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 £474. Other airlines that can offer you cheap pricing are British Airways, from £494, and Virgin Atlantic, from £496. Iberia is currently priced 22% 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 £304. Users have also found prices from £320 and £324 on British Airways and KLM, respectively.

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

To save up to 9% 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 £554 1-2 weeks out and tickets from £739 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 £575. Cheapflights users have found deals in the month of October for as cheap as £339. 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.

£304+ Flights from Ontario to London Heathrow Airport

Cheap flight deals from Ontario to Heathrow

Round-trip from	£474
One-way from	£304
Popular in	June
Cheapest in	April
Average price	£511

Iberia
1/4-29/4
3 total stops
38h 03m total
Ontario to London

Search Deals

JetBlue
3/5
1 total stop
14h 05m total
Ontario to London

Search Deals

Highest demand for flights based on searches. 19% potential increase in price (£111 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).

Search Deals

Average for round-trip flights in March 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 March 2025.

Tue 8/410:54ONT - LHR

1 stop14h 06mIberia

Tue 22/412:00LHR - ONT

1 stop18h 10mIberia

Deal found 19/3£479

Tue 4/1117:01ONT - LHR

1 stop12h 19mBritish Airways

Tue 18/1110:40LHR - ONT

1 stop15h 09mBritish Airways

Deal found 20/3£484

Sun 6/407:00ONT - LHR

1 stop16h 15mVirgin Atlantic

Tue 22/413:25LHR - ONT

1 stop17h 18mVirgin Atlantic

Deal found 20/3£496

Mon 11/817:00ONT - LHR

1 stop11h 50mAmerican Airlines

Wed 27/811:15LHR - ONT

1 stop14h 33mAmerican Airlines

Deal found 20/3£516

Fri 2/518:48ONT - LHR

2 stops51h 42mUnited Airlines

Wed 14/507:30LHR - ONT

2 stops21h 04mUnited Airlines

Deal found 19/3£516

Sun 13/412:42ONT - LHR

1 stop14h 28mDelta

Thu 24/410:55LHR - ONT

1 stop13h 38mDelta

Deal found 21/3£523

Thu 1/514:35ONT - LHR

1 stop15h 40mKLM

Wed 7/511:00LHR - ONT

1 stop20h 42mKLM

Deal found 19/3£534

Fri 19/910:00ONT - LHR

2 stops17h 50mAir Canada

Mon 29/909:30LHR - ONT

2 stops21h 23mAir Canada

Deal found 19/3£579

Thu 11/1207:00ONT - LHR

2 stops15h 30mMultiple Airlines

Sat 31/111:10LHR - ONT

2 stops17h 07mMultiple Airlines

Deal found 20/3£591

Sat 3/522:40ONT - LHR

1 stop14h 05mJetBlue

Wed 14/508:15LHR - ONT

1 stop21h 07mJetBlue

Deal found 20/3£597

Wed 21/522:40ONT - LHR

1 stop14h 05mIcelandair

Wed 28/508:15LHR - ONT

1 stop21h 07mIcelandair

Deal found 20/3£731

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 March 2025.

Tue 1/410:57ONT - LHR

1 stop14h 03mIberia

Tue 29/406:10LHR - ONT

2 stops24h 00mIberia

Deal found 18/3£474

Sun 6/416:35ONT - LHR

1 stop12h 15mBritish Airways

Tue 22/415:40LHR - ONT

1 stop14h 18mBritish Airways

Deal found 20/3£494

Sun 6/407:00ONT - LHR

1 stop16h 15mVirgin Atlantic

Tue 22/413:25LHR - ONT

1 stop17h 18mVirgin Atlantic

Deal found 20/3£496

Sun 27/414:35ONT - LHR

1 stop15h 40mDelta

Thu 8/513:25LHR - ONT

1 stop17h 10mDelta

Deal found 18/3£503

Mon 11/817:00ONT - LHR

1 stop11h 50mAmerican Airlines

Wed 27/811:15LHR - ONT

1 stop14h 33mAmerican Airlines

Deal found 20/3£516

Fri 2/518:48ONT - LHR

2 stops51h 42mUnited Airlines

Wed 14/507:30LHR - ONT

2 stops21h 04mUnited Airlines

Deal found 19/3£516

Thu 1/514:35ONT - LHR

1 stop15h 40mKLM

Wed 7/511:00LHR - ONT

1 stop20h 42mKLM

Deal found 19/3£534

Thu 1/505:05ONT - LHR

2 stops44h 55mAir Canada

Wed 7/514:05LHR - ONT

2 stops30h 33mAir Canada

Deal found 19/3£536

Tue 13/513:10ONT - LHR

1 stop12h 40mAir France

Fri 7/1111:00LHR - ONT

1 stop14h 22mAir France

Deal found 19/3£569

Sat 3/522:40ONT - LHR

1 stop14h 05mJetBlue

Thu 8/508:15LHR - ONT

1 stop21h 07mJetBlue

Deal found 18/3£573

Fri 4/413:35ONT - LHR

1 stop12h 05mLufthansa

Sat 12/414:50LHR - ONT

1 stop13h 52mLufthansa

Deal found 19/3£576

Fri 15/805:10ONT - LHR

2 stops17h 20mMultiple Airlines

Mon 1/912:05LHR - ONT

2 stops18h 48mMultiple Airlines

Deal found 19/3£586

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

Sun 23/305:05ONT - LHR

2 stops19h 05mMultiple Airlines

Wed 2/412:05LHR - ONT

2 stops18h 50mMultiple Airlines

Deal found 20/3£762

Mon 24/305:05ONT - LHR

2 stops19h 05mAir Canada

Wed 2/409:30LHR - ONT

2 stops43h 12mAir Canada

Deal found 20/3£740

Tue 25/312:46ONT - LHR

1 stop15h 54mDelta

Fri 4/408:40LHR - ONT

2 stops21h 56mDelta

Deal found 19/3£746

Tue 25/306:00ONT - LHR

2 stops22h 15mUnited Airlines

Fri 4/406:30LHR - ONT

2 stops23h 28mUnited Airlines

Deal found 20/3£748

Tue 25/313:30ONT - LHR

1 stop13h 30mKLM

Wed 2/411:00LHR - ONT

1 stop13h 34mKLM

Deal found 20/3£943

Tue 25/323:30ONT - LHR

2 stops32h 05mAvianca

Wed 2/422:05LHR - ONT

2 stops31h 50mAvianca

Deal found 20/3£1,669

Tue 25/305:05ONT - LHR

2 stops18h 25mLufthansa

Wed 26/310:05LHR - ONT

1 stop19h 40mLufthansa

Deal found 20/3£4,974

Wed 26/310:57ONT - LHR

1 stop13h 23mIberia

Tue 1/416:25LHR - ONT

1 stop15h 29mIberia

Deal found 20/3£890

Wed 26/305:05ONT - LHR

2 stops19h 05mMultiple Airlines

Sun 30/308:30LHR - ONT

2 stops21h 28mMultiple Airlines

Deal found 18/3£1,038

Thu 27/311:42ONT - LHR

2 stops18h 08mWestJet

Mon 7/413:55LHR - ONT

2 stops58h 49mWestJet

Deal found 18/3£8,020

Sat 29/300:10ONT - LHR

1 stop32h 20mChina Airlines

Sat 12/421:10LHR - ONT

1 stop28h 50mChina Airlines

Deal found 19/3£7,412

Sat 29/312:46ONT - LHR

1 stop14h 24mAir France

Sun 13/410:55LHR - ONT

1 stop13h 38mAir France

Deal found 20/3£9,551

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 March 2025.

Sat 3/522:40ONT - LHR

1 stop14h 05mJetBlue

Deal found 20/3£304

Tue 1/414:43ONT - LHR

3 stops37h 12mMultiple Airlines

Deal found 19/3£315

Wed 30/416:35ONT - LHR

1 stop12h 15mBritish Airways

Deal found 20/3£320

Tue 8/412:42ONT - LHR

1 stop14h 28mKLM

Deal found 18/3£324

Sun 20/413:20ONT - LHR

1 stop16h 50mUnited Airlines

Deal found 19/3£326

Fri 18/416:17ONT - LHR

2 stops54h 18mAir Canada

Deal found 19/3£331

Sat 19/422:15ONT - LHR

1 stop31h 15mDelta

Deal found 20/3£338

Fri 25/712:49ONT - LHR

1 stop14h 01mIberia

Deal found 19/3£348

Tue 19/814:00ONT - LHR

1 stop16h 15mVirgin Atlantic

Deal found 19/3£376

Thu 10/406:00ONT - LHR

2 stops20h 30mAmerican Airlines

Deal found 20/3£439

Tue 6/523:25ONT - LHR

2 stops32h 10mAvianca

Deal found 19/3£597

Thu 14/814:00ONT - LHR

2 stops38h 05mWestJet

Deal found 20/3£1,781

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

Tue 1/4

10:57-09:00

1 stop14h 03m

London Heathrow

Tue 29/4

06:10-22:10

2 stops24h 00m

£474

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 6/4

16:35-12:50

1 stop12h 15m

London Heathrow

Tue 22/4

15:40-21:58

1 stop14h 18m

£494

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 6/4

07:00-07:15

1 stop16h 15m

London Heathrow

Tue 22/4

13:25-22:43

1 stop17h 18m

£496

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 27/4

12:07-13:30

1 stop17h 23m

London Heathrow

Fri 9/5

11:20-22:29

1 stop19h 09m

£503

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 11/8

17:00-12:50

1 stop11h 50m

London Heathrow

Wed 27/8

11:15-17:48

1 stop14h 33m

£516

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 2/5

18:48-06:30

2 stops51h 42m

London Heathrow

Wed 14/5

07:30-20:34

2 stops21h 04m

£516

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/5

14:35-14:15

1 stop15h 40m

London Heathrow

Wed 7/5

11:00-23:42

1 stop20h 42m

£534

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/5

05:05-10:00

2 stops44h 55m

London Heathrow

Wed 7/5

14:05-12:38

2 stops30h 33m

£536

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 13/5

13:10-09:50

1 stop12h 40m

London Heathrow

Fri 7/11

11:00-17:22

1 stop14h 22m

£569

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 3/5

22:40-20:45

1 stop14h 05m

London Heathrow

Thu 8/5

08:15-21:22

1 stop21h 07m

£573

Flights are sorted by cheapest return flights first.

Deals found on 20/3

Showing 1-10 of 25 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

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 49 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 £164). 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 Air France 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

7,895 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

7,895 reviews

Delta

8.0

Very Good

7,895 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

1,319 reviews

Delta

8.0

Very Good

7,895 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

1,422 reviews

Delta

8.0

Very Good

7,895 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

8,605 reviews

Delta

8.0

Very Good

7,895 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

7.4

Good

634 reviews

Delta

8.0

Very Good

7,895 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 £474. Other airlines that can offer you cheap pricing are British Airways, from £494, and Virgin Atlantic, from £496. Iberia is currently priced 22% 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 £304. Users have also found prices from £320 and £324 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 £112). Flying from Ontario to London Heathrow Airport in August is currently the most expensive (average of £164). 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

Hounslow

Deal

Milton Keynes

Gatwick

Croydon

Slough

Luton

Eastbourne

Northampton

Ilford

Swindon

Hayes

Crawley

Southend-on-Sea

Wembley

Maidstone

Winchester

Ipswich

Watford

Southall

Browse thousands of different options on Cheapflights for your next trip

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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 £304

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 3/5. 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 March 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 March 2025.

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?

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