How long is the flight from Ontario to London?

Airlines like Delta, British Airways, and Iberia fly from Ontario to London in about 13h 49m. The time it takes to get you to your destination can typically vary by up to 10h 11m. The distance between Ontario and London is about 5407 mi. This flight may include one or multiple stops.

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

£276 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on Iberia and KLM, with prices starting from £280 and £280, respectively.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What are the most popular routes from Ontario to London?

When deciding which route to take from Ontario to London consider Ontario - London Heathrow, Ontario - London Gatwick or Ontario - London City as they are the most popular.

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

To save up to 18% on this flight, we recommend booking at least 32 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ontario to London from £508 1-2 weeks out and tickets from £671 for flights departing within the next 72 hours.

What is the cheapest month to fly from Ontario to London?

Flights from Ontario to London lean towards being more expensive in December. Prices are generally better when you fly from Ontario to London in August, with the cheapest ticket starting at £337.

What airport do you fly from for flights from Ontario to London?

Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to London. 0 airlines have flights from Ontario to London on a regular basis. Booking flights from Ontario to London should not be difficult; the airport handles an average of 0 outbound flights to London per day.

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

Yes. In addition to deals on Ontario to London flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Ontario to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to London.

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

Yes. Cheapflights offers flight deals from Ontario to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£174+ Flights from Ontario to London

Cheap flight deals from Ontario to London

Round-trip from	£419
One-way from	£174
Popular in	December
Cheapest in	September
Average price	£492

Virgin Atlantic
8/12-16/1
2 total stops
40h 28m total
Ontario to London

Search Deals

16/10
2 total stops
37h 28m total
Ontario to London

Search Deals

Highest demand for flights based on searches. 3% potential increase in price (£17 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Find flight deals from Ontario to London

Cheapest flights from Ontario to London
Explore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Mon 8/1206:40ONT - LHR

1 stop22h 10mVirgin Atlantic

Fri 16/112:20LHR - ONT

1 stop18h 18mVirgin Atlantic

Deal found 10/9£419

Tue 23/906:10ONT - LHR

1 stop16h 15mBritish Airways

Tue 21/1008:20LHR - ONT

1 stop16h 08mBritish Airways

Deal found 9/9£433

Sun 21/916:45ONT - LHR

1 stop12h 05mAmerican Airlines

Tue 7/1012:00LHR - ONT

1 stop14h 52mAmerican Airlines

Deal found 11/9£436

Wed 24/907:05ONT - LHR

1 stop16h 10mDelta

Wed 1/1009:00LHR - ONT

2 stops21h 40mDelta

Deal found 11/9£439

Wed 1/1013:15ONT - LHR

1 stop12h 35mDelta

Thu 30/1006:20LHR - ONT

2 stops23h 21mDelta

Deal found 11/9£439

Tue 14/1011:36ONT - LHR

2 stops16h 29mVirgin Atlantic

Wed 22/1011:45LHR - ONT

2 stops19h 54mVirgin Atlantic

Deal found 11/9£443

Wed 22/1016:49ONT - LHR

1 stop12h 01mBritish Airways

Tue 28/1015:00LHR - ONT

1 stop14h 42mBritish Airways

Deal found 10/9£444

Wed 15/1013:15ONT - LHR

1 stop12h 35mDelta

Wed 22/1013:25LHR - ONT

1 stop17h 16mDelta

Deal found 11/9£444

Mon 22/916:45ONT - LHR

1 stop13h 55mBritish Airways

Fri 3/1011:15LHR - ONT

1 stop15h 01mBritish Airways

Deal found 11/9£447

Wed 1/1016:40ONT - LCY

2 stops16h 00mDelta

Fri 10/1010:00LCY - ONT

2 stops20h 41mDelta

Deal found 11/9£482

Tue 14/1007:02ONT - LCY

2 stops21h 28mMultiple Airlines

Wed 22/1009:25LCY - ONT

2 stops21h 27mMultiple Airlines

Deal found 10/9£522

Wed 22/1007:02ONT - LCY

2 stops21h 28mMultiple Airlines

Wed 29/1009:50LCY - ONT

2 stops20h 01mMultiple Airlines

Deal found 10/9£527

Best flights from Ontario to London
Discover carefully curated flight deals from Ontario to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 September 2025.

Mon 8/1222:25ONT - LHR

1 stop24h 00mDelta

Fri 16/106:20LHR - ONT

2 stops24h 18mDelta

Deal found 10/9£439

Mon 27/1014:51ONT - LHR

1 stop13h 49mBritish Airways

Fri 7/1109:55LHR - ONT

1 stop17h 46mBritish Airways

Deal found 10/9£444

Wed 24/914:54ONT - LHR

1 stop15h 31mIberia

Wed 1/1008:20LHR - ONT

1 stop22h 13mIberia

Deal found 12/9£444

Wed 5/1111:36ONT - LHR

1 stop13h 24mKLM

Tue 13/110:45LHR - ONT

1 stop13h 34mKLM

Deal found 11/9£444

Wed 14/115:00ONT - LHR

1 stop13h 15mMultiple Airlines

Mon 19/110:15LHR - ONT

1 stop19h 47mMultiple Airlines

Deal found 10/9£481

Wed 4/306:47ONT - LGW

2 stops18h 13mAmerican Airlines

Sun 8/312:30LGW - ONT

2 stops36h 19mAmerican Airlines

Deal found 10/9£601

Wed 22/1007:05ONT - LHR

1 stop15h 40mDelta

Wed 29/1006:20LHR - ONT

2 stops22h 00mDelta

Deal found 10/9£439

Wed 1/1010:54ONT - LHR

1 stop15h 56mBritish Airways

Fri 10/1016:25LHR - ONT

1 stop15h 34mBritish Airways

Deal found 11/9£444

Wed 1/1009:55ONT - LHR

1 stop15h 55mDelta

Fri 10/1006:15LHR - ONT

2 stops18h 55mDelta

Deal found 11/9£439

Tue 14/1007:02ONT - LCY

2 stops21h 28mMultiple Airlines

Wed 22/1009:25LCY - ONT

2 stops21h 27mMultiple Airlines

Deal found 10/9£522

Mon 22/911:50ONT - LHR

1 stop18h 25mDelta

Thu 2/1011:20LHR - ONT

1 stop15h 55mDelta

Deal found 10/9£444

Wed 22/1007:02ONT - LCY

2 stops21h 28mMultiple Airlines

Wed 29/1009:50LCY - ONT

2 stops20h 01mMultiple Airlines

Deal found 10/9£527

Last-minute flights from Ontario to London
Discover last-minute flight deals from Ontario to London. Data last updated 12 September 2025 and is based on user searches.

Sat 20/917:40ONT - LHR

2 stops28h 45mDelta

Tue 30/911:20LHR - ONT

1 stop15h 55mDelta

Deal found 10/9£447

Sun 21/916:45ONT - LHR

1 stop12h 05mAmerican Airlines

Tue 7/1012:00LHR - ONT

1 stop14h 52mAmerican Airlines

Deal found 11/9£436

Mon 22/916:45ONT - LHR

1 stop13h 55mBritish Airways

Fri 3/1011:15LHR - ONT

1 stop15h 01mBritish Airways

Deal found 11/9£447

Tue 23/906:10ONT - LHR

1 stop16h 15mBritish Airways

Tue 21/1008:20LHR - ONT

1 stop16h 08mBritish Airways

Deal found 9/9£433

Wed 24/907:05ONT - LHR

1 stop16h 10mDelta

Wed 1/1009:00LHR - ONT

2 stops21h 40mDelta

Deal found 11/9£439

Wed 1/1013:15ONT - LHR

1 stop12h 35mDelta

Thu 30/1006:20LHR - ONT

2 stops23h 21mDelta

Deal found 11/9£439

Wed 1/1016:40ONT - LCY

2 stops16h 00mDelta

Fri 10/1010:00LCY - ONT

2 stops20h 41mDelta

Deal found 11/9£482

Tue 14/1011:36ONT - LHR

2 stops16h 29mVirgin Atlantic

Wed 22/1011:45LHR - ONT

2 stops19h 54mVirgin Atlantic

Deal found 11/9£443

Tue 14/1007:02ONT - LCY

2 stops21h 28mMultiple Airlines

Wed 22/1009:25LCY - ONT

2 stops21h 27mMultiple Airlines

Deal found 10/9£522

Wed 15/1013:15ONT - LHR

1 stop12h 35mDelta

Wed 22/1013:25LHR - ONT

1 stop17h 16mDelta

Deal found 11/9£444

Wed 22/1016:49ONT - LHR

1 stop12h 01mBritish Airways

Tue 28/1015:00LHR - ONT

1 stop14h 42mBritish Airways

Deal found 10/9£444

Wed 22/1007:02ONT - LCY

2 stops21h 28mMultiple Airlines

Wed 29/1009:50LCY - ONT

2 stops20h 01mMultiple Airlines

Deal found 10/9£527

One-way flights from Ontario to London
Search for one-way flight options from Ontario to London. Find affordable one-way fares based on user searches. Data last updated 12 September 2025.

Thu 16/1012:32ONT - LGW

2 stops37h 28mMultiple Airlines

Deal found 10/9£174

Tue 23/908:00ONT - LGW

2 stops38h 20mMultiple Airlines

Deal found 11/9£182

Sat 25/1008:34ONT - LGW

2 stops38h 26mMultiple Airlines

Deal found 10/9£213

Sat 18/1013:37ONT - LHR

3 stops48h 23mMultiple Airlines

Deal found 10/9£213

Thu 16/1012:32ONT - LHR

3 stops45h 13mMultiple Airlines

Deal found 10/9£216

Thu 27/1115:31ONT - LHR

3 stops37h 19mMultiple Airlines

Deal found 10/9£245

Fri 28/1121:59ONT - LHR

2 stops35h 31mMultiple Airlines

Deal found 10/9£246

Sat 25/1013:37ONT - LHR

3 stops40h 13mMultiple Airlines

Deal found 10/9£248

Sun 19/1022:56ONT - LHR

1 stop13h 49mJetBlue

Deal found 11/9£250

Mon 13/1016:49ONT - LHR

1 stop12h 01mBritish Airways

Deal found 11/9£275

Tue 21/1016:49ONT - LHR

1 stop12h 01mBritish Airways

Deal found 10/9£275

Mon 20/1022:56ONT - LHR

1 stop13h 49mJetBlue

Deal found 11/9£276

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 8/12

22:25-06:25

1 stop24h 00m

London Heathrow

Fri 16/1

06:20-22:38

2 stops24h 18m

£439

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 22/10

07:05-06:45

1 stop15h 40m

London Heathrow

Wed 29/10

06:20-21:20

2 stops22h 00m

£439

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/10

09:55-09:50

1 stop15h 55m

London Heathrow

Fri 10/10

06:15-17:10

2 stops18h 55m

£439

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 27/10

14:51-11:40

1 stop13h 49m

London Heathrow

Fri 7/11

09:55-19:41

1 stop17h 46m

£444

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 24/9

14:54-14:25

1 stop15h 31m

London Heathrow

Wed 1/10

08:20-22:33

1 stop22h 13m

£444

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 5/11

11:36-09:00

1 stop13h 24m

London Heathrow

Tue 13/1

10:45-16:19

1 stop13h 34m

£444

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/10

10:54-10:50

1 stop15h 56m

London Heathrow

Fri 10/10

16:25-23:59

1 stop15h 34m

£444

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 22/9

11:50-14:15

1 stop18h 25m

London Heathrow

Thu 2/10

11:20-19:15

1 stop15h 55m

£444

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 23/9

11:55-13:30

1 stop17h 35m

London Heathrow

Wed 1/10

11:20-19:15

1 stop15h 55m

£444

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 23/9

09:55-09:50

1 stop15h 55m

London Heathrow

Tue 30/9

20:25-10:42

2 stops22h 17m

£447

Flights are sorted by cheapest return flights first.

Deals found on 10/9

Showing 1-10 of 60 results

...

Best time to book a flight from Ontario to London

Have a flexible travel schedule? Discover the best time to fly to London from Ontario 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 Ontario to London

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

Currently, January is the cheapest month in which you can book a flight from Ontario to London (average of £112). Flying from Ontario to London in August is currently the most expensive (average of £164). 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 ONT to LON?

One of the essential ways to save on airfare from Ontario to London is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at midday could potentially save you up to 18% on airfare.

What’s the top stopover airport for flights from Ontario to London?

Dallas (DFW) – chosen by Cheapflights users on 67% of one-stop itineraries from Ontario to London on Cheapflights.

What’s the cheapest stopover airport for flights from Ontario to London?

Phoenix (PHX) is the most affordable one-stop option, with an average return flight price of £468.

What’s the fastest stopover option from Ontario to London?

Flights via Phoenix (PHX) have the shortest average one-way travel time for one-stop routes: 12h 15m.

Which airport typically offers the quickest stopover for flights from Ontario to London?

Flights via Phoenix (PHX) offer the fastest connection on this route, with an average stopover time of 1h 28m.

Related info for your journey

What airport do you fly from for flights from Ontario to London?
Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to London. 0 airlines have flights from Ontario to London on a regular basis. Booking flights from Ontario to London should not be difficult; the airport handles an average of 0 outbound flights to London per day.
How long is the flight from Ontario to London?
Airlines like Delta, British Airways, and Iberia fly from Ontario to London in about 13h 49m. The time it takes to get you to your destination can typically vary by up to 10h 11m. The distance between Ontario and London is about 5407 mi. This flight may include one or multiple stops.
What are the cheapest airlines to fly from Ontario to London one-way?
£276 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on Iberia and KLM, with prices starting from £280 and £280, respectively.
What are the most popular routes from Ontario to London?
When deciding which route to take from Ontario to London consider Ontario - London Heathrow, Ontario - London Gatwick or Ontario - London City as they are the most popular.
Can I find deals for flights from Ontario to London that include hotel bookings?
Yes. In addition to deals on Ontario to London flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Ontario to London?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to London.
Can I find deals for business class flights from Ontario to London?
Yes. Cheapflights offers flight deals from Ontario to London 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 Ontario to London?
Currently, January is the cheapest month in which you can book a flight from Ontario to London (average of £112). Flying from Ontario to London in August is currently the most expensive (average of £164). 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.

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Gatwick

Slough

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Wembley

Ilford

Crawley

Hayes

Watford

Folkestone

Winchester

Chichester

Ipswich

Dartford

Eastbourne

Guildford

Bishop's Stortford

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How does Cheapflights help users find flights from Ontario to London?

Cheapflights helps you search for flights from Ontario to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Ontario to London for you. Better yet — we are completely free to use.

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

Yes! Cheapflights helps users easily find flights from Ontario to London with no change fees.

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

Yes! Start tracking prices for Ontario to London flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from Ontario to London from £174

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 16/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Ontario to London

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to London

Cheapest flights from Ontario to LondonExplore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Explore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Ontario to London

Have a flexible travel schedule? Discover the best time to fly to London from Ontario with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Ontario to London

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

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

Find hourly flight availability from Ontario to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 September 2025.

What’s the top stopover airport for flights from Ontario to London?

Share of one-stop return flights from Ontario to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

What’s the cheapest stopover airport for flights from Ontario to London?

Average return fare for one-stop flights from Ontario to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

What’s the fastest stopover option from Ontario to London?

Shortest average travel time for one-stop one-way flights from Ontario to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Which airport typically offers the quickest stopover for flights from Ontario to London?

Average stopover duration for one-stop one-way flights from Ontario to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Related info for your journey

Find useful and relevant information for your journey from Ontario to London. 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 from for flights from Ontario to London?

How long is the flight from Ontario to London?

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

What are the most popular routes from Ontario to London?

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

How can I find direct flights from Ontario to London?

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

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

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Alternative routes for Ontario to London

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How does Cheapflights help users find flights from Ontario to London?

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

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

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

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Cheapest flights from Ontario to London
Explore the most affordable flight options available from Ontario to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 September 2025.