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Cheap flights from Ontario to London from £234

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.
Alaska Airlines Logo
14:13 - 15:05ONT  Ontario-LHR London Heathrow
16h 52m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 10:17LHR  London Heathrow-ONT Ontario
25h 17m1 stop Seattle/Tacoma Intl
£542Alaska Airlines
Wed, 14 Oct - Wed, 21 Oct
Alaska Airlines Logo
06:00 - 12:20ONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 22:41LHR  London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
£543Alaska Airlines
Wed, 9 Dec - Wed, 13 Jan
Alaska Airlines Logo
06:00 - 12:20ONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 15:13LHR  London Heathrow-ONT Ontario
32h 28m1 stop Seattle/Tacoma Intl
£543Alaska Airlines
Wed, 11 Nov - Wed, 18 Nov
Alaska Airlines Logo
11:13 - 15:05ONT  Ontario-LHR London Heathrow
19h 52m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 13:16LHR  London Heathrow-ONT Ontario
28h 16m1 stop Seattle/Tacoma Intl
£543Alaska Airlines
Tue, 13 Oct - Tue, 20 Oct
Alaska Airlines Logo
06:02 - 15:05ONT  Ontario-LHR London Heathrow
25h 03m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 18:00LHR  London Heathrow-ONT Ontario
33h 00m1 stop Seattle/Tacoma Intl
£545Alaska Airlines
Sun, 4 Oct - Tue, 20 Oct
Delta Logo
12:16 - 09:00ONT  Ontario-LHR London Heathrow
13h 44m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:40 - 20:54LHR  London Heathrow-ONT Ontario
16h 14m1 stop Atlanta Hartsfield-Jackson
£546Delta
Mon, 26 Oct - Wed, 11 Nov
Virgin Atlantic Logo
13:15 - 10:00ONT  Ontario-LHR London Heathrow
12h 45m1 stop Salt Lake City
Virgin Atlantic Logo
12:20 - 23:00LHR  London Heathrow-ONT Ontario
18h 40m1 stop Seattle/Tacoma Intl
£546Virgin Atlantic
Mon, 9 Nov - Wed, 25 Nov
Air France Logo
12:16 - 09:00ONT  Ontario-LHR London Heathrow
13h 44m1 stop Atlanta Hartsfield-Jackson
Air France Logo
10:45 - 16:24LHR  London Heathrow-ONT Ontario
13h 39m1 stop Salt Lake City
£547Air France
Tue, 27 Oct - Tue, 10 Nov
Multiple Airlines Logo
12:16 - 09:00ONT  Ontario-LHR London Heathrow
13h 44m1 stop Atlanta Hartsfield-Jackson
Multiple Airlines Logo
12:40 - 20:54LHR  London Heathrow-ONT Ontario
16h 14m1 stop Atlanta Hartsfield-Jackson
£547Multiple Airlines
Mon, 26 Oct - Wed, 11 Nov
Alaska Airlines Logo
12:00 - 12:20ONT  Ontario-LHR London Heathrow
16h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
14h 54m1 stop Seattle/Tacoma Intl
£547Alaska Airlines
Tue, 2 Mar - Tue, 16 Mar

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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets
Alaska Airlines
14 Oct
ONT14:13Ontario
16h 52m
1 stop
LHR15:05London Heathrow
21 Oct
LHR17:00London Heathrow
25h 17m
1 stop
ONT10:17Ontario
£542
Alaska Airlines
13 Oct
ONT11:13Ontario
19h 52m
1 stop
LHR15:05London Heathrow
20 Oct
LHR17:00London Heathrow
28h 16m
1 stop
ONT13:16Ontario
£543
Alaska Airlines
4 Oct
ONT06:02Ontario
25h 03m
1 stop
LHR15:05London Heathrow
20 Oct
LHR17:00London Heathrow
33h 00m
1 stop
ONT18:00Ontario
£545

Air France flights from Ontario to London

Our best Air France deals on Ontario to London flight tickets
Air France
11 Jan
ONT12:00Ontario
13h 00m
1 stop
LHR09:00London Heathrow
13 May
LHR10:55London Heathrow
13h 17m
1 stop
ONT16:12Ontario
£564
Air France
8 Nov
ONT07:07Ontario
17h 53m
2 stops
LGW09:00London Gatwick
15 Nov
LGW10:00London Gatwick
21h 00m
2 stops
ONT23:00Ontario
£774
Air France
23 Sept
ONT07:05Ontario
18h 20m
2 stops
LGW09:25London Gatwick
28 Sept
LGW10:25London Gatwick
19h 59m
2 stops
ONT22:24Ontario
£1,131

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

Wed 14/10

14:13-15:05

1 stop16h 52m

London Heathrow

Wed 21/10

17:00-10:17

1 stop25h 17m

£542

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 9/12

06:00-12:20

1 stop22h 20m

London Heathrow

Wed 13/1

14:45-22:41

1 stop15h 56m

£543

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 11/11

06:00-12:20

1 stop22h 20m

London Heathrow

Wed 18/11

14:45-15:13

1 stop32h 28m

£543

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 13/10

11:13-15:05

1 stop19h 52m

London Heathrow

Tue 20/10

17:00-13:16

1 stop28h 16m

£543

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 4/10

06:02-15:05

1 stop25h 03m

London Heathrow

Tue 20/10

17:00-18:00

1 stop33h 00m

£545

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 26/10

12:16-09:00

1 stop13h 44m

London Heathrow

Wed 11/11

12:40-20:54

1 stop16h 14m

£546

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 9/11

13:15-10:00

1 stop12h 45m

London Heathrow

Wed 25/11

12:20-23:00

1 stop18h 40m

£546
Fastest return journey

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 27/10

12:16-09:00

1 stop13h 44m

London Heathrow

Tue 10/11

10:45-16:24

1 stop13h 39m

£547

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 26/10

12:16-09:00

1 stop13h 44m

London Heathrow

Wed 11/11

12:40-20:54

1 stop16h 14m

£547

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 2/3

12:00-12:20

1 stop16h 20m

London Heathrow

Tue 16/3

14:45-22:39

1 stop14h 54m

£547

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 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 £684 to £860.
The lowest price recently found on this route was £542.

What is the cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in February. Flight prices, which tend to average around £485, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from Ontario averaging around £510.

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 £691. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to London for around £895.

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 £634. Flights in the afternoon are often more expensive, with an average ticket price of £781.

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

£234

Fastest flight time

12h 16m

Direct flights

None
The best one-way flight to London from Ontario in the past 72 hours is £234. The best return flight deal from Ontario to London found on momondo in the last 72 hours is £542.
The fastest flight from Ontario to London takes 12h 16m
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 16m 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
Slough
Ipswich
Maidstone
Folkestone
Hastings
Ilford
Canterbury
Chichester
Hayes
Bedford
Guildford
Colchester
Harlow
Chelmsford

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