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.

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

JetBlue, Delta, and United Airlines 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.

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.

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 connection time from Ontario to London?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 13m.

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.

$289 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 $954 to $1,290. The lowest price recently found on this route was $798.

Discover deals from 900+ travel sites with momondo.

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.

6:07 am - 10:00 am

ONT

LHR

19h 53m

2 stops

2:45 pm - 1:16 pm

LHR

ONT

29h 31m

1 stop

$798Multiple Airlines

Mon, Oct 19 - Thu, Oct 29

5:00 am - 11:50 am

ONT

LHR

23h 50m

2 stops

2:45 pm - 11:18 am

LHR

ONT

28h 33m

1 stop

$801Multiple Airlines

Wed, Oct 28 - Tue, Nov 10

2:13 pm - 3:05 pm

ONT

LHR

16h 52m

1 stop

2:45 pm - 6:00 pm

LHR

ONT

34h 15m

1 stop

$810Alaska Airlines

Tue, Oct 20 - Tue, Oct 27

7:10 pm - 12:20 pm

ONT

LHR

33h 10m

1 stop

2:45 pm - 10:54 pm

LHR

ONT

16h 09m

1 stop

$815Alaska Airlines

Sun, Nov 1 - Wed, Nov 11

1:05 pm - 10:30 am

ONT

LHR

13h 25m

1 stop

1:15 pm - 9:54 pm

LHR

ONT

15h 39m

1 stop

$819British Airways

Sun, Oct 18 - Sun, Oct 25

1:17 pm - 3:45 pm

ONT

LGW

19h 28m

2 stops

10:00 am - 10:43 pm

LGW

ONT

20h 43m

2 stops

$877Delta

Tue, Oct 27 - Wed, Nov 4

7:05 am - 9:40 am

ONT

LGW

18h 35m

2 stops

10:35 am - 10:43 pm

LGW

ONT

20h 08m

2 stops

$917Delta

Mon, Oct 12 - Tue, Oct 20

6:00 am - 8:40 am

ONT

LGW

18h 40m

2 stops

2:30 pm - 11:43 am

LGW

ONT

29h 13m

2 stops

$936American Airlines

Mon, Aug 17 - Wed, Sep 2

7:05 am - 8:40 am

ONT

LGW

17h 35m

2 stops

10:30 am - 10:59 pm

LGW

ONT

20h 29m

2 stops

$937American Airlines

Tue, Sep 1 - Tue, Sep 8

10:50 am - 2:05 pm

ONT

LCY

19h 15m

2 stops

7:15 pm - 9:55 am

LCY

ONT

22h 40m

2 stops

$1,605British Airways

Wed, Dec 23 - Mon, Dec 28

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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Alaska Airlines

Oct 20

ONT2:13 pmOntario

16h 52m

1 stop

LHR3:05 pmLondon Heathrow

Oct 27

LHR2:45 pmLondon Heathrow

34h 15m

1 stop

ONT6:00 pmOntario

$810

Alaska Airlines

Nov 1

ONT7:10 pmOntario

33h 10m

1 stop

LHR12:20 pmLondon Heathrow

Nov 11

LHR2:45 pmLondon Heathrow

16h 09m

1 stop

ONT10:54 pmOntario

$815

Alaska Airlines

Nov 1

ONT7:10 pmOntario

33h 10m

1 stop

LHR12:20 pmLondon Heathrow

Nov 8

LHR2:45 pmLondon Heathrow

16h 09m

1 stop

ONT10:54 pmOntario

$818

British Airways flights from Ontario to London

Our best British Airways deals on Ontario to London flight tickets

British Airways

Oct 18

ONT1:05 pmOntario

13h 25m

1 stop

LHR10:30 amLondon Heathrow

Oct 25

LHR1:15 pmLondon Heathrow

15h 39m

1 stop

ONT9:54 pmOntario

$819

British Airways

Oct 21

ONT1:05 pmOntario

13h 25m

1 stop

LHR10:30 amLondon Heathrow

Oct 23

LHR4:10 pmLondon Heathrow

13h 44m

1 stop

ONT9:54 pmOntario

$829

British Airways

Nov 18

ONT12:42 pmOntario

13h 18m

1 stop

LHR10:00 amLondon Heathrow

Nov 23

LHR1:50 pmLondon Heathrow

15h 49m

1 stop

ONT9:39 pmOntario

$830

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 10/19

6:07 am-10:00 am

2 stops19h 53m

London Heathrow

Thu 10/29

2:45 pm-1:16 pm

1 stop29h 31m

$798

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 10/28

5:00 am-11:50 am

2 stops23h 50m

London Heathrow

Tue 11/10

2:45 pm-11:18 am

1 stop28h 33m

$801

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/20

2:13 pm-3:05 pm

1 stop16h 52m

London Heathrow

Tue 10/27

2:45 pm-6:00 pm

1 stop34h 15m

$810

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 11/1

7:10 pm-12:20 pm

1 stop33h 10m

London Heathrow

Wed 11/11

2:45 pm-10:54 pm

1 stop16h 09m

$815

Quickest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 10/18

1:05 pm-10:30 am

1 stop13h 25m

London Heathrow

Sun 10/25

1:15 pm-9:54 pm

1 stop15h 39m

$819

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 10/27

1:17 pm-3:45 pm

2 stops19h 28m

London Gatwick

Wed 11/4

10:00 am-10:43 pm

2 stops20h 43m

$877

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 10/12

7:05 am-9:40 am

2 stops18h 35m

London Gatwick

Tue 10/20

10:35 am-10:43 pm

2 stops20h 08m

$917

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Mon 8/17

6:00 am-8:40 am

2 stops18h 40m

London Gatwick

Wed 9/2

2:30 pm-11:43 am

2 stops29h 13m

$936

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 9/1

7:05 am-8:40 am

2 stops17h 35m

London Gatwick

Tue 9/8

10:30 am-10:59 pm

2 stops20h 29m

$937

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Wed 12/23

10:50 am-2:05 pm

2 stops19h 15m

London City

Mon 12/28

7:15 pm-9:55 am

2 stops22h 40m

$1,605

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 March. Flight prices, which tend to average around $663, 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 $686 when looking at flights departing at noon. Flights to London are more costly in the afternoon, with an average ticket price of $920. 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 18m
Direct flights	None

The fastest flight from Ontario to London takes 12h 18m

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 18m.
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 22%, 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
Virgin Atlantic	PriceFrom $469	Free Cancellation	Rating 7.5 693 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $535	Free Cancellation	Rating 7.8 8,476 reviews	Search Delta flights
British Airways	PriceFrom $615	Free Cancellation	Rating 6.7 8,124 reviews	Search British Airways flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,834 reviews	Search American Airlines flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 10,020 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $931	Free Cancellation	Rating 7.9 12,688 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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Fly into one of these airports located in London

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London Stansted Airport

Cheap flights from Ontario to London from $289

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 10/3. 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

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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

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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