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Cheap flights from the United Kingdom to Ontario from £317

LHR — ONT
22 Nov — 29 Nov1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from United Kingdom to Ontario

Thu 10/1214:45 -
1 stop16h 14m
Wed 6/107:00 -
1 stop21h 20m
Deal found 22/10£410
Wed 28/1014:45 -
1 stop34h 15m
Fri 13/1112:02 -
1 stop16h 18m
Deal found 21/10£411
Wed 4/1114:45 -
1 stop35h 32m
Tue 10/1112:02 -
1 stop16h 18m
Deal found 22/10£414
Wed 28/1014:45 -
1 stop34h 15m
Sun 8/1106:00 -
1 stop22h 20m
Deal found 19/10£415
Wed 28/1014:45 -
1 stop26h 32m
Wed 4/1112:02 -
1 stop16h 18m
Deal found 18/10£416
Wed 18/1114:45 -
1 stop28h 28m
Wed 25/1106:00 -
1 stop22h 20m
Deal found 22/10£418
Thu 26/1114:45 -
1 stop28h 26m
Thu 3/1211:57 -
1 stop16h 23m
Deal found 22/10£419
Mon 2/1114:45 -
1 stop16h 21m
Tue 17/1112:02 -
1 stop16h 18m
Deal found 21/10£420
Thu 29/1014:45 -
1 stop15h 57m
Wed 11/1112:02 -
1 stop16h 18m
Deal found 22/10£420
Thu 19/1114:45 -
1 stop32h 20m
Thu 3/1211:57 -
1 stop16h 23m
Deal found 21/10£421
Tue 27/1014:45 -
1 stop29h 31m
Sun 1/1116:09 -
1 stop36h 11m
Deal found 20/10£422
Tue 27/1014:45 -
1 stop34h 15m
Mon 2/1119:13 -
1 stop33h 07m
Deal found 19/10£423

Find flight deals from United Kingdom to Ontario

Round-trip from

£410

One-way from

£317

Popular in

December

Cheapest in

February

Average price

£492
Alaska Airlines
  • Alaska Airlines
  • 10/12-6/1
  • 2 total stops
  • 37h 34m total
  • United Kingdom to Ontario
Search Deals
18/11-31/12
  • 18/11-31/12
  • 2 total stops
  • 22h 01m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (£7 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£5 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 the United Kingdom 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 23/1

14:45-22:41

1 stop15h 56m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£356

BirminghamOntario

BHX Birmingham - ONT Ontario

BHXONT

Birmingham

Sun 8/11

13:50-19:30

3 stops37h 40m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£385

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 1/2

09:00-20:25

2 stops19h 25m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£390
Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 27/3

14:45-22:39

1 stop14h 54m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£420

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 5/11

14:45-23:06

1 stop16h 21m

Ontario

Tue 10/11

12:02-12:20

1 stop16h 18m

£426

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 14/12

14:45-22:59

1 stop16h 14m

Ontario

Sun 10/1

11:36-12:20

1 stop16h 44m

£432

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 11/12

14:45-22:59

1 stop16h 14m

Ontario

Tue 12/1

11:36-12:20

1 stop16h 44m

£432

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

14:45-22:41

1 stop15h 56m

Ontario

Mon 25/1

11:36-12:20

1 stop16h 44m

£432

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 18/2

14:45-22:39

1 stop15h 54m

Ontario

Thu 25/2

06:00-12:20

1 stop22h 20m

£437

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

09:30-20:25

2 stops18h 55m

Ontario

Wed 31/12

00:00-09:00

Nonstop0h 00m

£438

Flights are sorted by cheapest return flights first.

Deals found on 20/10

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from United Kingdom to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from United Kingdom with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from the United Kingdom to Ontario

What is the cheapest month to book a flight from United Kingdom to Ontario?

Currently, January is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £413). Flying from United Kingdom to Ontario in June is currently the most expensive (average of £659). 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.

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from the United Kingdom to Ontario, such as Alaska Airlines,Delta, andVirgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
13,116 reviews
Check prices

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

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
13,116 reviews
Alaska Airlines
7.9
Good
13,116 reviews
Check prices

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

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.
Delta
7.8
Good
8,669 reviews
Alaska Airlines
7.9
Good
13,116 reviews
Check prices

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

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
697 reviews
Alaska Airlines
7.9
Good
13,116 reviews
Check prices

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

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
7.3
Good
10,420 reviews
Alaska Airlines
7.9
Good
13,116 reviews
Check prices

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

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
8,267 reviews
Alaska Airlines
7.9
Good
13,116 reviews
Check prices

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

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 United Kingdom?

    Located just 3.1 mi from the city center, Ontario (ONT) is the airport most travelers will use when flying to Ontario from United Kingdom.

  • How long is the flight from United Kingdom to Ontario?

    For as low as £426, Alaska Airlines can have you in Ontario from United Kingdom in 16h 21m. The distance from United Kingdom to Ontario is about 5407 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from United Kingdom to Ontario?

    While some choose either London Gatwick - Ontario or Manchester - Ontario, London Heathrow - Ontario is the most popular route from United Kingdom to Ontario.

  • Can I find deals for flights from United Kingdom to Ontario that include hotel bookings?

    Yes. In addition to deals on United Kingdom to Ontario flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from United Kingdom to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from United Kingdom to Ontario.

  • Can I find deals for business class flights from United Kingdom to Ontario?

    Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to Ontario?

    Currently, January is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £413). Flying from United Kingdom to Ontario in June is currently the most expensive (average of £659). 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 United Kingdom to Ontario

AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£373Average£517FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£374Average£512FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£406Average£597FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£423Average£443FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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How does Cheapflights help users find flights from United Kingdom to Ontario?

Deals for United Kingdom to Ontario flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights simply makes it quick and affordable to book flights from United Kingdom to Ontario by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from United Kingdom to Ontario with no change fees?

Need flexible booking options for your flight to Ontario from United Kingdom? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from United Kingdom to Ontario become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ontario from United Kingdom today and book when prices fit your budget.

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