How long is the flight from United Kingdom to Ontario?

For as low as £390, British Airways can have you in Ontario from United Kingdom in 15h 07m. 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 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 Air France (£525), KLM (£525), and British Airways (£686).

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 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 56 days in advance to save up to 38% 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 56 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 £430, or £683 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 December. Prices are generally better when you fly from United Kingdom to Ontario in September, with the cheapest ticket starting at £307.

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.

£299+ Flights from the United Kingdom to Ontario

Cheap flight deals from United Kingdom to Ontario

Round-trip from	£390
One-way from	£299
Popular in	December
Cheapest in	September
Average price	£577

British Airways
10/2-24/2
2 total stops
27h 19m total
United Kingdom to Ontario

Search Deals

15/10
3 total stops
33h 05m total
United Kingdom to Ontario

Search Deals

Highest demand for flights based on searches. 3% potential increase in price (£12 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 August 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 26 August 2025.

Tue 2/917:10LHR - ONT

2 stops37h 30mVirgin Atlantic

Tue 23/909:55ONT - LHR

2 stops19h 15mVirgin Atlantic

Deal found 25/8£385

Tue 2/908:20LHR - ONT

1 stop18h 04mBritish Airways

Tue 23/912:47ONT - LHR

1 stop14h 03mBritish Airways

Deal found 25/8£394

Tue 11/1114:55LHR - ONT

1 stop15h 34mBritish Airways

Tue 18/1116:47ONT - LHR

1 stop12h 28mBritish Airways

Deal found 23/8£401

Sun 7/920:00LHR - ONT

2 stops30h 54mBritish Airways

Sun 14/923:59ONT - LHR

1 stop25h 01mBritish Airways

Deal found 24/8£403

Thu 4/911:30LHR - ONT

2 stops39h 24mBritish Airways

Thu 11/908:15ONT - LHR

1 stop20h 30mBritish Airways

Deal found 24/8£405

Thu 9/1010:55LHR - ONT

2 stops20h 44mVirgin Atlantic

Thu 16/1007:35ONT - LHR

1 stop19h 45mVirgin Atlantic

Deal found 25/8£407

Tue 9/912:00LHR - ONT

1 stop14h 54mBritish Airways

Wed 17/910:54ONT - LHR

1 stop14h 06mBritish Airways

Deal found 24/8£408

Tue 9/917:20LHR - ONT

2 stops33h 34mBritish Airways

Mon 15/908:15ONT - LHR

1 stop14h 10mBritish Airways

Deal found 24/8£409

Mon 15/912:00LHR - ONT

1 stop14h 54mAmerican Airlines

Tue 23/912:47ONT - LHR

1 stop14h 03mAmerican Airlines

Deal found 24/8£411

Fri 5/910:50LHR - ONT

2 stops40h 04mBritish Airways

Wed 10/914:54ONT - LHR

1 stop13h 51mBritish Airways

Deal found 24/8£413

Sat 1/1115:05LHR - ONT

1 stop14h 36mVirgin Atlantic

Fri 7/1113:15ONT - LHR

1 stop12h 45mVirgin Atlantic

Deal found 25/8£415

Sat 20/915:05LGW - ONT

2 stops28h 51mAmerican Airlines

Fri 3/1006:10ONT - LGW

2 stops18h 25mAmerican Airlines

Deal found 25/8£416

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 26 August 2025.

Tue 10/214:55LHR - ONT

1 stop15h 07mBritish Airways

Tue 24/217:03ONT - LHR

1 stop12h 12mBritish Airways

Deal found 25/8£390

Thu 9/1010:55LHR - ONT

2 stops20h 44mVirgin Atlantic

Thu 16/1007:35ONT - LHR

1 stop19h 45mVirgin Atlantic

Deal found 25/8£407

Sat 20/915:05LGW - ONT

2 stops28h 51mAmerican Airlines

Fri 3/1006:10ONT - LGW

2 stops18h 25mAmerican Airlines

Deal found 25/8£416

Wed 17/915:05LGW - ONT

2 stops33h 00mMultiple Airlines

Wed 24/906:10ONT - LGW

2 stops18h 00mMultiple Airlines

Deal found 25/8£444

Thu 9/1011:40LGW - ONT

2 stops20h 19mIberia

Thu 16/1012:48ONT - LGW

2 stops23h 12mIberia

Deal found 25/8£460

Thu 9/1006:00GLA - ONT

2 stops19h 10mKLM

Thu 16/1011:48ONT - GLA

2 stops20h 22mKLM

Deal found 25/8£502

Thu 9/1006:00GLA - ONT

2 stops25h 39mDelta

Thu 16/1007:05ONT - GLA

2 stops25h 05mDelta

Deal found 25/8£502

Wed 19/1112:30EDI - ONT

2 stops18h 01mUnited Airlines

Wed 3/1213:34ONT - EDI

2 stops34h 21mUnited Airlines

Deal found 25/8£570

Tue 11/1114:55LHR - ONT

1 stop15h 34mBritish Airways

Tue 18/1116:47ONT - LHR

1 stop12h 28mBritish Airways

Deal found 23/8£401

Thu 11/915:05LGW - ONT

2 stops28h 50mAmerican Airlines

Wed 24/906:10ONT - LGW

2 stops18h 00mAmerican Airlines

Deal found 23/8£420

Mon 8/919:10LHR - ONT

2 stops31h 44mBritish Airways

Mon 15/914:54ONT - LHR

1 stop13h 51mBritish Airways

Deal found 24/8£403

Sun 7/920:00LHR - ONT

2 stops30h 54mBritish Airways

Mon 15/908:15ONT - LHR

1 stop14h 10mBritish Airways

Deal found 24/8£403

Last-minute flights from United Kingdom to Ontario
Discover last-minute flight deals from United Kingdom to Ontario. Data last updated 26 August 2025 and is based on user searches.

Sat 30/808:20LHR - ONT

1 stop22h 28mBritish Airways

Thu 27/1113:31ONT - LHR

1 stop15h 44mBritish Airways

Deal found 23/8£404

Sat 30/809:40LHR - ONT

2 stops21h 00mVirgin Atlantic

Thu 27/1107:05ONT - LHR

1 stop16h 45mVirgin Atlantic

Deal found 23/8£414

Tue 2/917:10LHR - ONT

2 stops37h 30mVirgin Atlantic

Tue 23/909:55ONT - LHR

2 stops19h 15mVirgin Atlantic

Deal found 25/8£385

Tue 2/908:20LHR - ONT

1 stop18h 04mBritish Airways

Tue 23/912:47ONT - LHR

1 stop14h 03mBritish Airways

Deal found 25/8£394

Thu 4/911:30LHR - ONT

2 stops39h 24mBritish Airways

Thu 11/908:15ONT - LHR

1 stop20h 30mBritish Airways

Deal found 24/8£405

Fri 5/910:50LHR - ONT

2 stops40h 04mBritish Airways

Sun 14/923:59ONT - LHR

1 stop22h 26mBritish Airways

Deal found 24/8£413

Sun 7/920:00LHR - ONT

2 stops30h 54mBritish Airways

Sun 14/923:59ONT - LHR

1 stop25h 01mBritish Airways

Deal found 24/8£403

Tue 9/912:00LHR - ONT

1 stop14h 54mBritish Airways

Wed 17/910:54ONT - LHR

1 stop14h 06mBritish Airways

Deal found 24/8£408

Tue 9/917:20LHR - ONT

2 stops33h 34mBritish Airways

Sun 14/923:59ONT - LHR

1 stop25h 01mBritish Airways

Deal found 24/8£409

Mon 15/912:00LHR - ONT

1 stop14h 54mAmerican Airlines

Wed 24/914:54ONT - LHR

1 stop13h 51mAmerican Airlines

Deal found 24/8£411

Thu 18/910:55LHR - ONT

1 stop20h 47mVirgin Atlantic

Mon 22/913:15ONT - LHR

1 stop12h 35mVirgin Atlantic

Deal found 24/8£417

Sat 20/915:05LGW - ONT

2 stops28h 51mAmerican Airlines

Fri 3/1006:10ONT - LGW

2 stops18h 25mAmerican Airlines

Deal found 25/8£416

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 26 August 2025.

Wed 15/1020:50LGW - ONT

3 stops33h 05mMultiple Airlines

Deal found 25/8£299

Wed 8/1009:25LGW - ONT

3 stops44h 30mMultiple Airlines

Deal found 24/8£302

Wed 17/906:00EDI - ONT

3 stops34h 26mMultiple Airlines

Deal found 23/8£316

Mon 15/907:50EDI - ONT

3 stops46h 06mMultiple Airlines

Deal found 23/8£319

Mon 8/907:30EDI - ONT

3 stops46h 26mMultiple Airlines

Deal found 25/8£331

Tue 16/907:40EDI - ONT

3 stops46h 16mMultiple Airlines

Deal found 23/8£331

Sat 13/906:25EDI - ONT

3 stops32h 52mMultiple Airlines

Deal found 25/8£341

Tue 9/906:00EDI - ONT

3 stops47h 56mMultiple Airlines

Deal found 25/8£344

Thu 18/921:15EDI - ONT

3 stops54h 39mMultiple Airlines

Deal found 23/8£345

Fri 12/906:00EDI - ONT

3 stops45h 54mMultiple Airlines

Deal found 25/8£355

Thu 9/1014:00LGW - ONT

2 stops41h 50mMultiple Airlines

Deal found 25/8£359

Wed 10/917:15EDI - ONT

2 stops38h 23mMultiple Airlines

Deal found 25/8£386

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

Tue 10/2

14:55-22:02

1 stop15h 07m

Ontario

Tue 24/2

17:03-13:15

1 stop12h 12m

£390

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 11/11

14:55-22:29

1 stop15h 34m

Ontario

Tue 18/11

16:47-13:15

1 stop12h 28m

£401

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 8/9

19:10-18:54

2 stops31h 44m

Ontario

Mon 15/9

14:54-12:45

1 stop13h 51m

£403

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 7/9

20:00-18:54

2 stops30h 54m

Ontario

Mon 15/9

08:15-06:25

1 stop14h 10m

£403

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 8/9

19:10-18:54

2 stops31h 44m

Ontario

Sun 14/9

10:55-06:25

1 stop35h 30m

£403

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 7/9

20:00-18:54

2 stops30h 54m

Ontario

Sun 14/9

23:59-09:00

1 stop25h 01m

£403

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 9/10

10:55-23:39

2 stops20h 44m

Ontario

Thu 16/10

07:35-11:20

1 stop19h 45m

£407

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 9/9

12:00-18:54

1 stop14h 54m

Ontario

Wed 17/9

10:54-09:00

1 stop14h 06m

£408

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 11/11

14:55-22:29

1 stop15h 34m

Ontario

Wed 26/11

16:47-13:15

1 stop12h 28m

£409

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Sat 20/9

15:05-11:56

2 stops28h 51m

Ontario

Fri 3/10

06:10-08:35

2 stops18h 25m

£416

Flights are sorted by cheapest return flights first.

Deals found on 25/8

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 KLM, United Airlines, andVirgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

KLM

7.8

Good

1,387 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

KLM

7.8

Good

1,387 reviews

KLM

7.8

Good

1,387 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

United Airlines

7.4

Good

8,943 reviews

KLM

7.8

Good

1,387 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Virgin Atlantic

7.4

Good

658 reviews

KLM

7.8

Good

1,387 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Lufthansa

6.8

Okay

7,359 reviews

KLM

7.8

Good

1,387 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

British Airways

6.7

Okay

7,309 reviews

KLM

7.8

Good

1,387 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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 £390, British Airways can have you in Ontario from United Kingdom in 15h 07m. 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 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 Air France (£525), KLM (£525), and British Airways (£686).
What are the most popular routes from United Kingdom to Ontario?
While some choose either London Gatwick - 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£278	Average£427	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
British Airways	Cheapest£384	Average£523	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£392	Average£562	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£393	Average£639	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Virgin Atlantic	Cheapest£405	Average£507	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Lufthansa	Cheapest£429	Average£574	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 £299

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 15/10. 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 26 August 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 26 August 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 26 August 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 26 August 2025.

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from the United Kingdom to Ontario, such as KLM, United Airlines, andVirgin Atlantic. 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?

How long is the flight from United Kingdom to Ontario?

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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Travel Smart

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 26 August 2025.