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 (£436), Iberia (£463), and JetBlue (£583).

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

While some choose either Manchester - Ontario or Edinburgh Turnhouse - 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 £428, or £679 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 £343.

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.

£597+ Flights from the United Kingdom to Ontario

Cheap flight deals from United Kingdom to Ontario

Round-trip from	£356
One-way from	£347
Popular in	August
Cheapest in	February
Average price	£491

8/9-15/9
4 total stops
54h 26m total
United Kingdom to Ontario

Search Deals

9/9
2 total stops
32h 44m total
United Kingdom to Ontario

Search Deals

Highest demand for flights based on searches. 10% 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 June 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 13 June 2025.

Mon 8/915:05LGW - ONT

2 stops28h 51mMultiple Airlines

Mon 15/922:35ONT - LGW

2 stops25h 35mMultiple Airlines

Deal found 10/6£356

Tue 2/915:05LGW - ONT

2 stops28h 51mAmerican Airlines

Tue 9/916:45ONT - LGW

2 stops31h 25mAmerican Airlines

Deal found 11/6£364

Mon 1/916:25LHR - ONT

1 stop15h 42mBritish Airways

Tue 30/916:45ONT - LHR

1 stop13h 55mBritish Airways

Deal found 11/6£370

Wed 17/911:45LHR - ONT

2 stops20h 01mVirgin Atlantic

Wed 24/912:00ONT - LHR

1 stop17h 30mVirgin Atlantic

Deal found 10/6£372

Mon 8/906:30LHR - ONT

2 stops18h 41mKLM

Mon 15/909:55ONT - LHR

1 stop15h 55mKLM

Deal found 10/6£373

Tue 2/912:00LHR - ONT

1 stop14h 24mAmerican Airlines

Mon 8/914:54ONT - LHR

1 stop34h 06mAmerican Airlines

Deal found 11/6£387

Mon 18/806:30LHR - ONT

2 stops34h 25mDelta

Thu 11/911:29ONT - LHR

1 stop18h 46mDelta

Deal found 12/6£391

Wed 17/908:40LCY - ONT

2 stops23h 06mVirgin Atlantic

Wed 24/907:00ONT - LCY

2 stops18h 30mVirgin Atlantic

Deal found 10/6£423

Tue 8/710:30LHR - ONT

1 stop20h 04mFinnair

Tue 15/716:45ONT - LHR

1 stop13h 55mFinnair

Deal found 11/6£440

Wed 17/909:00EDI - ONT

2 stops22h 46mDelta

Wed 24/906:45ONT - EDI

2 stops20h 00mDelta

Deal found 11/6£450

Wed 17/909:00EDI - ONT

1 stop21h 41mKLM

Wed 24/922:59ONT - EDI

1 stop25h 01mKLM

Deal found 11/6£454

Tue 2/905:55MAN - ONT

2 stops24h 45mVirgin Atlantic

Tue 30/913:00ONT - MAN

2 stops16h 10mVirgin Atlantic

Deal found 12/6£472

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 13 June 2025.

Mon 8/915:05LGW - ONT

2 stops28h 51mMultiple Airlines

Mon 15/922:35ONT - LGW

2 stops25h 35mMultiple Airlines

Deal found 10/6£356

Tue 2/915:05LGW - ONT

2 stops28h 51mAmerican Airlines

Tue 9/916:45ONT - LGW

2 stops31h 25mAmerican Airlines

Deal found 11/6£364

Mon 1/908:20LHR - ONT

1 stop18h 04mBritish Airways

Tue 30/908:15ONT - LHR

1 stop14h 10mBritish Airways

Deal found 11/6£370

Wed 17/911:45LHR - ONT

2 stops20h 01mVirgin Atlantic

Wed 24/912:00ONT - LHR

1 stop17h 30mVirgin Atlantic

Deal found 10/6£372

Mon 8/906:30LHR - ONT

2 stops18h 41mKLM

Mon 15/909:55ONT - LHR

1 stop15h 55mKLM

Deal found 10/6£373

Mon 18/806:30LHR - ONT

2 stops34h 25mDelta

Thu 11/911:29ONT - LHR

1 stop18h 46mDelta

Deal found 12/6£391

Tue 8/710:30LHR - ONT

1 stop20h 04mFinnair

Tue 15/716:45ONT - LHR

1 stop13h 55mFinnair

Deal found 11/6£440

Mon 23/611:15LHR - ONT

1 stop14h 57mRoyal Air Maroc

Mon 7/708:15ONT - LHR

1 stop16h 45mRoyal Air Maroc

Deal found 10/6£476

Mon 22/912:05LHR - ONT

2 stops18h 25mUnited Airlines

Mon 29/913:15ONT - LHR

1 stop12h 25mUnited Airlines

Deal found 11/6£486

Thu 26/612:00LHR - ONT

1 stop15h 01mIberia

Wed 2/712:49ONT - LHR

1 stop14h 01mIberia

Deal found 10/6£489

Wed 17/909:00EDI - ONT

3 stops19h 43mAir Canada

Wed 24/918:38ONT - EDI

3 stops28h 42mAir Canada

Deal found 11/6£579

Mon 25/811:25LCY - ONT

2 stops31h 10mAlaska Airlines

Mon 1/916:50ONT - LCY

3 stops30h 25mAlaska Airlines

Deal found 10/6£701

Last-minute flights from United Kingdom to Ontario
Discover last-minute flight deals from United Kingdom to Ontario. Data last updated 13 June 2025 and is based on user searches.

Tue 17/610:55LHR - ONT

1 stop13h 33mKLM

Wed 25/613:15ONT - LHR

1 stop12h 35mKLM

Deal found 10/6£412

Tue 17/615:40LHR - ONT

1 stop13h 58mBritish Airways

Tue 24/614:40ONT - LHR

1 stop14h 05mBritish Airways

Deal found 10/6£415

Tue 17/611:45LHR - ONT

2 stops20h 01mVirgin Atlantic

Tue 24/607:05ONT - LHR

1 stop22h 25mVirgin Atlantic

Deal found 10/6£418

Wed 18/611:15MAN - ONT

2 stops20h 31mVirgin Atlantic

Mon 21/713:15ONT - MAN

2 stops15h 55mVirgin Atlantic

Deal found 11/6£497

Wed 18/611:55MAN - ONT

1 stop18h 30mDelta

Mon 21/709:44ONT - MAN

2 stops23h 11mDelta

Deal found 11/6£512

Thu 19/615:40LHR - ONT

1 stop13h 58mAmerican Airlines

Sat 5/716:45ONT - LHR

1 stop12h 05mAmerican Airlines

Deal found 10/6£493

Thu 19/609:00EDI - ONT

1 stop18h 54mKLM

Thu 26/611:49ONT - EDI

1 stop16h 16mKLM

Deal found 12/6£789

Thu 19/610:55LHR - ONT

1 stop13h 33mKLM

Mon 23/613:15ONT - LHR

1 stop12h 35mKLM

Deal found 12/6£460

Fri 20/610:40LGW - ONT

2 stops42h 58mAmerican Airlines

Sun 6/706:10ONT - LGW

2 stops42h 25mAmerican Airlines

Deal found 12/6£431

Fri 20/616:25LHR - ONT

1 stop15h 34mIberia

Tue 29/712:46ONT - LHR

1 stop14h 04mIberia

Deal found 12/6£532

Fri 20/608:15LHR - ONT

1 stop21h 44mIcelandair

Mon 7/723:59ONT - LHR

1 stop25h 31mIcelandair

Deal found 12/6£708

Sun 22/610:55LHR - ONT

1 stop13h 33mDelta

Thu 17/706:25ONT - LHR

1 stop23h 50mDelta

Deal found 11/6£487

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 13 June 2025.

Tue 9/910:00LGW - ONT

2 stops32h 44mMultiple Airlines

Deal found 12/6£347

Tue 9/906:15LHR - ONT

3 stops22h 27mMultiple Airlines

Deal found 12/6£428

Tue 16/912:00LHR - ONT

1 stop14h 54mBritish Airways

Deal found 12/6£436

Tue 1/715:10LHR - ONT

1 stop15h 01mIberia

Deal found 12/6£463

Sun 29/613:05MAN - ONT

3 stops59h 13mMultiple Airlines

Deal found 11/6£490

Tue 5/820:30EDI - ONT

2 stops27h 36mBritish Airways

Deal found 12/6£526

Sun 29/619:50MAN - ONT

2 stops31h 11mBritish Airways

Deal found 11/6£575

Mon 15/908:15LHR - ONT

1 stop21h 14mJetBlue

Deal found 11/6£583

Wed 12/1106:20LHR - ONT

2 stops17h 54mVirgin Atlantic

Deal found 11/6£622

Thu 21/808:35GLA - ONT

2 stops17h 50mBritish Airways

Deal found 11/6£636

Mon 10/1106:30LHR - ONT

2 stops24h 12mDelta

Deal found 11/6£637

Wed 18/622:05LHR - ONT

2 stops31h 50mAvianca

Deal found 12/6£646

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

Mon 8/9

15:05-11:56

2 stops28h 51m

Ontario

Mon 15/9

22:35-08:10

2 stops25h 35m

£356

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Tue 2/9

15:05-11:56

2 stops28h 51m

Ontario

Tue 9/9

16:45-08:10

2 stops31h 25m

£364

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 1/9

16:25-00:07

1 stop15h 42m

Ontario

Tue 30/9

16:45-14:40

1 stop13h 55m

£370

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 17/9

11:45-23:46

2 stops20h 01m

Ontario

Wed 24/9

12:00-13:30

1 stop17h 30m

£372

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 8/9

06:30-17:11

2 stops18h 41m

Ontario

Mon 15/9

09:55-09:50

1 stop15h 55m

£373

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 2/9

12:00-18:24

1 stop14h 24m

Ontario

Tue 9/9

16:45-12:50

1 stop12h 05m

£387

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 18/8

06:30-08:55

2 stops34h 25m

Ontario

Thu 11/9

11:29-14:15

1 stop18h 46m

£391

LondonOntario

LCY - ONT

LCYONT

London City

Wed 17/9

08:40-23:46

2 stops23h 06m

Ontario

Wed 24/9

07:00-09:30

2 stops18h 30m

£423

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 8/7

10:30-22:34

1 stop20h 04m

Ontario

Tue 15/7

16:45-14:40

1 stop13h 55m

£440

EdinburghOntario

EDI - ONT

EDIONT

Edinburgh Turnhouse

Wed 17/9

09:00-23:46

2 stops22h 46m

Ontario

Wed 24/9

06:45-10:45

2 stops20h 00m

£450

Flights are sorted by cheapest return flights first.

Deals found on 12/6

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, Alaska Airlines and KLM. 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

7,946 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

7,946 reviews

Delta

8.0

Very Good

7,946 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

Alaska Airlines

8.0

Very Good

10,000 reviews

Delta

8.0

Very Good

7,946 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

1,358 reviews

Delta

8.0

Very Good

7,946 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

1,290 reviews

Delta

8.0

Very Good

7,946 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

7.5

Good

1,463 reviews

Delta

8.0

Very Good

7,946 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 (£436), Iberia (£463), and JetBlue (£583).
What are the most popular routes from United Kingdom to Ontario?
While some choose either Manchester - Ontario or Edinburgh Turnhouse - 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£362	Average£432	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£374	Average£587	FlexibilityNo cancel fee	On-time75%	Search KLM flights
British Airways	Cheapest£381	Average£552	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£391	Average£635	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Virgin Atlantic	Cheapest£401	Average£504	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Lufthansa	Cheapest£426	Average£548	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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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.

Cheap flights from the United Kingdom to Ontario from £347

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 9/9. 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 13 June 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 13 June 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 13 June 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 13 June 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

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 13 June 2025.