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?

Delta, JetBlue, and United Airlines 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 49% of people opting to fly with this airline when traveling to London. Keep in mind that there are 20 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 February 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.

$273 Cheap Flights from Ontario to London in 2026

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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.

7:30 am - 10:30 am

ONT

LHR

19h 00m

1 stop

6:30 am - 5:12 pm

LHR

ONT

17h 42m

2 stops

$625KLM

Thu, Mar 5 - Thu, Mar 12

7:30 am - 11:55 am

ONT

LHR

20h 25m

1 stop

6:30 am - 9:00 pm

LHR

ONT

21h 30m

2 stops

$634Delta

Thu, Mar 5 - Thu, Mar 12

6:00 am - 7:05 am

ONT

LHR

17h 05m

2 stops

6:30 am - 9:00 pm

LHR

ONT

21h 30m

2 stops

$639Delta

Thu, Mar 5 - Thu, Mar 12

10:25 pm - 6:25 am

ONT

LHR

24h 00m

1 stop

6:30 am - 10:37 pm

LHR

ONT

24h 07m

2 stops

$648Scandinavian Airlines

Sat, Apr 4 - Tue, Apr 21

6:15 am - 7:25 am

ONT

LHR

17h 10m

1 stop

10:05 am - 5:41 pm

LHR

ONT

14h 36m

1 stop

$652United Airlines

Thu, Mar 5 - Thu, Mar 12

7:30 am - 11:55 am

ONT

LHR

20h 25m

1 stop

3:05 pm - 10:33 pm

LHR

ONT

14h 28m

1 stop

$660Scandinavian Airlines

Sat, Mar 7 - Sat, Mar 14

1:50 pm - 9:40 am

ONT

LHR

12h 50m

1 stop

10:05 am - 5:41 pm

LHR

ONT

14h 36m

1 stop

$661United Airlines

Tue, Mar 10 - Sun, Mar 15

2:08 pm - 4:30 pm

ONT

LCY

18h 22m

2 stops

11:00 am - 11:46 pm

LCY

ONT

20h 46m

2 stops

$728Iberia

Wed, May 6 - Wed, May 13

7:00 am - 10:50 am

ONT

LGW

19h 50m

2 stops

7:40 pm - 1:49 pm

LGW

ONT

26h 09m

2 stops

$812Iberia

Thu, Feb 26 - Wed, Mar 4

6:00 am - 8:40 am

ONT

LGW

18h 40m

2 stops

10:45 am - 10:36 pm

LGW

ONT

19h 51m

2 stops

$935British Airways

Tue, May 5 - Tue, May 12

Air Canada flights from Ontario to London

Our best Air Canada deals on Ontario to London flight tickets

Air Canada

Mar 8

ONT6:15 amOntario

22h 35m

2 stops

LHR11:50 amLondon Heathrow

Mar 15

LHR6:00 pmLondon Heathrow

30h 41m

2 stops

ONT5:41 pmOntario

$710

Air Canada

Mar 29

ONT5:10 amOntario

41h 25m

2 stops

LHR6:35 amLondon Heathrow

Apr 5

LHR2:10 pmLondon Heathrow

38h 26m

2 stops

ONT8:36 pmOntario

$720

Air Canada

Feb 13

ONT5:00 amOntario

18h 10m

2 stops

LHR7:10 amLondon Heathrow

Feb 20

LHR1:25 pmLondon Heathrow

31h 18m

2 stops

ONT12:43 pmOntario

$991

Scandinavian Airlines flights from Ontario to London

Our best Scandinavian Airlines deals on Ontario to London flight tickets

Scandinavian Airlines

Apr 4

ONT10:25 pmOntario

24h 00m

1 stop

LHR6:25 amLondon Heathrow

Apr 21

LHR6:30 amLondon Heathrow

24h 07m

2 stops

ONT10:37 pmOntario

$648

Scandinavian Airlines

Mar 7

ONT7:30 amOntario

20h 25m

1 stop

LHR11:55 amLondon Heathrow

Mar 14

LHR3:05 pmLondon Heathrow

14h 28m

1 stop

ONT10:33 pmOntario

$660

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 3/5

7:30 am-10:30 am

1 stop19h 00m

London Heathrow

Thu 3/12

6:30 am-5:12 pm

2 stops17h 42m

$625

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 3/5

7:30 am-11:55 am

1 stop20h 25m

London Heathrow

Thu 3/12

6:30 am-9:00 pm

2 stops21h 30m

$634

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 3/5

6:00 am-7:05 am

2 stops17h 05m

London Heathrow

Thu 3/12

6:30 am-9:00 pm

2 stops21h 30m

$639

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 4/4

10:25 pm-6:25 am

1 stop24h 00m

London Heathrow

Tue 4/21

6:30 am-10:37 pm

2 stops24h 07m

$648

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 3/5

6:15 am-7:25 am

1 stop17h 10m

London Heathrow

Thu 3/12

10:05 am-5:41 pm

1 stop14h 36m

$652

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sat 3/7

7:30 am-11:55 am

1 stop20h 25m

London Heathrow

Sat 3/14

3:05 pm-10:33 pm

1 stop14h 28m

$660

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 3/10

1:50 pm-9:40 am

1 stop12h 50m

London Heathrow

Sun 3/15

10:05 am-5:41 pm

1 stop14h 36m

$661

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Wed 5/6

2:08 pm-4:30 pm

2 stops18h 22m

London City

Wed 5/13

11:00 am-11:46 pm

2 stops20h 46m

$728

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Thu 2/26

7:00 am-10:50 am

2 stops19h 50m

London Gatwick

Wed 3/4

7:40 pm-1:49 pm

2 stops26h 09m

$812

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 5/5

6:00 am-8:40 am

2 stops18h 40m

London Gatwick

Tue 5/12

10:45 am-10:36 pm

2 stops19h 51m

$935

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 cheapest month to fly to London?

The cheapest month to fly to London from Ontario is in February. Flight prices, which tend to average around $654, are often lower during this time because this is during the off-season. The month of March is another great option to travel to London, with average flight prices from Ontario averaging around $683.

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 $742. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $834. 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 $752 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $804. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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 40m
Direct flights	None

The fastest flight from Ontario to London takes 12h 40m

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

Search flight deals

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 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 February 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 British Airways, representing 30% of all bookings. The subsequent popular airlines are United Airlines at 25%, Delta at 18%, and Iberia at 14%.

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 8,174 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.7 1,450 reviews	Search KLM flights
British Airways	PriceFrom $624	Free Cancellation	Rating 6.7 7,723 reviews	Search British Airways flights
American Airlines	PriceFrom $624	Free Cancellation	Rating 7.2 11,258 reviews	Search American Airlines flights
United Airlines	PriceFrom $662	Free Cancellation	Rating 7.4 9,259 reviews	Search United Airlines flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Guildford

Crawley

Wembley

Dartford

Hayes

Croydon

Brentwood

Harrow

Watford

Cobham

Folkestone

Romford

Stansted

Richmond

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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Cheap flights from Ontario to London from $273

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 3/31. 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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Air Canada flights from Ontario to London

Our best Air Canada deals on Ontario to London flight tickets

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Our best Scandinavian Airlines deals on Ontario to London flight tickets

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See travel insights to London from

How to get the cheapest flight ticket from Ontario to 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?

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

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

What airlines fly to London?

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 travel time from Ontario to London?

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 12h 40m.

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.

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

How far is Ontario to London by plane?

When did momondo last update prices for flights from Ontario Airport to London?

How many operators does momondo search for flights from Ontario Airport to London?

How old do you have to be to fly from Ontario Airport to London?

What documentation or ID do you need to fly to London?

What is the most popular airline 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?

Why should I use momondo to find a flight deal from Ontario to London?

Can I find flights from Ontario to London with flexible booking policies on momondo?

How can momondo help me find flights 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?

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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