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Cheap flights from Ontario to London from £230

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 - 13:16LHR  London Heathrow-ONT Ontario
28h 16m1 stop Seattle/Tacoma Intl
£541Alaska Airlines
Mon, 5 Oct - Tue, 13 Oct
Virgin Atlantic Logo
12:19 - 11:20ONT  Ontario-LHR London Heathrow
15h 01m1 stop Atlanta Hartsfield-Jackson
Virgin Atlantic Logo
11:40 - 22:43LHR  London Heathrow-ONT Ontario
19h 03m1 stop Seattle/Tacoma Intl
£543Virgin Atlantic
Sun, 20 Sep - Tue, 6 Oct
Alaska Airlines Logo
11:13 - 12:20ONT  Ontario-LHR London Heathrow
18h 07m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 11:18LHR  London Heathrow-ONT Ontario
28h 33m1 stop Seattle/Tacoma Intl
£544Alaska Airlines
Mon, 26 Oct - Tue, 3 Nov
Delta Logo
06:20 - 10:40ONT  Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
Delta Logo
06:20 - 22:43LHR  London Heathrow-ONT Ontario
24h 23m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl
£545Delta
Mon, 26 Oct - Tue, 3 Nov
Delta Logo
09:45 - 11:40ONT  Ontario-LHR London Heathrow
18h 55m2 stops Salt Lake City Atlanta Hartsfield-Jackson
Delta Logo
06:30 - 22:43LHR  London Heathrow-ONT Ontario
24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
£548Delta
Mon, 26 Oct - Tue, 3 Nov
Delta Logo
11:56 - 11:20ONT  Ontario-LHR London Heathrow
15h 24m1 stop Seattle/Tacoma Intl
Delta Logo
11:40 - 22:43LHR  London Heathrow-ONT Ontario
19h 03m1 stop Seattle/Tacoma Intl
£551Delta
Tue, 6 Oct - Wed, 21 Oct
Delta Logo
07:05 - 06:25ONT  Ontario-LHR London Heathrow
15h 20m1 stop Atlanta Hartsfield-Jackson
Delta Logo
19:50 - 11:06LHR  London Heathrow-ONT Ontario
23h 16m2 stops New York John F Kennedy Intl Atlanta Hartsfield-Jackson
£553Delta
Sun, 4 Oct - Fri, 16 Oct
Delta Logo
18:00 - 11:20ONT  Ontario-LHR London Heathrow
33h 20m1 stop Seattle/Tacoma Intl
Delta Logo
11:40 - 22:43LHR  London Heathrow-ONT Ontario
19h 03m1 stop Seattle/Tacoma Intl
£554Delta
Sat, 3 Oct - Wed, 21 Oct
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
£556Alaska Airlines
Wed, 14 Oct - Wed, 21 Oct
Alaska Airlines Logo
19:59 - 15:05ONT  Ontario-LHR London Heathrow
35h 06m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 14:16LHR  London Heathrow-ONT Ontario
29h 16m1 stop Seattle/Tacoma Intl
£559Alaska Airlines
Sun, 20 Sep - Wed, 23 Sep

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British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets
British Airways
6 Dec
ONT12:42Ontario
13h 18m
1 stop
LHR10:00London Heathrow
13 Dec
LHR14:35London Heathrow
15h 18m
1 stop
ONT21:53Ontario
£612
British Airways
7 Dec
ONT12:42Ontario
13h 18m
1 stop
LHR10:00London Heathrow
10 Dec
LHR14:35London Heathrow
15h 18m
1 stop
ONT21:53Ontario
£618
British Airways
3 Mar
ONT16:59Ontario
12h 36m
1 stop
LHR13:35London Heathrow
2 Apr
LHR16:10London Heathrow
13h 57m
1 stop
ONT22:07Ontario
£628

Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets
Alaska Airlines
5 Oct
ONT14:13Ontario
16h 52m
1 stop
LHR15:05London Heathrow
13 Oct
LHR17:00London Heathrow
28h 16m
1 stop
ONT13:16Ontario
£541
Alaska Airlines
26 Oct
ONT11:13Ontario
18h 07m
1 stop
LHR12:20London Heathrow
3 Nov
LHR14:45London Heathrow
28h 33m
1 stop
ONT11:18Ontario
£544
Alaska Airlines
13 Jan
ONT11:36Ontario
16h 44m
1 stop
LHR12:20London Heathrow
21 Jan
LHR14:45London Heathrow
15h 56m
1 stop
ONT22:41Ontario
£551

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 5/10

14:13-15:05

1 stop16h 52m

London Heathrow

Tue 13/10

17:00-13:16

1 stop28h 16m

£541
Fastest return journey

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 20/9

12:19-11:20

1 stop15h 01m

London Heathrow

Tue 6/10

11:40-22:43

1 stop19h 03m

£543

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 26/10

11:13-12:20

1 stop18h 07m

London Heathrow

Tue 3/11

14:45-11:18

1 stop28h 33m

£544

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 26/10

06:20-10:40

1 stop21h 20m

London Heathrow

Tue 3/11

06:20-22:43

2 stops24h 23m

£545

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 26/10

09:45-11:40

2 stops18h 55m

London Heathrow

Tue 3/11

06:30-22:43

2 stops24h 13m

£548

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 6/10

11:56-11:20

1 stop15h 24m

London Heathrow

Wed 21/10

11:40-22:43

1 stop19h 03m

£551

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 4/10

07:05-06:25

1 stop15h 20m

London Heathrow

Fri 16/10

19:50-11:06

2 stops23h 16m

£553

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sat 3/10

18:00-11:20

1 stop33h 20m

London Heathrow

Wed 21/10

11:40-22:43

1 stop19h 03m

£554

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

£556

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 20/9

19:59-15:05

1 stop35h 06m

London Heathrow

Wed 23/9

17:00-14:16

1 stop29h 16m

£559

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 £680 to £856.
The lowest price recently found on this route was £541.

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 £483, 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 £508.

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 £672. 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 £867.

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 £631. Flights in the afternoon are often more expensive, with an average ticket price of £756.

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

£230

Fastest flight time

12h 16m

Direct flights

None
The best one-way flight to London from Ontario in the past 72 hours is £230. The best return flight deal from Ontario to London found on momondo in the last 72 hours is £541.
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