Find flights
When to book
Airlines
FAQs

Cheap flights from the United Kingdom to Ontario from £258

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 20/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — ONT
21 Feb — 28 Feb1
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
Explore the most affordable flight options available from United Kingdom to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 January 2026.

Sun 1/306:30
LHR
-
ONT
2 stops38h 08m
United Airlines
Sun 15/306:15
ONT
-
LHR
1 stop18h 10m
United Airlines
Deal found 21/1£346
Sat 7/311:30
LHR
-
ONT
2 stops19h 27m
United Airlines
Sat 14/313:40
ONT
-
LHR
1 stop34h 45m
United Airlines
Deal found 21/1£347
Mon 27/409:30
LHR
-
ONT
2 stops20h 20m
United Airlines
Sat 9/506:00
ONT
-
LHR
2 stops19h 40m
United Airlines
Deal found 20/1£358
Thu 29/108:30
LHR
-
ONT
2 stops21h 28m
United Airlines
Wed 11/205:05
ONT
-
LHR
2 stops16h 50m
United Airlines
Deal found 20/1£360
Sun 1/310:45
LHR
-
ONT
1 stop13h 17m
Virgin Atlantic
Sun 15/317:53
ONT
-
LHR
1 stop35h 02m
Virgin Atlantic
Deal found 21/1£362
Sat 21/208:30
LHR
-
ONT
2 stops36h 13m
United Airlines
Sat 14/318:37
ONT
-
LHR
1 stop29h 48m
United Airlines
Deal found 20/1£366
Mon 9/210:05
LHR
-
ONT
1 stop15h 38m
United Airlines
Mon 16/213:50
ONT
-
LHR
1 stop14h 10m
United Airlines
Deal found 19/1£369
Thu 19/310:25
LHR
-
ONT
1 stop18h 53m
United Airlines
Thu 26/313:50
ONT
-
LHR
1 stop12h 50m
United Airlines
Deal found 21/1£370
Mon 27/410:25
LGW
-
ONT
2 stops20h 12m
Delta
Sat 9/511:55
ONT
-
LGW
2 stops19h 50m
Delta
Deal found 20/1£418
Tue 27/109:25
MAN
-
ONT
2 stops20h 33m
United Airlines
Wed 25/208:00
ONT
-
MAN
2 stops20h 20m
United Airlines
Deal found 20/1£457
Tue 17/206:00
MAN
-
ONT
2 stops19h 41m
United Airlines
Tue 24/206:10
ONT
-
MAN
2 stops22h 10m
United Airlines
Deal found 22/1£458
Tue 24/209:05
GLA
-
ONT
2 stops20h 00m
Delta
Wed 4/313:15
ONT
-
GLA
2 stops19h 20m
Delta
Deal found 21/1£462

Find flight deals from United Kingdom to Ontario

Keep the following information in mind while searching for United Kingdom to Ontario flight deals. Data was last updated 22 January 2026.

Round-trip from

£346

One-way from

£258

Popular in

December

Cheapest in

September

Average price

£442
United Airlines
  • United Airlines
  • 1/3-15/3
  • 3 total stops
  • 56h 18m total
  • United Kingdom to Ontario
Search Deals
20/2
  • 20/2
  • 2 total stops
  • 31h 11m total
  • United Kingdom to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£14 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 January 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from United Kingdom 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 858,174 searches. Data last updated 22 January 2026.
Use the filters below to find and compare flights from the United Kingdom to Ontario that are best for you.

Fly from

United Kingdom

Fly to

Ontario

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/3

06:30-12:38

2 stops38h 08m

Ontario

Sun 15/3

06:15-07:25

1 stop18h 10m

£346

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 27/4

09:30-21:50

2 stops20h 20m

Ontario

Sat 9/5

06:00-12:20

2 stops22h 20m

£359

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 11/2

10:05-17:43

1 stop15h 38m

Ontario

Wed 18/2

13:50-12:00

1 stop14h 10m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 21/2

10:05-17:41

1 stop15h 36m

Ontario

Sat 28/2

13:53-12:00

1 stop14h 07m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 17/2

10:05-17:41

1 stop15h 36m

Ontario

Tue 10/3

13:50-09:40

1 stop12h 50m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 7/2

10:05-17:51

1 stop15h 46m

Ontario

Wed 11/2

13:53-12:00

1 stop14h 07m

£369

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 10/2

10:05-17:43

1 stop15h 38m

Ontario

Tue 17/2

13:50-12:00

1 stop14h 10m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 4/3

10:05-17:41

1 stop15h 36m

Ontario

Wed 25/3

13:50-09:40

1 stop12h 50m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 21/2

10:05-17:41

1 stop15h 36m

Ontario

Tue 17/3

13:40-12:00

1 stop15h 20m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 18/2

10:05-17:41

1 stop15h 36m

Ontario

Wed 11/3

13:40-12:00

1 stop15h 20m

£370

Flights are sorted by cheapest return flights first.

Deals found on 21/1

Showing 1-10 of 60 results
1
2
3
...
6

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
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 the United Kingdom to Ontario

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

Currently, September is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £238). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £395). 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

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 22 January 2026.
Read through reviews of airlines operating flights from the United Kingdom to Ontario, such as Finnair, Virgin Atlantic, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,353 reviews
Check prices

Food

6.7

Crew

8.2

Overall

7.6

Comfort

7.5

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Finnair
7.6
Good
1,353 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Food

6.7

Crew

8.2

Overall

7.6

Comfort

7.5

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Virgin Atlantic
7.5
Good
678 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Food

6.7

Crew

8.2

Overall

7.6

Comfort

7.5

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
United Airlines
7.4
Good
9,191 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Food

6.7

Crew

8.2

Overall

7.6

Comfort

7.5

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Lufthansa
6.8
Okay
7,738 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Food

6.7

Crew

8.2

Overall

7.6

Comfort

7.5

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
British Airways
6.7
Okay
7,689 reviews
Finnair
7.6
Good
1,353 reviews
Check prices

Food

6.7

Crew

8.2

Overall

7.6

Comfort

7.5

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

Related info for your journey

Find useful and relevant information for your journey from United Kingdom 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 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 £418, United Airlines can have you in Ontario from United Kingdom in 20h 12m. The distance from United Kingdom to Ontario is about 5430 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 Manchester - Ontario or London Gatwick - 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, September is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £238). Flying from United Kingdom to Ontario in July is currently the most expensive (average of £395). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for United Kingdom to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to Los Angeles flights
Heathrow to Las Vegas flights
Heathrow to San Francisco flights
Gatwick to Los Angeles flights
Gatwick to Las Vegas flights
London City to Las Vegas flights
London City to Los Angeles flights
Stansted to Los Angeles flights
Stansted to Las Vegas flights
Manchester to Las Vegas flights
Heathrow to Ontario flights
Gatwick to San Francisco flights
London City to San Francisco flights
Heathrow to San Diego flights
Luton to Los Angeles flights
Heathrow to Santa Ana flights
Stansted to San Francisco flights
Luton to Las Vegas flights
Heathrow to San Jose flights
Manchester to Los Angeles flights
Heathrow to Long Beach flights
Luton to San Francisco flights
Gatwick to San Diego flights
London City to San Diego flights
Manchester to Ontario flights
Gatwick to Burbank flights
Glasgow Intl to San Francisco flights
Manchester to Santa Ana flights
Stansted to San Diego flights
Heathrow to Oakland flights
Gatwick to San Jose flights
Edinburgh to San Francisco flights
Heathrow to Burbank flights
Birmingham to Los Angeles flights
Gatwick to Oakland flights
Manchester to San Francisco flights
Glasgow Intl to Los Angeles flights
Birmingham to San Francisco flights
Leeds to Los Angeles flights
Edinburgh to Las Vegas flights
Manchester to Long Beach flights
Birmingham to Las Vegas flights
Edinburgh to Los Angeles flights
Dublin to Las Vegas flights
Heathrow to Sacramento flights
Gatwick to Santa Ana flights
Glasgow Intl to Las Vegas flights
Gatwick to Ontario flights
Edinburgh to San Jose flights
Newcastle upon Tyne to Las Vegas flights

Top 6 airlines flying from United Kingdom to Ontario

Discover the top 6 airlines that operate flights from United Kingdom 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 858,174 searches. Data last updated 22 January 2026.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£279Average£438FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£369Average£522FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£372Average£513FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£375Average£500FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£394Average£615FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£423Average£579FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.