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$452+ Cheap flights from Heathrow (LHR) to Ontario (ONT)

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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
1 adult, Economy
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Cheapflights Tip: The best prices from London Heathrow to Ontario are usually found in February or April, booked 68 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

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 March 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$519
(TravelUp)

One-way from

$452
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$699
Provider with most accurate pricing for London Heathrow-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for London Heathrow-Ontario flights.
Search Deals
From London Heathrow to Ontario
Search Deals
One-way flight from London Heathrow to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($74 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 25, 2025.

This TravelUp deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/62:45 pmLHR - ONT
2 stops40h 57mVirgin Atlantic
Sat 5/1711:46 amONT - LHR
1 stop15h 34mVirgin Atlantic
Deal found 3/23$519
This Netflights deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/223:10 pmLHR - ONT
1 stop15h 00mBritish Airways
Tue 4/294:35 pmONT - LHR
1 stop12h 15mBritish Airways
Deal found 3/23$528
This TravelUp deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2210:55 amLHR - ONT
1 stop13h 38mKLM
Tue 4/2912:07 pmONT - LHR
1 stop15h 03mKLM
Deal found 3/23$542
This American Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/123:40 pmLHR - ONT
1 stop14h 00mAmerican Airlines
Sun 9/2110:54 amONT - LHR
1 stop14h 06mAmerican Airlines
Deal found 3/24$546
This Delta deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/79:55 amLHR - ONT
2 stops20h 40mDelta
Mon 5/192:55 pmONT - LHR
1 stop15h 20mDelta
Deal found 3/23$550
This United Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/79:30 amLHR - ONT
2 stops19h 23mUnited Airlines
Wed 5/145:05 amONT - LHR
2 stops17h 40mUnited Airlines
Deal found 3/23$593
This TravelJunction deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelJunction is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2311:00 amLHR - ONT
1 stop20h 41mAir France
Wed 4/301:20 pmONT - LHR
1 stop12h 30mAir France
Deal found 3/24$634
This Booking.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/18:30 amLHR - ONT
2 stops38h 39mAir Canada
Thu 5/155:05 amONT - LHR
2 stops46h 45mAir Canada
Deal found 3/23$636
This The Travel House deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2510:30 amLHR - ONT
1 stop19h 26mFinnair
Wed 10/13:00 pmONT - LHR
1 stop15h 25mFinnair
Deal found 3/23$649
This flugladen.de deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/314:25 pmLHR - ONT
1 stop15h 29mAlaska Airlines
Mon 4/72:44 pmONT - LHR
1 stop14h 01mAlaska Airlines
Deal found 3/24$671
This KAYAK deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/203:10 pmLHR - ONT
1 stop15h 00mIberia
Sun 4/272:44 pmONT - LHR
1 stop34h 16mIberia
Deal found 3/24$673
This Expedia deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/297:30 pmLHR - ONT
2 stops33h 40mMultiple Airlines
Fri 6/206:00 amONT - LHR
2 stops21h 50mMultiple Airlines
Deal found 3/23$738

Cheapflights Fare Finder

Customize 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 2,558,603 searches. Data last updated March 25, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Fly from

Heathrow

Fly to

Ontario

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 5/6

2:45 pm-11:42 pm

2 stops40h 57m

Ontario

Sat 5/17

11:46 am-11:20 am

1 stop15h 34m

$519

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/22

3:10 pm-10:10 pm

1 stop15h 00m

Ontario

Tue 4/29

4:35 pm-12:50 pm

1 stop12h 15m

$528

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/22

10:55 am-4:33 pm

1 stop13h 38m

Ontario

Tue 4/29

12:07 pm-11:10 am

1 stop15h 03m

$542

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/7

9:55 am-10:35 pm

2 stops20h 40m

Ontario

Mon 5/19

2:55 pm-2:15 pm

1 stop15h 20m

$550

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 4/19

10:30 am-6:29 pm

1 stop15h 59m

Ontario

Fri 5/2

2:44 pm-12:45 pm

1 stop14h 01m

$579

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 5/7

9:30 am-8:53 pm

2 stops19h 23m

Ontario

Wed 5/14

5:05 am-6:45 am

2 stops17h 40m

$593

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/23

11:00 am-11:41 pm

1 stop20h 41m

Ontario

Wed 4/30

1:20 pm-9:50 am

1 stop12h 30m

$634

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 5/1

8:30 am-3:09 pm

2 stops38h 39m

Ontario

Thu 5/15

5:05 am-11:50 am

2 stops46h 45m

$636

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 3/31

4:25 pm-11:54 pm

1 stop15h 29m

Ontario

Mon 4/7

2:44 pm-12:45 pm

1 stop14h 01m

$671

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 4/20

3:10 pm-10:10 pm

1 stop15h 00m

Ontario

Sun 4/27

2:44 pm-9:00 am

1 stop34h 16m

$673

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 28 results
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2
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Compare providers for flights from Heathrow to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Ontario in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London Heathrow Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London Heathrow Airport-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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 London Heathrow Airport to Ontario

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 round-trip flight from Heathrow to Ontario. Price data was last updated on March 21, 2025.

Booking 37 days in advance of your planned departure date is, on average, the best time to get cheap flights from London Heathrow Airport to Ontario. 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 London Heathrow Airport to Ontario?

Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of $246). Flying from London Heathrow Airport to Ontario in March is currently the most expensive (average of $324). 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 March 25, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 23% on flights from London Heathrow Airport to Ontario by exploring options for tickets in the afternoon.

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 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

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 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 March 25, 2025.
Read through reviews of airlines operating flights from London to Ontario, such as Delta, Alaska Airlines and KLM. 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
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

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
7,890 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

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
Alaska Airlines
8.0
Very good
9,785 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

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
1,318 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

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
1,266 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

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
Air France
7.4
Good
1,423 reviews
Delta
8.0
Very good
7,890 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Comfort

8.0

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?

    Ontario (ONT) is the airport you will fly into if you book a flight from London Heathrow to Ontario. You should not have trouble finding flights to Ontario from London Heathrow; the airport handles an average of 0 inbound flights from London Heathrow per day. You should also have plenty of airline options to choose from since 1 airline has flights to the Ontario airport from London Heathrow. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

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

    Flying on Virgin Atlantic is currently your cheapest option to Ontario, with prices starting at $519. Additional round-trip tickets that might be worth considering are offered by British Airways and KLM, with the lowest prices starting at $528 and $542, respectively. These flights start at 28% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with Lufthansa, which is currently one of the cheapest options available, starting at $502. Iberia flights start at $530 while deals on WestJet start at $588 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 vacation 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of $246). Flying from London Heathrow Airport to Ontario in March is currently the most expensive (average of $324). 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 airline flying from Heathrow to Ontario

Discover the top airline 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 2,558,603 searches. Data last updated March 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$662Average$836FlexibilityNo cancel feeOn-time69%
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