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 American 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 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?

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

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.

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.

$448 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 $1,054 to $756. The lowest price recently found on this route was $891.

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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.

10:25 am - 12:50 pm

ONT

LHR

18h 25m

1 stop

6:15 am - 9:08 pm

LHR

ONT

22h 53m

2 stops

$891Iberia

Tue, Oct 6 - Wed, Oct 14

2:22 pm - 2:25 pm

ONT

LHR

16h 03m

1 stop

7:50 am - 9:08 pm

LHR

ONT

21h 18m

2 stops

$895Iberia

Tue, Oct 6 - Thu, Oct 15

10:00 pm - 6:25 am

ONT

LHR

24h 25m

1 stop

6:30 am - 6:01 pm

LHR

ONT

19h 31m

2 stops

$896Delta

Mon, Aug 3 - Thu, Aug 20

11:48 am - 1:05 pm

ONT

LHR

17h 17m

2 stops

6:30 am - 6:01 pm

LHR

ONT

19h 31m

2 stops

$900Delta

Mon, Aug 3 - Thu, Aug 20

1:00 pm - 9:20 am

ONT

LHR

37h 20m

2 stops

2:30 pm - 5:47 pm

LHR

ONT

35h 17m

2 stops

$902Air Canada

Sat, Oct 31 - Fri, Nov 13

1:18 pm - 12:25 pm

ONT

LHR

15h 07m

1 stop

7:30 am - 9:59 pm

LHR

ONT

22h 29m

2 stops

$907United Airlines

Mon, Aug 3 - Thu, Aug 20

5:00 am - 9:20 am

ONT

LHR

45h 20m

2 stops

11:10 am - 8:20 pm

LHR

ONT

41h 10m

2 stops

$910Air Canada

Sat, Oct 31 - Thu, Nov 12

5:45 am - 8:40 pm

ONT

LHR

30h 55m

2 stops

7:30 am - 9:59 pm

LHR

ONT

22h 29m

2 stops

$911United Airlines

Sat, Aug 22 - Tue, Sep 8

9:15 am - 2:40 pm

ONT

LGW

21h 25m

2 stops

3:40 pm - 10:35 pm

LGW

ONT

38h 55m

2 stops

$1,091Multiple Airlines

Tue, Oct 6 - Wed, Oct 14

9:15 am - 2:40 pm

ONT

LGW

21h 25m

2 stops

3:40 pm - 11:53 pm

LGW

ONT

40h 13m

2 stops

$1,098Multiple Airlines

Tue, Oct 6 - Tue, Oct 13

Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets

Delta

Aug 3

ONT10:00 pmOntario

24h 25m

1 stop

LHR6:25 amLondon Heathrow

Aug 20

LHR6:30 amLondon Heathrow

19h 31m

2 stops

ONT6:01 pmOntario

$896

Delta

Aug 3

ONT11:48 amOntario

17h 17m

2 stops

LHR1:05 pmLondon Heathrow

Aug 20

LHR6:30 amLondon Heathrow

19h 31m

2 stops

ONT6:01 pmOntario

$900

Delta

Aug 3

ONT12:55 pmOntario

16h 10m

2 stops

LHR1:05 pmLondon Heathrow

Aug 20

LHR6:30 amLondon Heathrow

23h 22m

2 stops

ONT9:52 pmOntario

$901

British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets

British Airways

Aug 5

ONT2:27 pmOntario

13h 43m

1 stop

LHR12:10 pmLondon Heathrow

Aug 19

LHR2:25 pmLondon Heathrow

16h 33m

1 stop

ONT10:58 pmOntario

$939

British Airways

Aug 22

ONT11:59 pmOntario

22h 21m

1 stop

LHR6:20 amLondon Heathrow

Sep 8

LHR10:05 amLondon Heathrow

19h 07m

1 stop

ONT9:12 pmOntario

$940

British Airways

Oct 22

ONT1:31 pmOntario

12h 59m

1 stop

LHR10:30 amLondon Heathrow

Oct 30

LHR2:25 pmLondon Heathrow

14h 10m

1 stop

ONT9:35 pmOntario

$960

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/6

10:25 am-12:50 pm

1 stop18h 25m

London Heathrow

Wed 10/14

6:15 am-9:08 pm

2 stops22h 53m

$891

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/6

2:22 pm-2:25 pm

1 stop16h 03m

London Heathrow

Thu 10/15

7:50 am-9:08 pm

2 stops21h 18m

$895

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 8/3

10:00 pm-6:25 am

1 stop24h 25m

London Heathrow

Thu 8/20

6:30 am-6:01 pm

2 stops19h 31m

$896

Quickest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 8/3

11:48 am-1:05 pm

2 stops17h 17m

London Heathrow

Thu 8/20

6:30 am-6:01 pm

2 stops19h 31m

$900

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 10/31

1:00 pm-9:20 am

2 stops37h 20m

London Heathrow

Fri 11/13

2:30 pm-5:47 pm

2 stops35h 17m

$902

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 8/3

1:18 pm-12:25 pm

1 stop15h 07m

London Heathrow

Thu 8/20

7:30 am-9:59 pm

2 stops22h 29m

$907

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 10/31

5:00 am-9:20 am

2 stops45h 20m

London Heathrow

Thu 11/12

11:10 am-8:20 pm

2 stops41h 10m

$910

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 8/22

5:45 am-8:40 pm

2 stops30h 55m

London Heathrow

Tue 9/8

7:30 am-9:59 pm

2 stops22h 29m

$911

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 10/6

9:15 am-2:40 pm

2 stops21h 25m

London Gatwick

Wed 10/14

3:40 pm-10:35 pm

2 stops38h 55m

$1,091

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 10/6

9:15 am-2:40 pm

2 stops21h 25m

London Gatwick

Tue 10/13

3:40 pm-11:53 pm

2 stops40h 13m

$1,098

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 $744. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $863. 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 $728 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $815. 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 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.

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 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 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 47% of all bookings. The subsequent popular airlines are British Airways at 35% and Delta at 18%.

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 7.9 8,459 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.8 1,511 reviews	Search KLM flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,668 reviews	Search American Airlines flights
British Airways	PriceFrom $624	Free Cancellation	Rating 6.7 7,945 reviews	Search British Airways flights
United Airlines	PriceFrom $662	Free Cancellation	Rating 7.4 9,683 reviews	Search United Airlines flights

Hounslow

Gatwick

Milton Keynes

Dover

Luton

Hayes

Crawley

Slough

Wembley

Stansted

Watford

Croydon

Uxbridge

Brentwood

Dartford

Cobham

Folkestone

Romford

Harrow

Guildford

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

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.

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Fly into one of these airports located in London

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London Heathrow Airport

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London Southend Airport

London Stansted Airport

Cheap flights from Ontario to London from $448

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 10/4. 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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Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets

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Our best British Airways 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

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

Fly to other destinations from Ontario

According to popular flight searches on momondo this year

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