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Cheap flights from Ontario to London from £259

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 16/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LON
22 Jan — 29 Jan1
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 17 January 2025.

Round-trip from

£519

One-way from

£259

Popular in

June

Cheapest in

September

Average price

£559
Iberia
  • Iberia
  • 9/2-20/2
  • 3 total stops
  • 39h 04m total
  • Ontario to London
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16/2
  • 16/2
  • 1 total stop
  • 16h 11m total
  • Ontario to London
Search Deals
High demand for flights, 15% potential price rise
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Best time to find cheap flights, 4% potential price drop
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Average for round-trip flights in January 2025
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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 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 19/108:01ONT - LGW
1 stop18h 34mMultiple Airlines
Sun 26/112:00LGW - ONT
1 stop15h 59mMultiple Airlines
Deal found 17/1£533
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
Tue 21/1015:00ONT - LGW
2 stops21h 00mIberia
Wed 29/1019:35LGW - ONT
2 stops57h 25mIberia
Deal found 16/1£577
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

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 858,174 searches. Data last updated 17 January 2025.

Fly from

Any airport

Fly to

Any airport

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 - LGW

ONTLGW

Ontario

Sun 2/2

08:01-10:35

1 stop18h 34m

London Gatwick

Sun 9/2

12:00-19:59

1 stop15h 59m

£559

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 - LGW

ONTLGW

Ontario

Sun 2/2

14:44-18:50

2 stops20h 06m

London Gatwick

Sun 9/2

11:00-23:58

2 stops20h 58m

£579

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

Flights are sorted by cheapest return flights first.

Deals found on 16/1

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 10 January 2025.

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 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 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 17 January 2025.

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 morning tend to be the most expensive. A flight at midday could potentially save you up to 18% 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 17 January 2025.
Get a feel of what it's like to fly with Delta, KLM and British Airways 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.
China Airlines
8.2
Very Good
737 reviews
Check prices

Overall

8.2

Boarding

8.3

Entertainment

8.0

Food

7.8

Crew

8.5

Comfort

8.0

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

Overall

8.2

Boarding

8.3

Entertainment

8.0

Food

7.8

Crew

8.5

Comfort

8.0

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

Overall

8.2

Boarding

8.3

Entertainment

8.0

Food

7.8

Crew

8.5

Comfort

8.0

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

Overall

8.2

Boarding

8.3

Entertainment

8.0

Food

7.8

Crew

8.5

Comfort

8.0

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

Overall

8.2

Boarding

8.3

Entertainment

8.0

Food

7.8

Crew

8.5

Comfort

8.0

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

Overall

8.2

Boarding

8.3

Entertainment

8.0

Food

7.8

Crew

8.5

Comfort

8.0

Reviews

1 / 10

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

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?

    Iberia, at £519, was found to be the cheapest airline from Ontario to London.Alternate airlines flying return to your destination include Virgin Atlantic and British Airways. Users have found that Iberia is 17% cheaper than the other options available to this destination.

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

    £303 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Iberia and British Airways, with prices starting from £332 and £340, 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 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

Travelling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Deal
Hounslow
Gatwick
Milton Keynes
Croydon
Luton
Slough
Ilford
Hayes
Eastbourne
Maidstone
Winchester
Southend-on-Sea
Wembley
Ipswich
Watford
Crawley
Southall
Stansted
High Wycombe

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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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