What are the cheapest airlines flying from Ontario to London round-trip?

Iberia, at £455, was found to be the cheapest airline from Ontario to London.Alternate airlines flying return to your destination include Virgin Atlantic and Delta. Users have found that Iberia is 22% cheaper than the other options available to this destination.

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

£277 is the cheapest one-way deal found within the past few days, from Virgin Atlantic. You may also be able to find cheap deals on Iberia and JetBlue, with prices starting from £291 and £298, 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.

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

To save up to 44% on this flight, we recommend booking at least 56 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 £549 1-2 weeks out and tickets from £734 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 October, with the cheapest ticket starting at £333.

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.

£210+ Flights from Ontario to London

Cheap flight deals from Ontario to London

Round-trip from	£455
One-way from	£210
Popular in	June
Cheapest in	October
Average price	£565

Iberia
30/4-6/5
2 total stops
37h 48m total
Ontario to London

Search Deals

29/7
2 total stops
17h 52m total
Ontario to London

Search Deals

Highest demand for flights based on searches. 11% potential increase in price (£60 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£18 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 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 16 April 2025.

Wed 30/407:00ONT - LHR

1 stop19h 50mIberia

Tue 6/512:00LHR - ONT

1 stop17h 58mIberia

Deal found 15/4£455

Fri 25/413:20ONT - LHR

1 stop12h 30mKLM

Thu 8/511:20LHR - ONT

1 stop16h 13mKLM

Deal found 15/4£468

Mon 28/416:35ONT - LHR

1 stop14h 05mMultiple Airlines

Sun 4/515:40LHR - ONT

1 stop14h 18mMultiple Airlines

Deal found 15/4£476

Wed 30/411:45ONT - LHR

1 stop15h 35mVirgin Atlantic

Wed 7/506:15LHR - ONT

2 stops18h 02mVirgin Atlantic

Deal found 15/4£477

Mon 28/406:00ONT - LHR

1 stop19h 50mDelta

Sun 4/506:30LHR - ONT

2 stops18h 03mDelta

Deal found 15/4£478

Sat 10/510:00ONT - LHR

1 stop18h 50mBritish Airways

Sat 17/508:20LHR - ONT

1 stop18h 16mBritish Airways

Deal found 15/4£480

Thu 11/906:00ONT - LHR

1 stop17h 25mUnited Airlines

Sat 20/914:05LHR - ONT

2 stops35h 24mUnited Airlines

Deal found 15/4£504

Sat 1/1113:00ONT - LHR

2 stops15h 50mAir Canada

Sat 15/1114:30LHR - ONT

2 stops37h 47mAir Canada

Deal found 14/4£506

Fri 2/516:35ONT - LHR

1 stop12h 15mAmerican Airlines

Fri 16/515:40LHR - ONT

1 stop14h 17mAmerican Airlines

Deal found 14/4£524

Tue 23/923:00ONT - LHR

1 stop13h 45mIcelandair

Tue 21/1008:15LHR - ONT

1 stop21h 26mIcelandair

Deal found 15/4£560

Thu 1/522:40ONT - LHR

1 stop14h 05mJetBlue

Wed 7/511:55LHR - ONT

1 stop17h 16mJetBlue

Deal found 14/4£562

Wed 10/907:00ONT - LCY

2 stops21h 30mMultiple Airlines

Sat 20/912:15LCY - ONT

2 stops42h 38mMultiple Airlines

Deal found 15/4£589

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 16 April 2025.

Wed 30/407:00ONT - LHR

1 stop19h 50mIberia

Tue 6/512:00LHR - ONT

1 stop17h 58mIberia

Deal found 15/4£455

Mon 28/416:35ONT - LHR

1 stop14h 05mMultiple Airlines

Sun 4/515:40LHR - ONT

1 stop14h 18mMultiple Airlines

Deal found 15/4£476

Wed 30/411:45ONT - LHR

1 stop15h 35mVirgin Atlantic

Wed 7/506:15LHR - ONT

2 stops18h 02mVirgin Atlantic

Deal found 15/4£477

Mon 28/414:35ONT - LHR

1 stop15h 40mDelta

Mon 5/506:30LHR - ONT

2 stops18h 14mDelta

Deal found 15/4£478

Sat 10/510:00ONT - LHR

1 stop18h 50mBritish Airways

Sat 17/508:20LHR - ONT

1 stop18h 16mBritish Airways

Deal found 15/4£480

Thu 11/906:00ONT - LHR

1 stop17h 25mUnited Airlines

Sat 20/914:05LHR - ONT

2 stops35h 24mUnited Airlines

Deal found 15/4£504

Fri 2/516:35ONT - LHR

1 stop12h 15mAmerican Airlines

Fri 16/515:40LHR - ONT

1 stop14h 17mAmerican Airlines

Deal found 14/4£524

Sun 11/512:18ONT - LHR

1 stop14h 52mKLM

Sat 24/510:55LHR - ONT

1 stop13h 22mKLM

Deal found 14/4£554

Tue 23/923:00ONT - LHR

1 stop13h 45mIcelandair

Tue 21/1008:15LHR - ONT

1 stop21h 26mIcelandair

Deal found 15/4£560

Thu 1/522:40ONT - LHR

1 stop14h 05mJetBlue

Fri 9/508:15LHR - ONT

1 stop20h 56mJetBlue

Deal found 14/4£562

Wed 10/907:00ONT - LCY

2 stops21h 30mMultiple Airlines

Sat 20/912:15LCY - ONT

2 stops42h 38mMultiple Airlines

Deal found 15/4£589

Wed 10/915:00ONT - LGW

2 stops21h 00mIberia

Fri 19/911:35LGW - ONT

2 stops20h 01mIberia

Deal found 14/4£637

Last-minute flights from Ontario to London
Discover last-minute flight deals from Ontario to London. Data last updated 16 April 2025 and is based on user searches.

Mon 21/413:35ONT - LHR

1 stop14h 45mUnited Airlines

Thu 1/514:50LHR - ONT

1 stop14h 03mUnited Airlines

Deal found 15/4£745

Mon 21/416:35ONT - LHR

1 stop14h 05mBritish Airways

Mon 28/415:10LHR - ONT

1 stop15h 00mBritish Airways

Deal found 15/4£778

Thu 24/423:25ONT - LHR

2 stops32h 10mAvianca

Mon 28/422:05LHR - ONT

2 stops31h 50mAvianca

Deal found 15/4£2,108

Thu 24/400:10ONT - LHR

1 stop32h 20mChina Airlines

Wed 30/421:10LHR - ONT

1 stop28h 50mChina Airlines

Deal found 16/4£9,649

Fri 25/405:00ONT - LHR

2 stops17h 30mMultiple Airlines

Mon 28/408:30LHR - ONT

2 stops20h 12mMultiple Airlines

Deal found 15/4£846

Fri 25/411:45ONT - LHR

1 stop18h 30mVirgin Atlantic

Wed 30/411:45LHR - ONT

2 stops19h 56mVirgin Atlantic

Deal found 16/4£1,287

Fri 25/405:00ONT - LCY

3 stops22h 40mMultiple Airlines

Wed 30/408:45LCY - ONT

2 stops35h 39mMultiple Airlines

Deal found 16/4£2,719

Fri 25/418:24ONT - LGW

2 stops36h 06mMultiple Airlines

Wed 30/411:35LGW - ONT

2 stops20h 15mMultiple Airlines

Deal found 16/4£4,151

Fri 25/407:00ONT - LHR

1 stop15h 45mDelta

Thu 15/513:05LHR - ONT

1 stop17h 24mDelta

Deal found 15/4£4,463

Fri 25/412:50ONT - LHR

1 stop17h 35mIberia

Tue 13/506:10LHR - ONT

2 stops25h 33mIberia

Deal found 15/4£4,467

Fri 25/413:20ONT - LHR

1 stop12h 30mKLM

Sat 17/510:55LHR - ONT

1 stop13h 22mKLM

Deal found 15/4£7,179

Fri 25/413:20ONT - LHR

1 stop12h 30mKLM

Thu 8/511:20LHR - ONT

1 stop16h 13mKLM

Deal found 15/4£468

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 16 April 2025.

Tue 29/710:03ONT - LHR

2 stops17h 52mMultiple Airlines

Deal found 16/4£210

Sat 26/412:07ONT - LHR

1 stop15h 03mVirgin Atlantic

Deal found 15/4£277

Mon 8/915:00ONT - LGW

2 stops31h 20mMultiple Airlines

Deal found 15/4£285

Fri 25/407:00ONT - LHR

1 stop18h 00mIberia

Deal found 16/4£291

Fri 3/1023:00ONT - LHR

1 stop13h 45mJetBlue

Deal found 15/4£298

Mon 28/406:10ONT - LHR

1 stop21h 25mUnited Airlines

Deal found 14/4£303

Thu 1/505:05ONT - LHR

2 stops17h 30mAir Canada

Deal found 14/4£307

Tue 22/414:44ONT - LHR

1 stop14h 01mBritish Airways

Deal found 15/4£309

Fri 9/523:59ONT - LCY

2 stops34h 26mBritish Airways

Deal found 15/4£326

Mon 8/907:00ONT - LCY

2 stops21h 30mUnited Airlines

Deal found 15/4£329

Sun 27/413:20ONT - LCY

2 stops19h 20mDelta

Deal found 15/4£333

Sun 20/707:00ONT - LGW

2 stops19h 00mKLM

Deal found 14/4£343

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 30/4

07:00-10:50

1 stop19h 50m

London Heathrow

Tue 6/5

12:00-21:58

1 stop17h 58m

£455

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 28/4

16:35-14:40

1 stop14h 05m

London Heathrow

Sun 4/5

15:40-21:58

1 stop14h 18m

£476

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 30/4

11:45-11:20

1 stop15h 35m

London Heathrow

Wed 7/5

06:15-16:17

2 stops18h 02m

£477

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 28/4

14:35-14:15

1 stop15h 40m

London Heathrow

Mon 5/5

06:30-16:44

2 stops18h 14m

£478

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 10/5

10:00-12:50

1 stop18h 50m

London Heathrow

Sat 17/5

08:20-18:36

1 stop18h 16m

£480

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 11/9

06:00-07:25

1 stop17h 25m

London Heathrow

Sat 20/9

14:05-17:29

2 stops35h 24m

£504

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 2/5

16:35-12:50

1 stop12h 15m

London Heathrow

Fri 16/5

15:40-21:57

1 stop14h 17m

£524

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 11/5

12:18-11:10

1 stop14h 52m

London Heathrow

Sat 24/5

10:55-16:17

1 stop13h 22m

£554

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 23/9

23:00-20:45

1 stop13h 45m

London Heathrow

Tue 21/10

08:15-21:41

1 stop21h 26m

£560

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/5

22:40-20:45

1 stop14h 05m

London Heathrow

Fri 9/5

08:15-21:11

1 stop20h 56m

£562

Flights are sorted by cheapest return flights first.

Deals found on 16/4

Showing 1-10 of 42 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

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

Booking 20 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 19% on airfare.

Rainfall in London by month

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.

Temperature in London by month

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).

Reviews of airlines servicing London

Get a feel of what it's like to fly with Delta, KLM and Finnair from Ontario to London by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,918 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very Good

7,918 reviews

Delta

8.0

Very Good

7,918 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,323 reviews

Delta

8.0

Very Good

7,918 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair

7.6

Good

1,269 reviews

Delta

8.0

Very Good

7,918 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air France

7.5

Good

1,435 reviews

Delta

8.0

Very Good

7,918 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines

7.4

Good

8,658 reviews

Delta

8.0

Very Good

7,918 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.
What are the cheapest airlines flying from Ontario to London round-trip?
Iberia, at £455, was found to be the cheapest airline from Ontario to London.Alternate airlines flying return to your destination include Virgin Atlantic and Delta. Users have found that Iberia is 22% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Ontario to London one-way?
£277 is the cheapest one-way deal found within the past few days, from Virgin Atlantic. You may also be able to find cheap deals on Iberia and JetBlue, with prices starting from £291 and £298, 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.

See more FAQs

Hounslow

Deal

Milton Keynes

Gatwick

Luton

Slough

Croydon

Eastbourne

Wembley

Hayes

Crawley

Southend-on-Sea

Maidstone

Ipswich

Southall

Ilford

Winchester

Folkestone

Dartford

Watford

Browse thousands of different options on Cheapflights for your next trip

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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 £210

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 29/7. 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 16 April 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 16 April 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

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

Use this chart to determine the optimal time to book a return flight from Ontario to London. Price data was last updated on 11 April 2025.

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 16 April 2025.

Rainfall in London by month

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

Temperature in London by month

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

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 16 April 2025.

Get a feel of what it's like to fly with Delta, KLM and Finnair from Ontario to London by reading reviews from past customers. You can also see how each airline stacks up 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 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?

What are the cheapest airlines flying from Ontario to London round-trip?

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?

Travelling to a place near 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 Ontario to London

See prices for flight routes from nearby airports that may be better suited for you.

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 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 16 April 2025.