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Cheap flights from Ontario to London from £223

1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Ontario to London

Cheap return flights

Enter your travel dates to find the best prices.
United Airlines Logo
13:45 - 10:15ONT  Ontario-LHR London Heathrow
36h 30m2 stops Denver Intl Houston George Bush Intcntl
United Airlines Logo
09:00 - 20:19LHR  London Heathrow-ONT Ontario
19h 19m2 stops Zurich San Francisco
£568United Airlines
Mon, 1 Mar - Thu, 4 Mar
Multiple Airlines Logo
06:00 - 19:30ONT  Ontario-LHR London Heathrow
29h 30m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 - 22:17LHR  London Heathrow-ONT Ontario
18h 02m2 stops Reykjavik Keflavik Intl Denver Intl
£599Multiple Airlines
Wed, 2 Dec - Wed, 9 Dec
Multiple Airlines Logo
06:45 - 19:30ONT  Ontario-LHR London Heathrow
28h 45m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
20:35 - 00:17LHR  London Heathrow-ONT Ontario
35h 42m2 stops Reykjavik Keflavik Intl Denver Intl
£601Multiple Airlines
Wed, 25 Nov - Wed, 2 Dec
Multiple Airlines Logo
06:00 - 10:50ONT  Ontario-LHR London Heathrow
20h 50m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
20:35 - 00:20LHR  London Heathrow-ONT Ontario
35h 45m2 stops Reykjavik Keflavik Intl Denver Intl
£602Multiple Airlines
Thu, 3 Dec - Sun, 13 Dec
Multiple Airlines Logo
16:25 - 13:35ONT  Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
Multiple Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
£604Multiple Airlines
Sun, 7 Mar - Sat, 13 Mar
Multiple Airlines Logo
14:23 - 12:15ONT  Ontario-LHR London Heathrow
13h 52m1 stop Dallas/Fort Worth
Multiple Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
£605Multiple Airlines
Wed, 10 Feb - Wed, 24 Feb
Multiple Airlines Logo
16:52 - 14:20ONT  Ontario-LHR London Heathrow
13h 28m1 stop Phoenix Sky Harbor Intl
Multiple Airlines Logo
17:00 - 23:59LHR  London Heathrow-ONT Ontario
14h 59m1 stop Seattle/Tacoma Intl
£607Multiple Airlines
Wed, 7 Apr - Wed, 19 May
Multiple Airlines Logo
14:29 - 12:00ONT  Ontario-LHR London Heathrow
13h 31m1 stop Dallas/Fort Worth
Multiple Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
14h 54m1 stop Seattle/Tacoma Intl
£608Multiple Airlines
Mon, 8 Mar - Wed, 24 Mar
Alaska Airlines Logo
12:00 - 15:05ONT  Ontario-LHR London Heathrow
19h 05m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 11:09LHR  London Heathrow-ONT Ontario
26h 09m1 stop Seattle/Tacoma Intl
£612Alaska Airlines
Mon, 5 Apr - Wed, 14 Apr
Multiple Airlines Logo
06:00 - 19:30ONT  Ontario-LHR London Heathrow
29h 30m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 - 22:17LHR  London Heathrow-ONT Ontario
18h 02m2 stops Reykjavik Keflavik Intl Denver Intl
£612Multiple Airlines
Wed, 2 Dec - Wed, 9 Dec

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Virgin Atlantic flights from Ontario to London

Our best Virgin Atlantic deals on Ontario to London flight tickets
Virgin Atlantic
11 Nov
ONT11:57Ontario
14h 43m
1 stop
LHR10:40London Heathrow
25 Nov
LHR06:30London Heathrow
24h 30m
2 stops
ONT23:00Ontario
£722
Virgin Atlantic
4 Nov
ONT06:20Ontario
23h 25m
2 stops
LHR13:45London Heathrow
11 Nov
LHR11:45London Heathrow
43h 15m
2 stops
ONT23:00Ontario
£723
Virgin Atlantic
4 Nov
ONT07:07Ontario
15h 18m
1 stop
LHR06:25London Heathrow
11 Nov
LHR11:45London Heathrow
43h 15m
2 stops
ONT23:00Ontario
£724

Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets
Alaska Airlines
5 Apr
ONT12:00Ontario
19h 05m
1 stop
LHR15:05London Heathrow
14 Apr
LHR17:00London Heathrow
26h 09m
1 stop
ONT11:09Ontario
£612
Alaska Airlines
5 Apr
ONT16:00Ontario
15h 05m
1 stop
LHR15:05London Heathrow
3 May
LHR17:00London Heathrow
29h 47m
1 stop
ONT14:47Ontario
£615
Alaska Airlines
26 Apr
ONT16:00Ontario
15h 05m
1 stop
LHR15:05London Heathrow
9 May
LHR17:00London Heathrow
26h 09m
1 stop
ONT11:09Ontario
£617

momondo 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

Cheapest return flight

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 1/3

13:45-10:15

2 stops36h 30m

London Heathrow

Thu 4/3

09:00-20:19

2 stops19h 19m

£568

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 2/12

06:00-19:30

2 stops29h 30m

London Heathrow

Wed 9/12

12:15-22:17

2 stops18h 02m

£599

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 25/11

06:45-19:30

2 stops28h 45m

London Heathrow

Wed 2/12

20:35-00:17

2 stops35h 42m

£601

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Thu 3/12

06:00-10:50

2 stops20h 50m

London Heathrow

Sun 13/12

20:35-00:20

2 stops35h 45m

£602

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 7/3

16:25-13:35

1 stop13h 10m

London Heathrow

Sat 13/3

14:45-22:39

1 stop15h 54m

£604

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 10/2

14:23-12:15

1 stop13h 52m

London Heathrow

Wed 24/2

14:45-22:39

1 stop15h 54m

£605

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 7/4

16:52-14:20

1 stop13h 28m

London Heathrow

Wed 19/5

17:00-23:59

1 stop14h 59m

£607
Fastest return journey

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 8/3

14:29-12:00

1 stop13h 31m

London Heathrow

Wed 24/3

14:45-22:39

1 stop14h 54m

£608

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 5/4

12:00-15:05

1 stop19h 05m

London Heathrow

Wed 14/4

17:00-11:09

1 stop26h 09m

£612

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 2/12

06:00-19:30

2 stops29h 30m

London Heathrow

Wed 9/12

12:15-22:17

2 stops18h 02m

£612

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

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

What is the cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in December. Flight prices, which tend to average around £551, are often lower during this time because this is during the off-season. The month of November is another great option to travel to London, with average flight prices from Ontario averaging around £627.

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

Our data shows that Tuesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £737. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to London for around £964.

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 £643. Flights in the evening are often more expensive, with an average ticket price of £845.

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

Best price found

£223

Fastest flight time

12h 00m

Direct flights

None
The best one-way flight to London from Ontario in the past 72 hours is £223. The best return flight deal from Ontario to London found on momondo in the last 72 hours is £568.
The fastest flight from Ontario to London takes 12h 00m
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 00m 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.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Wembley
Gatwick
Milton Keynes
Southend-on-Sea
Luton
Ipswich
Slough
Maidstone
Folkestone
Hastings
Ilford
Canterbury
Colchester
Chichester
Hayes
Bedford
Guildford
Winchester
Worthing

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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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport