What are the cheapest airlines to fly from United Kingdom to Ontario one-way?

The cheapet airlines for a one-way flight from United Kingdom to Ontario are British Airways (£435), WestJet (£488), and Iberia (£489).

In terms of precipitation, rainfall in Ontario ranges from 3.0 - 86.0 inches per month. February is typically the wettest month, when rainfall can reach 86.0 mm. June is typically the driest time to visit Ontario when rainfall is around 3.0 mm.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 26.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 12.0 C).

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.

What are the most popular airlines that fly from United Kingdom to Ontario?

Before booking your flight from United Kingdom to Ontario check out the most popular airlines for this route: Finnair, British Airways or KLM.

How far in advance should I book a flight from United Kingdom to Ontario?

Travelers have found it’s best to book a flight 8 days in advance to save up to 32% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 8 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from United Kingdom to Ontario 1-2 weeks in advance for as low as £427, or £677 for flights within the next 24 hours.

What is the cheapest month to fly from United Kingdom to Ontario?

Flights from United Kingdom to Ontario lean towards being more expensive in August. Prices are generally better when you fly from United Kingdom to Ontario in February, with the cheapest ticket starting at £342.

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.

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.

£392+ Flights from the United Kingdom to Ontario

Cheap flight deals from United Kingdom to Ontario

Round-trip from	£392
Popular in	August
Cheapest in	February
Average price	£582

KLM
24/8-9/9
2 total stops
39h 20m total
United Kingdom to Ontario

Search Deals

Highest demand for flights based on searches. 9% potential increase in price (£38 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).

Search Deals

Average for round-trip flights in July 2025

Search Deals

Find flight deals from United Kingdom to Ontario

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 8 July 2025.

Sun 24/810:55LHR - ONT

1 stop20h 45mKLM

Tue 9/911:40ONT - LHR

1 stop18h 35mKLM

Deal found 7/7£392

Thu 28/815:05LGW - ONT

2 stops28h 27mMultiple Airlines

Wed 10/906:10ONT - LGW

2 stops18h 00mMultiple Airlines

Deal found 6/7£413

Sun 24/810:55LHR - ONT

1 stop20h 45mVirgin Atlantic

Tue 9/906:05ONT - LHR

2 stops40h 20mVirgin Atlantic

Deal found 7/7£416

Sun 31/815:10LHR - ONT

1 stop15h 04mFinnair

Sat 13/914:54ONT - LHR

1 stop13h 51mFinnair

Deal found 6/7£419

Fri 26/912:00LHR - ONT

1 stop14h 54mBritish Airways

Wed 8/1016:49ONT - LHR

1 stop12h 01mBritish Airways

Deal found 8/7£425

Mon 24/1119:05LHR - ONT

2 stops22h 23mIberia

Fri 5/1210:57ONT - LHR

1 stop15h 03mIberia

Deal found 7/7£428

Tue 25/1106:30LHR - ONT

2 stops24h 12mDelta

Fri 5/1211:29ONT - LHR

1 stop15h 31mDelta

Deal found 7/7£430

Mon 1/915:40LHR - ONT

1 stop13h 59mAmerican Airlines

Wed 17/916:45ONT - LHR

1 stop12h 05mAmerican Airlines

Deal found 8/7£443

Wed 3/912:00LHR - ONT

1 stop14h 54mMultiple Airlines

Tue 9/912:45ONT - LHR

1 stop14h 05mMultiple Airlines

Deal found 6/7£476

Wed 19/1105:55MAN - ONT

2 stops25h 51mVirgin Atlantic

Tue 2/1206:00ONT - MAN

2 stops26h 35mVirgin Atlantic

Deal found 7/7£509

Wed 5/1109:15NCL - ONT

2 stops45h 27mVirgin Atlantic

Sun 9/1112:00ONT - NCL

2 stops41h 10mVirgin Atlantic

Deal found 6/7£522

Tue 25/1112:00MAN - ONT

1 stop18h 41mDelta

Tue 2/1222:59ONT - MAN

1 stop24h 56mDelta

Deal found 7/7£524

Best flights from United Kingdom to Ontario
Discover carefully curated flight deals from United Kingdom to Ontario that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 8 July 2025.

Sun 24/810:55LHR - ONT

1 stop20h 45mKLM

Tue 9/911:40ONT - LHR

1 stop18h 35mKLM

Deal found 7/7£392

Thu 28/815:05LGW - ONT

2 stops28h 27mMultiple Airlines

Wed 10/906:10ONT - LGW

2 stops18h 00mMultiple Airlines

Deal found 6/7£413

Sun 24/810:55LHR - ONT

1 stop20h 45mVirgin Atlantic

Tue 9/906:05ONT - LHR

2 stops40h 20mVirgin Atlantic

Deal found 7/7£416

Sun 31/815:10LHR - ONT

1 stop15h 04mFinnair

Sat 13/914:54ONT - LHR

1 stop13h 51mFinnair

Deal found 6/7£419

Fri 26/912:00LHR - ONT

1 stop14h 54mBritish Airways

Wed 8/1016:49ONT - LHR

1 stop12h 01mBritish Airways

Deal found 8/7£425

Mon 24/1119:05LHR - ONT

2 stops22h 23mIberia

Fri 5/1210:57ONT - LHR

1 stop15h 03mIberia

Deal found 7/7£428

Tue 25/1106:30LHR - ONT

2 stops24h 11mDelta

Fri 5/1206:00ONT - LHR

2 stops22h 15mDelta

Deal found 7/7£430

Mon 1/915:40LHR - ONT

1 stop13h 59mAmerican Airlines

Wed 17/916:45ONT - LHR

1 stop12h 05mAmerican Airlines

Deal found 8/7£443

Sat 13/911:50MAN - ONT

2 stops18h 40mUnited Airlines

Wed 1/1007:02ONT - MAN

2 stops19h 38mUnited Airlines

Deal found 8/7£612

Sat 6/911:50MAN - ONT

2 stops16h 53mAir Canada

Wed 10/906:00ONT - MAN

2 stops20h 20mAir Canada

Deal found 7/7£687

Wed 3/912:00LHR - ONT

1 stop14h 54mMultiple Airlines

Tue 9/912:45ONT - LHR

1 stop14h 05mMultiple Airlines

Deal found 6/7£476

Wed 19/1105:55MAN - ONT

2 stops25h 51mVirgin Atlantic

Tue 2/1206:00ONT - MAN

2 stops26h 35mVirgin Atlantic

Deal found 7/7£509

Last-minute flights from United Kingdom to Ontario
Discover last-minute flight deals from United Kingdom to Ontario. Data last updated 8 July 2025 and is based on user searches.

Sun 13/715:40LHR - ONT

1 stop13h 58mAmerican Airlines

Sat 26/716:45ONT - LHR

1 stop12h 05mAmerican Airlines

Deal found 6/7£572

Mon 14/712:00LHR - ONT

1 stop14h 53mIberia

Mon 11/812:47ONT - LHR

1 stop14h 03mIberia

Deal found 7/7£507

Mon 14/714:15MAN - ONT

2 stops40h 12mAir France

Mon 21/709:44ONT - MAN

2 stops23h 11mAir France

Deal found 7/7£652

Mon 14/714:15MAN - ONT

2 stops34h 14mVirgin Atlantic

Mon 21/707:05ONT - MAN

1 stop17h 30mVirgin Atlantic

Deal found 7/7£716

Mon 14/713:40LHR - ONT

1 stop15h 57mUnited Airlines

Tue 22/713:34ONT - LHR

1 stop12h 06mUnited Airlines

Deal found 7/7£783

Tue 15/715:40LHR - ONT

1 stop13h 58mFinnair

Sun 20/723:59ONT - LHR

2 stops22h 21mFinnair

Deal found 7/7£538

Tue 15/710:55LHR - ONT

1 stop13h 34mKLM

Tue 22/713:15ONT - LHR

1 stop12h 35mKLM

Deal found 7/7£555

Tue 15/710:55LHR - ONT

1 stop13h 34mMultiple Airlines

Sat 9/813:15ONT - LHR

1 stop12h 35mMultiple Airlines

Deal found 7/7£557

Tue 15/709:00EDI - ONT

1 stop21h 27mKLM

Sun 20/711:40ONT - EDI

1 stop16h 25mKLM

Deal found 5/7£642

Tue 15/712:00LGW - ONT

2 stops19h 42mVirgin Atlantic

Tue 22/707:05ONT - LGW

2 stops18h 55mVirgin Atlantic

Deal found 7/7£844

Wed 16/711:15LHR - ONT

1 stop14h 53mBritish Airways

Sat 2/816:45ONT - LHR

1 stop13h 55mBritish Airways

Deal found 7/7£498

Wed 16/713:25LHR - ONT

1 stop17h 22mDelta

Tue 29/713:15ONT - LHR

1 stop12h 35mDelta

Deal found 7/7£532

One-way flights from United Kingdom to Ontario
Search for one-way flight options from United Kingdom to Ontario. Find affordable one-way fares based on user searches. Data last updated 8 July 2025.

Tue 28/1008:20LHR - ONT

1 stop15h 06mBritish Airways

Deal found 7/7£435

Tue 21/1014:10LHR - ONT

2 stops16h 32mWestJet

Deal found 7/7£488

Wed 17/912:00LHR - ONT

1 stop14h 54mIberia

Deal found 6/7£489

Sat 9/808:15LHR - ONT

1 stop21h 55mJetBlue

Deal found 5/7£509

Sat 13/911:15LHR - ONT

1 stop15h 01mMultiple Airlines

Deal found 8/7£519

Sat 2/806:25EDI - ONT

3 stops24h 22mMultiple Airlines

Deal found 7/7£565

Thu 21/812:05EDI - ONT

2 stops18h 37mWestJet

Deal found 7/7£580

Thu 7/811:30EDI - ONT

1 stop18h 40mJetBlue

Deal found 7/7£590

Mon 1/922:05LHR - ONT

2 stops31h 50mAvianca

Deal found 6/7£598

Fri 26/912:00LHR - ONT

1 stop14h 54mFinnair

Deal found 6/7£663

Thu 13/1106:20LHR - ONT

2 stops17h 54mVirgin Atlantic

Deal found 8/7£670

Fri 21/1119:35LGW - ONT

2 stops26h 07mBritish Airways

Deal found 6/7£677

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

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 24/8

10:55-23:40

1 stop20h 45m

Ontario

Tue 9/9

11:40-14:15

1 stop18h 35m

£392

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 28/8

15:05-11:32

2 stops28h 27m

Ontario

Wed 10/9

06:10-08:10

2 stops18h 00m

£413

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 24/8

10:55-23:40

1 stop20h 45m

Ontario

Tue 9/9

06:05-06:25

2 stops40h 20m

£416

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 31/8

15:10-22:14

1 stop15h 04m

Ontario

Sat 13/9

14:54-12:45

1 stop13h 51m

£419

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 26/9

12:00-18:54

1 stop14h 54m

Ontario

Wed 8/10

16:49-12:50

1 stop12h 01m

£425

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 24/11

19:05-09:28

2 stops22h 23m

Ontario

Fri 5/12

10:57-10:00

1 stop15h 03m

£428

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 25/11

06:30-22:41

2 stops24h 11m

Ontario

Fri 5/12

06:00-12:15

2 stops22h 15m

£430

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 1/9

15:40-21:39

1 stop13h 59m

Ontario

Wed 17/9

16:45-12:50

1 stop12h 05m

£443

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 3/9

12:00-18:54

1 stop14h 54m

Ontario

Tue 9/9

12:45-10:50

1 stop14h 05m

£476

ManchesterOntario

MAN - ONT

MANONT

Manchester

Wed 19/11

05:55-23:46

2 stops25h 51m

Ontario

Tue 2/12

06:00-16:35

2 stops26h 35m

£509

Flights are sorted by cheapest return flights first.

Deals found on 7/7

Showing 1-10 of 60 results

...

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, March is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £516). Flying from United Kingdom to Ontario in August is currently the most expensive (average of £827). 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 GB to ONT?

When flying from United Kingdom to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from the United Kingdom to Ontario, such as Delta, KLM, andFinnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,962 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very Good

7,962 reviews

Delta

8.0

Very Good

7,962 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM

7.8

Good

1,370 reviews

Delta

8.0

Very Good

7,962 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair

7.6

Good

1,311 reviews

Delta

8.0

Very Good

7,962 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines

7.4

Good

8,844 reviews

Delta

8.0

Very Good

7,962 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Virgin Atlantic

7.4

Good

652 reviews

Delta

8.0

Very Good

7,962 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.
What are the cheapest airlines to fly from United Kingdom to Ontario one-way?
The cheapet airlines for a one-way flight from United Kingdom to Ontario are British Airways (£435), WestJet (£488), and Iberia (£489).
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, March is the cheapest month in which you can book a flight from United Kingdom to Ontario (average of £516). Flying from United Kingdom to Ontario in August is currently the most expensive (average of £827). 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 United Kingdom to Ontario

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Top 6 airlines flying from United Kingdom to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Finnair	Cheapest£275	Average£423	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
British Airways	Cheapest£373	Average£532	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£373	Average£592	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£390	Average£581	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Virgin Atlantic	Cheapest£401	Average£505	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Lufthansa	Cheapest£425	Average£547	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights

Fly with Cheapflights

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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Cheap flights from the United Kingdom to Ontario from £392

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/8. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 8 July 2025.

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from United Kingdom to Ontario

Cheapest flights from United Kingdom to OntarioExplore 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 8 July 2025.

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 8 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from the United Kingdom to Ontario that are best for you.

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.

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?

What is the cheapest time of day to fly from GB to ONT?

Find hourly flight availability from United Kingdom 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 8 July 2025.

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 8 July 2025.

Read through reviews of airlines operating flights from the United Kingdom to Ontario, such as Delta, KLM, andFinnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

What are the cheapest airlines to fly from United Kingdom to Ontario one-way?

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

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

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

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

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

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.

Top 6 airlines flying from United Kingdom to Ontario

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?

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

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

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

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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 8 July 2025.