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 44% of people opting to fly with this airline when traveling to London. Keep in mind that there are 22 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?

Denver (DEN) was the most common stop: 33% 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 31m.

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.

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

KLM, JetBlue, and Alaska Airlines 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.

$285 Cheap Flights from Ontario to London in 2026

Discover deals from 900+ travel sites with momondo.

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.

2:22 pm - 12:00 pmONT Ontario-LHR London Heathrow

13h 38m1 stop Dallas/Fort Worth

2:45 pm - 10:54 pmLHR London Heathrow-ONT Ontario

16h 09m1 stop Seattle/Tacoma Intl

$803Multiple Airlines

Tue, Nov 10 - Tue, Nov 17

12:00 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 20m1 stop Seattle/Tacoma Intl

2:45 pm - 10:39 pmLHR London Heathrow-ONT Ontario

15h 54m1 stop Seattle/Tacoma Intl

$804Alaska Airlines

Tue, Dec 1 - Tue, Dec 15

12:43 pm - 10:00 amONT Ontario-LHR London Heathrow

13h 17m1 stop Dallas/Fort Worth

2:45 pm - 10:39 pmLHR London Heathrow-ONT Ontario

15h 54m1 stop Seattle/Tacoma Intl

$804Multiple Airlines

Mon, Jan 18 - Sun, Jan 24

6:00 am - 12:20 pmONT Ontario-LHR London Heathrow

22h 20m1 stop Seattle/Tacoma Intl

2:45 pm - 11:06 pmLHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

$804Alaska Airlines

Sun, Nov 8 - Sun, Nov 15

12:46 pm - 10:00 amONT Ontario-LHR London Heathrow

13h 14m1 stop Dallas/Fort Worth

2:45 pm - 10:57 pmLHR London Heathrow-ONT Ontario

16h 12m1 stop Dallas/Fort Worth

$830British Airways

Tue, Dec 8 - Tue, Dec 15

3:09 pm - 12:15 pmONT Ontario-LHR London Heathrow

13h 06m1 stop Dallas/Fort Worth

2:45 pm - 10:49 pmLHR London Heathrow-ONT Ontario

16h 04m1 stop Dallas/Fort Worth

$841British Airways

Wed, Jan 6 - Thu, Jan 21

7:07 am - 7:45 amONT Ontario-LHR London Heathrow

16h 38m2 stops Atlanta Hartsfield-Jackson Detroit Metropolitan Wayne County

6:30 am - 5:13 pmLHR London Heathrow-ONT Ontario

18h 43m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$871Delta

Wed, Nov 4 - Wed, Nov 18

12:18 pm - 3:45 pmONT Ontario-LGW London Gatwick

19h 27m2 stops Atlanta Hartsfield-Jackson Paris Charles de Gaulle

10:00 am - 11:00 pmLGW London Gatwick-ONT Ontario

21h 00m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl

$878Delta

Wed, Nov 4 - Wed, Nov 18

12:18 pm - 1:15 pmONT Ontario-LHR London Heathrow

16h 57m1 stop Atlanta Hartsfield-Jackson

11:45 am - 10:43 pmLHR London Heathrow-ONT Ontario

18h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$906Virgin Atlantic

Wed, Oct 7 - Wed, Oct 14

7:00 am - 7:45 amONT Ontario-LHR London Heathrow

16h 45m2 stops Atlanta Hartsfield-Jackson Detroit Metropolitan Wayne County

12:40 pm - 11:48 pmLHR London Heathrow-ONT Ontario

19h 08m2 stops Atlanta Hartsfield-Jackson Salt Lake City

$909Virgin Atlantic

Sun, Jan 10 - Wed, Jan 13

Cheap last minute flights

Enter your travel dates to find the best prices.

1:06 pm - 10:00 amONT Ontario-LHR London Heathrow

12h 54m1 stop Salt Lake City

10:55 am - 4:24 pmLHR London Heathrow-ONT Ontario

13h 29m1 stop Salt Lake City

$1,046KLM

Wed, Aug 12 - Wed, Aug 19

1:06 pm - 10:00 amONT Ontario-LHR London Heathrow

12h 54m1 stop Salt Lake City

10:55 am - 4:24 pmLHR London Heathrow-ONT Ontario

13h 29m1 stop Salt Lake City

$1,069KLM

Wed, Aug 12 - Wed, Aug 19

6:01 pm - 3:35 pmONT Ontario-LHR London Heathrow

13h 34m1 stop Seattle/Tacoma Intl

10:55 am - 4:24 pmLHR London Heathrow-ONT Ontario

13h 29m1 stop Salt Lake City

$1,080Virgin Atlantic

Wed, Aug 12 - Wed, Aug 26

5:54 pm - 3:05 pmONT Ontario-LHR London Heathrow

13h 11m1 stop Seattle/Tacoma Intl

5:00 pm - 11:04 amLHR London Heathrow-ONT Ontario

26h 04m1 stop Seattle/Tacoma Intl

$1,082Alaska Airlines

Wed, Aug 12 - Wed, Aug 19

6:01 pm - 3:35 pmONT Ontario-LHR London Heathrow

13h 34m1 stop Seattle/Tacoma Intl

6:30 am - 11:34 pmLHR London Heathrow-ONT Ontario

25h 04m2 stops Amsterdam Schiphol Salt Lake City

$1,084Delta

Tue, Aug 11 - Tue, Aug 18

1:06 pm - 11:00 amONT Ontario-LHR London Heathrow

13h 54m1 stop Salt Lake City

10:55 am - 4:24 pmLHR London Heathrow-ONT Ontario

13h 29m1 stop Salt Lake City

$1,090Delta

Tue, Aug 11 - Wed, Aug 19

2:05 pm - 3:05 pmONT Ontario-LHR London Heathrow

17h 00m1 stop Seattle/Tacoma Intl

5:00 pm - 11:24 pmLHR London Heathrow-ONT Ontario

14h 24m1 stop Seattle/Tacoma Intl

$1,090Alaska Airlines

Wed, Aug 12 - Wed, Aug 19

1:06 pm - 10:00 amONT Ontario-LHR London Heathrow

12h 54m1 stop Salt Lake City

10:55 am - 4:24 pmLHR London Heathrow-ONT Ontario

13h 29m1 stop Salt Lake City

$1,090KLM

Wed, Aug 12 - Wed, Aug 19

7:05 am - 6:20 amONT Ontario-LHR London Heathrow

15h 15m1 stop Dallas/Fort Worth

2:45 pm - 10:59 pmLHR London Heathrow-ONT Ontario

16h 14m1 stop Dallas/Fort Worth

$1,130British Airways

Thu, Aug 13 - Thu, Aug 20

10:29 am - 9:00 amONT Ontario-LHR London Heathrow

14h 31m1 stop Dallas/Fort Worth

11:00 am - 6:15 pmLHR London Heathrow-ONT Ontario

15h 15m1 stop Phoenix Sky Harbor Intl

$1,130British Airways

Thu, Aug 13 - Thu, Aug 20

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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Alaska Airlines

Nov 8

ONT6:00 amOntario

22h 20m

1 stop

LHR12:20 pmLondon Heathrow

Nov 13

LHR2:45 pmLondon Heathrow

16h 09m

1 stop

ONT10:54 pmOntario

$806

Alaska Airlines

Nov 7

ONT4:09 pmOntario

36h 11m

1 stop

LHR12:20 pmLondon Heathrow

Nov 15

LHR2:45 pmLondon Heathrow

16h 09m

1 stop

ONT10:54 pmOntario

$815

Alaska Airlines

Nov 7

ONT4:09 pmOntario

36h 11m

1 stop

LHR12:20 pmLondon Heathrow

Nov 17

LHR2:45 pmLondon Heathrow

35h 32m

1 stop

ONT6:17 pmOntario

$821

Iberia flights from Ontario to London

Our best Iberia deals on Ontario to London flight tickets

Iberia

Nov 23

ONT6:00 amOntario

20h 00m

1 stop

LHR10:00 amLondon Heathrow

Dec 2

LHR7:40 pmLondon Heathrow

22h 14m

2 stops

ONT9:54 amOntario

$862

Iberia

Nov 23

ONT6:00 amOntario

20h 50m

2 stops

LGW10:50 amLondon Gatwick

Dec 2

LGW7:40 pmLondon Gatwick

22h 14m

2 stops

ONT9:54 amOntario

$869

Iberia

Oct 26

ONT7:00 amOntario

18h 15m

1 stop

LHR8:15 amLondon Heathrow

Nov 3

LHR6:05 amLondon Heathrow

24h 52m

2 stops

ONT10:57 pmOntario

$901

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 11/10

2:22 pm-12:00 pm

1 stop13h 38m

London Heathrow

Tue 11/17

2:45 pm-10:54 pm

1 stop16h 09m

$803

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 12/1

12:00 pm-12:20 pm

1 stop16h 20m

London Heathrow

Tue 12/15

2:45 pm-10:39 pm

1 stop15h 54m

$804

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 1/18

12:43 pm-10:00 am

1 stop13h 17m

London Heathrow

Sun 1/24

2:45 pm-10:39 pm

1 stop15h 54m

$804

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 11/8

6:00 am-12:20 pm

1 stop22h 20m

London Heathrow

Sun 11/15

2:45 pm-11:06 pm

1 stop16h 21m

$804

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 12/8

12:46 pm-10:00 am

1 stop13h 14m

London Heathrow

Tue 12/15

2:45 pm-10:57 pm

1 stop16h 12m

$830

Quickest round-trip

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 1/6

3:09 pm-12:15 pm

1 stop13h 06m

London Heathrow

Thu 1/21

2:45 pm-10:49 pm

1 stop16h 04m

$841

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 11/4

7:07 am-7:45 am

2 stops16h 38m

London Heathrow

Wed 11/18

6:30 am-5:13 pm

2 stops18h 43m

$871

OntarioLondon

ONT Ontario - LGW London Gatwick

ONTLGW

Ontario

Wed 11/4

12:18 pm-3:45 pm

2 stops19h 27m

London Gatwick

Wed 11/18

10:00 am-11:00 pm

2 stops21h 00m

$878

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 10/7

12:18 pm-1:15 pm

1 stop16h 57m

London Heathrow

Wed 10/14

11:45 am-10:43 pm

2 stops18h 58m

$906

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Sun 1/10

7:00 am-7:45 am

2 stops16h 45m

London Heathrow

Wed 1/13

12:40 pm-11:48 pm

2 stops19h 08m

$909

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?

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 $804.

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 $654.

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 $857. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $989. 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 $706 when looking at flights departing at noon. Flights to London are more costly in the afternoon, with an average ticket price of $949. 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 41% 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 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
Virgin Atlantic	PriceFrom $469	Free Cancellation	Rating 7.5 694 reviews	Search Virgin Atlantic flights
Delta	PriceFrom $535	Free Cancellation	Rating 7.8 8,505 reviews	Search Delta flights
British Airways	PriceFrom $615	Free Cancellation	Rating 6.7 8,154 reviews	Search British Airways flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,904 reviews	Search American Airlines flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 10,101 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $806	Free Cancellation	Rating 7.9 12,795 reviews	Search Alaska Airlines flights

Hounslow

Gatwick

Milton Keynes

Luton

Hayes

Wembley

Croydon

Dover

Stansted

Richmond

Kingston upon Thames

Harrow

Watford

Cobham

Slough

Uxbridge

Worthing

Romford

Ilford

Bedford

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

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Fly into one of these airports located in London

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London Gatwick Airport

London Heathrow Airport

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London Southend Airport

London Stansted Airport

Cheap flights from Ontario to London from $285

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 11/11. 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

Iberia flights from Ontario to London

Our best Iberia 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

Fly to other destinations from Ontario

According to popular flight searches on momondo this year

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