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Cheap flights from London Heathrow Airport to Ontario from £348

LHR — ONT
9 Nov — 16 Nov1
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

Thu 29/1014:45 -
1 stop26h 32m
Tue 3/1112:02 -
1 stop16h 18m
Deal found 9/10£418
Fri 6/1114:45 -
1 stop16h 21m
Fri 13/1112:02 -
1 stop16h 18m
Deal found 9/10£419
Mon 2/1114:45 -
1 stop16h 21m
Fri 13/1112:02 -
1 stop16h 18m
Deal found 6/10£420
Fri 6/1114:45 -
1 stop16h 21m
Sun 22/1111:55 -
1 stop16h 25m
Deal found 8/10£421
Wed 14/1017:00 -
1 stop28h 16m
Wed 28/1014:13 -
1 stop15h 07m
Deal found 6/10£423
Wed 28/1014:45 -
1 stop26h 32m
Wed 11/1106:00 -
1 stop22h 20m
Deal found 8/10£424
Wed 14/1017:00 -
1 stop28h 16m
Thu 22/1014:13 -
1 stop16h 52m
Deal found 6/10£427
Thu 22/1017:00 -
1 stop25h 17m
Mon 26/1006:02 -
1 stop23h 18m
Deal found 6/10£428

Find flight deals from Heathrow to Ontario

Round-trip from

£418

One-way from

£348

Popular in

July

Cheapest in

January

Average price

£474
Alaska Airlines
  • Alaska Airlines
  • 29/10-3/11
  • 2 total stops
  • 42h 50m total
  • London to Ontario
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 1/12-31/12
  • 1 total stop
  • 28h 28m total
  • London to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£57 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 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

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 5/12

14:45-16:05

1 stop33h 20m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£358

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 8/12

14:45-11:13

1 stop28h 28m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£358

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 2/11

14:45-23:06

1 stop16h 21m

Ontario

Wed 11/11

06:00-12:20

1 stop22h 20m

£437

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 6/1

07:40-22:15

2 stops22h 35m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£440

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 4/11

14:45-18:17

1 stop35h 32m

Ontario

Wed 11/11

06:00-12:20

1 stop22h 20m

£443

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 15/12

06:35-17:36

2 stops19h 01m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£474

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sun 1/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 5/11

12:02-12:20

1 stop16h 18m

£543

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 29/10

09:00-22:48

2 stops20h 48m

Ontario

Wed 11/11

05:00-09:40

1 stop20h 40m

£560

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 3/11

07:30-20:51

2 stops21h 21m

Ontario

Tue 10/11

06:00-05:55

2 stops15h 55m

£564

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 23/11

21:35-20:50

2 stops31h 15m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£578

Flights are sorted by cheapest return flights first.

Deals found on 5/10

Showing 1-10 of 21 resultsSorted by cheapest first
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2
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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 £418). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £623). 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 £465 and £491 in October.
The cheapest return price found within the last 5 days was £418 on Alaska Airlines (29 Oct–3 Nov).

Reviews of airlines servicing Ontario

Read reviews from past customers who have flown with Alaska Airlines,Virgin Atlantic, andUnited Airlines 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.
Alaska Airlines
7.9
Good
13,045 reviews
Check prices

Comfort

7.8

Food

7.0

Entertainment

7.0

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Alaska Airlines
7.9
Good
13,045 reviews
Alaska Airlines
7.9
Good
13,045 reviews
Check prices

Comfort

7.8

Food

7.0

Entertainment

7.0

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Virgin Atlantic
7.5
Good
694 reviews
Alaska Airlines
7.9
Good
13,045 reviews
Check prices

Comfort

7.8

Food

7.0

Entertainment

7.0

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
United Airlines
7.4
Good
10,337 reviews
Alaska Airlines
7.9
Good
13,045 reviews
Check prices

Comfort

7.8

Food

7.0

Entertainment

7.0

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
British Airways
6.7
Okay
8,256 reviews
Alaska Airlines
7.9
Good
13,045 reviews
Check prices

Comfort

7.8

Food

7.0

Entertainment

7.0

Overall

7.9

Boarding

8.1

Crew

8.5

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.

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 4 different airlines.

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

    Alaska Airlines and United Airlines can get you from London Heathrow Airport to Ontario in just under 16h 21m. Your travel time can differ by up to 4h 27m. The distance between London Heathrow Airport and Ontario is about 5407 mi. This flight may include one or multiple stops.

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

    Currently priced at £378, 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 £379 and £411, respectively. Users have found that United Airlines is 26% 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 £418). Flying from London Heathrow Airport to Ontario in July is currently the most expensive (average of £623). 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

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Top 4 airlines flying from Heathrow to Ontario

AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£378Average£523FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£379Average£518FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£411Average£523FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£432Average£448FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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

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

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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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