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Cheap flights from Ontario to London from £155

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 27/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LON
26 Nov — 3 Dec1
1 adult

Cheap flight deals from Ontario to London

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to London (LON). 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 21 November 2024.

Round-trip from

£429

One-way from

£155

Popular in

June

Cheapest in

January
2/12-12/12
  • 2/12-12/12
  • 2 total stops
  • 44h 29m total
  • Ontario to London
Search Deals
27/11
  • 27/11
  • 1 total stop
  • 28h 24m total
  • Ontario to London
Search Deals
High demand for flights, 32% potential price rise
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Best time to find cheap flights, 17% potential price drop
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Find flight deals from Ontario to London

Cheapest flights from Ontario to London
Explore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 November 2024.

Mon 2/1222:05ONT - LGW
1 stop28h 30mMultiple Airlines
Thu 12/1212:00LGW - ONT
1 stop15h 59mMultiple Airlines
Deal found 20/11£429
Wed 4/1206:10ONT - LGW
2 stops18h 50mAmerican Airlines
Thu 12/1212:30LGW - ONT
2 stops29h 21mAmerican Airlines
Deal found 20/11£504
Wed 4/1206:00ONT - LHR
1 stop20h 00mDelta
Thu 12/1206:30LHR - ONT
2 stops24h 32mDelta
Deal found 20/11£520
Sun 8/1207:16ONT - LHR
1 stop16h 04mBritish Airways
Wed 25/1209:25LHR - ONT
1 stop21h 03mBritish Airways
Deal found 19/11£529
Mon 9/1212:11ONT - LHR
1 stop14h 24mKLM
Fri 17/112:30LHR - ONT
1 stop18h 22mKLM
Deal found 19/11£532
Wed 4/1210:43ONT - LHR
1 stop12h 37mIberia
Fri 14/213:50LHR - ONT
1 stop16h 10mIberia
Deal found 19/11£533
Tue 24/1212:55ONT - LHR
2 stops15h 45mVirgin Atlantic
Sun 12/110:45LHR - ONT
1 stop13h 43mVirgin Atlantic
Deal found 20/11£689
Mon 30/1213:57ONT - LHR
1 stop14h 03mUnited Airlines
Tue 14/110:05LHR - ONT
1 stop15h 59mUnited Airlines
Deal found 19/11£792
Thu 28/1112:30ONT - LHR
1 stop14h 05mMultiple Airlines
Sun 29/1210:45LHR - ONT
1 stop21h 43mMultiple Airlines
Deal found 20/11£811
Tue 3/1206:00ONT - LHR
2 stops20h 10mAir Canada
Tue 10/1215:00LHR - ONT
2 stops37h 47mAir Canada
Deal found 19/11£890
Mon 9/1212:11ONT - LHR
2 stops16h 29mAir France
Fri 20/1216:10LHR - ONT
2 stops32h 08mAir France
Deal found 19/11£989
Wed 11/1213:53ONT - LCY
2 stops19h 37mMultiple Airlines
Fri 20/1206:50LCY - ONT
2 stops25h 09mMultiple Airlines
Deal found 20/11£1,126

Find flights from Ontario to London within your budget

Customise your flight search to find flights from Ontario to London 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 939,815 searches. Data last updated 21 November 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 2/12

22:05-10:35

1 stop28h 30m

London Gatwick

Thu 12/12

12:00-19:59

1 stop15h 59m

£429

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 4/12

06:10-09:00

2 stops18h 50m

London Gatwick

Thu 12/12

12:30-09:51

2 stops29h 21m

£504

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 4/12

06:00-10:00

1 stop20h 00m

London Heathrow

Thu 12/12

06:30-23:02

2 stops24h 32m

£520

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 9/12

12:11-10:35

1 stop14h 24m

London Heathrow

Fri 17/1

12:30-22:52

1 stop18h 22m

£532

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 7/1

07:00-06:55

2 stops15h 55m

London Heathrow

Mon 13/1

20:25-16:28

2 stops28h 03m

£533

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 4/12

10:43-07:20

1 stop12h 37m

London Heathrow

Fri 14/2

13:50-22:00

1 stop16h 10m

£534

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 29/4

10:58-09:00

1 stop14h 02m

London Heathrow

Fri 16/5

11:00-21:40

1 stop18h 40m

£547

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 7/2

12:48-13:20

1 stop16h 32m

London Heathrow

Fri 14/2

10:40-18:35

1 stop15h 55m

£571

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Fri 17/1

10:56-18:50

2 stops23h 54m

London Gatwick

Sun 2/2

10:55-23:58

2 stops21h 03m

£609

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 20/1

06:00-18:50

2 stops28h 50m

London Gatwick

Mon 2/6

10:50-23:35

2 stops20h 45m

£753

Flights are sorted by cheapest return flights first.

Deals found on 20/11

Showing 1-10 of 35 results
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Best time to book a flight from Ontario to London

Have a flexible travel schedule? Discover the best time to fly to London 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 London

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

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

Use this chart to determine the optimal time to book a return flight from Ontario to London. Price data was last updated on 15 November 2024.

Booking 72 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, January is the cheapest month in which you can book a flight from Ontario to London (average of £112). Flying from Ontario to London in July is currently the most expensive (average of £160). 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 LON?

Find hourly flight availability from Ontario to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 November 2024.

One of the essential ways to save on airfare from Ontario to London is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight at midday could potentially save you up to 8% on airfare.

Rainfall in London by month

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

In terms of precipitation, rainfall in London 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 when rainfall is around 40.0 mm.

Temperature in London by month

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

If weather is an important factor for your trip to London, 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 London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 21 November 2024.
Get a feel of what it's like to fly with Delta, KLM and Virgin Atlantic from Ontario to London by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
8,756 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 10

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

Delta
8.0
Very Good
8,756 reviews
Delta
8.0
Very Good
8,756 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 10

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

KLM
7.8
Good
1,350 reviews
Delta
8.0
Very Good
8,756 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 10

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

Virgin Atlantic
7.5
Good
663 reviews
Delta
8.0
Very Good
8,756 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 10

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

Air France
7.4
Good
1,523 reviews
Delta
8.0
Very Good
8,756 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 10

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

United Airlines
7.4
Good
9,171 reviews
Delta
8.0
Very Good
8,756 reviews
Check prices

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 10

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

Related info for your journey

Find useful and relevant information for your journey from Ontario to London. 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?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to London. 0 airlines have flights from Ontario to London on a regular basis. Booking flights from Ontario to London should not be difficult; the airport handles an average of 0 outbound flights to London per day.

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

    American Airlines, at £504, was found to be the cheapest airline from Ontario to London.Alternate airlines flying return to your destination include Delta and KLM. Users have found that American Airlines is 15% cheaper than the other options available to this destination.

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

    £315 is the cheapest one-way deal found within the past few days, from Virgin Atlantic. You may also be able to find cheap deals on British Airways and Delta, with prices starting from £321 and £324, respectively.

  • What are the most popular routes from Ontario to London?

    When deciding which route to take from Ontario to London consider Ontario - London Heathrow, Ontario - London Gatwick or Ontario - London City as they are the most popular.

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

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

  • How can I find direct flights from Ontario to London?

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

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

    Yes. Cheapflights offers flight deals from Ontario to London 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?

    Currently, January is the cheapest month in which you can book a flight from Ontario to London (average of £112). Flying from Ontario to London in July is currently the most expensive (average of £160). 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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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 London?

Cheapflights helps you search for flights from Ontario to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ontario to London for you. Better yet — we are completely free to use.

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

Yes! Cheapflights helps users easily find flights from Ontario to London with no change fees.

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

Yes! Start tracking prices for Ontario to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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