Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Ontario to London from £238

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
16:15 - 07:25ONT  Ontario-LHR London Heathrow
31h 10m1 stop San Francisco
United Airlines Logo
06:50 - 22:15LHR  London Heathrow-ONT Ontario
23h 25m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
£567United Airlines
Tue, 2 Mar - Fri, 5 Mar
United Airlines Logo
13:45 - 07:40ONT  Ontario-LHR London Heathrow
33h 55m2 stops Denver Intl Houston George Bush Intcntl
United Airlines Logo
06:50 - 22:59LHR  London Heathrow-ONT Ontario
24h 09m3 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl San Francisco
£570United Airlines
Tue, 2 Mar - Fri, 5 Mar
United Airlines Logo
16:15 - 07:25ONT  Ontario-LHR London Heathrow
31h 10m1 stop San Francisco
United Airlines Logo
06:50 - 22:59LHR  London Heathrow-ONT Ontario
24h 09m3 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl San Francisco
£570United Airlines
Tue, 2 Mar - Fri, 5 Mar
United Airlines Logo
13:45 - 07:40ONT  Ontario-LHR London Heathrow
33h 55m2 stops Denver Intl Houston George Bush Intcntl
United Airlines Logo
06:50 - 22:59LHR  London Heathrow-ONT Ontario
24h 09m3 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl San Francisco
£573United Airlines
Tue, 2 Mar - Fri, 5 Mar
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
15h 54m1 stop Seattle/Tacoma Intl
£604Alaska Airlines
Wed, 17 Feb - Sun, 28 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
14h 54m1 stop Seattle/Tacoma Intl
£608Multiple Airlines
Mon, 22 Feb - Mon, 22 Mar
Alaska Airlines Logo
12:00 - 12:20ONT  Ontario-LHR London Heathrow
16h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 11:09LHR  London Heathrow-ONT Ontario
27h 24m1 stop Seattle/Tacoma Intl
£609Alaska Airlines
Sun, 28 Feb - Sun, 14 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 - Tue, 20 Apr
Multiple Airlines Logo
12:49 - 10:00ONT  Ontario-LHR London Heathrow
13h 11m1 stop Dallas/Fort Worth
Multiple Airlines Logo
14:45 - 11:09LHR  London Heathrow-ONT Ontario
28h 24m1 stop Seattle/Tacoma Intl
£612Multiple Airlines
Sun, 21 Feb - Sun, 28 Feb
Alaska Airlines Logo
16:00 - 15:05ONT  Ontario-LHR London Heathrow
15h 05m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 11:09LHR  London Heathrow-ONT Ontario
26h 09m1 stop Seattle/Tacoma Intl
£615Alaska Airlines
Tue, 13 Apr - Thu, 29 Apr

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

United Airlines flights from Ontario to London

Our best United Airlines deals on Ontario to London flight tickets
United Airlines
2 Mar
ONT16:15Ontario
31h 10m
1 stop
LHR07:25London Heathrow
5 Mar
LHR06:50London Heathrow
23h 25m
2 stops
ONT22:15Ontario
£567
United Airlines
2 Mar
ONT13:45Ontario
33h 55m
2 stops
LHR07:40London Heathrow
5 Mar
LHR06:50London Heathrow
24h 09m
3 stops
ONT22:59Ontario
£570
United Airlines
2 Mar
ONT16:15Ontario
31h 10m
1 stop
LHR07:25London Heathrow
5 Mar
LHR06:50London Heathrow
23h 25m
2 stops
ONT22:15Ontario
£570

Air Canada flights from Ontario to London

Our best Air Canada deals on Ontario to London flight tickets
Air Canada
14 Mar
ONT05:00Ontario
19h 10m
2 stops
LHR07:10London Heathrow
19 Mar
LHR14:30London Heathrow
28h 50m
2 stops
ONT12:20Ontario
£672
Air Canada
24 Jan
ONT05:00Ontario
18h 10m
2 stops
LHR07:10London Heathrow
2 Feb
LHR14:30London Heathrow
29h 49m
2 stops
ONT12:19Ontario
£673
Air Canada
26 Jan
ONT05:00Ontario
19h 30m
2 stops
LHR08:30London Heathrow
2 Feb
LHR14:30London Heathrow
29h 49m
2 stops
ONT12:19Ontario
£677

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

Tue 2/3

16:15-07:25

1 stop31h 10m

London Heathrow

Fri 5/3

06:50-22:15

2 stops23h 25m

£567

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 2/3

13:45-07:40

2 stops33h 55m

London Heathrow

Fri 5/3

06:50-22:59

3 stops24h 09m

£570

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 2/3

16:15-07:25

1 stop31h 10m

London Heathrow

Fri 5/3

06:50-22:59

3 stops24h 09m

£570

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 2/3

13:45-07:40

2 stops33h 55m

London Heathrow

Fri 5/3

06:50-22:59

3 stops24h 09m

£573

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 17/2

12:00-12:20

1 stop16h 20m

London Heathrow

Sun 28/2

14:45-22:39

1 stop15h 54m

£604
Fastest return journey

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 22/2

14:22-12:00

1 stop13h 38m

London Heathrow

Mon 22/3

14:45-22:39

1 stop14h 54m

£608

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 28/2

12:00-12:20

1 stop16h 20m

London Heathrow

Sun 14/3

14:45-11:09

1 stop27h 24m

£609

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 5/4

12:00-15:05

1 stop19h 05m

London Heathrow

Tue 20/4

17:00-11:09

1 stop26h 09m

£612

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 21/2

12:49-10:00

1 stop13h 11m

London Heathrow

Sun 28/2

14:45-11:09

1 stop28h 24m

£612

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 13/4

16:00-15:05

1 stop15h 05m

London Heathrow

Thu 29/4

17:00-11:09

1 stop26h 09m

£615

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 typical for flights on this route.

Typical prices usually range from £543 to £716.
The lowest price recently found on this route was £567.

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 £553, are often lower during this time because this is during the off-season. The month of March is another great option to travel to London, with average flight prices from Ontario averaging around £584.

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 £721. 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 £958.

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 £646. Flights in the afternoon are often more expensive, with an average ticket price of £843.

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

£238

Fastest flight time

12h 20m

Direct flights

None
The best one-way flight to London from Ontario in the past 72 hours is £238. The best return flight deal from Ontario to London found on momondo in the last 72 hours is £567.
The fastest flight from Ontario to London takes 12h 20m
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 20m 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
Guildford
Hayes
Bedford
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.

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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 26/11
Thu 3/12
By creating a price alert you accept our terms of use and privacy policy.

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