What are the cheapest airlines flying from Ontario to London Heathrow Airport round-trip?

Cheapflights users have booked flights from Ontario to London Heathrow Airport round-trip from £482. Other airlines that can offer you cheap pricing are Virgin Atlantic, from £492, and Delta, from £508. Iberia is currently priced 25% below the average price you’ll pay for this route.

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

For one-way options, check prices for JetBlue. According to our data, you can fly for as low as £296. Users have also found prices from £322 and £326 on WestJet and KLM, respectively.

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

To save up to 15% on this flight, we recommend booking at least 56 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ontario to London Heathrow Airport from £572 1-2 weeks out and tickets from £776 for flights departing within the next 72 hours.

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

October can be a great time to fly to London Heathrow Airport from Ontario with a flight ticket averaging about £592. Cheapflights users have found deals in the month of October for as cheap as £349. The most expensive prices can be found in the month of June.

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.

£296+ Flights from Ontario to London Heathrow Airport

Cheap flight deals from Ontario to Heathrow

Round-trip from	£482
One-way from	£296
Popular in	June
Cheapest in	April
Average price	£542

Iberia
26/3-9/4
2 total stops
28h 48m total
Ontario to London

Search Deals

JetBlue
30/4
1 total stop
14h 05m total
Ontario to London

Search Deals

Highest demand for flights based on searches. 23% potential increase in price (£152 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£22 potential savings vs. average return price).

Search Deals

Average for round-trip flights in February 2025

Search Deals

Find flight deals from Ontario to Heathrow

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 21 February 2025.

Wed 26/310:57ONT - LHR

1 stop13h 23mIberia

Wed 9/416:25LHR - ONT

1 stop15h 25mIberia

Deal found 21/2£482

Wed 26/311:42ONT - LHR

1 stop16h 28mVirgin Atlantic

Wed 9/411:45LHR - ONT

2 stops20h 07mVirgin Atlantic

Deal found 21/2£492

Sun 23/310:57ONT - LHR

1 stop15h 43mMultiple Airlines

Wed 2/415:40LHR - ONT

1 stop14h 20mMultiple Airlines

Deal found 20/2£506

Thu 27/307:00ONT - LHR

1 stop16h 20mDelta

Thu 10/406:30LHR - ONT

2 stops18h 13mDelta

Deal found 19/2£508

Mon 10/313:30ONT - LHR

1 stop13h 30mKLM

Tue 18/312:30LHR - ONT

1 stop17h 13mKLM

Deal found 20/2£512

Thu 13/306:00ONT - LHR

2 stops18h 10mUnited Airlines

Thu 27/315:00LHR - ONT

2 stops36h 57mUnited Airlines

Deal found 20/2£517

Sat 15/323:59ONT - LHR

2 stops33h 01mBritish Airways

Thu 10/416:25LHR - ONT

1 stop15h 25mBritish Airways

Deal found 20/2£530

Sat 15/318:45ONT - LHR

1 stop29h 40mLufthansa

Thu 10/416:15LHR - ONT

1 stop14h 40mLufthansa

Deal found 20/2£531

Wed 2/413:20ONT - LHR

2 stops16h 00mAir Canada

Wed 9/410:15LHR - ONT

2 stops18h 06mAir Canada

Deal found 21/2£532

Thu 1/522:40ONT - LHR

1 stop14h 05mJetBlue

Tue 6/511:55LHR - ONT

1 stop17h 27mJetBlue

Deal found 20/2£597

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 21 February 2025.

Wed 26/310:57ONT - LHR

1 stop13h 23mIberia

Wed 9/416:25LHR - ONT

1 stop15h 25mIberia

Deal found 21/2£482

Wed 26/311:42ONT - LHR

1 stop16h 28mVirgin Atlantic

Wed 9/411:45LHR - ONT

2 stops20h 07mVirgin Atlantic

Deal found 21/2£492

Sun 23/310:57ONT - LHR

1 stop15h 43mMultiple Airlines

Wed 2/415:40LHR - ONT

1 stop14h 20mMultiple Airlines

Deal found 20/2£506

Thu 27/307:00ONT - LHR

1 stop16h 20mDelta

Thu 10/406:30LHR - ONT

2 stops18h 13mDelta

Deal found 19/2£508

Mon 10/313:30ONT - LHR

1 stop13h 30mKLM

Tue 18/312:30LHR - ONT

1 stop17h 13mKLM

Deal found 20/2£512

Thu 13/306:00ONT - LHR

2 stops18h 10mUnited Airlines

Thu 27/315:00LHR - ONT

2 stops36h 57mUnited Airlines

Deal found 20/2£517

Sat 15/323:59ONT - LHR

2 stops33h 01mBritish Airways

Thu 10/416:25LHR - ONT

1 stop15h 25mBritish Airways

Deal found 20/2£530

Sat 15/318:45ONT - LHR

1 stop29h 40mLufthansa

Thu 10/416:15LHR - ONT

1 stop14h 40mLufthansa

Deal found 20/2£531

Wed 2/413:20ONT - LHR

2 stops16h 00mAir Canada

Wed 9/410:15LHR - ONT

2 stops18h 06mAir Canada

Deal found 21/2£532

Thu 1/522:40ONT - LHR

1 stop14h 05mJetBlue

Tue 6/511:55LHR - ONT

1 stop17h 27mJetBlue

Deal found 20/2£597

Last-minute flights from Ontario to Heathrow
Discover last-minute flight deals from Ontario to Heathrow. Data last updated 21 February 2025 and is based on user searches.

Wed 26/213:05ONT - LHR

1 stop13h 30mKLM

Thu 27/312:30LHR - ONT

1 stop17h 13mKLM

Deal found 20/2£772

Wed 26/206:00ONT - LHR

2 stops22h 50mWestJet

Tue 11/314:50LHR - ONT

2 stops56h 52mWestJet

Deal found 20/2£4,832

Thu 27/213:00ONT - LHR

1 stop15h 00mUnited Airlines

Thu 6/309:30LHR - ONT

2 stops21h 15mUnited Airlines

Deal found 20/2£801

Thu 27/222:30ONT - LHR

2 stops32h 05mAvianca

Mon 3/321:40LHR - ONT

2 stops31h 20mAvianca

Deal found 20/2£1,913

Sat 1/314:54ONT - LHR

1 stop13h 11mIberia

Sat 15/314:10LHR - ONT

1 stop15h 17mIberia

Deal found 21/2£5,355

Sun 2/306:05ONT - LHR

1 stop16h 15mBritish Airways

Wed 12/314:30LHR - ONT

1 stop14h 30mBritish Airways

Deal found 20/2£750

Sun 2/307:05ONT - LHR

1 stop15h 15mDelta

Wed 2/406:30LHR - ONT

2 stops18h 12mDelta

Deal found 20/2£763

Mon 3/314:54ONT - LHR

1 stop13h 11mMultiple Airlines

Mon 10/321:40LHR - ONT

2 stops31h 20mMultiple Airlines

Deal found 20/2£1,157

Mon 10/313:30ONT - LHR

1 stop13h 30mKLM

Tue 18/312:30LHR - ONT

1 stop17h 13mKLM

Deal found 20/2£512

Thu 13/306:00ONT - LHR

2 stops18h 10mUnited Airlines

Thu 27/315:00LHR - ONT

2 stops36h 57mUnited Airlines

Deal found 20/2£517

Sat 15/323:59ONT - LHR

2 stops33h 01mBritish Airways

Thu 10/416:25LHR - ONT

1 stop15h 25mBritish Airways

Deal found 20/2£530

Sat 15/318:45ONT - LHR

1 stop29h 40mLufthansa

Thu 10/416:15LHR - ONT

1 stop14h 40mLufthansa

Deal found 20/2£531

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 21 February 2025.

Wed 30/422:40ONT - LHR

1 stop14h 05mJetBlue

Deal found 21/2£296

Wed 26/311:42ONT - LHR

2 stops18h 08mWestJet

Deal found 20/2£322

Sun 16/312:46ONT - LHR

1 stop14h 49mKLM

Deal found 20/2£326

Tue 1/412:46ONT - LHR

1 stop14h 24mVirgin Atlantic

Deal found 20/2£328

Tue 18/310:57ONT - LHR

1 stop13h 23mBritish Airways

Deal found 20/2£329

Sun 4/506:00ONT - LHR

2 stops20h 00mAir Canada

Deal found 20/2£331

Sat 15/318:45ONT - LHR

1 stop34h 15mUnited Airlines

Deal found 20/2£345

Sun 3/800:59ONT - LHR

3 stops31h 46mMultiple Airlines

Deal found 21/2£360

Sat 29/312:46ONT - LHR

1 stop14h 24mAir France

Deal found 20/2£372

Fri 18/708:15ONT - LHR

1 stop14h 10mIberia

Deal found 19/2£477

Tue 27/523:25ONT - LHR

2 stops32h 10mAvianca

Deal found 20/2£658

Fri 23/510:00ONT - LHR

2 stops15h 10mAmerican Airlines

Deal found 21/2£669

Find flights from Ontario to Heathrow within your budget

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 26/3

10:57-07:20

1 stop13h 23m

London Heathrow

Wed 9/4

16:25-23:50

1 stop15h 25m

£482

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 26/3

11:42-11:10

1 stop16h 28m

London Heathrow

Wed 9/4

11:45-23:52

2 stops20h 07m

£492

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 23/3

10:57-09:40

1 stop15h 43m

London Heathrow

Wed 2/4

15:40-22:00

1 stop14h 20m

£506

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 27/3

07:00-06:20

1 stop16h 20m

London Heathrow

Thu 10/4

06:30-16:43

2 stops18h 13m

£508

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 10/3

13:30-10:00

1 stop13h 30m

London Heathrow

Tue 18/3

12:30-22:43

1 stop17h 13m

£512

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 13/3

06:00-07:10

2 stops18h 10m

London Heathrow

Thu 27/3

15:00-20:57

2 stops36h 57m

£517

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 15/3

23:59-16:00

2 stops33h 01m

London Heathrow

Thu 10/4

16:25-23:50

1 stop15h 25m

£530

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 15/3

18:45-07:25

1 stop29h 40m

London Heathrow

Thu 10/4

16:15-22:55

1 stop14h 40m

£531

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 2/4

13:20-13:20

2 stops16h 00m

London Heathrow

Wed 9/4

10:15-20:21

2 stops18h 06m

£532

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/5

22:40-20:45

1 stop14h 05m

London Heathrow

Tue 6/5

11:55-21:22

1 stop17h 27m

£597

Flights are sorted by cheapest return flights first.

Deals found on 21/2

Showing 1-10 of 23 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.

Travel insights for flights from Ontario to Heathrow

Get recent, data-driven insights about flights from Ontario to Heathrow including ideal travel times, pricing trends, and more.

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 42 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 £112). Flying from Ontario to London Heathrow Airport in August is currently the most expensive (average of £163). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to London Heathrow Airport as you normally would.

Rainfall in Heathrow by month

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.

Temperature in Heathrow by month

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).

Reviews of airlines servicing Heathrow

Read reviews from past customers who have flown Delta, KLM and Virgin Atlantic from Ontario to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

8,217 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very Good

8,217 reviews

Delta

8.0

Very Good

8,217 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,333 reviews

Delta

8.0

Very Good

8,217 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Virgin Atlantic

7.5

Good

654 reviews

Delta

8.0

Very Good

8,217 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air France

7.4

Good

1,449 reviews

Delta

8.0

Very Good

8,217 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines

7.4

Good

8,757 reviews

Delta

8.0

Very Good

8,217 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.
What are the cheapest airlines flying from Ontario to London Heathrow Airport round-trip?
Cheapflights users have booked flights from Ontario to London Heathrow Airport round-trip from £482. Other airlines that can offer you cheap pricing are Virgin Atlantic, from £492, and Delta, from £508. Iberia is currently priced 25% below the average price you’ll pay for this route.
What are the cheapest airlines to fly from Ontario to London Heathrow Airport one-way?
For one-way options, check prices for JetBlue. According to our data, you can fly for as low as £296. Users have also found prices from £322 and £326 on WestJet 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 £112). Flying from Ontario to London Heathrow Airport in August is currently the most expensive (average of £163). 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

Deal

Hounslow

Milton Keynes

Croydon

Gatwick

Slough

Luton

Ilford

Hayes

Eastbourne

Swindon

Northampton

Wembley

Southend-on-Sea

Ipswich

Winchester

Maidstone

Crawley

Southall

Watford

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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 £296

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 30/4. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Ontario to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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 21 February 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 21 February 2025.

Find flights from Ontario to Heathrow within your budget

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.

Travel insights for flights from Ontario to Heathrow

Get recent, data-driven insights about flights from Ontario to Heathrow including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a return flight from Ontario to Heathrow. Price data was last updated on 14 February 2025.

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?

Find hourly flight availability from Ontario to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 February 2025.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

Reviews of airlines servicing Heathrow

Read reviews from past customers who have flown Delta, KLM and Virgin Atlantic from Ontario to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

What are the cheapest airlines flying from Ontario to London Heathrow Airport round-trip?

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 Ontario?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Heathrow

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

Fly with Cheapflights

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 21 February 2025.