What airlines fly to London?

British Airways, Iberia and American Airlines are the top three most popular airlines that fly to London from Ontario according to our data. British Airways is the first choice among our users, with 47% of people opting to fly with this airline when traveling to London. Keep in mind that there are 19 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Ontario to London?

British Airways, United Airlines, and KLM are the most popular carriers operating from Ontario to London

When did momondo last update prices for flights from Ontario Airport to London?

Prices for flights from Ontario Airport to London are updated daily.

How many operators does momondo search for flights from Ontario Airport to London?

As of July 2025, there are 7 operators available to choose from for flights from Ontario Airport to London.

How old do you have to be to fly from Ontario Airport to London?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to London.

What documentation or ID do you need to fly to London?

The necessary travel and health documents for your London trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$315 Cheap Flights from Ontario to London in 2025

Q: 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 $645 to $1,080. The lowest price recently found on this route was $497.

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Find the cheapest flights from Ontario to London

Round-trip

One-way

Last minute

Cheap round-trip flights

9:50 am - 9:50 amONT-LHR

16h 00m1 stop

10:55 am - 10:40 pmLHR-ONT

19h 45m1 stop

$497Virgin Atlantic

Find Deal

Tue, Aug 19 - Thu, Sep 4

1:15 pm - 9:50 amONT-LHR

12h 35m1 stop

10:55 am - 10:40 pmLHR-ONT

19h 45m1 stop

$499Virgin Atlantic

Find Deal

Tue, Aug 19 - Thu, Sep 4

11:29 am - 3:45 pmONT-LHR

21h 16m1 stop

6:20 am - 10:42 pmLHR-ONT

24h 22m2 stops

$524Delta

Find Deal

Mon, Oct 27 - Wed, Nov 5

6:00 am - 10:00 amONT-LHR

21h 00m1 stop

6:20 am - 5:17 pmLHR-ONT

18h 57m2 stops

$525Delta

Find Deal

Tue, Oct 28 - Tue, Nov 4

4:49 pm - 12:50 pmONT-LHR

12h 01m1 stop

2:55 pm - 10:00 pmLHR-ONT

15h 05m1 stop

$650British Airways

Find Deal

Wed, Oct 15 - Tue, Nov 4

1:34 pm - 12:20 pmONT-LHR

14h 46m1 stop

2:50 pm - 8:43 pmLHR-ONT

13h 53m1 stop

$652United Airlines

Find Deal

Sun, Aug 3 - Tue, Aug 19

2:57 pm - 2:25 pmONT-LHR

15h 28m1 stop

10:30 am - 6:54 pmLHR-ONT

16h 24m1 stop

$657Iberia

Find Deal

Tue, Aug 19 - Thu, Sep 4

2:57 pm - 2:25 pmONT-LHR

15h 28m1 stop

10:30 am - 6:54 pmLHR-ONT

16h 24m1 stop

$658Iberia

Find Deal

Tue, Aug 19 - Fri, Sep 5

4:49 pm - 12:50 pmONT-LHR

12h 01m1 stop

2:55 pm - 10:42 pmLHR-ONT

14h 47m1 stop

$660British Airways

Find Deal

Sun, Oct 19 - Tue, Oct 28

1:19 pm - 10:25 amONT-LHR

13h 06m1 stop

10:35 am - 5:37 pmLHR-ONT

15h 02m1 stop

$662United Airlines

Find Deal

Tue, Aug 12 - Tue, Aug 19

United Airlines flights from Ontario to London

Our best United Airlines deals on Ontario to London flight tickets

United Airlines

Aug 3

ONT1:34 pmOntario

14h 46m

1 stop

LHR12:20 pmLondon Heathrow

Aug 19

LHR2:50 pmLondon Heathrow

13h 53m

1 stop

ONT8:43 pmOntario

$652

Find similar

United Airlines

Aug 12

ONT1:19 pmOntario

13h 06m

1 stop

LHR10:25 amLondon Heathrow

Aug 19

LHR10:35 amLondon Heathrow

15h 02m

1 stop

ONT5:37 pmOntario

$662

Find similar

United Airlines

Oct 29

ONT1:33 pmOntario

14h 42m

2 stops

LHR11:15 amLondon Heathrow

Nov 7

LHR1:45 pmLondon Heathrow

17h 00m

1 stop

ONT10:45 pmOntario

$666

Find similar

Virgin Atlantic flights from Ontario to London

Our best Virgin Atlantic deals on Ontario to London flight tickets

Virgin Atlantic

Aug 19

ONT9:50 amOntario

16h 00m

1 stop

LHR9:50 amLondon Heathrow

Sep 4

LHR10:55 amLondon Heathrow

19h 45m

1 stop

ONT10:40 pmOntario

$497

Find similar

Virgin Atlantic

Aug 19

ONT1:15 pmOntario

12h 35m

1 stop

LHR9:50 amLondon Heathrow

Sep 4

LHR10:55 amLondon Heathrow

19h 45m

1 stop

ONT10:40 pmOntario

$499

Find similar

Virgin Atlantic

Aug 27

ONT11:40 amOntario

15h 40m

1 stop

LHR11:20 amLondon Heathrow

Sep 3

LHR8:40 amLondon Heathrow

22h 02m

2 stops

ONT10:42 pmOntario

$516

Find similar

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

Prices

Airlines

What is the typical price of a round-trip flight between Ontario and London?

What is the cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in September. Flight prices, which tend to average around $654, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from Ontario averaging around $676.

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

The cheapest day to depart from Ontario to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $769. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $888. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Ontario in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $787 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $847. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to London?

You are more likely to see cheaper flights to London from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $846 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Ontario for as low as $674 on momondo.

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 round-trip 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	$315
Fastest flight time	12h 01m
Direct flights	None
Airports in London	3 airports

The best one-way flight to London from Ontario in the past 72 hours is $315. The best round-trip flight deal from Ontario to London found on momondo in the last 72 hours is $497.

The fastest flight from Ontario to London takes 12h 01m

There are no direct flights from Ontario to London. Popular non-direct routes for this connection are Ontario Airport - London Gatwick Airport, Ontario Airport - London Heathrow Airport and Ontario Airport - London City Airport.

There are 3 airports near London: London City (LCY), London Heathrow (LHR), London Gatwick (LGW)

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How far is Ontario to London by plane?
The straight-line distance from Ontario to London is 5417.5 mi. A reasonable flight in good conditions will take 12h 01m.
When did momondo last update prices for flights from Ontario Airport to London?
Prices for flights from Ontario Airport to London are updated daily.
How many operators does momondo search for flights from Ontario Airport to London?
As of July 2025, there are 7 operators available to choose from for flights from Ontario Airport to London.
How old do you have to be to fly from Ontario Airport to London?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to London.
What documentation or ID do you need to fly to London?
The necessary travel and health documents for your London trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Ontario to London?
momondo data reveals that the most frequently booked airline on the route from Ontario to London is United Airlines, representing 29% of all bookings. The subsequent popular airlines are American Airlines at 21%, British Airways at 20%, and Delta at 18%.

Best airlines flying from Ontario to London

Compare and see reviews for airlines that fly from Ontario to London with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $572	Free Cancellation	Rating 8.0 7,953 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.8 1,372 reviews	Search KLM flights
Iberia	PriceFrom $582	Free Cancellation	Rating 7.0 2,834 reviews	Search Iberia flights
Virgin Atlantic	PriceFrom $629	Free Cancellation	Rating 7.4 655 reviews	Search Virgin Atlantic flights
United Airlines	PriceFrom $633	Free Cancellation	Rating 7.4 8,856 reviews	Search United Airlines flights
British Airways	PriceFrom $648	Free Cancellation	Rating 6.6 7,134 reviews	Search British Airways flights
American Airlines	PriceFrom $648	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights

Gatwick

Hounslow

Slough

Dover

Luton

Croydon

Dartford

Guildford

Stansted

Milton Keynes

Hayes

Ilford

Colchester

Chelmsford

Canterbury

Watford

Richmond

Wembley

Dagenham

St. Albans

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to London?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to London. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to London with flexible booking policies on momondo?

All flight searches from Ontario to London on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to London?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to London.

I’m not ready to book a flight from Ontario to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.