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 (£429), Lufthansa (£454), and Iberia (£456).

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.

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 23% 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 £444, or £675 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 £353.

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.

£674+ Flights from the United Kingdom to Ontario - Compare & Save Big

Cheap flight deals from United Kingdom to Ontario

Round-trip from	£390
One-way from	£277
Popular in	August
Cheapest in	February
Average price	£477

18/5-24/5
4 total stops
56h 17m total
United Kingdom to Ontario

Search Deals

13/5
3 total stops
31h 08m total
United Kingdom to Ontario

Search Deals

Highest demand for flights based on searches. 9% potential increase in price (£40 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 May 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 1 May 2025.

Thu 30/1009:20LHR - ONT

1 stop17h 22mKLM

Thu 20/1111:29ONT - LHR

1 stop15h 31mKLM

Deal found 1/5£388

Sat 10/515:05LGW - ONT

2 stops28h 45mMultiple Airlines

Mon 26/523:59ONT - LGW

2 stops24h 11mMultiple Airlines

Deal found 1/5£390

Tue 13/515:05LGW - ONT

2 stops28h 45mAmerican Airlines

Sun 1/623:59ONT - LGW

2 stops24h 11mAmerican Airlines

Deal found 30/4£391

Thu 8/507:50LHR - ONT

2 stops22h 08mBritish Airways

Thu 22/506:15ONT - LHR

1 stop20h 35mBritish Airways

Deal found 30/4£404

Fri 6/613:25LHR - ONT

1 stop17h 10mVirgin Atlantic

Sun 8/611:25ONT - LHR

2 stops35h 00mVirgin Atlantic

Deal found 30/4£417

Thu 15/513:40LHR - ONT

1 stop16h 20mUnited Airlines

Thu 22/513:36ONT - LHR

1 stop12h 49mUnited Airlines

Deal found 29/4£422

Wed 10/909:15LHR - ONT

2 stops22h 21mIberia

Wed 17/912:49ONT - LHR

1 stop14h 01mIberia

Deal found 30/4£424

Wed 28/509:55LHR - ONT

2 stops20h 40mDelta

Wed 11/607:05ONT - LHR

2 stops17h 45mDelta

Deal found 30/4£427

Thu 11/908:20LHR - ONT

1 stop17h 20mFinnair

Sun 21/912:49ONT - LHR

1 stop14h 01mFinnair

Deal found 30/4£458

Mon 15/905:55NCL - ONT

2 stops23h 45mBritish Airways

Mon 6/1017:02ONT - NCL

2 stops18h 48mBritish Airways

Deal found 1/5£471

Wed 29/1012:05LHR - ONT

1 stop16h 16mLufthansa

Wed 19/1113:00ONT - LHR

1 stop12h 40mLufthansa

Deal found 30/4£477

Fri 6/608:40LCY - ONT

2 stops21h 55mDelta

Sun 8/617:08ONT - LCY

2 stops15h 32mDelta

Deal found 30/4£480

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 1 May 2025.

Sun 18/514:45LGW - ONT

2 stops31h 07mMultiple Airlines

Sat 24/522:40ONT - LGW

2 stops25h 10mMultiple Airlines

Deal found 30/4£390

Tue 13/515:05LGW - ONT

2 stops28h 45mAmerican Airlines

Sun 1/623:59ONT - LGW

2 stops24h 11mAmerican Airlines

Deal found 30/4£391

Mon 15/908:20LHR - ONT

1 stop17h 20mBritish Airways

Mon 22/917:09ONT - LHR

1 stop13h 31mBritish Airways

Deal found 30/4£404

Tue 13/510:55LHR - ONT

1 stop13h 22mKLM

Tue 5/813:15ONT - LHR

1 stop12h 35mKLM

Deal found 30/4£420

Wed 14/514:50LHR - ONT

1 stop14h 03mUnited Airlines

Tue 20/515:10ONT - LHR

1 stop15h 00mUnited Airlines

Deal found 29/4£421

Wed 10/909:15LHR - ONT

2 stops22h 21mIberia

Wed 17/912:49ONT - LHR

1 stop14h 01mIberia

Deal found 30/4£424

Wed 28/509:55LHR - ONT

2 stops20h 40mDelta

Wed 11/607:05ONT - LHR

2 stops17h 45mDelta

Deal found 30/4£427

Thu 11/908:20LHR - ONT

1 stop17h 20mFinnair

Sun 21/912:49ONT - LHR

1 stop14h 01mFinnair

Deal found 30/4£458

Mon 11/813:25LHR - ONT

1 stop17h 16mVirgin Atlantic

Tue 30/911:29ONT - LHR

1 stop15h 51mVirgin Atlantic

Deal found 30/4£463

Thu 29/514:50LHR - ONT

1 stop14h 14mLufthansa

Thu 19/613:33ONT - LHR

1 stop12h 07mLufthansa

Deal found 1/5£539

Mon 8/911:20LHR - ONT

1 stop19h 21mAir France

Sun 28/922:59ONT - LHR

1 stop28h 11mAir France

Deal found 30/4£566

Mon 30/609:30LHR - ONT

2 stops39h 55mAir Canada

Sun 13/718:28ONT - LHR

2 stops55h 32mAir Canada

Deal found 30/4£575

Last-minute flights from United Kingdom to Ontario
Discover last-minute flight deals from United Kingdom to Ontario. Data last updated 1 May 2025 and is based on user searches.

Tue 6/513:05MAN - ONT

2 stops18h 53mMultiple Airlines

Tue 13/508:55ONT - MAN

2 stops18h 45mMultiple Airlines

Deal found 29/4£3,618

Wed 7/510:35LHR - ONT

1 stop15h 26mUnited Airlines

Sun 25/513:33ONT - LHR

1 stop12h 07mUnited Airlines

Deal found 30/4£490

Wed 7/509:00EDI - ONT

1 stop21h 29mKLM

Tue 13/507:05ONT - EDI

1 stop21h 00mKLM

Deal found 30/4£596

Thu 8/507:50LHR - ONT

2 stops22h 08mBritish Airways

Thu 22/506:15ONT - LHR

1 stop20h 35mBritish Airways

Deal found 30/4£404

Thu 8/510:55LHR - ONT

1 stop13h 22mKLM

Mon 12/513:10ONT - LHR

1 stop12h 40mKLM

Deal found 30/4£419

Thu 8/508:15LHR - ONT

1 stop20h 56mJetBlue

Thu 15/522:59ONT - LHR

1 stop13h 46mJetBlue

Deal found 30/4£710

Thu 8/511:55LHR - ONT

1 stop17h 16mIcelandair

Thu 15/522:59ONT - LHR

1 stop26h 31mIcelandair

Deal found 30/4£724

Thu 8/506:10LHR - ONT

2 stops23h 48mIberia

Thu 22/510:53ONT - LHR

2 stops16h 57mIberia

Deal found 30/4£2,103

Thu 8/511:15LHR - ONT

1 stop15h 08mAmerican Airlines

Sun 11/516:35ONT - LHR

1 stop12h 15mAmerican Airlines

Deal found 1/5£391

Thu 8/511:15LHR - ONT

1 stop15h 08mBritish Airways

Tue 13/514:44ONT - LHR

1 stop15h 41mBritish Airways

Deal found 1/5£403

Fri 9/511:20LHR - ONT

1 stop16h 13mKLM

Tue 20/513:10ONT - LHR

1 stop12h 40mKLM

Deal found 1/5£396

Sat 10/515:05LGW - ONT

2 stops28h 45mMultiple Airlines

Mon 26/523:59ONT - LGW

2 stops24h 11mMultiple Airlines

Deal found 1/5£390

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 1 May 2025.

Tue 13/513:00LGW - ONT

3 stops31h 08mMultiple Airlines

Deal found 29/4£277

Tue 5/811:30EDI - ONT

3 stops42h 22mMultiple Airlines

Deal found 30/4£364

Tue 13/514:10LHR - ONT

2 stops29h 58mMultiple Airlines

Deal found 29/4£369

Fri 6/615:40LHR - ONT

1 stop13h 58mBritish Airways

Deal found 30/4£429

Fri 29/808:55LCY - ONT

2 stops20h 30mLufthansa

Deal found 30/4£454

Wed 17/910:30LHR - ONT

1 stop19h 26mIberia

Deal found 30/4£456

Fri 29/816:30LHR - ONT

2 stops36h 55mLufthansa

Deal found 30/4£462

Tue 13/510:55LHR - ONT

1 stop13h 22mAir France

Deal found 30/4£501

Wed 14/508:15LHR - ONT

1 stop20h 56mJetBlue

Deal found 30/4£589

Wed 17/910:40LGW - ONT

2 stops19h 16mFinnair

Deal found 30/4£626

Tue 9/908:25LHR - ONT

2 stops21h 16mIcelandair

Deal found 30/4£638

Sat 30/808:40LCY - ONT

2 stops22h 01mVirgin Atlantic

Deal found 1/5£671

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

LGW - ONT

LGWONT

London Gatwick

Sun 18/5

14:45-13:52

2 stops31h 07m

Ontario

Sat 24/5

22:40-07:50

2 stops25h 10m

£390

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Tue 13/5

15:05-11:50

2 stops28h 45m

Ontario

Sun 1/6

23:59-08:10

2 stops24h 11m

£391

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 15/9

08:20-17:40

1 stop17h 20m

Ontario

Mon 22/9

17:09-14:40

1 stop13h 31m

£404

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 13/5

10:55-16:17

1 stop13h 22m

Ontario

Tue 5/8

13:15-09:50

1 stop12h 35m

£420

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 14/5

14:50-20:53

1 stop14h 03m

Ontario

Tue 20/5

15:10-14:10

1 stop15h 00m

£421

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 10/9

09:15-23:36

2 stops22h 21m

Ontario

Wed 17/9

12:49-10:50

1 stop14h 01m

£424

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 28/5

09:55-22:35

2 stops20h 40m

Ontario

Wed 11/6

07:05-08:50

2 stops17h 45m

£427

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 11/9

08:20-17:40

1 stop17h 20m

Ontario

Sun 21/9

12:49-10:50

1 stop14h 01m

£458

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 11/8

13:25-22:41

1 stop17h 16m

Ontario

Tue 30/9

11:29-11:20

1 stop15h 51m

£463

Newcastle upon TyneOntario

NCL - ONT

NCLONT

Newcastle upon Tyne

Mon 15/9

05:55-21:40

2 stops23h 45m

Ontario

Mon 6/10

17:02-19:50

2 stops18h 48m

£471

Flights are sorted by cheapest return flights first.

Deals found on 29/4

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.

Rainfall in Ontario by month

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.

Temperature in Ontario by month

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).

Reviews of airlines servicing Ontario

To help decide which airline to fly from United Kingdom to Ontario, see what other customers have to say about Delta, KLM and Finnair. 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.

Delta

8.0

Very Good

7,934 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

7,934 reviews

Delta

8.0

Very Good

7,934 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

1,334 reviews

Delta

8.0

Very Good

7,934 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

1,275 reviews

Delta

8.0

Very Good

7,934 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

Air France

7.4

Good

1,446 reviews

Delta

8.0

Very Good

7,934 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

8,696 reviews

Delta

8.0

Very Good

7,934 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 (£429), Lufthansa (£454), and Iberia (£456).
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, 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£370	Average£498	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£380	Average£630	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£397	Average£592	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Virgin Atlantic	Cheapest£409	Average£510	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£409	Average£556	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Lufthansa	Cheapest£442	Average£534	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 £277

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 13/5. 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 1 May 2025.

Round-trip from

One-way 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 1 May 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 1 May 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 1 May 2025.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

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 1 May 2025.

To help decide which airline to fly from United Kingdom to Ontario, see what other customers have to say about Delta, KLM and Finnair. 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.

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 1 May 2025.