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

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

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.

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 19 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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.

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?

United Airlines, Air Canada, and Delta 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 December 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.

$258 Cheap Flights from Ontario to London in 2025/26

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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

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7:30 am - 10:30 am

ONT

LHR

19h 00m1 stop

6:30 am - 10:51 pm

LHR

ONT

24h 21m2 stops

$605Virgin Atlantic

Thu, Jan 8 - Wed, Jan 21

7:30 am - 10:30 am

ONT

LHR

19h 00m1 stop

10:45 am - 11:58 pm

LHR

ONT

21h 13m1 stop

$618Virgin Atlantic

Thu, Jan 22 - Thu, Jan 29

5:07 pm - 8:10 pm

ONT

LHR

19h 03m2 stops

6:30 am - 10:51 pm

LHR

ONT

24h 21m2 stops

$619Delta

Thu, Jan 8 - Wed, Jan 21

7:10 am - 6:50 am

ONT

LHR

15h 40m1 stop

6:05 am - 10:49 pm

LHR

ONT

24h 44m2 stops

$626Iberia

Fri, Feb 13 - Sat, Feb 21

10:30 pm - 6:25 am

ONT

LHR

23h 55m1 stop

6:30 am - 10:51 pm

LHR

ONT

24h 21m2 stops

$629Delta

Wed, Jan 7 - Wed, Jan 14

6:00 am - 10:10 am

ONT

LHR

20h 10m2 stops

6:30 am - 9:58 pm

LHR

ONT

23h 28m2 stops

$630Multiple Airlines

Thu, Jan 15 - Fri, Jan 30

6:39 pm - 7:25 am

ONT

LHR

28h 46m1 stop

7:30 am - 9:59 pm

LHR

ONT

22h 29m2 stops

$631United Airlines

Mon, Jan 5 - Tue, Jan 20

1:24 pm - 9:40 am

ONT

LHR

12h 16m1 stop

9:30 am - 9:59 pm

LHR

ONT

20h 29m2 stops

$639United Airlines

Fri, Jan 30 - Tue, Feb 3

6:27 am - 7:30 am

ONT

LGW

17h 03m2 stops

11:20 am - 12:03 pm

LGW

ONT

32h 43m2 stops

$730American Airlines

Fri, Jan 23 - Fri, Jan 30

6:10 am - 8:50 am

ONT

LCY

18h 40m2 stops

7:50 am - 11:59 pm

LCY

ONT

23h 09m2 stops

$782Iberia

Thu, Mar 5 - Wed, Mar 18

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

Iberia

Feb 13

ONT7:10 amOntario

20h 30m

1 stop

LHR11:40 amLondon Heathrow

Feb 21

LHR6:05 amLondon Heathrow

24h 44m

2 stops

ONT10:49 pmOntario

$626

Find similar

Iberia

Jan 17

ONT10:58 amOntario

16h 42m

1 stop

LHR11:40 amLondon Heathrow

Feb 2

LHR4:30 pmLondon Heathrow

25h 38m

1 stop

ONT10:08 amOntario

$666

Find similar

Iberia

Jan 20

ONT10:58 amOntario

15h 02m

1 stop

LHR10:00 amLondon Heathrow

Jan 29

LHR6:15 amLondon Heathrow

24h 33m

2 stops

ONT10:48 pmOntario

$678

Find similar

Air Canada flights from Ontario to London

Our best Air Canada deals on Ontario to London flight tickets

Air Canada

Mar 4

ONT5:00 amOntario

18h 10m

2 stops

LHR7:10 amLondon Heathrow

Mar 9

LHR2:30 pmLondon Heathrow

28h 48m

2 stops

ONT12:18 pmOntario

$636

Find similar

Air Canada

Feb 13

ONT5:00 amOntario

19h 30m

2 stops

LHR8:30 amLondon Heathrow

Feb 21

LHR6:00 pmLondon Heathrow

36h 57m

2 stops

ONT10:57 pmOntario

$646

Find similar

Air Canada

Jan 6

ONT6:32 pmOntario

27h 58m

2 stops

LHR6:30 amLondon Heathrow

Jan 22

LHR6:00 pmLondon Heathrow

31h 43m

2 stops

ONT5:43 pmOntario

$680

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/8

7:30 am-10:30 am

1 stop19h 00m

London Heathrow

Wed 1/21

6:30 am-10:51 pm

2 stops24h 21m

$605

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/22

7:30 am-10:30 am

1 stop19h 00m

London Heathrow

Thu 1/29

10:45 am-11:58 pm

1 stop21h 13m

$618

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/8

5:07 pm-8:10 pm

2 stops19h 03m

London Heathrow

Wed 1/21

6:30 am-10:51 pm

2 stops24h 21m

$619

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 2/13

7:10 am-6:50 am

1 stop15h 40m

London Heathrow

Sat 2/21

6:05 am-10:49 pm

2 stops24h 44m

$626

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 1/7

10:30 pm-6:25 am

1 stop23h 55m

London Heathrow

Wed 1/14

6:30 am-10:51 pm

2 stops24h 21m

$629

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 1/15

6:00 am-10:10 am

2 stops20h 10m

London Heathrow

Fri 1/30

6:30 am-9:58 pm

2 stops23h 28m

$630

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/5

6:39 pm-7:25 am

1 stop28h 46m

London Heathrow

Tue 1/20

7:30 am-9:59 pm

2 stops22h 29m

$631

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 1/30

1:24 pm-9:40 am

1 stop12h 16m

London Heathrow

Tue 2/3

9:30 am-9:59 pm

2 stops20h 29m

$639

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Fri 1/23

6:27 am-7:30 am

2 stops17h 03m

London Gatwick

Fri 1/30

11:20 am-12:03 pm

2 stops32h 43m

$730

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Thu 3/5

6:10 am-8:50 am

2 stops18h 40m

London City

Wed 3/18

7:50 am-11:59 pm

2 stops23h 09m

$782

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 $657, 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 $751. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $845. 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 $769 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $818. 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 $828 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.

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 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 December 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 27% of all bookings. The subsequent popular airlines are British Airways at 24%, Delta at 19%, and American Airlines at 16%.

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 7.5 675 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $570	Free Cancellation	Rating 7.9 8,009 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.7 1,432 reviews	Search KLM flights
Iberia	PriceFrom $615	Free Cancellation	Rating 7.0 3,045 reviews	Search Iberia flights
American Airlines	PriceFrom $624	Free Cancellation	Rating 7.2 11,049 reviews	Search American Airlines flights
British Airways	PriceFrom $653	Free Cancellation	Rating 6.7 7,571 reviews	Search British Airways flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 9,095 reviews	Search United Airlines flights

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Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Crawley

Brentwood

Wembley

Romford

Watford

Ilford

Cobham

Folkestone

Uxbridge

Stansted

Chelmsford

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.