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

According to our current data, Lufthansa (£397), United Airlines (£400), and KLM (£408) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 31% less than the average price by searching for these airlines.

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

To fly one-way, consider booking your trip with Iberia, which is currently one of the cheapest options available, starting at £471. Lufthansa flights start at £477 while deals on British Airways start at £551 one-way.

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

Travellers seeking maximum savings on their London to Ontario flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

What are the most popular routes from London to Ontario?

The most popular route from London to Ontario is London Heathrow - Ontario. You may also consider London Gatwick - Ontario or London City - Ontario.

What are the most popular airlines that fly from London to Ontario?

When booking a flight from London to Ontario, you may want to consider flying on Finnair, British Airways or Lufthansa as they are the most popular for this route.

What is the cheapest day to fly round-trip from London to Ontario?

Departing on a Tuesday is a good option for securing a great price. You can expect to save up to 15% when planning your travel around this day of the week.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 58 days in advance, which can save you up to 20% on flights from London to Ontario compared to booking the week you need them. Waiting 58 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at £490. For sooner than that we have options available in the next 3 days from £698.

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

Flights from London to Ontario lean towards being more expensive in August. Prices are generally better when you fly from London to Ontario in September, with the cheapest ticket starting at £292.

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

Most people fly into Ontario (ONT) if they book a flight to Ontario from London. On average, Ontario has 0 inbound flights from London per day from 5 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

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

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

How can I find direct flights from London to Ontario?

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

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

Yes. Cheapflights offers flight deals from London 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.

£391+ Flights from London to Ontario

The best prices from London to Ontario are usually found in January or February, booked 77 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap flight deals from London to Ontario

Round-trip from	£397
One-way from	£391
Popular in	August
Cheapest in	January
Average price	£464

Lufthansa
1/5-14/5
3 total stops
32h 35m total
London to Ontario

Search Deals

20/5
2 total stops
27h 54m total
London to Ontario

Search Deals

Highest demand for flights based on searches. 17% potential increase in price (£95 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£23 potential savings vs. average return price).

Search Deals

Average for round-trip flights in February 2025

Search Deals

Find flight deals from London to Ontario

Cheapest flights from London to Ontario
Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.

Thu 1/509:30LHR - ONT

2 stops20h 30mLufthansa

Wed 14/516:15ONT - LHR

1 stop12h 05mLufthansa

Deal found 21/2£397

Thu 20/309:30LHR - ONT

2 stops20h 15mUnited Airlines

Thu 27/306:00ONT - LHR

1 stop18h 30mUnited Airlines

Deal found 19/2£400

Sat 8/314:30LHR - ONT

1 stop16h 22mKLM

Wed 12/313:30ONT - LHR

1 stop13h 30mKLM

Deal found 20/2£408

Fri 25/413:25LHR - ONT

1 stop17h 17mVirgin Atlantic

Wed 30/414:35ONT - LHR

1 stop15h 40mVirgin Atlantic

Deal found 20/2£421

Tue 4/311:10LHR - ONT

2 stops17h 42mMultiple Airlines

Tue 11/313:40ONT - LHR

2 stops15h 10mMultiple Airlines

Deal found 20/2£433

Mon 10/310:40LHR - ONT

1 stop20h 14mBritish Airways

Wed 26/310:57ONT - LHR

1 stop13h 23mBritish Airways

Deal found 20/2£436

Thu 27/210:45LHR - ONT

1 stop13h 43mDelta

Wed 12/313:30ONT - LHR

1 stop13h 30mDelta

Deal found 20/2£438

Fri 25/407:45LCY - ONT

2 stops22h 57mDelta

Wed 30/413:20ONT - LCY

2 stops19h 20mDelta

Deal found 20/2£472

Mon 10/317:00LCY - ONT

2 stops33h 01mBritish Airways

Wed 26/307:00ONT - LCY

2 stops20h 50mBritish Airways

Deal found 20/2£517

Tue 9/915:10LHR - ONT

1 stop16h 26mFinnair

Sat 13/923:09ONT - LHR

1 stop24h 31mFinnair

Deal found 20/2£581

Mon 10/306:50LCY - ONT

3 stops24h 04mMultiple Airlines

Wed 26/306:00ONT - LCY

2 stops21h 50mMultiple Airlines

Deal found 20/2£582

Sun 23/212:00LGW - ONT

1 stop27h 26mMultiple Airlines

Sun 2/310:24ONT - LGW

1 stop16h 11mMultiple Airlines

Deal found 20/2£585

Best flights from London to Ontario
Discover carefully curated flight deals from London to Ontario that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 February 2025.

Thu 1/509:30LHR - ONT

2 stops20h 30mLufthansa

Wed 14/516:15ONT - LHR

1 stop12h 05mLufthansa

Deal found 21/2£397

Thu 20/309:30LHR - ONT

2 stops20h 15mUnited Airlines

Thu 27/306:00ONT - LHR

1 stop18h 30mUnited Airlines

Deal found 19/2£400

Sat 8/314:30LHR - ONT

1 stop16h 22mKLM

Wed 12/313:30ONT - LHR

1 stop13h 30mKLM

Deal found 20/2£408

Fri 25/413:25LHR - ONT

1 stop17h 17mVirgin Atlantic

Wed 30/414:35ONT - LHR

1 stop15h 40mVirgin Atlantic

Deal found 20/2£421

Tue 4/311:10LHR - ONT

2 stops17h 42mMultiple Airlines

Tue 11/313:40ONT - LHR

2 stops15h 10mMultiple Airlines

Deal found 20/2£433

Mon 10/310:40LHR - ONT

1 stop20h 14mBritish Airways

Wed 26/310:57ONT - LHR

1 stop13h 23mBritish Airways

Deal found 20/2£436

Fri 25/407:45LCY - ONT

2 stops22h 57mDelta

Wed 30/413:20ONT - LCY

2 stops19h 20mDelta

Deal found 20/2£472

Fri 25/411:45LGW - ONT

2 stops20h 05mIberia

Wed 30/412:50ONT - LGW

2 stops23h 10mIberia

Deal found 20/2£588

Thu 1/508:15LHR - ONT

1 stop21h 07mJetBlue

Fri 9/522:40ONT - LHR

1 stop14h 05mJetBlue

Deal found 20/2£675

Sun 6/715:40LHR - ONT

1 stop13h 55mAmerican Airlines

Mon 21/717:06ONT - LHR

1 stop11h 44mAmerican Airlines

Deal found 20/2£939

Mon 10/314:50LHR - ONT

3 stops32h 52mWestJet

Wed 26/311:42ONT - LHR

2 stops18h 08mWestJet

Deal found 20/2£940

Mon 10/317:00LCY - ONT

2 stops33h 01mBritish Airways

Wed 26/307:00ONT - LCY

2 stops20h 50mBritish Airways

Deal found 20/2£517

Last-minute flights from London to Ontario
Discover last-minute flight deals from London to Ontario. Data last updated 21 February 2025 and is based on user searches.

Sun 23/212:00LGW - ONT

1 stop27h 26mMultiple Airlines

Sun 2/310:24ONT - LGW

1 stop16h 11mMultiple Airlines

Deal found 20/2£585

Thu 27/212:00LGW - ONT

1 stop16h 35mMultiple Airlines

Thu 6/310:44ONT - LGW

1 stop15h 51mMultiple Airlines

Deal found 20/2£646

Thu 27/213:50LHR - ONT

1 stop18h 03mIberia

Sat 1/314:54ONT - LHR

1 stop31h 26mIberia

Deal found 20/2£769

Thu 27/210:45LHR - ONT

1 stop13h 43mDelta

Wed 12/313:30ONT - LHR

1 stop13h 30mDelta

Deal found 20/2£438

Fri 28/214:30LHR - ONT

1 stop16h 22mKLM

Wed 5/313:10ONT - LHR

1 stop13h 25mKLM

Deal found 20/2£558

Fri 28/212:45LHR - ONT

1 stop17h 14mLufthansa

Fri 14/306:00ONT - LHR

1 stop18h 25mLufthansa

Deal found 20/2£569

Fri 28/212:45LHR - ONT

1 stop17h 14mLufthansa

Fri 7/306:00ONT - LHR

1 stop17h 25mLufthansa

Deal found 20/2£417

Sat 1/311:10LHR - ONT

2 stops17h 42mMultiple Airlines

Sat 8/310:38ONT - LHR

2 stops15h 32mMultiple Airlines

Deal found 20/2£877

Sun 2/313:45LHR - ONT

1 stop14h 55mUnited Airlines

Sun 30/315:55ONT - LHR

1 stop14h 15mUnited Airlines

Deal found 20/2£573

Sun 2/310:45LHR - ONT

1 stop13h 43mAir France

Sat 15/312:46ONT - LHR

1 stop14h 49mAir France

Deal found 20/2£8,390

Mon 3/309:25LHR - ONT

1 stop17h 10mBritish Airways

Sat 8/307:00ONT - LHR

1 stop15h 20mBritish Airways

Deal found 20/2£8,983

Tue 4/311:10LHR - ONT

2 stops17h 42mMultiple Airlines

Tue 11/313:40ONT - LHR

2 stops15h 10mMultiple Airlines

Deal found 20/2£433

One-way flights from London to Ontario
Search for one-way flight options from London to Ontario. Find affordable one-way fares based on user searches. Data last updated 21 February 2025.

Tue 20/514:00LGW - ONT

2 stops27h 54mMultiple Airlines

Deal found 21/2£391

Tue 20/514:10LHR - ONT

2 stops27h 44mMultiple Airlines

Deal found 21/2£441

Tue 18/314:10LHR - ONT

1 stop16h 44mIberia

Deal found 20/2£471

Thu 27/212:45LHR - ONT

1 stop17h 14mLufthansa

Deal found 20/2£477

Mon 14/715:40LHR - ONT

1 stop13h 55mBritish Airways

Deal found 20/2£551

Wed 30/408:15LHR - ONT

1 stop21h 07mJetBlue

Deal found 21/2£589

Tue 27/516:25LHR - ONT

1 stop15h 19mFinnair

Deal found 20/2£620

Wed 16/714:10LHR - ONT

2 stops16h 31mWestJet

Deal found 20/2£658

Mon 3/321:40LHR - ONT

2 stops31h 20mAvianca

Deal found 20/2£716

Mon 14/708:45LCY - ONT

2 stops20h 37mLufthansa

Deal found 20/2£752

Mon 31/321:05LGW - ONT

2 stops33h 22mIberia

Deal found 21/2£859

Tue 20/506:45LCY - ONT

2 stops24h 01mMultiple Airlines

Deal found 21/2£932

Find flights from London to Ontario within your budget

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 1/5

09:30-22:00

2 stops20h 30m

Ontario

Wed 14/5

16:15-12:20

1 stop12h 05m

£397

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 20/3

06:30-18:04

2 stops18h 34m

Ontario

Thu 27/3

05:05-07:10

2 stops19h 05m

£400

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 8/3

14:30-22:52

1 stop16h 22m

Ontario

Wed 12/3

13:30-10:00

1 stop13h 30m

£408

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Fri 25/4

13:25-22:42

1 stop17h 17m

Ontario

Wed 30/4

14:35-14:15

1 stop15h 40m

£421

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/3

11:10-20:52

2 stops17h 42m

Ontario

Tue 11/3

13:40-11:50

2 stops15h 10m

£433

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 10/3

10:40-23:54

1 stop20h 14m

Ontario

Wed 26/3

10:57-07:20

1 stop13h 23m

£436

LondonOntario

LCY - ONT

LCYONT

London City

Fri 25/4

07:45-22:42

2 stops22h 57m

Ontario

Wed 30/4

13:20-16:40

2 stops19h 20m

£472

LondonOntario

LCY - ONT

LCYONT

London City

Mon 10/3

17:00-19:01

2 stops33h 01m

Ontario

Wed 26/3

07:00-10:50

2 stops20h 50m

£517

LondonOntario

LCY - ONT

LCYONT

London City

Mon 10/3

06:50-23:54

3 stops24h 04m

Ontario

Wed 26/3

06:00-10:50

2 stops21h 50m

£582

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Fri 25/4

11:45-23:50

2 stops20h 05m

Ontario

Wed 30/4

12:50-20:00

2 stops23h 10m

£588

Flights are sorted by cheapest return flights first.

Deals found on 21/2

Showing 1-10 of 37 results

Best time to book a flight from London to Ontario

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

Travel insights for flights from London to Ontario

Get recent, data-driven insights about flights from London to Ontario including ideal travel times, pricing trends, and more.

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

To ensure you get the cheapest price possible for a flight from London to Ontario, you should look to book at least 77 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, March is the cheapest month in which you can book a flight from London to Ontario (average of £516). Flying from London 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 LON to ONT?

It’s optimal to fly from London to Ontario in the evening. By choosing this option you can save up to 16% on the cost of your flight, compared to a flight at midday.

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

Read reviews from past customers who have flown Delta, KLM and Finnair from London to Ontario. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

8,213 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

8,213 reviews

Delta

8.0

Very Good

8,213 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

1,331 reviews

Delta

8.0

Very Good

8,213 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

1,273 reviews

Delta

8.0

Very Good

8,213 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

Virgin Atlantic

7.5

Good

654 reviews

Delta

8.0

Very Good

8,213 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

8,759 reviews

Delta

8.0

Very Good

8,213 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 London?
Most people fly into Ontario (ONT) if they book a flight to Ontario from London. On average, Ontario has 0 inbound flights from London per day from 5 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.
What are the cheapest airlines flying from London to Ontario round-trip?
According to our current data, Lufthansa (£397), United Airlines (£400), and KLM (£408) offers the cheapest pricing from London to Ontario. You may be able to fly from London to Ontario for 31% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from London to Ontario one-way?
To fly one-way, consider booking your trip with Iberia, which is currently one of the cheapest options available, starting at £471. Lufthansa flights start at £477 while deals on British Airways start at £551 one-way.
What are the most popular routes from London to Ontario?
The most popular route from London to Ontario is London Heathrow - Ontario. You may also consider London Gatwick - Ontario or London City - Ontario.
Can I find deals for flights from London to Ontario that include hotel bookings?
Yes. In addition to deals on London to Ontario flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from London to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Ontario.
Can I find deals for business class flights from London to Ontario?
Yes. Cheapflights offers flight deals from London 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 London to Ontario?
Currently, March is the cheapest month in which you can book a flight from London to Ontario (average of £516). Flying from London 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

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Top 5 airlines flying from London to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	Cheapest£430	Average£543	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
British Airways	Cheapest£433	Average£688	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Finnair	Cheapest£434	Average£519	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Lufthansa	Cheapest£459	Average£554	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£523	Average£687	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

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

When you search for this flight from London to Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Cheapflights helps you find that perfect flight to Ontario from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from London to Ontario, users can toggle the no change fees filter when performing a flight search.

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

Yes, Cheapflights offers price alerts on London to Ontario flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from London to Ontario from £391

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 20/5. Fares are subject to change and may not be available on all flights or dates of travel.

The best prices from London to Ontario are usually found in January or February, booked 77 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap flight deals from London to Ontario

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from London to Ontario

Cheapest flights from London to OntarioExplore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.

Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.

Find flights from London to Ontario within your budget

Best time to book a flight from London to Ontario

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

Travel insights for flights from London to Ontario

Get recent, data-driven insights about flights from London to Ontario including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a return flight from London to Ontario. Price data was last updated on 14 February 2025.

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

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

Find hourly flight availability from London 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 21 February 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

Read reviews from past customers who have flown Delta, KLM and Finnair from London to Ontario. In addition to providing an overall rating, users have also rated airlines 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 London 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 London?

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

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

What are the most popular routes from London to Ontario?

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

How can I find direct flights from London to Ontario?

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

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

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

Top 5 airlines flying from London 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 London to Ontario?

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

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

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

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Cheapest flights from London to Ontario
Explore the most affordable flight options available from London to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 February 2025.