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

United Airlines, Delta, and British Airways 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.

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.

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 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 45% 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.

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 July 2026, 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.

$280 Cheap Flights from Ontario to London in 2026

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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.

9:00 am - 11:50 am

ONT

LHR

18h 50m

2 stops

2:45 pm - 2:47 pm

LHR

ONT

32h 02m

1 stop

$798Multiple Airlines

Mon, Nov 23 - Fri, Dec 4

12:42 pm - 10:00 am

ONT

LHR

13h 18m

1 stop

2:45 pm - 10:54 pm

LHR

ONT

16h 09m

1 stop

$801Multiple Airlines

Tue, Nov 3 - Tue, Nov 17

12:00 pm - 12:20 pm

ONT

LHR

16h 20m

1 stop

2:45 pm - 10:39 pm

LHR

ONT

15h 54m

1 stop

$804Alaska Airlines

Sun, Jan 10 - Sat, Jan 16

12:00 pm - 12:20 pm

ONT

LHR

16h 20m

1 stop

2:45 pm - 3:05 pm

LHR

ONT

32h 20m

1 stop

$807Alaska Airlines

Wed, Nov 18 - Wed, Nov 25

1:17 pm - 4:40 pm

ONT

LCY

19h 23m

2 stops

10:00 am - 10:43 pm

LCY

ONT

20h 43m

2 stops

$933Delta

Wed, Oct 7 - Thu, Oct 15

6:20 am - 9:25 am

ONT

LGW

19h 05m

2 stops

10:25 am - 10:40 pm

LGW

ONT

20h 15m

2 stops

$951Delta

Tue, Sep 1 - Wed, Sep 16

2:27 pm - 8:00 pm

ONT

LGW

21h 33m

2 stops

11:30 am - 10:59 pm

LGW

ONT

19h 29m

2 stops

$986Iberia

Tue, Aug 25 - Tue, Sep 1

2:43 pm - 8:00 pm

ONT

LGW

21h 17m

2 stops

11:30 am - 10:59 pm

LGW

ONT

19h 29m

2 stops

$1,047Iberia

Sat, Aug 22 - Sat, Aug 29

2:22 pm - 2:05 pm

ONT

LCY

40h 43m

2 stops

7:50 am - 9:40 am

LCY

ONT

33h 50m

2 stops

$1,134British Airways

Tue, Oct 27 - Wed, Nov 4

10:29 am - 3:15 pm

ONT

LCY

20h 46m

2 stops

9:50 am - 10:59 pm

LCY

ONT

21h 09m

2 stops

$1,241British Airways

Thu, Aug 20 - Thu, Aug 27

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British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets

British Airways

Nov 18

ONT12:42 pmOntario

13h 18m

1 stop

LHR10:00 amLondon Heathrow

Nov 28

LHR1:15 pmLondon Heathrow

13h 50m

1 stop

ONT7:05 pmOntario

$826

British Airways

Nov 24

ONT10:30 amOntario

13h 45m

1 stop

LHR8:15 amLondon Heathrow

Dec 1

LHR1:50 pmLondon Heathrow

15h 49m

1 stop

ONT9:39 pmOntario

$827

British Airways

Nov 10

ONT2:22 pmOntario

13h 38m

1 stop

LHR12:00 pmLondon Heathrow

Nov 29

LHR1:15 pmLondon Heathrow

13h 50m

1 stop

ONT7:05 pmOntario

$828

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

Iberia

Nov 1

ONT6:00 amOntario

24h 20m

2 stops

LHR2:20 pmLondon Heathrow

Nov 30

LHR3:00 pmLondon Heathrow

26h 51m

2 stops

ONT9:51 amOntario

$830

Iberia

Oct 26

ONT7:00 amOntario

20h 00m

1 stop

LHR10:00 amLondon Heathrow

Nov 3

LHR6:05 amLondon Heathrow

20h 42m

2 stops

ONT6:47 pmOntario

$866

Iberia

Nov 23

ONT6:00 amOntario

16h 50m

1 stop

LHR6:50 amLondon Heathrow

Dec 4

LHR7:30 amLondon Heathrow

22h 49m

2 stops

ONT10:19 pmOntario

$867

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 11/23

9:00 am-11:50 am

2 stops18h 50m

London Heathrow

Fri 12/4

2:45 pm-2:47 pm

1 stop32h 02m

$798

Quickest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/3

12:42 pm-10:00 am

1 stop13h 18m

London Heathrow

Tue 11/17

2:45 pm-10:54 pm

1 stop16h 09m

$801

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 1/10

12:00 pm-12:20 pm

1 stop16h 20m

London Heathrow

Sat 1/16

2:45 pm-10:39 pm

1 stop15h 54m

$804

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 11/18

12:00 pm-12:20 pm

1 stop16h 20m

London Heathrow

Wed 11/25

2:45 pm-3:05 pm

1 stop32h 20m

$807

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Wed 10/7

1:17 pm-4:40 pm

2 stops19h 23m

London City

Thu 10/15

10:00 am-10:43 pm

2 stops20h 43m

$933

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 9/1

6:20 am-9:25 am

2 stops19h 05m

London Gatwick

Wed 9/16

10:25 am-10:40 pm

2 stops20h 15m

$951

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 8/25

2:27 pm-8:00 pm

2 stops21h 33m

London Gatwick

Tue 9/1

11:30 am-10:59 pm

2 stops19h 29m

$986

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Sat 8/22

2:43 pm-8:00 pm

2 stops21h 17m

London Gatwick

Sat 8/29

11:30 am-10:59 pm

2 stops19h 29m

$1,047

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Tue 10/27

2:22 pm-2:05 pm

2 stops40h 43m

London City

Wed 11/4

7:50 am-9:40 am

2 stops33h 50m

$1,134

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Thu 8/20

10:29 am-3:15 pm

2 stops20h 46m

London City

Thu 8/27

9:50 am-10:59 pm

2 stops21h 09m

$1,241

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?

Prices are currently low for flights on this route.

Typical prices usually range from $823 to $1,085.
The lowest price recently found on this route was $798.

What is the cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in March. Flight prices, which tend to average around $652, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Ontario averaging around $676.

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 $818. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $960. 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 $697 when looking at flights departing at noon. Flights to London are more costly in the afternoon, with an average ticket price of $932. Departure times in the afternoon 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 31% 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 22m
Direct flights	None

The fastest flight from Ontario to London takes 12h 22m

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

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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 22m.
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 July 2026, 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 43% of all bookings. The subsequent popular airlines are British Airways at 23%, Virgin Atlantic at 23%, and Delta at 11%.

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
British Airways	PriceFrom $329	Free Cancellation	Rating 6.7 8,132 reviews	Search British Airways flights
Virgin Atlantic	PriceFrom $469	Free Cancellation	Rating 7.5 695 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $535	Free Cancellation	Rating 7.8 8,483 reviews	Search Delta flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,842 reviews	Search American Airlines flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 10,042 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $931	Free Cancellation	Rating 7.9 12,718 reviews	Search Alaska Airlines flights

Hounslow

Gatwick

Milton Keynes

Luton

Hayes

Dover

Crawley

Wembley

Croydon

Stansted

Kingston upon Thames

Watford

Slough

Harrow

Brentwood

Cobham

Romford

Uxbridge

Guildford

Worthing

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.

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Cheap flights from Ontario to London from $280

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 11/11. 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

Our best British Airways deals on Ontario to London flight tickets

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

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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

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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According to popular flight searches on momondo this year

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