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

Alaska Airlines, United Airlines, and Delta 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.

£137 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 £1,152 to £996. The lowest price recently found on this route was £562.

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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.

07:00 - 10:50

ONT

LHR

19h 50m

2 stops

09:30 - 21:21

LHR

ONT

19h 51m

2 stops

£562United Airlines

Tue, 17 Nov - Thu, 19 Nov

07:00 - 13:00

ONT

LHR

22h 00m

2 stops

10:05 - 17:47

LHR

ONT

15h 42m

1 stop

£608SWISS

Tue, 17 Nov - Thu, 19 Nov

14:22 - 14:25

ONT

LHR

16h 03m

1 stop

11:30 - 23:06

LHR

ONT

19h 36m

2 stops

£613Multiple Airlines

Wed, 16 Sep - Tue, 13 Oct

13:05 - 10:30

ONT

LHR

13h 25m

1 stop

12:55 - 20:09

LHR

ONT

15h 14m

1 stop

£615British Airways

Wed, 9 Sep - Fri, 11 Sep

05:00 - 06:30

ONT

LHR

17h 30m

2 stops

11:30 - 23:06

LHR

ONT

19h 36m

2 stops

£616Multiple Airlines

Wed, 16 Sep - Tue, 13 Oct

14:59 - 12:15

ONT

LHR

13h 16m

1 stop

14:45 - 22:23

LHR

ONT

15h 38m

1 stop

£622British Airways

Sun, 1 Nov - Sat, 14 Nov

07:00 - 09:25

ONT

LGW

18h 25m

2 stops

10:35 - 22:43

LGW

ONT

20h 08m

2 stops

£655Delta

Tue, 6 Oct - Tue, 13 Oct

07:00 - 07:15

ONT

LCY

16h 15m

2 stops

07:45 - 18:18

LCY

ONT

18h 33m

2 stops

£668Delta

Tue, 17 Nov - Thu, 19 Nov

10:25 - 13:20

ONT

LCY

18h 55m

2 stops

09:35 - 22:59

LCY

ONT

21h 24m

2 stops

£837Iberia

Mon, 3 Aug - Wed, 19 Aug

10:25 - 15:15

ONT

LCY

20h 50m

2 stops

19:15 - 09:29

LCY

ONT

21h 14m

2 stops

£939Iberia

Sun, 18 Oct - Mon, 26 Oct

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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Alaska Airlines

13 Sept

ONT12:12Ontario

18h 53m

1 stop

LHR15:05London Heathrow

20 Sept

LHR17:00London Heathrow

14h 24m

1 stop

ONT23:24Ontario

£628

Alaska Airlines

20 Sept

ONT12:12Ontario

18h 53m

1 stop

LHR15:05London Heathrow

3 Oct

LHR17:00London Heathrow

14h 42m

1 stop

ONT23:42Ontario

£629

Alaska Airlines

20 Oct

ONT14:14Ontario

16h 51m

1 stop

LHR15:05London Heathrow

27 Oct

LHR14:45London Heathrow

15h 57m

1 stop

ONT23:42Ontario

£654

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

Iberia

21 Oct

ONT14:22Ontario

16h 03m

1 stop

LHR14:25London Heathrow

28 Oct

LHR19:40London Heathrow

20h 49m

2 stops

ONT09:29Ontario

£642

Iberia

10 Nov

ONT06:10Ontario

16h 40m

1 stop

LHR06:50London Heathrow

17 Nov

LHR06:00London Heathrow

24h 23m

2 stops

ONT22:23Ontario

£646

Iberia

10 Nov

ONT10:47Ontario

17h 18m

2 stops

LHR12:05London Heathrow

17 Nov

LHR06:00London Heathrow

24h 23m

2 stops

ONT22:23Ontario

£652

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 17/11

07:00-10:50

2 stops19h 50m

London Heathrow

Thu 19/11

09:30-21:21

2 stops19h 51m

£562

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 17/11

07:00-13:00

2 stops22h 00m

London Heathrow

Thu 19/11

10:05-17:47

1 stop15h 42m

£608

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 16/9

14:22-14:25

1 stop16h 03m

London Heathrow

Tue 13/10

11:30-23:06

2 stops19h 36m

£613

Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 9/9

13:05-10:30

1 stop13h 25m

London Heathrow

Fri 11/9

12:55-20:09

1 stop15h 14m

£615

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 16/9

05:00-06:30

2 stops17h 30m

London Heathrow

Tue 13/10

11:30-23:06

2 stops19h 36m

£616

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 1/11

14:59-12:15

1 stop13h 16m

London Heathrow

Sat 14/11

14:45-22:23

1 stop15h 38m

£622

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 6/10

07:00-09:25

2 stops18h 25m

London Gatwick

Tue 13/10

10:35-22:43

2 stops20h 08m

£655

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Tue 17/11

07:00-07:15

2 stops16h 15m

London City

Thu 19/11

07:45-18:18

2 stops18h 33m

£668

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Mon 3/8

10:25-13:20

2 stops18h 55m

London City

Wed 19/8

09:35-22:59

2 stops21h 24m

£837

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Sun 18/10

10:25-15:15

2 stops20h 50m

London City

Mon 26/10

19:15-09:29

2 stops21h 14m

£939

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 £187, 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 £210.

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 £543. 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 £679.

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

The cheapest time of day to fly to London is at midday when flights can be purchased for as low as £538. Flights in the evening are often more expensive, with an average ticket price of £622.

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.

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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

Gatwick

Wembley

Luton

Slough

Southend-on-Sea

Maidstone

Ipswich

Ilford

Canterbury

Guildford

Folkestone

Hayes

Chelmsford

Bedford

Dover

Chichester

Harlow

Colchester

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 £137

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 29/8. 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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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

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

See travel insights to London from

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.

Popular Cities in the United Kingdom

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

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