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

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 12h 40m.

What airlines fly to London?

British Airways, Virgin Atlantic and United 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 50% of people opting to fly with this airline when traveling to London. Keep in mind that there are 20 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.

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

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

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

Dallas (DFW) was the most common stop: 25% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Salt Lake City (SLC) offer the lowest average round-trip price of $624.

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 January 2026, 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.

$268 Cheap Flights from Ontario to London in 2026

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Find the cheapest flights from Ontario to London

Round-trip

One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

10:58 am - 10:00 am

ONT

LHR

15h 02m1 stop

8:50 pm - 10:48 pm

LHR

ONT

33h 58m2 stops

$579Iberia

Tue, Jan 27 - Thu, Feb 5

4:52 pm - 3:05 pm

ONT

LHR

14h 13m1 stop

6:10 am - 6:37 pm

LHR

ONT

20h 27m2 stops

$584British Airways

Wed, Apr 15 - Tue, May 5

3:09 pm - 12:15 pm

ONT

LHR

13h 06m1 stop

4:30 pm - 11:59 pm

LHR

ONT

15h 29m1 stop

$589British Airways

Tue, Feb 3 - Thu, Feb 19

10:58 am - 8:35 am

ONT

LHR

13h 37m1 stop

11:45 am - 7:45 pm

LHR

ONT

16h 00m1 stop

$590British Airways

Tue, Jan 20 - Tue, Feb 17

7:30 am - 10:30 am

ONT

LHR

19h 00m1 stop

12:20 pm - 10:37 pm

LHR

ONT

18h 17m1 stop

$595Virgin Atlantic

Sun, Feb 22 - Sun, Mar 1

10:20 pm - 7:50 am

ONT

LHR

25h 30m1 stop

8:25 pm - 9:05 pm

LHR

ONT

32h 40m2 stops

$597KLM

Sun, Feb 22 - Sun, Mar 1

1:11 pm - 10:00 am

ONT

LHR

12h 49m1 stop

6:20 am - 10:37 pm

LHR

ONT

24h 17m2 stops

$602Virgin Atlantic

Wed, Feb 4 - Fri, Feb 27

10:56 am - 7:00 pm

ONT

LGW

24h 04m2 stops

11:45 am - 10:06 am

LGW

ONT

30h 21m2 stops

$654Iberia

Mon, Feb 23 - Mon, Mar 2

12:41 pm - 4:35 pm

ONT

LCY

19h 54m2 stops

8:40 am - 9:05 pm

LCY

ONT

20h 25m2 stops

$661Delta

Wed, Feb 4 - Fri, Feb 27

6:00 am - 9:30 am

ONT

LCY

19h 30m2 stops

10:00 am - 10:37 pm

LCY

ONT

20h 37m2 stops

$675Delta

Tue, Mar 31 - Wed, Apr 29

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

Iberia

Jan 27

ONT10:58 amOntario

15h 02m

1 stop

LHR10:00 amLondon Heathrow

Feb 5

LHR8:50 pmLondon Heathrow

33h 58m

2 stops

ONT10:48 pmOntario

$579

Iberia

Feb 19

ONT10:56 amOntario

13h 19m

1 stop

LHR8:15 amLondon Heathrow

Feb 24

LHR3:00 pmLondon Heathrow

15h 49m

1 stop

ONT10:49 pmOntario

$634

Iberia

Feb 23

ONT10:56 amOntario

24h 04m

2 stops

LGW7:00 pmLondon Gatwick

Mar 2

LGW11:45 amLondon Gatwick

30h 21m

2 stops

ONT10:06 amOntario

$654

British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets

British Airways

Apr 15

ONT4:52 pmOntario

14h 13m

1 stop

LHR3:05 pmLondon Heathrow

May 5

LHR6:10 amLondon Heathrow

20h 27m

2 stops

ONT6:37 pmOntario

$584

British Airways

Feb 3

ONT4:45 pmOntario

12h 30m

1 stop

LHR1:15 pmLondon Heathrow

Feb 17

LHR11:45 amLondon Heathrow

16h 00m

1 stop

ONT7:45 pmOntario

$589

British Airways

Feb 1

ONT3:09 pmOntario

13h 06m

1 stop

LHR12:15 pmLondon Heathrow

Feb 12

LHR4:30 pmLondon Heathrow

15h 29m

1 stop

ONT11:59 pmOntario

$590

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 1/27

10:58 am-10:00 am

1 stop15h 02m

London Heathrow

Thu 2/5

8:50 pm-10:48 pm

2 stops33h 58m

$579

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 4/15

4:52 pm-3:05 pm

1 stop14h 13m

London Heathrow

Tue 5/5

6:10 am-6:37 pm

2 stops20h 27m

$584

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 2/3

3:09 pm-12:15 pm

1 stop13h 06m

London Heathrow

Thu 2/19

4:30 pm-11:59 pm

1 stop15h 29m

$589

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 1/20

10:58 am-8:35 am

1 stop13h 37m

London Heathrow

Tue 2/17

11:45 am-7:45 pm

1 stop16h 00m

$590

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 2/22

7:30 am-10:30 am

1 stop19h 00m

London Heathrow

Sun 3/1

12:20 pm-10:37 pm

1 stop18h 17m

$595

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 2/22

10:20 pm-7:50 am

1 stop25h 30m

London Heathrow

Sun 3/1

8:25 pm-9:05 pm

2 stops32h 40m

$597

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 2/4

1:11 pm-10:00 am

1 stop12h 49m

London Heathrow

Fri 2/27

6:20 am-10:37 pm

2 stops24h 17m

$602

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 2/23

10:56 am-7:00 pm

2 stops24h 04m

London Gatwick

Mon 3/2

11:45 am-10:06 am

2 stops30h 21m

$654

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Wed 2/4

12:41 pm-4:35 pm

2 stops19h 54m

London City

Fri 2/27

8:40 am-9:05 pm

2 stops20h 25m

$661

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Tue 3/31

6:00 am-9:30 am

2 stops19h 30m

London City

Wed 4/29

10:00 am-10:37 pm

2 stops20h 37m

$675

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 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 $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 $679.

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 $745. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $839. 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 $761 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $811. 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 $848 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 30m
Direct flights	None

The fastest flight from Ontario to London takes 12h 30m

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

Search flight deals

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 30m.
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 January 2026, 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 27% of all bookings. The subsequent popular airlines are British Airways at 24%, Delta at 20%, and American Airlines at 15%.

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
Virgin Atlantic	PriceFrom $469	Free Cancellation	Rating 7.5 678 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.9 8,034 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.7 1,434 reviews	Search KLM flights
Iberia	PriceFrom $615	Free Cancellation	Rating 7.0 3,081 reviews	Search Iberia flights
American Airlines	PriceFrom $624	Free Cancellation	Rating 7.2 11,105 reviews	Search American Airlines flights
British Airways	PriceFrom $647	Free Cancellation	Rating 6.7 7,665 reviews	Search British Airways flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 9,146 reviews	Search United Airlines flights

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Luton

Hounslow

Milton Keynes

Dover

Slough

Guildford

Hayes

Crawley

Dartford

Brentwood

Watford

Wembley

Cobham

Folkestone

Romford

Richmond

Uxbridge

Chelmsford

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.