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 £519. Other airlines that can offer you cheap pricing are Virgin Atlantic, from £528, and British Airways, from £532. Iberia is currently priced 21% 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 WestJet. According to our data, you can fly for as low as £303. Users have also found prices from £332 and £340 on Iberia and British Airways, respectively.

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

To save up to 16% 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 £601 1-2 weeks out and tickets from £805 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 £609. Cheapflights users have found deals in the month of October for as cheap as £361. 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.

£270+ Flights from Ontario to London Heathrow Airport

Cheap flight deals from Ontario to Heathrow

Round-trip from	£519
One-way from	£270
Popular in	July
Cheapest in	April
Average price	£584

Iberia
9/2-20/2
3 total stops
39h 04m total
Ontario to London

Search Deals

2/2
2 total stops
31h 51m total
Ontario to London

Search Deals

High demand for flights, 24% potential price rise

Search Deals

Best time to find cheap flights, 4% potential price drop

Search Deals

Average for round-trip flights in January 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 17 January 2025.

Sun 9/210:49ONT - LHR

1 stop17h 16mIberia

Thu 20/210:05LHR - ONT

2 stops21h 48mIberia

Deal found 16/1£519

Sun 26/113:00ONT - LHR

1 stop13h 35mKLM

Tue 11/212:30LHR - ONT

1 stop18h 22mKLM

Deal found 16/1£521

Mon 3/213:00ONT - LHR

1 stop14h 40mVirgin Atlantic

Tue 11/210:45LHR - ONT

1 stop21h 06mVirgin Atlantic

Deal found 16/1£528

Tue 28/106:00ONT - LHR

1 stop17h 20mBritish Airways

Wed 5/206:15LHR - ONT

2 stops24h 30mBritish Airways

Deal found 16/1£532

Sun 9/207:05ONT - LHR

2 stops16h 50mDelta

Thu 20/206:30LHR - ONT

2 stops24h 22mDelta

Deal found 16/1£541

Tue 25/206:00ONT - LHR

2 stops19h 40mUnited Airlines

Wed 5/309:30LHR - ONT

2 stops19h 10mUnited Airlines

Deal found 16/1£561

Sat 8/213:45ONT - LHR

2 stops33h 25mAir Canada

Thu 20/218:00LHR - ONT

2 stops34h 52mAir Canada

Deal found 16/1£563

Wed 5/1110:40ONT - LHR

2 stops15h 30mMultiple Airlines

Tue 11/1111:10LHR - ONT

2 stops17h 07mMultiple Airlines

Deal found 15/1£596

Fri 18/413:35ONT - LHR

1 stop12h 05mLufthansa

Fri 2/510:35LHR - ONT

1 stop15h 26mLufthansa

Deal found 16/1£607

Thu 28/822:40ONT - LHR

1 stop14h 05mJetBlue

Sat 13/907:25LHR - ONT

1 stop22h 57mJetBlue

Deal found 16/1£787

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 17 January 2025.

Sun 9/210:49ONT - LHR

1 stop17h 16mIberia

Thu 20/210:05LHR - ONT

2 stops21h 48mIberia

Deal found 16/1£519

Mon 3/213:00ONT - LHR

1 stop14h 40mVirgin Atlantic

Tue 11/210:45LHR - ONT

1 stop21h 06mVirgin Atlantic

Deal found 16/1£528

Tue 28/106:00ONT - LHR

1 stop17h 20mBritish Airways

Wed 5/206:15LHR - ONT

2 stops24h 30mBritish Airways

Deal found 16/1£532

Sun 9/213:00ONT - LHR

1 stop13h 35mKLM

Fri 21/215:50LHR - ONT

1 stop14h 42mKLM

Deal found 17/1£541

Tue 4/213:21ONT - LHR

1 stop12h 39mDelta

Wed 12/210:45LHR - ONT

1 stop13h 43mDelta

Deal found 16/1£542

Tue 25/206:00ONT - LHR

2 stops19h 40mUnited Airlines

Tue 4/309:30LHR - ONT

2 stops19h 10mUnited Airlines

Deal found 16/1£561

Sun 9/205:10ONT - LHR

2 stops18h 00mAir Canada

Wed 19/213:00LHR - ONT

2 stops28h 15mAir Canada

Deal found 17/1£565

Fri 31/105:10ONT - LHR

2 stops19h 20mMultiple Airlines

Fri 7/214:30LHR - ONT

2 stops30h 13mMultiple Airlines

Deal found 17/1£605

Fri 18/413:35ONT - LHR

1 stop12h 05mLufthansa

Fri 2/510:35LHR - ONT

1 stop15h 26mLufthansa

Deal found 16/1£607

Last-minute flights from Ontario to Heathrow
Discover last-minute flight deals from Ontario to Heathrow. Data last updated 17 January 2025 and is based on user searches.

Thu 16/114:44ONT - LHR

1 stop13h 21mAmerican Airlines

Mon 20/110:40LHR - ONT

1 stop15h 57mAmerican Airlines

Deal found 16/1£929

Fri 17/106:00ONT - LHR

2 stops22h 50mWestJet

Thu 23/114:50LHR - ONT

2 stops56h 35mWestJet

Deal found 16/1£4,983

Wed 22/113:21ONT - LHR

1 stop12h 39mDelta

Wed 29/110:45LHR - ONT

1 stop13h 43mDelta

Deal found 16/1£804

Thu 23/114:44ONT - LHR

1 stop13h 21mIberia

Thu 30/113:50LHR - ONT

1 stop16h 26mIberia

Deal found 16/1£562

Thu 23/114:44ONT - LHR

1 stop13h 21mMultiple Airlines

Wed 29/121:40LHR - ONT

2 stops31h 20mMultiple Airlines

Deal found 16/1£1,158

Fri 24/110:56ONT - LHR

1 stop13h 19mBritish Airways

Sat 12/408:20LHR - ONT

1 stop15h 47mBritish Airways

Deal found 16/1£818

Sat 25/106:15ONT - LHR

1 stop17h 10mUnited Airlines

Tue 28/109:30LHR - ONT

2 stops20h 27mUnited Airlines

Deal found 16/1£923

Sun 26/113:00ONT - LHR

1 stop13h 35mKLM

Tue 11/212:30LHR - ONT

1 stop18h 22mKLM

Deal found 16/1£521

Sun 26/105:10ONT - LHR

2 stops18h 00mAir Canada

Tue 4/213:00LHR - ONT

2 stops28h 51mAir Canada

Deal found 16/1£566

Tue 28/106:00ONT - LHR

1 stop17h 20mBritish Airways

Wed 5/206:15LHR - ONT

2 stops24h 30mBritish Airways

Deal found 16/1£532

Fri 31/106:15ONT - LHR

1 stop17h 10mLufthansa

Wed 30/414:50LHR - ONT

1 stop13h 52mLufthansa

Deal found 16/1£1,127

Mon 3/213:00ONT - LHR

1 stop14h 40mVirgin Atlantic

Tue 11/210:45LHR - ONT

1 stop21h 06mVirgin Atlantic

Deal found 16/1£528

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 17 January 2025.

Sun 2/220:59ONT - LHR

2 stops31h 51mMultiple Airlines

Deal found 17/1£270

Wed 19/206:00ONT - LHR

2 stops22h 50mWestJet

Deal found 16/1£303

Sun 2/214:44ONT - LHR

1 stop13h 21mIberia

Deal found 17/1£332

Sun 9/216:25ONT - LHR

1 stop12h 55mBritish Airways

Deal found 17/1£340

Mon 10/213:00ONT - LHR

1 stop13h 35mKLM

Deal found 17/1£342

Sun 23/306:00ONT - LHR

1 stop21h 50mUnited Airlines

Deal found 17/1£346

Sat 22/213:05ONT - LHR

1 stop33h 15mVirgin Atlantic

Deal found 16/1£348

Sat 8/205:10ONT - LHR

2 stops17h 20mAir Canada

Deal found 17/1£388

Sat 12/722:40ONT - LHR

1 stop14h 05mJetBlue

Deal found 16/1£440

Thu 10/407:00ONT - LHR

1 stop15h 25mDelta

Deal found 16/1£485

Tue 17/623:25ONT - LHR

2 stops32h 10mAvianca

Deal found 16/1£629

Mon 31/300:10ONT - LHR

1 stop32h 20mChina Airlines

Deal found 17/1£3,966

Find flights from Ontario to Heathrow within your budget

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 9/2

10:49-12:05

1 stop17h 16m

London Heathrow

Thu 20/2

10:05-23:53

2 stops21h 48m

£519

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 3/2

13:00-11:40

1 stop14h 40m

London Heathrow

Tue 11/2

10:45-23:51

1 stop21h 06m

£528

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 28/1

06:00-07:20

1 stop17h 20m

London Heathrow

Wed 5/2

06:15-22:45

2 stops24h 30m

£532

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 9/2

13:00-10:35

1 stop13h 35m

London Heathrow

Fri 21/2

15:50-22:32

1 stop14h 42m

£541

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 4/2

13:21-10:00

1 stop12h 39m

London Heathrow

Wed 12/2

10:45-16:28

1 stop13h 43m

£542

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 25/2

06:00-09:40

2 stops19h 40m

London Heathrow

Tue 4/3

09:30-20:40

2 stops19h 10m

£561

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 9/2

05:10-07:10

2 stops18h 00m

London Heathrow

Wed 19/2

13:00-09:15

2 stops28h 15m

£565

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 31/1

05:10-08:30

2 stops19h 20m

London Heathrow

Fri 7/2

14:30-12:43

2 stops30h 13m

£605

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 18/4

13:35-09:40

1 stop12h 05m

London Heathrow

Fri 2/5

10:35-18:01

1 stop15h 26m

£607

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 2/2

20:59-12:50

2 stops31h 51m

£270

Flights are sorted by cheapest return flights first.

Deals found on 17/1

Showing 1-10 of 21 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 £161). 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 British Airways 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.

China Airlines

8.2

Very Good

737 reviews

Check prices

Reviews

1 / 10

For the money it’s good value. Seat space rather small

China Airlines

8.2

Very Good

737 reviews

China Airlines

8.2

Very Good

737 reviews

Check prices

Reviews

1 / 10

For the money it’s good value. Seat space rather small

Delta

8.0

Very Good

8,513 reviews

China Airlines

8.2

Very Good

737 reviews

Check prices

Reviews

1 / 10

For the money it’s good value. Seat space rather small

KLM

7.8

Good

1,339 reviews

China Airlines

8.2

Very Good

737 reviews

Check prices

Reviews

1 / 10

For the money it’s good value. Seat space rather small

Virgin Atlantic

7.5

Good

664 reviews

China Airlines

8.2

Very Good

737 reviews

Check prices

Reviews

1 / 10

For the money it’s good value. Seat space rather small

JetBlue

7.4

Good

3,199 reviews

China Airlines

8.2

Very Good

737 reviews

Check prices

Reviews

1 / 10

For the money it’s good value. Seat space rather small

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 £519. Other airlines that can offer you cheap pricing are Virgin Atlantic, from £528, and British Airways, from £532. Iberia is currently priced 21% 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 WestJet. According to our data, you can fly for as low as £303. Users have also found prices from £332 and £340 on Iberia and British Airways, 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 £161). 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

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Croydon

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Ilford

Hayes

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Northampton

Swindon

Maidstone

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Wembley

Ipswich

Watford

Crawley

Southall

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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 £270

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 2/2. 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 17 January 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 17 January 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 10 January 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 17 January 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 British Airways 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 17 January 2025.