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Ontario

$415+ 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 2/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
ene. 11 — ene. 181
dom. 1/11
dom. 1/18
1 adult, Economy
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Cheapflights Tip: The best prices from London Heathrow to Ontario are usually found in September or June, booked 75 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap 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 diciembre 12, 2025.

This TravelUp deal was found by Cheapflights users on 12/10. 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.
lun. 12/152:45 pmLHR - ONT
1 stop16h 02mVirgin Atlantic
sáb. 1/106:00 amONT - LHR
1 stop20h 00mVirgin Atlantic
Deal found 12/10$676
This Delta deal was found by Cheapflights users on 12/10. 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.
lun. 12/1511:45 amLHR - ONT
2 stops31h 17mDelta
dom. 1/1110:30 pmONT - LHR
2 stops23h 50mDelta
Deal found 12/10$696
This Delta deal was found by Cheapflights users on 12/11. 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.
dom. 12/146:20 amLHR - ONT
2 stops24h 27mDelta
mié. 4/1512:00 pmONT - LHR
1 stop17h 30mDelta
Deal found 12/11$701
This Delta deal was found by Cheapflights users on 12/10. 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.
dom. 12/146:20 amLHR - ONT
2 stops24h 44mDelta
sáb. 1/101:11 pmONT - LHR
1 stop12h 49mDelta
Deal found 12/10$702
This American Airlines deal was found by Cheapflights users on 12/10. 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.
lun. 12/224:30 pmLHR - ONT
2 stops27h 23mAmerican Airlines
mié. 12/3112:45 pmONT - LHR
1 stop13h 15mAmerican Airlines
Deal found 12/10$707
This Delta deal was found by Cheapflights users on 12/11. 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.
jue. 12/258:55 amLHR - ONT
1 stop18h 55mDelta
mié. 1/71:11 pmONT - LHR
1 stop12h 49mDelta
Deal found 12/11$710
This Delta deal was found by Cheapflights users on 12/10. 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.
mié. 12/2410:45 amLHR - ONT
1 stop19h 48mDelta
vie. 1/301:10 pmONT - LHR
1 stop12h 50mDelta
Deal found 12/10$711
This Delta deal was found by Cheapflights users on 12/11. 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.
mar. 12/2310:45 amLHR - ONT
1 stop13h 27mDelta
sáb. 1/101:11 pmONT - LHR
1 stop12h 49mDelta
Deal found 12/11$712
This Delta deal was found by Cheapflights users on 12/10. 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.
sáb. 12/2010:45 amLHR - ONT
1 stop19h 43mDelta
mar. 12/3010:29 pmONT - LHR
2 stops24h 21mDelta
Deal found 12/10$713
This Virgin Atlantic deal was found by Cheapflights users on 12/9. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/1310:45 amLHR - ONT
1 stop19h 10mVirgin Atlantic
jue. 1/87:30 amONT - LHR
1 stop19h 00mVirgin Atlantic
Deal found 12/9$714
This Delta deal was found by Cheapflights users on 12/11. 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.
jue. 12/113:50 pmLHR - ONT
1 stop27h 12mDelta
lun. 12/157:05 amONT - LHR
1 stop17h 55mDelta
Deal found 12/11$716
This Virgin Atlantic deal was found by Cheapflights users on 12/9. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/1511:40 amLHR - ONT
2 stops19h 07mVirgin Atlantic
dom. 1/117:30 amONT - LHR
2 stops19h 10mVirgin Atlantic
Deal found 12/9$717

Find 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 diciembre 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$499

One-way from

$415
(British Airways)

Popular in

December

Cheapest in

September

Average price

$1,019
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. 6% potential increase in price ($51 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 diciembre 12, 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

lun. 1/12

1:45 pm-10:53 pm

1 stop17h 08m

Ontario

lun. 2/2

1:53 pm-12:00 pm

1 stop14h 07m

$499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 1/12

8:20 am-6:45 pm

1 stop18h 25m

Ontario

mar. 2/3

7:16 am-10:00 am

1 stop18h 44m

$665

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 1/12

10:00 am-9:58 pm

1 stop19h 58m

Ontario

mié. 2/4

1:53 pm-12:00 pm

1 stop14h 07m

$665

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 1/12

10:05 am-6:45 pm

1 stop16h 40m

Ontario

mié. 2/4

7:16 am-11:40 am

1 stop20h 24m

$665

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mié. 1/21

10:05 am-5:43 pm

1 stop15h 38m

Ontario

mié. 1/28

1:24 pm-9:40 am

1 stop12h 16m

$665

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 1/12

10:05 am-6:45 pm

1 stop16h 40m

Ontario

lun. 2/2

7:16 am-11:40 am

1 stop20h 24m

$665

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 1/19

10:05 am-5:43 pm

1 stop15h 38m

Ontario

mié. 2/25

1:50 pm-12:00 pm

1 stop14h 10m

$665

LondonOntario

LHR - ONT

LHRONT

London Heathrow

mar. 2/3

10:05 am-5:55 pm

1 stop15h 50m

Ontario

mié. 2/11

1:24 pm-9:40 am

1 stop12h 16m

$665

LondonOntario

LHR - ONT

LHRONT

London Heathrow

lun. 1/12

1:00 pm-12:47 pm

2 stops31h 47m

Ontario

mié. 2/4

6:00 am-11:50 am

2 stops21h 50m

$669

LondonOntario

LHR - ONT

LHRONT

London Heathrow

sáb. 3/28

4:10 pm-11:35 am

2 stops26h 25m

Ontario

sáb. 4/11

6:00 am-1:10 pm

2 stops23h 10m

$669

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 20 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
Thrive TravelPrice Accuracy3 starsTrust Score*1 star
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on London Heathrow Airport-Ontario flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 December 5, 2025.

Booking 75 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, December is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of $454). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of $539). 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 diciembre 12, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 22% on flights from London Heathrow Airport to Ontario by exploring options for tickets in the afternoon.

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 diciembre 12, 2025.
See what other customers who have flown with United Airlines from London Heathrow Airport to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,095 reviews

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Tim,Sep 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.
United Airlines
7.4
Good
9,095 reviews
United Airlines
7.4
Good
9,095 reviews

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

Comfort

7.3

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Tim,Sep 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.

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.

  • How long is the flight from London Heathrow Airport to Ontario?

    A quick flight from London Heathrow Airport to Ontario can take about 17h 08m. United Airlines provides one of the quickest options available for as low as $499. The distance from London Heathrow Airport to Ontario is about 5407 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from London Heathrow Airport to Ontario round-trip?

    Flying on United Airlines is currently your cheapest option to Ontario, with prices starting at $560. This flight start at 21% lower than the current average price 3 months from now.

  • 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, December is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of $454). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of $539). 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.

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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 diciembre 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$560Average$694FlexibilityNo cancel feeOn-time69%

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