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

Denver (DEN) was the most common stop: 40% of momondo users choosing 1-stop flights on this route connected there.

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

United Airlines, British Airways, and Air Canada 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 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.

$310 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 $643 to $813. The lowest price recently found on this route was $587.

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Ontario to London

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:40 am - 12:50 pmONT-LHR

22h 10m1 stop

2:45 pm - 10:47 pmLHR-ONT

16h 02m1 stop

$587Virgin Atlantic

Find Deal

Tue, Dec 2 - Tue, Dec 16

6:40 am - 12:50 pmONT-LHR

22h 10m1 stop

2:45 pm - 10:47 pmLHR-ONT

16h 02m1 stop

$588Virgin Atlantic

Find Deal

Tue, Dec 2 - Tue, Dec 16

6:00 am - 6:50 amONT-LHR

16h 50m2 stops

11:05 am - 11:58 pmLHR-ONT

20h 53m2 stops

$589Virgin Atlantic

Find Deal

Tue, Dec 9 - Tue, Dec 16

1:29 pm - 10:00 amONT-LHR

12h 31m1 stop

11:05 am - 11:58 pmLHR-ONT

20h 53m2 stops

$594Virgin Atlantic

Find Deal

Tue, Dec 9 - Tue, Dec 16

7:30 am - 12:50 pmONT-LHR

21h 20m1 stop

10:45 am - 4:13 pmLHR-ONT

13h 28m1 stop

$595Virgin Atlantic

Find Deal

Mon, Jan 5 - Tue, Jan 20

3:30 pm - 12:50 pmONT-LHR

13h 20m1 stop

8:40 am - 9:07 pmLHR-ONT

20h 27m2 stops

$616Delta

Find Deal

Mon, Jan 5 - Tue, Jan 20

1:00 pm - 4:40 pmONT-LCY

19h 40m2 stops

10:00 am - 10:40 pmLCY-ONT

20h 40m2 stops

$703Delta

Find Deal

Sun, Apr 12 - Thu, Apr 23

6:15 am - 9:00 amONT-LGW

18h 45m2 stops

12:30 pm - 5:49 pmLGW-ONT

36h 19m2 stops

$897American Airlines

Find Deal

Wed, Mar 4 - Sun, Mar 8

10:47 am - 2:35 pmONT-LCY

19h 48m2 stops

7:50 am - 11:55 pmLCY-ONT

24h 05m2 stops

$1,136Iberia

Find Deal

Mon, Dec 1 - Thu, Dec 4

10:47 am - 2:35 pmONT-LCY

19h 48m2 stops

7:15 pm - 2:18 pmLCY-ONT

51h 03m2 stops

$1,187British Airways

Find Deal

Sun, Dec 14 - Thu, Jan 8

Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets

Delta

Jan 5

ONT3:30 pmOntario

13h 20m

1 stop

LHR12:50 pmLondon Heathrow

Jan 20

LHR8:40 amLondon Heathrow

20h 27m

2 stops

ONT9:07 pmOntario

$616

Find similar

Delta

Nov 18

ONT11:48 amOntario

17h 02m

1 stop

LHR12:50 pmLondon Heathrow

Nov 27

LHR6:20 amLondon Heathrow

19h 44m

2 stops

ONT6:04 pmOntario

$618

Find similar

Delta

Dec 3

ONT6:00 amOntario

20h 00m

1 stop

LHR10:00 amLondon Heathrow

Dec 8

LHR11:45 amLondon Heathrow

36h 24m

2 stops

ONT4:09 pmOntario

$620

Find similar

Air Canada flights from Ontario to London

Our best Air Canada deals on Ontario to London flight tickets

Air Canada

Jan 5

ONT1:40 pmOntario

56h 50m

2 stops

LHR6:30 amLondon Heathrow

Jan 20

LHR2:30 pmLondon Heathrow

35h 13m

2 stops

ONT5:43 pmOntario

$622

Find similar

Air Canada

Feb 13

ONT5:00 amOntario

19h 30m

2 stops

LHR8:30 amLondon Heathrow

Feb 24

LHR2:30 pmLondon Heathrow

30h 08m

2 stops

ONT12:38 pmOntario

$638

Find similar

Air Canada

Dec 3

ONT5:05 amOntario

18h 05m

2 stops

LHR7:10 amLondon Heathrow

Dec 9

LHR1:25 pmLondon Heathrow

31h 07m

2 stops

ONT12:32 pmOntario

$667

Find similar

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/2

6:40 am-12:50 pm

1 stop22h 10m

London Heathrow

Tue 12/16

2:45 pm-10:47 pm

1 stop16h 02m

$587

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/2

6:40 am-12:50 pm

1 stop22h 10m

London Heathrow

Tue 12/16

2:45 pm-10:47 pm

1 stop16h 02m

$588

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/9

6:00 am-6:50 am

2 stops16h 50m

London Heathrow

Tue 12/16

11:05 am-11:58 pm

2 stops20h 53m

$589

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/9

1:29 pm-10:00 am

1 stop12h 31m

London Heathrow

Tue 12/16

11:05 am-11:58 pm

2 stops20h 53m

$594

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/5

7:30 am-12:50 pm

1 stop21h 20m

London Heathrow

Tue 1/20

10:45 am-4:13 pm

1 stop13h 28m

$595

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/5

3:30 pm-12:50 pm

1 stop13h 20m

London Heathrow

Tue 1/20

8:40 am-9:07 pm

2 stops20h 27m

$616

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Sun 4/12

1:00 pm-4:40 pm

2 stops19h 40m

London City

Thu 4/23

10:00 am-10:40 pm

2 stops20h 40m

$703

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 3/4

6:15 am-9:00 am

2 stops18h 45m

London Gatwick

Sun 3/8

12:30 pm-5:49 pm

2 stops36h 19m

$897

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Mon 12/1

10:47 am-2:35 pm

2 stops19h 48m

London City

Thu 12/4

7:50 am-11:55 pm

2 stops24h 05m

$1,136

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Sun 12/14

10:47 am-2:35 pm

2 stops19h 48m

London City

Thu 1/8

7:15 pm-2:18 pm

2 stops51h 03m

$1,187

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 $778 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $826. 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 $833 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.

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 16m.
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%, American Airlines at 21%, and Delta at 17%.

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 $572	Free Cancellation	Rating 7.9 8,007 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.7 1,411 reviews	Search KLM flights
Iberia	PriceFrom $615	Free Cancellation	Rating 7.0 3,012 reviews	Search Iberia flights
American Airlines	PriceFrom $650	Free Cancellation	Rating 7.2 11,051 reviews	Search American Airlines flights
British Airways	PriceFrom $662	Free Cancellation	Rating 6.7 7,520 reviews	Search British Airways flights
United Airlines	PriceFrom $677	Free Cancellation	Rating 7.4 9,017 reviews	Search United Airlines flights

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Crawley

Brentwood

Chelmsford

Wembley

Folkestone

Romford

Ilford

Cobham

Stansted

Harrow

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.