Which airport typically offers the quickest stopover for flights from Ontario to London Heathrow Airport?

Flights via San Francisco (SFO) offer the fastest connection on this route, with an average stopover time of 2h 32m.

What’s the top stopover airport for flights from Ontario to London Heathrow Airport?

Dallas (DFW) – chosen by Cheapflights users on 50% of one-stop itineraries from Ontario to London Heathrow Airport on Cheapflights.

What’s the cheapest stopover airport for flights from Ontario to London Heathrow Airport?

San Francisco (SFO) is the most affordable one-stop option, with an average return flight price of £679.

What’s the fastest stopover option from Ontario to London Heathrow Airport?

Flights via San Francisco (SFO) have the shortest average one-way travel time for one-stop routes: 13h 49m.

How long is the flight from Ontario to London Heathrow Airport?

Delta can get you from Ontario to London Heathrow Airport in just under 18h 21m. Your travel time can differ by up to . The distance between Ontario and London Heathrow Airport is about 5407 mi.

What are the cheapest airlines to fly from Ontario to London Heathrow Airport one-way?

For one-way options, check prices for Air Canada. According to our data, you can fly for as low as £294. Users have also found prices from £300 and £303 on British Airways and KLM, respectively.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What airport do you fly from for flights from Ontario to London Heathrow?

Most people fly from Ontario (ONT) if they book a flight from Ontario to London Heathrow. On average, Ontario has 0 outbound flights to London Heathrow per day from 0 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

Can I find deals for flights from Ontario to Heathrow that include hotel bookings?

Yes. In addition to deals on Ontario to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Ontario to Heathrow?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Heathrow.

Can I find deals for business class flights from Ontario to Heathrow?

Yes. Cheapflights offers flight deals from Ontario to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£292+ Cheap Flights from Ontario to London Heathrow Airport

Q: How much does it cost for a return flight from Ontario to London Heathrow Airport?

Airfare is below average for this route at the moment. Ontario to London Heathrow Airport flights typically cost between £499 and £688 in December. The cheapest return flight price found within the last 3 days was £443 on Virgin Atlantic (2 Dec-16 Dec).

Find flight deals from Ontario to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Heathrow
Explore the most affordable flight options available from Ontario to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 10월 2025.

화 2/1206:00ONT - LHR

1 stop20h 00mVirgin Atlantic

화 16/1210:45LHR - ONT

1 stop21h 13mVirgin Atlantic

Deal found 14/10£443

일 19/1016:49ONT - LHR

1 stop12h 01mBritish Airways

화 4/1115:00LHR - ONT

1 stop15h 29mBritish Airways

Deal found 13/10£462

월 13/1016:49ONT - LHR

1 stop12h 01mBritish Airways

화 28/1015:00LHR - ONT

1 stop14h 42mBritish Airways

Deal found 13/10£466

월 13/1016:49ONT - LHR

1 stop12h 01mAmerican Airlines

화 28/1015:00LHR - ONT

1 stop14h 42mAmerican Airlines

Deal found 12/10£467

화 2/1213:20ONT - LHR

1 stop12h 40mDelta

화 16/1208:40LHR - ONT

2 stops22h 24mDelta

Deal found 13/10£467

수 22/1007:05ONT - LHR

1 stop22h 25mVirgin Atlantic

화 4/1106:30LHR - ONT

2 stops24h 11mVirgin Atlantic

Deal found 13/10£468

화 21/1016:49ONT - LHR

1 stop12h 01mBritish Airways

화 28/1015:00LHR - ONT

1 stop14h 42mBritish Airways

Deal found 13/10£472

수 31/1206:38ONT - LHR

1 stop19h 52mDelta

목 29/114:45LHR - ONT

1 stop15h 53mDelta

Deal found 14/10£473

Best flights from Ontario to Heathrow
Discover carefully curated flight deals from Ontario to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 10월 2025.

화 18/1117:49ONT - LHR

2 stops18h 21mDelta

월 24/1111:45LHR - ONT

2 stops44h 07mDelta

Deal found 14/10£471

화 18/1112:16ONT - LHR

1 stop15h 24mKLM

일 23/1108:55LHR - ONT

1 stop18h 47mKLM

Deal found 14/10£510

월 27/1013:40ONT - LHR

1 stop15h 20mUnited Airlines

화 4/1110:05LHR - ONT

1 stop15h 29mUnited Airlines

Deal found 14/10£510

금 27/206:00ONT - LHR

1 stop20h 00mVirgin Atlantic

화 3/311:45LHR - ONT

2 stops42h 53mVirgin Atlantic

Deal found 14/10£511

화 30/1207:05ONT - LHR

1 stop16h 45mDelta

목 29/110:45LHR - ONT

1 stop18h 29mDelta

Deal found 13/10£473

화 4/1113:33ONT - LHR

1 stop12h 07mUnited Airlines

화 11/1110:05LHR - ONT

1 stop15h 29mUnited Airlines

Deal found 14/10£510

수 31/1206:38ONT - LHR

1 stop19h 52mDelta

화 3/214:45LHR - ONT

1 stop15h 53mDelta

Deal found 13/10£473

화 30/1207:05ONT - LHR

1 stop16h 45mDelta

수 28/112:30LHR - ONT

1 stop16h 44mDelta

Deal found 13/10£473

월 29/1222:29ONT - LHR

1 stop23h 56mDelta

금 23/110:45LHR - ONT

1 stop18h 29mDelta

Deal found 13/10£473

월 29/1222:29ONT - LHR

1 stop23h 56mDelta

금 30/112:30LHR - ONT

1 stop16h 44mDelta

Deal found 13/10£473

수 31/1213:15ONT - LHR

1 stop12h 45mDelta

목 29/110:45LHR - ONT

1 stop13h 34mDelta

Deal found 13/10£473

일 18/113:00ONT - LHR

1 stop14h 40mDelta

목 26/314:45LHR - ONT

1 stop14h 53mDelta

Deal found 14/10£497

Last-minute flights from Ontario to Heathrow
Discover last-minute flight deals from Ontario to Heathrow. Data last updated 15 10월 2025 and is based on user searches.

일 19/1016:49ONT - LHR

1 stop12h 01mBritish Airways

화 4/1115:00LHR - ONT

1 stop15h 29mBritish Airways

Deal found 13/10£462

월 20/1013:15ONT - LHR

1 stop12h 35mDelta

수 5/1110:45LHR - ONT

1 stop16h 34mDelta

Deal found 13/10£473

화 21/1016:49ONT - LHR

1 stop12h 01mBritish Airways

화 28/1015:00LHR - ONT

1 stop14h 42mBritish Airways

Deal found 13/10£472

수 22/1008:15ONT - LHR

1 stop14h 10mBritish Airways

화 4/1110:05LHR - ONT

1 stop16h 16mBritish Airways

Deal found 13/10£467

수 22/1007:05ONT - LHR

1 stop22h 25mVirgin Atlantic

화 4/1106:30LHR - ONT

2 stops24h 11mVirgin Atlantic

Deal found 13/10£468

수 5/1112:46ONT - LHR

1 stop13h 14mBritish Airways

화 11/1108:20LHR - ONT

1 stop18h 01mBritish Airways

Deal found 14/10£467

수 5/1113:15ONT - LHR

1 stop12h 45mVirgin Atlantic

화 11/1112:20LHR - ONT

2 stops19h 32mVirgin Atlantic

Deal found 14/10£479

월 10/1106:45ONT - LHR

1 stop19h 45mVirgin Atlantic

일 23/1110:45LHR - ONT

1 stop21h 07mVirgin Atlantic

Deal found 14/10£481

One-way flights from Ontario to Heathrow
Search for one-way flight options from Ontario to Heathrow. Find affordable one-way fares based on user searches. Data last updated 15 10월 2025.

월 2/305:40ONT - LHR

2 stops17h 30mAir Canada

Deal found 14/10£292

일 11/105:05ONT - LHR

2 stops18h 05mAir Canada

Deal found 14/10£294

수 31/1205:05ONT - LHR

2 stops18h 05mAir Canada

Deal found 13/10£295

일 11/115:09ONT - LHR

1 stop13h 06mBritish Airways

Deal found 14/10£295

월 29/1205:05ONT - LHR

2 stops41h 25mAir Canada

Deal found 13/10£297

일 9/1116:47ONT - LHR

1 stop12h 28mBritish Airways

Deal found 14/10£298

화 30/1205:05ONT - LHR

2 stops41h 25mAir Canada

Deal found 14/10£299

수 29/1012:47ONT - LHR

1 stop12h 48mBritish Airways

Deal found 13/10£300

수 19/1113:20ONT - LHR

1 stop12h 40mVirgin Atlantic

Deal found 13/10£301

월 30/313:00ONT - LHR

1 stop12h 50mKLM

Deal found 14/10£303

일 29/305:00ONT - LHR

2 stops17h 35mAir Canada

Deal found 14/10£307

일 2/1118:38ONT - LHR

1 stop33h 22mUnited Airlines

Deal found 14/10£312

Cheap flight deals from Ontario to Heathrow

Round-trip from	£443
One-way from	£292
Popular in	June
Cheapest in	March
Average price	£640

Virgin Atlantic
2/12-16/12
2 total stops
41h 13m total
Ontario to London

Search Deals

Air Canada
2/3
2 total stops
17h 30m total
Ontario to London

Search Deals

Highest demand for flights based on searches. 22% potential increase in price (£141 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£24 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 2025

Search Deals

Cheapflights Fare Finder

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

화 18/11

17:49-20:10

2 stops18h 21m

London Heathrow

월 24/11

11:45-23:52

2 stops44h 07m

£471

OntarioLondon

ONT - LHR

ONTLHR

Ontario

화 30/12

07:05-07:50

1 stop16h 45m

London Heathrow

목 29/1

10:45-21:14

1 stop18h 29m

£473

OntarioLondon

ONT - LHR

ONTLHR

Ontario

수 31/12

06:38-10:30

1 stop19h 52m

London Heathrow

화 3/2

14:45-22:38

1 stop15h 53m

£473

OntarioLondon

ONT - LHR

ONTLHR

Ontario

화 30/12

07:05-07:50

1 stop16h 45m

London Heathrow

수 28/1

12:30-21:14

1 stop16h 44m

£473

OntarioLondon

ONT - LHR

ONTLHR

Ontario

월 29/12

22:29-06:25

1 stop23h 56m

London Heathrow

금 23/1

10:45-21:14

1 stop18h 29m

£473

OntarioLondon

ONT - LHR

ONTLHR

Ontario

월 29/12

22:29-06:25

1 stop23h 56m

London Heathrow

금 30/1

12:30-21:14

1 stop16h 44m

£473

OntarioLondon

ONT - LHR

ONTLHR

Ontario

수 31/12

13:15-10:00

1 stop12h 45m

London Heathrow

목 29/1

10:45-16:19

1 stop13h 34m

£473

OntarioLondon

ONT - LHR

ONTLHR

Ontario

일 18/1

13:00-11:40

1 stop14h 40m

London Heathrow

목 26/3

14:45-22:38

1 stop14h 53m

£497

OntarioLondon

ONT - LHR

ONTLHR

Ontario

화 18/11

12:16-11:40

1 stop15h 24m

London Heathrow

일 23/11

08:55-19:42

1 stop18h 47m

£510

OntarioLondon

ONT - LHR

ONTLHR

Ontario

월 27/10

13:40-12:00

1 stop15h 20m

London Heathrow

화 4/11

10:05-17:34

1 stop15h 29m

£510

Flights are sorted by cheapest return flights first.

Deals found on 14/10

Showing 1-10 of 22 results

Best time to book a flight from Ontario to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Ontario with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to London Heathrow Airport

Prices

How far ahead should I book a flight from Ontario to London Heathrow Airport?

To ensure you get the cheapest price possible for a flight from Ontario to London Heathrow Airport, you should look to book at least 62 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Ontario to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of £328). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of £525). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to LHR?

Unlike at midday, when flights are generally more expensive, you can save up to 5% on flights from Ontario to London Heathrow Airport by exploring options for tickets in the afternoon.

How much does it cost for a return flight from Ontario to London Heathrow Airport?

Related info for your journey

What airport do you fly from for flights from Ontario to London Heathrow?
Most people fly from Ontario (ONT) if they book a flight from Ontario to London Heathrow. On average, Ontario has 0 outbound flights to London Heathrow per day from 0 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.
How long is the flight from Ontario to London Heathrow Airport?
Delta can get you from Ontario to London Heathrow Airport in just under 18h 21m. Your travel time can differ by up to . The distance between Ontario and London Heathrow Airport is about 5407 mi.
What are the cheapest airlines to fly from Ontario to London Heathrow Airport one-way?
For one-way options, check prices for Air Canada. According to our data, you can fly for as low as £294. Users have also found prices from £300 and £303 on British Airways and KLM, respectively.
Can I find deals for flights from Ontario to Heathrow that include hotel bookings?
Yes. In addition to deals on Ontario to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Ontario to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Heathrow.
Can I find deals for business class flights from Ontario to Heathrow?
Yes. Cheapflights offers flight deals from Ontario to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Ontario to London Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of £328). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of £525). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Milton Keynes

Croydon

Slough

Gatwick

Hounslow

Northampton

Luton

Wembley

Deal

Ilford

Crawley

Hayes

Watford

Winchester

Swindon

Chichester

Romford

Ipswich

Brentford

Dartford

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How does Cheapflights help users find flights from Ontario to Heathrow?

When you search for this flight from Ontario to Heathrow, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Heathrow?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Ontario to Heathrow.

Can Cheapflights find flights from Ontario to Heathrow with no change fees?

Certainly. Search results for flights to Heathrow from Ontario shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Ontario to Heathrow become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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Cheap flights from Ontario to London Heathrow Airport from £292

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/3. Fares are subject to change and may not be available on all flights or dates of travel.

Find flight deals from Ontario to Heathrow

Cheapest flights from Ontario to HeathrowExplore the most affordable flight options available from Ontario to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 10월 2025.

Explore the most affordable flight options available from Ontario to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 10월 2025.

Cheap flight deals from Ontario to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to London Heathrow Airport that are best for you.

Best time to book a flight from Ontario to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to London Heathrow Airport

How far ahead should I book a flight from Ontario to London Heathrow Airport?

What is the cheapest month to book a flight from Ontario to London Heathrow Airport?

What is the cheapest time of day to fly from ONT to LHR?

How much does it cost for a return flight from Ontario to London Heathrow Airport?

What’s the top stopover airport for flights from Ontario to London Heathrow Airport?

What’s the fastest stopover option from Ontario to London Heathrow Airport?

What’s the fastest stopover option from Ontario to London Heathrow Airport?

Which airport typically offers the quickest stopover for flights from Ontario to London Heathrow Airport?

Related info for your journey

Find useful and relevant information for your journey from Ontario to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Ontario to London Heathrow?

How long is the flight from Ontario to London Heathrow Airport?

What are the cheapest airlines to fly from Ontario to London Heathrow Airport one-way?

Can I find deals for flights from Ontario to Heathrow that include hotel bookings?

How can I find direct flights from Ontario to Heathrow?

Can I find deals for business class flights from Ontario to Heathrow?

What is the cheapest month to book a flight from Ontario to London Heathrow Airport?

Travelling to a place near London Heathrow Airport?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ontario to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

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Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to Heathrow?

Why should you use Cheapflights to find cheap flight tickets from Ontario to Heathrow?

Can Cheapflights find flights from Ontario to Heathrow with no change fees?

Can Cheapflights notify me if prices for flights from Ontario to Heathrow become cheaper?

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Cheapest flights from Ontario to Heathrow
Explore the most affordable flight options available from Ontario to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 10월 2025.