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Cheap flights from Ontario to London from £222

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 11/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
06:00 - 07:55ONT  Ontario-LHR London Heathrow
41h 55m2 stops Houston George Bush Intcntl Chicago O'Hare Intl
United Airlines Logo
07:30 - 20:20LHR  London Heathrow-ONT Ontario
20h 50m2 stops Frankfurt am Main Denver Intl
£571United Airlines
Sun, 7 Feb - Wed, 10 Feb
Multiple Airlines Logo
14:22 - 12:00ONT  Ontario-LHR London Heathrow
13h 38m1 stop Dallas/Fort Worth
Multiple Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
£595Multiple Airlines
Sun, 31 Jan - Wed, 24 Feb
Alaska Airlines Logo
06:00 - 12:20ONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
£596Alaska Airlines
Wed, 9 Dec - Mon, 14 Dec
Alaska Airlines Logo
12:02 - 12:20ONT  Ontario-LHR London Heathrow
16h 18m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 15:05LHR  London Heathrow-ONT Ontario
32h 20m1 stop Seattle/Tacoma Intl
£600Alaska Airlines
Wed, 18 Nov - Wed, 25 Nov
Alaska Airlines Logo
16:09 - 12:20ONT  Ontario-LHR London Heathrow
36h 11m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 15:13LHR  London Heathrow-ONT Ontario
32h 28m1 stop Seattle/Tacoma Intl
£608Alaska Airlines
Sat, 14 Nov - Wed, 18 Nov
United Airlines Logo
18:53 - 11:15ONT  Ontario-LHR London Heathrow
32h 22m1 stop San Francisco
United Airlines Logo
07:30 - 20:20LHR  London Heathrow-ONT Ontario
20h 50m2 stops Frankfurt am Main Denver Intl
£611United Airlines
Sun, 7 Feb - Wed, 10 Feb
Multiple Airlines Logo
12:42 - 10:00ONT  Ontario-LHR London Heathrow
13h 18m1 stop Dallas/Fort Worth
Multiple Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
£618Multiple Airlines
Sun, 22 Nov - Mon, 14 Dec
Multiple Airlines Logo
06:00 - 12:20ONT  Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
13:15 - 19:05LHR  London Heathrow-ONT Ontario
13h 50m1 stop Phoenix Sky Harbor Intl
£618Multiple Airlines
Mon, 23 Nov - Mon, 30 Nov
British Airways Logo
07:00 - 06:50ONT  Ontario-LHR London Heathrow
15h 50m1 stop Dallas/Fort Worth
British Airways Logo
11:15 - 22:45LHR  London Heathrow-ONT Ontario
19h 30m1 stop Dallas/Fort Worth
£625British Airways
Sun, 7 Feb - Wed, 10 Feb
British Airways Logo
12:43 - 10:00ONT  Ontario-LHR London Heathrow
13h 17m1 stop Dallas/Fort Worth
British Airways Logo
14:45 - 22:45LHR  London Heathrow-ONT Ontario
16h 00m1 stop Dallas/Fort Worth
£626British Airways
Mon, 11 Jan - Sat, 16 Jan

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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets
Alaska Airlines
9 Dec
ONT06:00Ontario
22h 20m
1 stop
LHR12:20London Heathrow
14 Dec
LHR14:45London Heathrow
15h 54m
1 stop
ONT22:39Ontario
£596
Alaska Airlines
18 Nov
ONT12:02Ontario
16h 18m
1 stop
LHR12:20London Heathrow
25 Nov
LHR14:45London Heathrow
32h 20m
1 stop
ONT15:05Ontario
£600
Alaska Airlines
14 Nov
ONT16:09Ontario
36h 11m
1 stop
LHR12:20London Heathrow
18 Nov
LHR14:45London Heathrow
32h 28m
1 stop
ONT15:13Ontario
£608

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets
Iberia
25 Nov
ONT06:00Ontario
16h 50m
1 stop
LHR06:50London Heathrow
2 Dec
LHR19:40London Heathrow
22h 00m
2 stops
ONT09:40Ontario
£638
Iberia
25 Nov
ONT07:00Ontario
15h 50m
1 stop
LHR06:50London Heathrow
1 Dec
LHR06:05London Heathrow
20h 52m
2 stops
ONT18:57Ontario
£660
Iberia
26 Oct
ONT10:25Ontario
13h 25m
1 stop
LHR06:50London Heathrow
3 Nov
LHR06:05London Heathrow
20h 42m
2 stops
ONT18:47Ontario
£666

momondo Fare Finder

 
Customise your flight search to find flights from Ontario to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 16 August 2026.
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

Sun 7/2

06:00-07:55

2 stops41h 55m

London Heathrow

Wed 10/2

07:30-20:20

2 stops20h 50m

£571

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 31/1

14:22-12:00

1 stop13h 38m

London Heathrow

Wed 24/2

14:45-22:39

1 stop15h 54m

£595

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 9/12

06:00-12:20

1 stop22h 20m

London Heathrow

Mon 14/12

14:45-22:39

1 stop15h 54m

£596

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 18/11

12:02-12:20

1 stop16h 18m

London Heathrow

Wed 25/11

14:45-15:05

1 stop32h 20m

£600

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sat 14/11

16:09-12:20

1 stop36h 11m

London Heathrow

Wed 18/11

14:45-15:13

1 stop32h 28m

£608

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 7/2

18:53-11:15

1 stop32h 22m

London Heathrow

Wed 10/2

07:30-20:20

2 stops20h 50m

£611
Fastest return journey

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 22/11

12:42-10:00

1 stop13h 18m

London Heathrow

Mon 14/12

14:45-22:39

1 stop15h 54m

£618

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 23/11

06:00-12:20

1 stop22h 20m

London Heathrow

Mon 30/11

13:15-19:05

1 stop13h 50m

£618

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 7/2

07:00-06:50

1 stop15h 50m

London Heathrow

Wed 10/2

11:15-22:45

1 stop19h 30m

£625

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 11/1

12:43-10:00

1 stop13h 17m

London Heathrow

Sat 16/1

14:45-22:45

1 stop16h 00m

£626

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 £681 to £802.
The lowest price recently found on this route was £571.

What is the cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in March. Flight prices, which tend to average around £482, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Ontario averaging around £483.

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 £652. 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 £785.

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 £452. Flights in the afternoon are often more expensive, with an average ticket price of £712.

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.

Travelling to a place near London?

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

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport