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Cheap flights from London Heathrow Airport to Ontario from £347

LHR — ONT
6 Oct — 13 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Ontario

Wed 25/1109:00 -
2 stops19h 02m
Sun 6/1216:03 -
1 stop31h 22m
Deal found 3/9£377
Wed 4/1109:00 -
2 stops19h 15m
Wed 11/1106:00 -
1 stop17h 40m
Deal found 2/9£378
Mon 19/1006:55 -
2 stops40h 27m
Sun 25/1006:00 -
1 stop22h 15m
Deal found 3/9£381
Thu 15/1007:30 -
2 stops21h 01m
Tue 20/1011:10 -
2 stops17h 50m
Deal found 4/9£382
Wed 4/1108:40 -
2 stops46h 03m
Fri 4/1213:11 -
2 stops57h 54m
Deal found 3/9£388
Thu 10/911:40 -
1 stop19h 00m
Wed 23/911:54 -
1 stop15h 26m
Deal found 1/9£399
Wed 25/1106:30 -
2 stops24h 30m
Sun 6/1212:20 -
1 stop35h 30m
Deal found 2/9£401
Mon 19/1011:40 -
1 stop19h 03m
Sun 25/1012:16 -
1 stop13h 44m
Deal found 3/9£402

Find flight deals from Heathrow to Ontario

Round-trip from

£377

One-way from

£347

Popular in

July

Cheapest in

January

Average price

£498
United Airlines
  • United Airlines
  • 25/11-6/12
  • 3 total stops
  • 50h 24m total
  • London to Ontario
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 23/10-31/12
  • 1 total stop
  • 25h 17m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£52 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 13/11

14:45-23:06

1 stop16h 21m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£354

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

07:30-20:20

3 stops20h 50m

Ontario

Mon 25/1

18:53-07:25

1 stop28h 32m

£389

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 20/10

13:00-20:31

1 stop15h 31m

Ontario

Tue 3/11

13:35-11:15

1 stop13h 40m

£405

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 21/9

13:00-20:01

1 stop15h 01m

Ontario

Tue 6/10

16:03-14:10

1 stop14h 07m

£405

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 19/9

13:40-21:59

1 stop16h 19m

Ontario

Mon 21/9

09:01-07:25

1 stop14h 24m

£405

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 24/9

16:15-22:59

1 stop14h 44m

Ontario

Mon 28/9

13:52-11:10

1 stop13h 18m

£405

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 4/11

13:45-20:15

1 stop14h 30m

Ontario

Wed 11/11

13:35-11:15

1 stop13h 40m

£406

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 2/11

10:25-18:47

1 stop16h 22m

Ontario

Sun 8/11

13:29-09:40

1 stop12h 11m

£406

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 1/12

11:35-20:20

1 stop16h 45m

Ontario

Wed 9/12

13:40-09:40

1 stop12h 00m

£406

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 30/10

13:45-22:48

1 stop16h 03m

Ontario

Sun 15/11

07:00-05:55

1 stop14h 55m

£407

Flights are sorted by cheapest return flights first.

Deals found on 4/9

Showing 1-10 of 22 resultsSorted by cheapest first
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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

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Ontario

What is the cheapest month to book a flight from London Heathrow Airport to Ontario?

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £409). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £613). 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.

How much does it cost for a return flight from London Heathrow Airport to Ontario?

Airfare is below average for this route at the moment.

London Heathrow Airport to Ontario flights typically cost between £478 and £575 in November.
The cheapest return price found within the last 5 days was £377 on United Airlines (25 Nov–6 Dec).

Reviews of airlines servicing Ontario

Read reviews from past customers who have flown with United Airlines,Virgin Atlantic, andBritish Airways from London Heathrow Airport to Ontario. 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.
United Airlines
7.4
Good
10,172 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Tim,Sept 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
10,172 reviews
United Airlines
7.4
Good
10,172 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Tim,Sept 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.
Virgin Atlantic
7.4
Good
696 reviews
United Airlines
7.4
Good
10,172 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Tim,Sept 2025

LHR - IAD

The premium economy seats were very comfortable and the attention and service by the flight attendants was superb.
British Airways
6.7
Okay
8,209 reviews
United Airlines
7.4
Good
10,172 reviews
Check prices

Comfort

7.3

Boarding

7.7

Food

6.6

Crew

8.1

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Tim,Sept 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

  • 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 3 different airlines.

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

    United Airlines can get you from London Heathrow Airport to Ontario in just under 20h 50m. Your travel time can differ by up to . The distance between London Heathrow Airport and Ontario is about 5407 mi.

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

    Currently priced at £367, 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 Virgin Atlantic and British Airways - these airlines can fly you to your destination from £371 and £385, respectively. Users have found that United Airlines is 28% cheaper than the other options available to this destination.

  • 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, January is the cheapest month in which you can book a flight from London Heathrow Airport to Ontario (average of £409). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £613). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Heathrow to Ontario

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Top 3 airlines flying from Heathrow to Ontario

AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£367Average£558FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£371Average£498FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£385Average£512FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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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