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Cheap flights from Ontario to London Heathrow Airport from £279

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 24/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — LHR
1 Mar — 8 Mar1
1 adult
Fri 1/3
Fri 8/3

How to find the cheapest flight from Ontario (ONT) to Heathrow (LHR)

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 25 February 2024.

Popular in

July

Cheapest in

February

Average price

£484

Round-trip from

£59
High demand for flights, 28% potential price rise
Best time to find cheap flights, 27% potential price drop
Average for round-trip flights in February 2024
From Ontario to London Heathrow

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

To save up to 58% on this flight, we recommend booking at least 59 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 £707 1-2 weeks out and tickets from £987 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 £621. Cheapflights users have found deals in the month of October for as cheap as £331. The most expensive prices can be found in the month of June.

When is the cheapest time to fly from Ontario to London Heathrow Airport (ONT - 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.

Cheap Delta flights from Ontario to Heathrow

Explore cheap flight options specifically provided by Delta for the route between Ontario and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 923,741 searches. Data last updated 25 February 2024.
Take a look at some of the lowest-priced Delta flights heading from Ontario to London. Come back soon if you're not finding the exact deal you're looking for.
Sun 17/313:20ONT - LHR
1 stop14h 15mDelta
Sun 24/320:25LHR - ONT
2 stops22h 49mDelta
Deal found 24/2£572
Sat 30/315:40ONT - LHR
1 stop13h 50mDelta
Sat 13/409:20LHR - ONT
2 stops20h 17mDelta
Deal found 23/2£612
Mon 25/313:20ONT - LHR
1 stop14h 15mDelta
Fri 5/411:45LHR - ONT
2 stops20h 01mDelta
Deal found 25/2£635
Mon 25/306:00ONT - LHR
2 stops18h 05mDelta
Fri 5/411:45LHR - ONT
2 stops20h 01mDelta
Deal found 25/2£638
Sun 24/313:20ONT - LHR
1 stop14h 15mDelta
Tue 9/415:55LHR - ONT
1 stop14h 45mDelta
Deal found 25/2£640
Wed 6/307:00ONT - LHR
2 stops17h 30mDelta
Sun 10/310:10LHR - ONT
2 stops19h 39mDelta
Deal found 24/2£767
Sun 3/307:00ONT - LHR
1 stop15h 20mDelta
Thu 7/316:35LHR - ONT
1 stop14h 53mDelta
Deal found 23/2£1,145

Cheap Virgin Atlantic flights from Ontario to Heathrow

Explore cheap flight options specifically provided by Virgin Atlantic for the route between Ontario and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 923,741 searches. Data last updated 25 February 2024.
Some of the best deals we've found on Virgin Atlantic flights travelling from Ontario to London. Ensure the flight price, dates, time, and airline match your criteria before you book.
Sun 24/313:20ONT - LHR
1 stop14h 15mVirgin Atlantic
Tue 9/415:55LHR - ONT
1 stop14h 45mVirgin Atlantic
Deal found 24/2£628
Sat 2/307:00ONT - LHR
1 stop16h 15mVirgin Atlantic
Sat 9/312:20LHR - ONT
1 stop18h 07mVirgin Atlantic
Deal found 24/2£802

Cheap Ontario to Heathrow flights in February & March 2024

Find cheap flight options from Ontario to Heathrow specifically for the months of February and March 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 923,741 searches. Prices were last updated on 25 February 2024.
Scroll through some of the best deals on flights from Ontario to London in 2024. Check back in a little while for more flight options.
Tue 26/307:13ONT - LHR
1 stop16h 07mIberia
Thu 11/411:30LHR - ONT
2 stops20h 27mIberia
Deal found 23/2£492
Wed 20/314:50ONT - LHR
1 stop14h 15mAmerican Airlines
Wed 27/308:40LHR - ONT
1 stop19h 06mAmerican Airlines
Deal found 23/2£504
Tue 26/311:01ONT - LHR
1 stop13h 19mBritish Airways
Thu 11/408:40LHR - ONT
1 stop17h 27mBritish Airways
Deal found 23/2£506
Tue 26/311:01ONT - LHR
1 stop13h 19mIberia
Tue 16/416:25LHR - ONT
1 stop15h 32mIberia
Deal found 24/2£507
Wed 20/312:55ONT - LHR
2 stops16h 10mAmerican Airlines
Wed 27/308:40LHR - ONT
1 stop19h 06mAmerican Airlines
Deal found 23/2£508
Wed 20/307:13ONT - LHR
1 stop17h 07mIberia
Wed 27/309:25LHR - ONT
1 stop18h 21mIberia
Deal found 24/2£529
Wed 27/307:13ONT - LHR
1 stop16h 07mIberia
Tue 16/416:25LHR - ONT
1 stop15h 32mIberia
Deal found 25/2£530
Tue 26/307:13ONT - LHR
1 stop17h 07mIberia
Mon 15/410:50LHR - ONT
2 stops21h 07mIberia
Deal found 23/2£532
Sun 17/307:13ONT - LHR
1 stop21h 52mAmerican Airlines
Sun 24/308:40LHR - ONT
1 stop19h 06mAmerican Airlines
Deal found 24/2£544

Ontario to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 923,741 searches. Data last updated 25 February 2024.
Scroll through some of the best deals on flights from Ontario to London in 2024. Check back in a little while for more flight options.
Tue 26/307:13ONT - LHR
1 stop16h 07mIberia
Thu 11/411:30LHR - ONT
2 stops20h 27mIberia
Deal found 23/2£492
Wed 20/314:50ONT - LHR
1 stop14h 15mAmerican Airlines
Wed 27/308:40LHR - ONT
1 stop19h 06mAmerican Airlines
Deal found 23/2£504
Wed 17/414:53ONT - LHR
1 stop15h 32mIberia
Thu 25/412:00LHR - ONT
1 stop16h 14mIberia
Deal found 23/2£506
Wed 24/407:43ONT - LHR
1 stop16h 17mBritish Airways
Tue 30/410:30LHR - ONT
1 stop15h 37mBritish Airways
Deal found 24/2£507
Wed 20/312:55ONT - LHR
2 stops16h 10mAmerican Airlines
Wed 27/308:40LHR - ONT
1 stop19h 06mAmerican Airlines
Deal found 23/2£508
Tue 16/414:53ONT - LHR
1 stop31h 32mIberia
Tue 30/410:30LHR - ONT
1 stop21h 27mIberia
Deal found 25/2£510
Tue 16/415:55ONT - LHR
1 stop35h 10mBritish Airways
Tue 30/420:10LHR - ONT
2 stops35h 47mBritish Airways
Deal found 25/2£526
Wed 20/307:13ONT - LHR
1 stop17h 07mIberia
Wed 27/309:25LHR - ONT
1 stop18h 21mIberia
Deal found 24/2£529
Tue 16/414:53ONT - LHR
1 stop33h 07mIberia
Thu 25/416:25LHR - ONT
1 stop15h 32mIberia
Deal found 24/2£530

Ontario to Heathrow flights leaving soon

Find last-minute flight options from Ontario to Heathrow for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 923,741 searches. Data last updated 25 February 2024.
Check out these flights departing soon from Ontario to London. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Tue 5/307:13ONT - LHR
1 stop15h 07mBritish Airways
Tue 12/311:55LHR - ONT
1 stop17h 04mBritish Airways
Deal found 23/2£700
Sun 3/307:18ONT - LHR
1 stop15h 02mBritish Airways
Tue 12/306:20LHR - ONT
2 stops21h 26mBritish Airways
Deal found 23/2£707
Tue 5/305:23ONT - LHR
2 stops17h 07mMultiple Airlines
Tue 12/313:00LHR - ONT
2 stops27h 59mMultiple Airlines
Deal found 23/2£709
Wed 6/306:00ONT - LHR
1 stop16h 20mBritish Airways
Thu 14/309:25LHR - ONT
1 stop15h 51mBritish Airways
Deal found 23/2£721
Wed 6/306:00ONT - LHR
1 stop16h 20mBritish Airways
Tue 12/306:20LHR - ONT
2 stops21h 26mBritish Airways
Deal found 23/2£727
Tue 5/307:13ONT - LHR
1 stop15h 07mIberia
Thu 28/309:25LHR - ONT
1 stop18h 21mIberia
Deal found 24/2£732
Sun 3/318:42ONT - LHR
1 stop33h 18mUnited Airlines
Sun 10/309:30LHR - ONT
2 stops19h 31mUnited Airlines
Deal found 25/2£742
Fri 1/307:18ONT - LHR
1 stop16h 02mIberia
Thu 7/306:20LHR - ONT
2 stops22h 25mIberia
Deal found 23/2£745
Tue 5/305:23ONT - LHR
2 stops17h 07mMultiple Airlines
Mon 11/315:00LHR - ONT
2 stops28h 42mMultiple Airlines
Deal found 23/2£750

One-way flights to Heathrow from Ontario

Search for one-way flight options from Ontario to Heathrow. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 923,741 searches. Data last updated 25 February 2024.
Users travelling one-way from Ontario to London can select one of these great deals. Those seeking round-trip flights from Ontario to London should utilise the search form at the top of the page.
Fri 24/512:28ONT - LHR
2 stops39h 32mMultiple Airlines
Deal found 24/2£279
Sun 24/311:01ONT - LHR
1 stop15h 44mMultiple Airlines
Deal found 24/2£353
Sun 24/307:13ONT - LHR
1 stop17h 07mIberia
Deal found 24/2£370
Sun 17/307:13ONT - LHR
1 stop17h 07mIberia
Deal found 24/2£372
Sat 23/314:50ONT - LHR
1 stop32h 30mIberia
Deal found 24/2£375
Tue 26/323:53ONT - LHR
1 stop13h 52mJetBlue
Deal found 24/2£388
Mon 1/413:36ONT - LHR
1 stop12h 04mUnited Airlines
Deal found 24/2£391
Wed 17/713:35ONT - LHR
1 stop12h 50mUnited Airlines
Deal found 25/2£394
Sat 20/713:35ONT - LHR
1 stop33h 20mUnited Airlines
Deal found 24/2£403

Find flights from Ontario to Heathrow within your budget

Customise your flight search to find flights from Ontario to Heathrow 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, Cheapflights users made 923,741 searches. Data last updated 25 February 2024.

Fly from

Any airport

Fly to

Any airport

Budget

£492 - £711

Route

Depart

Return

Price

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 26/3

1 stop16h 07m

London Heathrow

Thu 11/4

2 stops20h 27m

£492

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 20/3

1 stop14h 15m

London Heathrow

Wed 27/3

1 stop19h 06m

£504

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 24/4

1 stop16h 17m

London Heathrow

Tue 30/4

1 stop15h 37m

£507

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Sun 17/3

1 stop14h 15m

London Heathrow

Sun 24/3

2 stops22h 49m

£572

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Sun 24/3

1 stop14h 15m

London Heathrow

Tue 9/4

1 stop14h 45m

£628

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 27/3

1 stop13h 51m

London Heathrow

Tue 16/4

1 stop18h 21m

£632

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 30/4

1 stop12h 04m

London Heathrow

Fri 17/5

1 stop14h 03m

£663

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Tue 26/3

2 stops19h 30m

London Heathrow

Wed 10/4

2 stops16h 54m

£668

OntarioLondon Heathrow

ONT - LHR

ONTLHR

Ontario

Wed 21/8

2 stops20h 15m

London Heathrow

Fri 13/9

2 stops38h 12m

£711

Flights are sorted by cheapest first

Deals found on 23/2

When is the best time to 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 28 January 2024.
To ensure you get the cheapest price possible for a flight from Ontario to London Heathrow Airport, you should look to book at least 46 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.
Search Deals

When is the cheapest time to fly from Ontario to London Heathrow Airport?

Use this chart to determine the cheapest time to fly return from Ontario to Heathrow. Price data was last updated on 18 February 2024.
Morning
Midday
Afternoon
Evening
All times are departure.
Travellers seeking maximum savings on their Ontario to London Heathrow Airport flight should consider departing on Saturday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Heathrow by month

Plan your trip from Ontario to Heathrow by taking into account the cheapest months to travel. The average price of a one-way flight from Ontario to Heathrow is currently £369 while a return flight costs £597. Price data was last updated on 18 February 2024.

Currently, January is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of £111). Flying from Ontario to London Heathrow Airport in July is currently the most expensive (average of £177). 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.

January

£88

February

£99

March

£93

April

£110

May

£112

June

£131

July

£140

August

£110

September

£109

October

£125

November

£90

December

£93

Temperature and rainfall in Heathrow by month

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

LON

Temperature

4 - 17 °C

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 25 February 2024.
Read reviews from past customers who have flown Delta, Virgin Atlantic and United Airlines 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.
8.1
Very Good
11,871 reviews

Comfort

7.9

Entertainment

8.1

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

8.1
Very Good
11,871 reviews
8.1
Very Good
11,871 reviews

Comfort

7.9

Entertainment

8.1

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

7.8
Good
1,767 reviews
8.1
Very Good
11,871 reviews

Comfort

7.9

Entertainment

8.1

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

7.7
Good
5,241 reviews
8.1
Very Good
11,871 reviews

Comfort

7.9

Entertainment

8.1

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

7.7
Good
770 reviews
8.1
Very Good
11,871 reviews

Comfort

7.9

Entertainment

8.1

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

7.6
Good
4,349 reviews
8.1
Very Good
11,871 reviews

Comfort

7.9

Entertainment

8.1

Boarding

8.2

Crew

8.6

Overall

8.1

Food

7.5

Reviews

1 / 10

Not sufficient leg room and three seats are very tigh.t on 737 in economy main cabin

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?

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 flights from Ontario to London Heathrow Airport for under £500 on Cheapflights?

Yes, there are multiple flights from Ontario to London Heathrow Airport for under £500. The cheapest flight booked recently is on Iberia for just £492, but on average you can expect to pay £542.

Are there last-minute flights available from Ontario to London Heathrow Airport for under £700?

There are currently 20+ open flights from Ontario to London Heathrow Airport within the next 7 days for less than £700.

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 £492. Other airlines that can offer you cheap pricing are American Airlines, from £504, and British Airways, from £507. 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 Iberia. According to our data, you can fly for as low as £370. Users have also found prices from £388 and £391 on JetBlue and United Airlines, respectively.

What does ONT to LHR mean?

This is defined as Ontario Airport (ONT) and London Heathrow Airport (LHR). Codes like London Heathrow Airport are often used to just call airports uniquely.

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