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 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 47% of people opting to fly with this airline when traveling to London. Keep in mind that there are 21 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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, Alaska Airlines, and Delta are the most popular carriers operating from Ontario to London

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.

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 May 2026, there are 5 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.

$319 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 $1,442 to $1,176. The lowest price recently found on this route was $783.

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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.

7:06 am - 12:00 pm

ONT

LHR

20h 54m

2 stops

12:00 pm - 10:04 pm

LHR

ONT

18h 04m

1 stop

$783Multiple Airlines

Tue, Aug 25 - Thu, Aug 27

1:31 pm - 10:30 am

ONT

LHR

12h 59m

1 stop

2:25 pm - 9:08 pm

LHR

ONT

14h 43m

1 stop

$861British Airways

Wed, Sep 9 - Wed, Sep 23

10:47 am - 8:15 am

ONT

LHR

13h 28m

1 stop

7:30 am - 11:57 pm

LHR

ONT

24h 27m

2 stops

$862Iberia

Mon, Nov 16 - Thu, Nov 26

10:25 am - 12:50 pm

ONT

LHR

18h 25m

1 stop

11:30 am - 11:06 pm

LHR

ONT

19h 36m

2 stops

$864Iberia

Mon, Sep 14 - Fri, Oct 2

7:00 am - 8:15 am

ONT

LHR

17h 15m

1 stop

6:00 am - 10:23 pm

LHR

ONT

24h 23m

2 stops

$866Iberia

Tue, Nov 3 - Tue, Nov 10

11:45 am - 3:35 pm

ONT

LHR

19h 50m

1 stop

6:30 am - 5:16 pm

LHR

ONT

18h 46m

2 stops

$867KLM

Sun, Aug 23 - Tue, Sep 8

2:27 pm - 6:15 pm

ONT

LHR

19h 48m

2 stops

8:55 am - 9:12 pm

LHR

ONT

20h 17m

1 stop

$869Multiple Airlines

Wed, Aug 26 - Mon, Sep 7

12:55 pm - 3:35 pm

ONT

LHR

18h 40m

2 stops

6:30 am - 4:24 pm

LHR

ONT

17h 54m

2 stops

$871Virgin Atlantic

Mon, Aug 24 - Thu, Aug 27

5:55 pm - 3:35 pm

ONT

LHR

13h 40m

1 stop

6:15 am - 4:14 pm

LHR

ONT

17h 59m

2 stops

$874Delta

Wed, Sep 2 - Tue, Sep 8

9:55 am - 10:45 am

ONT

LHR

16h 50m

2 stops

6:30 am - 5:17 pm

LHR

ONT

18h 47m

2 stops

$875Delta

Mon, Nov 2 - Tue, Nov 10

British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets

British Airways

Sep 9

ONT1:31 pmOntario

12h 59m

1 stop

LHR10:30 amLondon Heathrow

Sep 23

LHR2:25 pmLondon Heathrow

14h 43m

1 stop

ONT9:08 pmOntario

$861

British Airways

Nov 16

ONT2:59 pmOntario

13h 01m

1 stop

LHR12:00 pmLondon Heathrow

Nov 24

LHR10:15 amLondon Heathrow

16h 07m

1 stop

ONT6:22 pmOntario

$862

British Airways

Aug 23

ONT2:27 pmOntario

13h 43m

1 stop

LHR12:10 pmLondon Heathrow

Sep 7

LHR11:00 amLondon Heathrow

15h 15m

1 stop

ONT6:15 pmOntario

$878

Air Canada flights from Ontario to London

Our best Air Canada deals on Ontario to London flight tickets

Air Canada

Oct 17

ONT6:32 pmOntario

27h 58m

2 stops

LHR6:30 amLondon Heathrow

Oct 30

LHR2:30 pmLondon Heathrow

28h 50m

2 stops

ONT12:20 pmOntario

$903

Air Canada

Aug 23

ONT5:00 amOntario

17h 35m

2 stops

LHR6:35 amLondon Heathrow

Sep 8

LHR2:05 pmLondon Heathrow

38h 48m

2 stops

ONT8:53 pmOntario

$911

Air Canada

Aug 23

ONT5:00 amOntario

17h 35m

2 stops

LHR6:35 amLondon Heathrow

Sep 8

LHR2:05 pmLondon Heathrow

38h 48m

2 stops

ONT8:53 pmOntario

$912

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 8/25

7:06 am-12:00 pm

2 stops20h 54m

London Heathrow

Thu 8/27

12:00 pm-10:04 pm

1 stop18h 04m

$783

Quickest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 9/9

1:31 pm-10:30 am

1 stop12h 59m

London Heathrow

Wed 9/23

2:25 pm-9:08 pm

1 stop14h 43m

$861

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 11/16

10:47 am-8:15 am

1 stop13h 28m

London Heathrow

Thu 11/26

7:30 am-11:57 pm

2 stops24h 27m

$862

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 9/14

10:25 am-12:50 pm

1 stop18h 25m

London Heathrow

Fri 10/2

11:30 am-11:06 pm

2 stops19h 36m

$864

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/3

7:00 am-8:15 am

1 stop17h 15m

London Heathrow

Tue 11/10

6:00 am-10:23 pm

2 stops24h 23m

$866

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 8/23

11:45 am-3:35 pm

1 stop19h 50m

London Heathrow

Tue 9/8

6:30 am-5:16 pm

2 stops18h 46m

$867

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 8/26

2:27 pm-6:15 pm

2 stops19h 48m

London Heathrow

Mon 9/7

8:55 am-9:12 pm

1 stop20h 17m

$869

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 8/24

12:55 pm-3:35 pm

2 stops18h 40m

London Heathrow

Thu 8/27

6:30 am-4:24 pm

2 stops17h 54m

$871

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 9/2

5:55 pm-3:35 pm

1 stop13h 40m

London Heathrow

Tue 9/8

6:15 am-4:14 pm

2 stops17h 59m

$874

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 11/2

9:55 am-10:45 am

2 stops16h 50m

London Heathrow

Tue 11/10

6:30 am-5:17 pm

2 stops18h 47m

$875

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 September. Flight prices, which tend to average around $251, are often lower during this time because this is during the off-season. The month of December is another great option to travel to London, with average flight prices from Ontario averaging around $282.

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 $756. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $889. 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 $707 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $831. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Ontario to London flights?

You could potentially save up to 45% on your flight if you consider stops on a Ontario to London flight.

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 28m
Direct flights	None

The fastest flight from Ontario to London takes 12h 28m

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

Search flight deals

Frequently asked questions about flying from Ontario to London

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 28m.
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 May 2026, there are 5 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 49% of all bookings. The subsequent popular airlines are British Airways at 31% 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
Delta	PriceFrom $572	Free Cancellation	Rating 7.9 8,434 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.8 1,522 reviews	Search KLM flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,630 reviews	Search American Airlines flights
British Airways	PriceFrom $624	Free Cancellation	Rating 6.7 8,004 reviews	Search British Airways flights
United Airlines	PriceFrom $662	Free Cancellation	Rating 7.4 9,747 reviews	Search United Airlines flights

Hounslow

Gatwick

Milton Keynes

Dover

Luton

Hayes

Crawley

Wembley

Slough

Croydon

Stansted

Watford

Harrow

Brentwood

Dartford

Ilford

Cobham

Folkestone

Uxbridge

Romford

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.

An easier way to manage your London trip

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Fly into one of these airports located in London

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Cheap flights from Ontario to London from $319

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to London departing on 10/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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British Airways flights from Ontario to London

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How to get the cheapest flight ticket from Ontario to London

What is the typical price of a round-trip flight between Ontario and London?

What is the cheapest month to fly to London?

What is the cheapest day to depart on your flight to London?

What is the cheapest time of day to depart on your flight to London?

Can stopping save me money on Ontario to London flights?

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

What airlines fly to London?

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

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

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

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

When to book flights from Ontario to London

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

Direct flights

Frequently asked questions about flying from Ontario to London

Best airlines flying from Ontario to London

Compare and see reviews for airlines that fly from Ontario to London with momondo

Traveling to a place near London?

Why use momondo?

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London

Fly your favorite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo

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