What is the cheapest airline that flies from Ontario to London?

United Airlines, Delta, and KLM are the most popular carriers operating from Ontario to London

Which airlines fly to London?

Virgin Atlantic, British Airways and KLM are the top three most popular airlines that fly to London from Ontario according to our data. Virgin Atlantic is the first choice among our users, with 48% of people opting to fly with this airline when travelling to London. Keep in mind that there are 12 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Ontario Airport to London?

Prices for flights from Ontario Airport to London refresh daily.

How old do you have to be to fly from Ontario Airport to London?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to London.

What documentation or ID do you need to fly to London?

The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

£279 Cheap Flights from Ontario to London in 2026

Q: What is the typical price of a round-trip flight between Ontario and London?

Prices are currently low for flights on this route. Typical prices usually range from £776 to £557. The lowest price recently found on this route was £656.

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Find the cheapest flights from Ontario to London

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

10:25 - 12:50

ONT

LHR

18h 25m

1 stop

06:15 - 21:08

LHR

ONT

22h 53m

2 stops

£656Iberia

Tue, 6 Oct - Wed, 14 Oct

07:05 - 07:15

ONT

LHR

16h 10m

1 stop

06:30 - 18:01

LHR

ONT

19h 31m

2 stops

£660Delta

Mon, 3 Aug - Thu, 20 Aug

11:48 - 13:05

ONT

LHR

17h 17m

2 stops

06:30 - 18:01

LHR

ONT

19h 31m

2 stops

£663Delta

Mon, 3 Aug - Thu, 20 Aug

13:18 - 12:25

ONT

LHR

15h 07m

1 stop

07:30 - 21:59

LHR

ONT

22h 29m

2 stops

£668United Airlines

Mon, 3 Aug - Thu, 20 Aug

13:44 - 14:10

ONT

LHR

16h 26m

1 stop

09:30 - 21:59

LHR

ONT

20h 29m

2 stops

£669United Airlines

Mon, 17 Aug - Wed, 2 Sep

05:00 - 06:30

ONT

LHR

17h 30m

2 stops

14:05 - 20:52

LHR

ONT

38h 47m

2 stops

£669Air Canada

Tue, 6 Oct - Fri, 16 Oct

09:15 - 14:40

ONT

LGW

21h 25m

2 stops

15:40 - 22:35

LGW

ONT

38h 55m

2 stops

£803Multiple Airlines

Tue, 6 Oct - Wed, 14 Oct

15:12 - 14:40

ONT

LGW

15h 28m

2 stops

11:55 - 22:39

LGW

ONT

17h 44m

2 stops

£832Icelandair

Wed, 30 Sep - Wed, 28 Oct

12:00 - 14:40

ONT

LGW

18h 40m

2 stops

15:40 - 22:39

LGW

ONT

38h 59m

2 stops

£834Icelandair

Wed, 7 Oct - Mon, 19 Oct

15:12 - 14:40

ONT

LGW

15h 28m

2 stops

15:40 - 22:39

LGW

ONT

38h 59m

2 stops

£839Multiple Airlines

Mon, 21 Sep - Thu, 15 Oct

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

Iberia

6 Oct

ONT10:25Ontario

18h 25m

1 stop

LHR12:50London Heathrow

14 Oct

LHR06:15London Heathrow

22h 53m

2 stops

ONT21:08Ontario

£656

Iberia

1 Oct

ONT10:25Ontario

18h 25m

1 stop

LHR12:50London Heathrow

15 Oct

LHR07:50London Heathrow

21h 18m

2 stops

ONT21:08Ontario

£696

Iberia

6 Oct

ONT14:22Ontario

14h 28m

1 stop

LHR12:50London Heathrow

20 Oct

LHR12:55London Heathrow

16h 13m

1 stop

ONT21:08Ontario

£699

United Airlines flights from Ontario to London

Our best United Airlines deals on Ontario to London flight tickets

United Airlines

3 Aug

ONT13:18Ontario

15h 07m

1 stop

LHR12:25London Heathrow

20 Aug

LHR07:30London Heathrow

22h 29m

2 stops

ONT21:59Ontario

£668

United Airlines

17 Aug

ONT13:44Ontario

16h 26m

1 stop

LHR14:10London Heathrow

2 Sept

LHR09:30London Heathrow

20h 29m

2 stops

ONT21:59Ontario

£669

United Airlines

22 Aug

ONT05:45Ontario

30h 55m

2 stops

LHR20:40London Heathrow

8 Sept

LHR07:30London Heathrow

22h 29m

2 stops

ONT21:59Ontario

£671

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 6/10

10:25-12:50

1 stop18h 25m

London Heathrow

Wed 14/10

06:15-21:08

2 stops22h 53m

£656

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 3/8

07:05-07:15

1 stop16h 10m

London Heathrow

Thu 20/8

06:30-18:01

2 stops19h 31m

£660

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 3/8

11:48-13:05

2 stops17h 17m

London Heathrow

Thu 20/8

06:30-18:01

2 stops19h 31m

£663

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 3/8

13:18-12:25

1 stop15h 07m

London Heathrow

Thu 20/8

07:30-21:59

2 stops22h 29m

£668

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 17/8

13:44-14:10

1 stop16h 26m

London Heathrow

Wed 2/9

09:30-21:59

2 stops20h 29m

£669

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 6/10

05:00-06:30

2 stops17h 30m

London Heathrow

Fri 16/10

14:05-20:52

2 stops38h 47m

£669

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 6/10

09:15-14:40

2 stops21h 25m

London Gatwick

Wed 14/10

15:40-22:35

2 stops38h 55m

£803

Fastest return journey

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 30/9

15:12-14:40

2 stops15h 28m

London Gatwick

Wed 28/10

11:55-22:39

2 stops17h 44m

£832

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 7/10

12:00-14:40

2 stops18h 40m

London Gatwick

Mon 19/10

15:40-22:39

2 stops38h 59m

£834

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 21/9

15:12-14:40

2 stops15h 28m

London Gatwick

Thu 15/10

15:40-22:39

2 stops38h 59m

£839

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Ontario to London

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the typical price of a round-trip flight between Ontario and London?

What is the cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in September. Flight prices, which tend to average around £185, are often lower during this time because this is during the off-season. The month of December is another great option to travel to London, with average flight prices from Ontario averaging around £208.

What is the cheapest day to depart on your flight to London?

Our data shows that Wednesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £501. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to London for around £637.

What is the cheapest time of day to depart on your flight to London?

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £538. Flights in the evening are often more expensive, with an average ticket price of £591.

When to book flights from Ontario to London

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to London according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap Ontario to London (ONT to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to London

Fastest flight time	12h 22m
Direct flights	None

The fastest flight from Ontario to London takes 12h 22m

There are no direct flights from Ontario to London. There are no popular flight routes from Ontario to London.

Search flight deals

Frequently asked questions about flying from Ontario to London

How far is Ontario to London by plane?
Ontario and London are 5417.5 mi apart from one another. Typically, this will take 12h 22m by plane in normal conditions.
When did momondo last update prices for flights from Ontario Airport to London?
Prices for flights from Ontario Airport to London refresh daily.
How old do you have to be to fly from Ontario Airport to London?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to London.
What documentation or ID do you need to fly to London?
The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Eastbourne

Milton Keynes

Luton

Gatwick

Slough

Wembley

Maidstone

Ipswich

Southend-on-Sea

Ilford

Canterbury

Guildford

Hayes

Chelmsford

Folkestone

Dover

Chichester

Bedford

Ramsgate

Harlow

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to London?

Finding the right flight to London from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

Can I find flights from Ontario to London with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to London?

Once you have performed a search for Ontario to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Ontario to London right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Ontario to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Cheap flights from Ontario to London from £279

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to London departing on 27/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Big names, great deals

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Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

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Our best United Airlines deals on Ontario to London flight tickets

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How to get the cheapest flight ticket from Ontario to London

What is the typical price of a round-trip flight between Ontario and London?

What is the cheapest month to fly to London?

What is the cheapest day to depart on your flight to London?

What is the cheapest time of day to depart on your flight to London?

What is the cheapest airline that flies from Ontario to London?

Which airlines fly to London?

When to book flights from Ontario to London

Cheap Ontario to London (ONT to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to London

Fastest flight time

Direct flights

Frequently asked questions about flying from Ontario to London

Travelling to a place near London?

Why use momondo?

An easier way to manage your London trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London

Fly your favourite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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Popular flights according to clicks in the last 7 days on momondo

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