 stop12h 25m

London Heathrow

Wed 15/10

11:25-17:23

1 stop13h 58m

£475

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 typical price of a round-trip flight between Ontario and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

In general, October 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 £499. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Ontario averaging around £507.

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 £522. 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 £597.

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 £685 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 £627 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 £497 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

Best price found

£290

Fastest flight time

12h 06m

Direct flights

None
The best one-way flight to London Heathrow Airport from Ontario in the past 72 hours is £290. The best return flight deal from Ontario to London Heathrow Airport found on momondo in the last 72 hours is £386.
The fastest flight from Ontario to London Heathrow Airport takes 12h 06m
There are no direct flights from Ontario to London Heathrow Airport. Popular non-direct route for this connection is Ontario Airport - 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 25m.

  • 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?

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Stratford-upon-Avon
Ipswich
Ilford
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Colchester
Swanage
Worthing
Hounslow
Dartford
Dover

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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