Which airport is the most popular layover for flights between Ontario and London?

Denver (DEN) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to London?

British Airways, Virgin Atlantic and Iberia 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 51% 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.

Which layover airport has the shortest connection time from Ontario to London?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 13m.

Which layover airport offers the lowest fares from Ontario to London?

Flights via Copenhagen (CPH) offer the lowest average round-trip price of $474.

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

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

Which layover airport has the shortest travel time from Ontario to London?

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 12h 50m.

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 November 2025, there are 6 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.

$339 Cheap Flights from Ontario to London in 2025/26

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 $681 to $1,012. The lowest price recently found on this route was $589.

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Find the cheapest flights from Ontario to London

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4:45 pm - 1:15 pmONT-LHR

12h 30m1 stop

3:00 pm - 10:48 pmLHR-ONT

15h 48m1 stop

$589British Airways

Find Deal

Tue, Jan 20 - Tue, Feb 3

12:41 pm - 11:40 amONT-LHR

14h 59m1 stop

2:05 pm - 10:51 pmLHR-ONT

40h 46m2 stops

$601Virgin Atlantic

Find Deal

Wed, Jan 28 - Sun, Feb 1

10:58 am - 8:35 amONT-LHR

13h 37m1 stop

3:00 pm - 10:48 pmLHR-ONT

15h 48m1 stop

$604Iberia

Find Deal

Sun, Jan 11 - Tue, Jan 27

6:00 am - 8:05 amONT-LHR

18h 05m2 stops

8:40 am - 9:05 pmLHR-ONT

20h 25m2 stops

$605Delta

Find Deal

Wed, Jan 28 - Sun, Feb 1

11:55 am - 9:00 amONT-LHR

13h 05m1 stop

9:55 am - 10:40 pmLHR-ONT

20h 45m2 stops

$612Delta

Find Deal

Wed, Apr 15 - Tue, May 5

11:01 am - 8:05 amONT-LHR

13h 04m1 stop

4:25 pm - 11:40 pmLHR-ONT

15h 15m1 stop

$618Iberia

Find Deal

Wed, Apr 15 - Tue, May 5

1:53 pm - 12:00 pmONT-LHR

14h 07m1 stop

6:35 am - 5:43 pmLHR-ONT

19h 08m2 stops

$624United Airlines

Find Deal

Tue, Jan 20 - Tue, Jan 27

1:24 pm - 9:40 amONT-LHR

12h 16m1 stop

1:30 pm - 10:53 pmLHR-ONT

17h 23m2 stops

$625United Airlines

Find Deal

Fri, Jan 9 - Fri, Jan 16

4:45 pm - 9:00 amONT-LGW

32h 15m2 stops

11:20 am - 2:18 pmLGW-ONT

34h 58m2 stops

$804American Airlines

Find Deal

Sat, Jan 17 - Mon, Feb 2

7:16 am - 9:00 amONT-LGW

17h 44m2 stops

12:30 pm - 10:08 amLGW-ONT

53h 38m2 stops

$805American Airlines

Find Deal

Wed, Jan 28 - Sun, Feb 1

British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets

British Airways

Jan 20

ONT4:45 pmOntario

12h 30m

1 stop

LHR1:15 pmLondon Heathrow

Feb 3

LHR3:00 pmLondon Heathrow

15h 48m

1 stop

ONT10:48 pmOntario

$589

Find similar

British Airways

Dec 2

ONT3:19 pmOntario

12h 56m

1 stop

LHR12:15 pmLondon Heathrow

Dec 9

LHR3:00 pmLondon Heathrow

15h 28m

1 stop

ONT10:28 pmOntario

$644

Find similar

British Airways

Dec 4

ONT10:47 amOntario

15h 13m

1 stop

LHR10:00 amLondon Heathrow

Dec 10

LHR10:15 amLondon Heathrow

16h 02m

1 stop

ONT6:17 pmOntario

$648

Find similar

Virgin Atlantic flights from Ontario to London

Our best Virgin Atlantic deals on Ontario to London flight tickets

Virgin Atlantic

Dec 2

ONT1:29 pmOntario

12h 31m

1 stop

LHR10:00 amLondon Heathrow

Dec 16

LHR9:40 amLondon Heathrow

22h 18m

2 stops

ONT11:58 pmOntario

$599

Find similar

Virgin Atlantic

Jan 28

ONT12:41 pmOntario

14h 59m

1 stop

LHR11:40 amLondon Heathrow

Feb 1

LHR2:05 pmLondon Heathrow

40h 46m

2 stops

ONT10:51 pmOntario

$601

Find similar

Virgin Atlantic

Jan 24

ONT6:00 amOntario

17h 05m

2 stops

LHR7:05 amLondon Heathrow

Feb 13

LHR12:20 pmLondon Heathrow

18h 17m

1 stop

ONT10:37 pmOntario

$629

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 1/20

4:45 pm-1:15 pm

1 stop12h 30m

London Heathrow

Tue 2/3

3:00 pm-10:48 pm

1 stop15h 48m

$589

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/28

12:41 pm-11:40 am

1 stop14h 59m

London Heathrow

Sun 2/1

2:05 pm-10:51 pm

2 stops40h 46m

$601

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 1/11

10:58 am-8:35 am

1 stop13h 37m

London Heathrow

Tue 1/27

3:00 pm-10:48 pm

1 stop15h 48m

$604

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/28

6:00 am-8:05 am

2 stops18h 05m

London Heathrow

Sun 2/1

8:40 am-9:05 pm

2 stops20h 25m

$605

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 4/15

11:55 am-9:00 am

1 stop13h 05m

London Heathrow

Tue 5/5

9:55 am-10:40 pm

2 stops20h 45m

$612

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 4/15

11:01 am-8:05 am

1 stop13h 04m

London Heathrow

Tue 5/5

4:25 pm-11:40 pm

1 stop15h 15m

$618

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 1/20

1:53 pm-12:00 pm

1 stop14h 07m

London Heathrow

Tue 1/27

6:35 am-5:43 pm

2 stops19h 08m

$624

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 1/9

1:24 pm-9:40 am

1 stop12h 16m

London Heathrow

Fri 1/16

1:30 pm-10:53 pm

2 stops17h 23m

$625

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Sat 1/17

4:45 pm-9:00 am

2 stops32h 15m

London Gatwick

Mon 2/2

11:20 am-2:18 pm

2 stops34h 58m

$804

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 1/28

7:16 am-9:00 am

2 stops17h 44m

London Gatwick

Sun 2/1

12:30 pm-10:08 am

2 stops53h 38m

$805

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Layovers

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 October. Flight prices, which tend to average around $679, 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 $684.

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 $760. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $854. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $776 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $823. 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 $834 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 $606 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

Fastest flight time	12h 06m
Direct flights	None

The fastest flight from Ontario to London takes 12h 06m

There are no direct flights from Ontario to London. There are no popular flight routes from Ontario to London.

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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 06m.
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 November 2025, there are 6 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 27% of all bookings. The subsequent popular airlines are British Airways at 23%, Delta at 19%, and American Airlines 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 $570	Free Cancellation	Rating 7.9 8,003 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.7 1,423 reviews	Search KLM flights
Iberia	PriceFrom $615	Free Cancellation	Rating 7.0 3,036 reviews	Search Iberia flights
American Airlines	PriceFrom $624	Free Cancellation	Rating 7.2 11,037 reviews	Search American Airlines flights
British Airways	PriceFrom $653	Free Cancellation	Rating 6.7 7,539 reviews	Search British Airways flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 9,050 reviews	Search United Airlines flights

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Crawley

Brentwood

Chelmsford

Wembley

Romford

Watford

Ilford

Cobham

Folkestone

Uxbridge

Stansted

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.