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.

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 connection time from Ontario to London?

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

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.

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

JetBlue, Air Canada, and British Airways are the most popular carriers operating from Ontario to London

What airlines fly to London?

British Airways, Iberia and Virgin Atlantic 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.

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 October 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.

$388 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 $623 to $695. The lowest price recently found on this route was $588.

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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.

1:20 pm - 10:00 amONT-LHR

12h 40m1 stop

10:45 am - 11:58 pmLHR-ONT

21h 13m1 stop

$588Virgin Atlantic

Find Deal

Tue, Dec 2 - Tue, Dec 16

6:00 am - 10:00 amONT-LHR

20h 00m1 stop

10:45 am - 11:58 pmLHR-ONT

21h 13m1 stop

$589Virgin Atlantic

Find Deal

Tue, Dec 2 - Tue, Dec 16

11:48 am - 12:50 pmONT-LHR

17h 02m1 stop

6:20 am - 5:09 pmLHR-ONT

18h 49m2 stops

$621Delta

Find Deal

Tue, Nov 18 - Tue, Nov 25

6:00 am - 7:05 amONT-LHR

17h 05m2 stops

6:20 am - 5:09 pmLHR-ONT

18h 49m2 stops

$625Delta

Find Deal

Tue, Nov 18 - Tue, Nov 25

12:46 pm - 10:00 amONT-LHR

13h 14m1 stop

4:30 pm - 11:57 pmLHR-ONT

15h 27m1 stop

$643British Airways

Find Deal

Tue, Nov 4 - Fri, Nov 21

4:47 pm - 1:15 pmONT-LHR

12h 28m1 stop

10:15 am - 6:45 pmLHR-ONT

16h 30m1 stop

$651British Airways

Find Deal

Mon, Jan 5 - Wed, Jan 14

1:34 pm - 9:40 amONT-LHR

12h 06m1 stop

9:30 am - 8:42 pmLHR-ONT

19h 12m2 stops

$660United Airlines

Find Deal

Wed, Dec 3 - Thu, Dec 11

5:05 am - 5:55 amONT-LHR

16h 50m2 stops

9:10 am - 10:49 pmLHR-ONT

21h 39m3 stops

$667United Airlines

Find Deal

Tue, Dec 2 - Tue, Dec 16

5:03 pm - 1:15 pmONT-LHR

12h 12m1 stop

4:30 pm - 11:43 pmLHR-ONT

15h 13m1 stop

$682American Airlines

Find Deal

Fri, Feb 13 - Fri, Feb 20

6:47 am - 9:00 amONT-LGW

18h 13m2 stops

12:30 pm - 5:49 pmLGW-ONT

36h 19m2 stops

$849American Airlines

Find Deal

Wed, Mar 4 - Sun, Mar 8

Virgin Atlantic flights from Ontario to London

Our best Virgin Atlantic deals on Ontario to London flight tickets

Virgin Atlantic

Dec 2

ONT1:20 pmOntario

12h 40m

1 stop

LHR10:00 amLondon Heathrow

Dec 16

LHR10:45 amLondon Heathrow

21h 13m

1 stop

ONT11:58 pmOntario

$588

Find similar

Virgin Atlantic

Dec 2

ONT6:00 amOntario

20h 00m

1 stop

LHR10:00 amLondon Heathrow

Dec 16

LHR10:45 amLondon Heathrow

21h 13m

1 stop

ONT11:58 pmOntario

$589

Find similar

Virgin Atlantic

Jan 5

ONT6:45 amOntario

22h 05m

1 stop

LHR12:50 pmLondon Heathrow

Jan 20

LHR10:45 amLondon Heathrow

21h 07m

1 stop

ONT11:52 pmOntario

$597

Find similar

Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets

Delta

Nov 18

ONT11:48 amOntario

17h 02m

1 stop

LHR12:50 pmLondon Heathrow

Nov 25

LHR6:20 amLondon Heathrow

18h 49m

2 stops

ONT5:09 pmOntario

$621

Find similar

Delta

Nov 18

ONT6:00 amOntario

17h 05m

2 stops

LHR7:05 amLondon Heathrow

Nov 25

LHR6:20 amLondon Heathrow

18h 49m

2 stops

ONT5:09 pmOntario

$625

Find similar

Delta

Nov 18

ONT5:49 pmOntario

18h 21m

2 stops

LHR8:10 pmLondon Heathrow

Nov 24

LHR11:45 amLondon Heathrow

44h 07m

2 stops

ONT11:52 pmOntario

$627

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/2

1:20 pm-10:00 am

1 stop12h 40m

London Heathrow

Tue 12/16

10:45 am-11:58 pm

1 stop21h 13m

$588

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/2

6:00 am-10:00 am

1 stop20h 00m

London Heathrow

Tue 12/16

10:45 am-11:58 pm

1 stop21h 13m

$589

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/18

11:48 am-12:50 pm

1 stop17h 02m

London Heathrow

Tue 11/25

6:20 am-5:09 pm

2 stops18h 49m

$621

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/18

6:00 am-7:05 am

2 stops17h 05m

London Heathrow

Tue 11/25

6:20 am-5:09 pm

2 stops18h 49m

$625

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/4

12:46 pm-10:00 am

1 stop13h 14m

London Heathrow

Fri 11/21

4:30 pm-11:57 pm

1 stop15h 27m

$643

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/5

4:47 pm-1:15 pm

1 stop12h 28m

London Heathrow

Wed 1/14

10:15 am-6:45 pm

1 stop16h 30m

$651

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 12/3

1:34 pm-9:40 am

1 stop12h 06m

London Heathrow

Thu 12/11

9:30 am-8:42 pm

2 stops19h 12m

$660

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/2

5:05 am-5:55 am

2 stops16h 50m

London Heathrow

Tue 12/16

9:10 am-10:49 pm

3 stops21h 39m

$667

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 2/13

5:03 pm-1:15 pm

1 stop12h 12m

London Heathrow

Fri 2/20

4:30 pm-11:43 pm

1 stop15h 13m

$682

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 3/4

6:47 am-9:00 am

2 stops18h 13m

London Gatwick

Sun 3/8

12:30 pm-5:49 pm

2 stops36h 19m

$849

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 $678, 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 $759. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $863. 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 morning, with an average ticket price of $1,321. Departure times in the morning 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 $862 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

Direct flights	None

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 October 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 28% of all bookings. The subsequent popular airlines are American Airlines at 21%, British Airways at 20%, and Delta at 19%.

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 7.5 670 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $572	Free Cancellation	Rating 7.9 7,982 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.7 1,404 reviews	Search KLM flights
Iberia	PriceFrom $615	Free Cancellation	Rating 7.0 2,994 reviews	Search Iberia flights
American Airlines	PriceFrom $653	Free Cancellation	Rating 7.2 11,040 reviews	Search American Airlines flights
British Airways	PriceFrom $662	Free Cancellation	Rating 6.7 7,457 reviews	Search British Airways flights
United Airlines	PriceFrom $677	Free Cancellation	Rating 7.4 8,982 reviews	Search United Airlines flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Guildford

Dartford

Crawley

Hayes

Brentwood

Chelmsford

Colchester

Folkestone

Romford

Ilford

Cobham

Wembley

Stansted

Watford

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.