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?

Alaska Airlines, British Airways, and Iberia are the most popular carriers operating from Ontario to London

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 46% 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 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 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 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.

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 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.

$208 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 $1,084 to $1,496. The lowest price recently found on this route was $814.

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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.

12:46 pm - 10:00 am

ONT

LHR

13h 14m

1 stop

2:45 pm - 10:19 pm

LHR

ONT

15h 34m

1 stop

$814British Airways

Sun, Nov 15 - Wed, Dec 16

6:00 am - 8:15 am

ONT

LHR

19h 15m

1 stop

7:40 pm - 9:57 am

LHR

ONT

22h 17m

2 stops

$817Multiple Airlines

Sun, Oct 25 - Wed, Nov 4

7:20 am - 10:00 am

ONT

LHR

19h 40m

1 stop

10:15 am - 6:22 pm

LHR

ONT

16h 07m

1 stop

$819British Airways

Sun, Oct 25 - Wed, Nov 4

11:13 am - 3:05 pm

ONT

LHR

19h 52m

1 stop

4:10 pm - 9:54 pm

LHR

ONT

13h 44m

1 stop

$820Multiple Airlines

Tue, Oct 6 - Mon, Oct 12

11:13 am - 3:05 pm

ONT

LHR

19h 52m

1 stop

2:45 pm - 11:52 pm

LHR

ONT

16h 07m

1 stop

$821Multiple Airlines

Tue, Oct 20 - Mon, Oct 26

12:00 pm - 3:45 pm

ONT

LGW

19h 45m

2 stops

10:00 am - 10:43 pm

LGW

ONT

20h 43m

2 stops

$874Delta

Wed, Dec 2 - Wed, Dec 9

6:20 am - 9:30 am

ONT

LCY

19h 10m

2 stops

9:20 am - 10:43 pm

LCY

ONT

21h 23m

2 stops

$941Delta

Thu, Oct 8 - Thu, Oct 15

10:47 am - 2:05 pm

ONT

LCY

19h 18m

2 stops

7:50 am - 10:19 pm

LCY

ONT

22h 29m

2 stops

$947Iberia

Wed, Dec 2 - Wed, Dec 9

1:56 pm - 1:45 pm

ONT

LCY

39h 49m

2 stops

9:15 am - 8:01 pm

LCY

ONT

18h 46m

2 stops

$1,164SWISS

Fri, Aug 14 - Fri, Aug 21

10:29 am - 3:15 pm

ONT

LCY

20h 46m

2 stops

9:50 am - 10:59 pm

LCY

ONT

21h 09m

2 stops

$1,170Iberia

Thu, Aug 20 - Thu, Sep 3

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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Alaska Airlines

Sep 6

ONT3:07 pmOntario

15h 58m

1 stop

LHR3:05 pmLondon Heathrow

Oct 9

LHR5:00 pmLondon Heathrow

14h 45m

1 stop

ONT11:45 pmOntario

$848

Alaska Airlines

Oct 6

ONT2:13 pmOntario

16h 52m

1 stop

LHR3:05 pmLondon Heathrow

Oct 14

LHR5:00 pmLondon Heathrow

14h 45m

1 stop

ONT11:45 pmOntario

$874

Alaska Airlines

Sep 27

ONT6:02 amOntario

25h 03m

1 stop

LHR3:05 pmLondon Heathrow

Oct 7

LHR5:00 pmLondon Heathrow

14h 45m

1 stop

ONT11:45 pmOntario

$879

Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets

Delta

Oct 6

ONT7:05 amOntario

16h 05m

2 stops

LHR7:10 amLondon Heathrow

Oct 13

LHR6:30 amLondon Heathrow

18h 42m

2 stops

ONT5:12 pmOntario

$867

Delta

Dec 2

ONT12:00 pmOntario

19h 45m

2 stops

LGW3:45 pmLondon Gatwick

Dec 9

LGW10:00 amLondon Gatwick

20h 43m

2 stops

ONT10:43 pmOntario

$874

Delta

Oct 5

ONT9:52 amOntario

16h 08m

1 stop

LHR10:00 amLondon Heathrow

Oct 16

LHR10:45 amLondon Heathrow

19h 16m

2 stops

ONT10:01 pmOntario

$897

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 11/15

12:46 pm-10:00 am

1 stop13h 14m

London Heathrow

Wed 12/16

2:45 pm-10:19 pm

1 stop15h 34m

$814

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 10/25

6:00 am-8:15 am

1 stop19h 15m

London Heathrow

Wed 11/4

7:40 pm-9:57 am

2 stops22h 17m

$817

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 10/25

7:20 am-10:00 am

1 stop19h 40m

London Heathrow

Wed 11/4

10:15 am-6:22 pm

1 stop16h 07m

$819

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/6

11:13 am-3:05 pm

1 stop19h 52m

London Heathrow

Mon 10/12

4:10 pm-9:54 pm

1 stop13h 44m

$820

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/20

11:13 am-3:05 pm

1 stop19h 52m

London Heathrow

Mon 10/26

2:45 pm-11:52 pm

1 stop16h 07m

$821

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 12/2

12:00 pm-3:45 pm

2 stops19h 45m

London Gatwick

Wed 12/9

10:00 am-10:43 pm

2 stops20h 43m

$874

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Thu 10/8

6:20 am-9:30 am

2 stops19h 10m

London City

Thu 10/15

9:20 am-10:43 pm

2 stops21h 23m

$941

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Wed 12/2

10:47 am-2:05 pm

2 stops19h 18m

London City

Wed 12/9

7:50 am-10:19 pm

2 stops22h 29m

$947

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Fri 8/14

1:56 pm-1:45 pm

2 stops39h 49m

London City

Fri 8/21

9:15 am-8:01 pm

2 stops18h 46m

$1,164

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Thu 8/20

10:29 am-3:15 pm

2 stops20h 46m

London City

Thu 9/3

9:50 am-10:59 pm

2 stops21h 09m

$1,170

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 $792. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $935. 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 $655 when looking at flights departing at noon. Flights to London are more costly in the afternoon, with an average ticket price of $888. 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 21% 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 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 53% of all bookings. The subsequent popular airlines are British Airways at 30% 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 $570	Free Cancellation	Rating 7.8 8,452 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.8 1,532 reviews	Search KLM flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,766 reviews	Search American Airlines flights
British Airways	PriceFrom $624	Free Cancellation	Rating 6.7 8,087 reviews	Search British Airways flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 9,915 reviews	Search United Airlines flights

Hounslow

Gatwick

Milton Keynes

Luton

Hayes

Dover

Crawley

Croydon

Wembley

Stansted

Harrow

Slough

Watford

Ilford

Cobham

Brentwood

Folkestone

Guildford

Romford

Uxbridge

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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Fly into one of these airports located in London

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Cheap flights from Ontario to London from $208

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 11/18. 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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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Delta flights from Ontario to London

Our best Delta 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

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

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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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