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 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 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.

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.

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

United Airlines, Virgin Atlantic, and JetBlue are the most popular carriers operating from Ontario to London

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 August 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.

$282 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.

6:37 pm - 7:25 am

ONT

LHR

28h 48m

1 stop

6:50 am - 6:47 pm

LHR

ONT

19h 57m

2 stops

$736United Airlines

Mon, Nov 9 - Thu, Nov 12

6:00 am - 9:40 am

ONT

LHR

43h 40m

2 stops

6:50 am - 6:47 pm

LHR

ONT

19h 57m

2 stops

$746United Airlines

Mon, Nov 9 - Thu, Nov 12

6:00 am - 12:20 pm

ONT

LHR

22h 20m

1 stop

2:45 pm - 11:09 am

LHR

ONT

28h 24m

1 stop

$790Alaska Airlines

Wed, Nov 25 - Wed, Dec 2

6:00 am - 12:20 pm

ONT

LHR

22h 20m

1 stop

2:45 pm - 10:54 pm

LHR

ONT

16h 09m

1 stop

$799Alaska Airlines

Sun, Nov 1 - Wed, Nov 11

2:22 pm - 12:00 pm

ONT

LHR

13h 38m

1 stop

2:45 pm - 11:04 pm

LHR

ONT

16h 19m

1 stop

$799Multiple Airlines

Tue, Nov 17 - Tue, Nov 24

3:09 pm - 12:00 pm

ONT

LHR

12h 51m

1 stop

2:45 pm - 10:39 pm

LHR

ONT

14h 54m

1 stop

$799Multiple Airlines

Mon, Jan 18 - Tue, Mar 16

12:42 pm - 10:00 am

ONT

LHR

13h 18m

1 stop

1:15 pm - 7:05 pm

LHR

ONT

13h 50m

1 stop

$824British Airways

Sun, Nov 15 - Mon, Nov 30

12:42 pm - 10:00 am

ONT

LHR

13h 18m

1 stop

1:15 pm - 7:05 pm

LHR

ONT

13h 50m

1 stop

$824British Airways

Tue, Nov 10 - Tue, Nov 24

6:20 am - 10:40 am

ONT

LHR

21h 20m

1 stop

6:30 am - 5:12 pm

LHR

ONT

18h 42m

2 stops

$865Delta

Mon, Oct 26 - Tue, Nov 3

1:24 pm - 1:45 pm

ONT

LHR

17h 21m

2 stops

6:30 am - 5:12 pm

LHR

ONT

18h 42m

2 stops

$869Delta

Mon, Oct 26 - Tue, Nov 3

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JetBlue flights from Ontario to London

Our best JetBlue deals on Ontario to London flight tickets

JetBlue

Aug 22

ONT11:13 pmOntario

13h 32m

1 stop

LHR8:45 pmLondon Heathrow

Sep 8

LHR11:55 amLondon Heathrow

18h 42m

1 stop

ONT10:37 pmOntario

$883

JetBlue

Aug 13

ONT11:59 pmOntario

25h 31m

1 stop

LHR9:30 amLondon Heathrow

Aug 20

LHR11:55 amLondon Heathrow

18h 43m

1 stop

ONT10:38 pmOntario

$889

JetBlue

Sep 12

ONT10:39 pmOntario

14h 06m

1 stop

LHR8:45 pmLondon Heathrow

Oct 1

LHR11:55 amLondon Heathrow

17h 02m

1 stop

ONT8:57 pmOntario

$893

Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Alaska Airlines

Nov 25

ONT6:00 amOntario

22h 20m

1 stop

LHR12:20 pmLondon Heathrow

Dec 2

LHR2:45 pmLondon Heathrow

28h 24m

1 stop

ONT11:09 amOntario

$790

Alaska Airlines

Nov 1

ONT6:00 amOntario

22h 20m

1 stop

LHR12:20 pmLondon Heathrow

Nov 10

LHR2:45 pmLondon Heathrow

16h 09m

1 stop

ONT10:54 pmOntario

$799

Alaska Airlines

Nov 3

ONT6:00 amOntario

22h 20m

1 stop

LHR12:20 pmLondon Heathrow

Nov 8

LHR2:45 pmLondon Heathrow

16h 09m

1 stop

ONT10:54 pmOntario

$801

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 11/9

6:37 pm-7:25 am

1 stop28h 48m

London Heathrow

Thu 11/12

6:50 am-6:47 pm

2 stops19h 57m

$736

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 11/9

6:00 am-9:40 am

2 stops43h 40m

London Heathrow

Thu 11/12

6:50 am-6:47 pm

2 stops19h 57m

$746

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 11/25

6:00 am-12:20 pm

1 stop22h 20m

London Heathrow

Wed 12/2

2:45 pm-11:09 am

1 stop28h 24m

$790

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 11/1

6:00 am-12:20 pm

1 stop22h 20m

London Heathrow

Wed 11/11

2:45 pm-10:54 pm

1 stop16h 09m

$799

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/17

2:22 pm-12:00 pm

1 stop13h 38m

London Heathrow

Tue 11/24

2:45 pm-11:04 pm

1 stop16h 19m

$799

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/18

3:09 pm-12:00 pm

1 stop12h 51m

London Heathrow

Tue 3/16

2:45 pm-10:39 pm

1 stop14h 54m

$799

Quickest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 11/15

12:42 pm-10:00 am

1 stop13h 18m

London Heathrow

Mon 11/30

1:15 pm-7:05 pm

1 stop13h 50m

$824

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/10

12:42 pm-10:00 am

1 stop13h 18m

London Heathrow

Tue 11/24

1:15 pm-7:05 pm

1 stop13h 50m

$824

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 10/26

6:20 am-10:40 am

1 stop21h 20m

London Heathrow

Tue 11/3

6:30 am-5:12 pm

2 stops18h 42m

$865

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 10/26

1:24 pm-1:45 pm

2 stops17h 21m

London Heathrow

Tue 11/3

6:30 am-5:12 pm

2 stops18h 42m

$869

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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 $736.

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 $831. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $968. 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 54m
Direct flights	None

The fastest flight from Ontario to London takes 12h 54m

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 54m.
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 August 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 42% of all bookings. The subsequent popular airlines are British Airways at 23%, Virgin Atlantic at 23%, and Delta at 12%.

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 8,139 reviews	Search British Airways flights
Virgin Atlantic	PriceFrom $469	Free Cancellation	Rating 7.5 694 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $535	Free Cancellation	Rating 7.8 8,501 reviews	Search Delta flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,851 reviews	Search American Airlines flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 10,063 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $806	Free Cancellation	Rating 7.9 12,748 reviews	Search Alaska Airlines flights

Hounslow

Gatwick

Milton Keynes

Luton

Hayes

Wembley

Dover

Croydon

Stansted

Kingston upon Thames

Slough

Harrow

Watford

Cobham

Richmond

Uxbridge

Worthing

Romford

Ilford

Dunstable

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 $282

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 10/17. 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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JetBlue flights from Ontario to London

Our best JetBlue deals on Ontario to London flight tickets

Alaska Airlines flights from Ontario to London

Our best Alaska Airlines 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

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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.

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