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Cheap flights from London Heathrow Airport to Ontario from £401

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
25 Feb — 4 Mar1
1 adult

Cheap flight deals from Heathrow to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Ontario (ONT). 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 20 February 2025.

Round-trip from

£401

Popular in

August

Cheapest in

February

Average price

£464
United Airlines
  • United Airlines
  • 20/3-27/3
  • 4 total stops
  • 37h 39m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£48 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£19 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2025
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Find flight deals from Heathrow to Ontario

Cheapest flights from Heathrow to Ontario
Explore the most affordable flight options available from Heathrow to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 February 2025.

Thu 20/306:30LHR - ONT
2 stops18h 34mUnited Airlines
Thu 27/305:05ONT - LHR
2 stops19h 05mUnited Airlines
Deal found 19/2£401
Sat 22/313:45LHR - ONT
1 stop16h 00mLufthansa
Sat 29/313:40ONT - LHR
1 stop14h 40mLufthansa
Deal found 19/2£415
Wed 19/313:15LHR - ONT
1 stop16h 07mKLM
Wed 9/413:30ONT - LHR
1 stop12h 20mKLM
Deal found 19/2£419
Sat 29/309:25LHR - ONT
1 stop16h 36mFinnair
Tue 8/414:44ONT - LHR
1 stop13h 46mFinnair
Deal found 19/2£421
Wed 19/311:10LHR - ONT
2 stops18h 35mMultiple Airlines
Wed 26/313:40ONT - LHR
2 stops15h 10mMultiple Airlines
Deal found 19/2£435
Thu 27/210:45LHR - ONT
1 stop13h 43mDelta
Wed 12/313:30ONT - LHR
1 stop13h 30mDelta
Deal found 19/2£439
Fri 28/209:25LHR - ONT
1 stop17h 10mBritish Airways
Sun 9/323:59ONT - LHR
1 stop24h 21mBritish Airways
Deal found 19/2£450
Sat 15/313:05LHR - ONT
1 stop16h 17mVirgin Atlantic
Mon 31/311:42ONT - LHR
1 stop15h 43mVirgin Atlantic
Deal found 18/2£479
Thu 13/314:10LHR - ONT
1 stop15h 17mIberia
Wed 26/310:57ONT - LHR
1 stop13h 23mIberia
Deal found 19/2£588
Thu 15/514:10LHR - ONT
2 stops30h 14mAir Canada
Tue 20/513:20ONT - LHR
2 stops36h 40mAir Canada
Deal found 19/2£618
Wed 30/408:15LHR - ONT
1 stop21h 07mJetBlue
Sat 10/522:40ONT - LHR
1 stop14h 05mJetBlue
Deal found 19/2£647

Find flights from Heathrow to Ontario within your budget

Customise your flight search to find flights from Heathrow to Ontario 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 20 February 2025.

Fly from

Heathrow

Fly to

Ontario

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 20/3

06:30-18:04

2 stops18h 34m

Ontario

Thu 27/3

05:05-07:10

2 stops19h 05m

£401

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 22/3

13:45-22:45

1 stop16h 00m

Ontario

Sat 29/3

13:40-11:20

1 stop14h 40m

£415

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 19/3

13:15-22:22

1 stop16h 07m

Ontario

Wed 9/4

13:30-09:50

1 stop12h 20m

£419

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 29/3

09:25-19:01

1 stop16h 36m

Ontario

Tue 8/4

14:44-12:30

1 stop13h 46m

£421

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 19/3

11:10-22:45

2 stops18h 35m

Ontario

Wed 26/3

13:40-11:50

2 stops15h 10m

£435

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 15/3

13:05-22:22

1 stop16h 17m

Ontario

Mon 31/3

11:42-11:25

1 stop15h 43m

£479

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 25/3

14:30-22:00

1 stop14h 30m

Ontario

Tue 1/4

16:30-12:50

1 stop12h 20m

£550

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 13/3

14:10-22:27

1 stop15h 17m

Ontario

Wed 26/3

10:57-07:20

1 stop13h 23m

£588

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/4

13:25-22:23

1 stop16h 58m

Ontario

Sat 26/4

14:35-14:15

1 stop15h 40m

£607

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 15/5

14:10-12:24

2 stops30h 14m

Ontario

Tue 20/5

13:20-10:00

2 stops36h 40m

£618

Flights are sorted by cheapest return flights first.

Deals found on 19/2

Showing 1-10 of 26 results
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Best time to book a flight from Heathrow to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Heathrow 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 Heathrow to Ontario

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

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

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

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to Ontario, you should look to book at least 68 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 London Heathrow Airport to Ontario?

Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £516). Flying from London Heathrow Airport to Ontario in August is currently the most expensive (average of £827). 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 LHR to ONT?

Find hourly flight availability from Heathrow to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 20 February 2025.

It’s optimal to fly from London Heathrow Airport to Ontario in the afternoon. By choosing this option you can save up to 24% on the cost of your flight, compared to a flight at midday.

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 3.0 - 86.0 inches per month. February is typically the wettest month, when rainfall can reach 86.0 mm. June is typically the driest time to visit Ontario when rainfall is around 3.0 mm.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 26.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 12.0 C).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated 20 February 2025.
Read through reviews of airlines operating flights from London to Ontario, such as Delta, KLM and Finnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
8,236 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very Good
8,236 reviews
Delta
8.0
Very Good
8,236 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,333 reviews
Delta
8.0
Very Good
8,236 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair
7.6
Good
1,274 reviews
Delta
8.0
Very Good
8,236 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Virgin Atlantic
7.5
Good
654 reviews
Delta
8.0
Very Good
8,236 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines
7.4
Good
8,771 reviews
Delta
8.0
Very Good
8,236 reviews
Check prices

Overall

8.0

Comfort

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

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

    If you book a flight to Ontario from London Heathrow, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from London Heathrow to Ontario per day from 5 different airlines.

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

    Currently priced at £401, United Airlines will fly you from London Heathrow Airport to Ontario and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Lufthansa and KLM - these airlines can fly you to your destination from £415 and £419, respectively. Users have found that United Airlines is 30% cheaper than the other options available to this destination.

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

    To fly one-way, consider booking your trip with Iberia, which is currently one of the cheapest options available, starting at £462. Lufthansa flights start at £478 while deals on Finnair start at £491 one-way.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow to Ontario 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 London Heathrow Airport to Ontario?

    Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £516). Flying from London Heathrow Airport to Ontario in August is currently the most expensive (average of £827). 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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Alternative routes for Heathrow to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Heathrow to Ontario

Discover the top 5 airlines that operate flights from Heathrow to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 20 February 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£431Average£544FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£433Average£689FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£435Average£520FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£459Average£555FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£524Average£689FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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 Heathrow to Ontario?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

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

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

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

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

Yes, Cheapflights offers price alerts on Heathrow to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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