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$485+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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Cheapflights Tip: The best prices from London Heathrow to Ontario are usually found in February or September, booked 82 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 July 28, 2025.

Round-trip from

$544
(Netflights)

One-way from

$485
(Kiwi.com)

Popular in

April

Cheapest in

February

Average price

$787
From London Heathrow to Ontario
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One-way flight from London Heathrow to Ontario
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Highest demand for flights based on searches. 8% potential increase in price ($66 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 28, 2025.

This Netflights deal was found by Cheapflights users on 7/27. 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.
Sun 9/144:25 pmLHR - ONT
1 stop15h 34mBritish Airways
Sun 9/2110:55 amONT - LHR
1 stop15h 55mBritish Airways
Deal found 7/27$544
This flugladen.de deal was found by Cheapflights users on 7/27. 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.
Wed 9/106:15 amLHR - ONT
2 stops20h 39mMultiple Airlines
Wed 9/1712:47 pmONT - LHR
1 stop14h 03mMultiple Airlines
Deal found 7/27$569
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Wed 9/311:15 amLHR - ONT
1 stop15h 01mAmerican Airlines
Sun 9/211:10 pmONT - LHR
1 stop17h 30mAmerican Airlines
Deal found 7/27$572
This Iberia deal was found by Cheapflights users on 7/27. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/189:15 amLHR - ONT
2 stops21h 33mIberia
Mon 9/158:15 amONT - LHR
1 stop18h 35mIberia
Deal found 7/27$582
This World Air Fares deal was found by Cheapflights users on 7/28. 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 World Air Fares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/73:40 pmLHR - ONT
1 stop14h 08mFinnair
Sun 9/1410:55 amONT - LHR
2 stops16h 10mFinnair
Deal found 7/28$585
This United Airlines deal was found by Cheapflights users on 7/27. 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 9/108:40 amLHR - ONT
2 stops21h 50mUnited Airlines
Wed 9/171:42 pmONT - LHR
1 stop12h 43mUnited Airlines
Deal found 7/27$626

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 July 28, 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

Sun 9/14

4:25 pm-11:59 pm

1 stop15h 34m

Ontario

Sun 9/21

10:55 am-10:50 am

1 stop15h 55m

$544

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/10

6:15 am-6:54 pm

2 stops20h 39m

Ontario

Wed 9/17

12:47 pm-10:50 am

1 stop14h 03m

$569

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/3

11:15 am-6:16 pm

1 stop15h 01m

Ontario

Sun 9/21

1:10 pm-2:40 pm

1 stop17h 30m

$572

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 8/18

9:15 am-10:48 pm

2 stops21h 33m

Ontario

Mon 9/15

8:15 am-10:50 am

1 stop18h 35m

$582

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 9/7

3:40 pm-9:48 pm

1 stop14h 08m

Ontario

Sun 9/14

10:55 am-11:05 am

2 stops16h 10m

$585

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/10

8:40 am-10:30 pm

2 stops21h 50m

Ontario

Wed 9/17

1:42 pm-10:25 am

1 stop12h 43m

$626

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 9/10

7:50 pm-11:38 pm

2 stops35h 48m

$485

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 9/8

3:10 pm-10:33 pm

1 stop15h 23m

$631

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 8/24

3:10 pm-10:14 pm

1 stop15h 04m

$650

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 10/11

2:10 pm-10:49 pm

2 stops16h 39m

$690

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 13 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 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 July 25, 2025.

Booking 80 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 $328). 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 July 28, 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.

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 July 28, 2025.
See what other customers who have flown with Finnair, United Airlines, and JetBlue 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.
Finnair
7.6
Good
1,316 reviews

Crew

8.1

Food

6.7

Boarding

7.6

Overall

7.6

Comfort

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
Finnair
7.6
Good
1,316 reviews
Finnair
7.6
Good
1,316 reviews

Crew

8.1

Food

6.7

Boarding

7.6

Overall

7.6

Comfort

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
United Airlines
7.4
Good
8,892 reviews
Finnair
7.6
Good
1,316 reviews

Crew

8.1

Food

6.7

Boarding

7.6

Overall

7.6

Comfort

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
JetBlue
7.3
Good
2,914 reviews
Finnair
7.6
Good
1,316 reviews

Crew

8.1

Food

6.7

Boarding

7.6

Overall

7.6

Comfort

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
American Airlines
7.2
Good
10,000 reviews
Finnair
7.6
Good
1,316 reviews

Crew

8.1

Food

6.7

Boarding

7.6

Overall

7.6

Comfort

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.
WestJet
7.2
Good
2,968 reviews
Finnair
7.6
Good
1,316 reviews

Crew

8.1

Food

6.7

Boarding

7.6

Overall

7.6

Comfort

7.5

Entertainment

6.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

FRA - DFW

I was lucky I had a seet without no one next to me My vegetarian meal was excellent. The service very good. Although there was a lot of turbulences during the flight, the landing was very soft and took away all our apprehension.

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 British Airways is currently your cheapest option to Ontario, with prices starting at $544. Additional round-trip tickets that might be worth considering are offered by American Airlines and Iberia, with the lowest prices starting at $572 and $582, respectively. These flights start at 23% 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 British Airways, which is currently one of the cheapest options available, starting at $631. Iberia flights start at $650 while deals on WestJet start at $690 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 $328). 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

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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 July 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$560Average$694FlexibilityNo cancel feeOn-time69%

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