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 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 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 travel time from Ontario to London?

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

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.

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

British Airways, United Airlines, and Iberia 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 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.

$317 Cheap Flights from Ontario to London in 2026

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 $668 to $810. The lowest price recently found on this route was $622.

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Find the cheapest flights from Ontario to London

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

1:15 pm - 11:40 am

ONT

LHR

14h 25m1 stop

6:30 am - 9:05 pm

LHR

ONT

22h 35m2 stops

$622KLM

Tue, Feb 17 - Tue, Feb 24

5:00 am - 7:10 am

ONT

LHR

18h 10m2 stops

7:40 am - 10:00 pm

LHR

ONT

22h 20m2 stops

$625Multiple Airlines

Mon, Feb 16 - Mon, Feb 23

7:16 am - 11:40 am

ONT

LHR

20h 24m1 stop

6:00 am - 10:49 pm

LHR

ONT

24h 49m2 stops

$629Iberia

Tue, Feb 10 - Tue, Feb 24

1:50 pm - 12:00 pm

ONT

LHR

14h 10m1 stop

7:40 am - 5:41 pm

LHR

ONT

18h 01m2 stops

$630United Airlines

Mon, Feb 16 - Mon, Feb 23

7:30 am - 10:30 am

ONT

LHR

19h 00m1 stop

6:30 am - 5:12 pm

LHR

ONT

17h 42m2 stops

$631KLM

Thu, Mar 5 - Thu, Mar 12

6:00 am - 10:00 am

ONT

LHR

20h 00m1 stop

6:30 am - 9:05 pm

LHR

ONT

22h 35m2 stops

$632Delta

Sat, Jan 31 - Sat, Feb 7

5:05 am - 10:10 am

ONT

LHR

21h 05m2 stops

9:30 am - 10:00 pm

LHR

ONT

20h 30m2 stops

$633Multiple Airlines

Tue, Feb 10 - Tue, Feb 24

6:00 am - 8:45 am

ONT

LHR

18h 45m2 stops

6:30 am - 5:12 pm

LHR

ONT

17h 42m2 stops

$636Delta

Thu, Mar 5 - Thu, Mar 12

7:00 am - 9:00 am

ONT

LGW

19h 00m2 stops

2:30 pm - 10:09 am

LGW

ONT

27h 39m2 stops

$654American Airlines

Wed, Mar 25 - Tue, Apr 7

7:16 am - 10:50 am

ONT

LGW

19h 34m2 stops

7:40 pm - 10:08 am

LGW

ONT

22h 28m2 stops

$706Iberia

Thu, Jan 29 - Mon, Feb 2

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

Iberia

Feb 10

ONT7:16 amOntario

20h 24m

1 stop

LHR11:40 amLondon Heathrow

Feb 24

LHR6:00 amLondon Heathrow

24h 49m

2 stops

ONT10:49 pmOntario

$629

Find similar

Iberia

Feb 3

ONT7:16 amOntario

18h 44m

1 stop

LHR10:00 amLondon Heathrow

Feb 10

LHR6:00 amLondon Heathrow

24h 48m

2 stops

ONT10:48 pmOntario

$679

Find similar

Iberia

Feb 1

ONT10:58 amOntario

15h 02m

1 stop

LHR10:00 amLondon Heathrow

Feb 8

LHR3:00 pmLondon Heathrow

15h 48m

1 stop

ONT10:48 pmOntario

$685

Find similar

United Airlines flights from Ontario to London

Our best United Airlines deals on Ontario to London flight tickets

United Airlines

Feb 16

ONT1:50 pmOntario

14h 10m

1 stop

LHR12:00 pmLondon Heathrow

Feb 23

LHR7:40 amLondon Heathrow

18h 01m

2 stops

ONT5:41 pmOntario

$630

Find similar

United Airlines

Feb 17

ONT1:50 pmOntario

14h 10m

1 stop

LHR12:00 pmLondon Heathrow

Feb 24

LHR9:30 amLondon Heathrow

20h 30m

2 stops

ONT10:00 pmOntario

$641

Find similar

United Airlines

Feb 17

ONT8:00 amOntario

17h 10m

2 stops

LHR9:10 amLondon Heathrow

Feb 24

LHR9:30 amLondon Heathrow

20h 30m

2 stops

ONT10:00 pmOntario

$646

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 2/17

1:15 pm-11:40 am

1 stop14h 25m

London Heathrow

Tue 2/24

6:30 am-9:05 pm

2 stops22h 35m

$622

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 2/16

5:00 am-7:10 am

2 stops18h 10m

London Heathrow

Mon 2/23

7:40 am-10:00 pm

2 stops22h 20m

$625

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 2/10

7:16 am-11:40 am

1 stop20h 24m

London Heathrow

Tue 2/24

6:00 am-10:49 pm

2 stops24h 49m

$629

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 2/16

1:50 pm-12:00 pm

1 stop14h 10m

London Heathrow

Mon 2/23

7:40 am-5:41 pm

2 stops18h 01m

$630

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 3/5

7:30 am-10:30 am

1 stop19h 00m

London Heathrow

Thu 3/12

6:30 am-5:12 pm

2 stops17h 42m

$631

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 1/31

6:00 am-10:00 am

1 stop20h 00m

London Heathrow

Sat 2/7

6:30 am-9:05 pm

2 stops22h 35m

$632

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 2/10

5:05 am-10:10 am

2 stops21h 05m

London Heathrow

Tue 2/24

9:30 am-10:00 pm

2 stops20h 30m

$633

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 3/5

6:00 am-8:45 am

2 stops18h 45m

London Heathrow

Thu 3/12

6:30 am-5:12 pm

2 stops17h 42m

$636

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 3/25

7:00 am-9:00 am

2 stops19h 00m

London Gatwick

Tue 4/7

2:30 pm-10:09 am

2 stops27h 39m

$654

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Thu 1/29

7:16 am-10:50 am

2 stops19h 34m

London Gatwick

Mon 2/2

7:40 pm-10:08 am

2 stops22h 28m

$706

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 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 28% of all bookings. The subsequent popular airlines are British Airways at 24%, Delta at 19%, 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 8,017 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 3,062 reviews	Search Iberia flights
American Airlines	PriceFrom $624	Free Cancellation	Rating 7.2 11,079 reviews	Search American Airlines flights
British Airways	PriceFrom $647	Free Cancellation	Rating 6.7 7,644 reviews	Search British Airways flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 9,138 reviews	Search United Airlines flights

Gatwick

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.