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 24 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?

Denver (DEN) has the shortest average layover time for this route: 1h 22m.

Which airport is the most popular layover for flights between Ontario and London?

Denver (DEN) was the most common stop: 40% 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 offers the lowest fares from Ontario to London?

Flights via San Francisco (SFO) offer the lowest average round-trip price of $725.

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

United Airlines and Delta 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 September 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.

$319 Cheap Flights from Ontario to London in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to London

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6:25 am - 7:30 pmONT Ontario-LHR London Heathrow

29h 05m2 stops Denver Intl Reykjavik Keflavik Intl

12:15 pm - 11:51 pmLHR London Heathrow-ONT Ontario

19h 36m2 stops Reykjavik Keflavik Intl Denver Intl

$653Multiple Airlines

Tue, Nov 10 - Tue, Nov 17

6:25 am - 7:30 pmONT Ontario-LHR London Heathrow

29h 05m2 stops Denver Intl Reykjavik Keflavik Intl

12:15 pm - 11:51 pmLHR London Heathrow-ONT Ontario

19h 36m2 stops Reykjavik Keflavik Intl Denver Intl

$654Multiple Airlines

Wed, Nov 4 - Tue, Nov 10

1:35 pm - 11:00 amONT Ontario-LHR London Heathrow

13h 25m1 stop Salt Lake City

12:20 pm - 10:43 pmLHR London Heathrow-ONT Ontario

17h 23m1 stop Seattle/Tacoma Intl

$725Virgin Atlantic

Tue, Oct 20 - Tue, Oct 27

6:00 pm - 3:35 pmONT Ontario-LHR London Heathrow

13h 35m1 stop Seattle/Tacoma Intl

12:20 pm - 10:43 pmLHR London Heathrow-ONT Ontario

17h 23m1 stop Seattle/Tacoma Intl

$734Virgin Atlantic

Mon, Oct 19 - Tue, Oct 27

7:07 am - 7:50 amONT Ontario-LHR London Heathrow

17h 43m1 stop Atlanta Hartsfield-Jackson

6:30 am - 10:43 pmLHR London Heathrow-ONT Ontario

24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$736Delta

Mon, Oct 26 - Tue, Nov 3

12:16 pm - 11:40 amONT Ontario-LHR London Heathrow

15h 24m1 stop Atlanta Hartsfield-Jackson

6:20 am - 4:24 pmLHR London Heathrow-ONT Ontario

18h 04m2 stops Paris Charles de Gaulle Salt Lake City

$737Delta

Wed, Nov 4 - Tue, Nov 10

2:13 pm - 12:20 pmONT Ontario-LHR London Heathrow

15h 07m1 stop Seattle/Tacoma Intl

2:45 pm - 11:31 pmLHR London Heathrow-ONT Ontario

16h 46m1 stop Seattle/Tacoma Intl

$743Alaska Airlines

Tue, Oct 27 - Tue, Nov 24

11:13 am - 12:20 pmONT Ontario-LHR London Heathrow

18h 07m1 stop Seattle/Tacoma Intl

2:45 pm - 11:31 pmLHR London Heathrow-ONT Ontario

16h 46m1 stop Seattle/Tacoma Intl

$743Alaska Airlines

Tue, Oct 27 - Wed, Nov 25

2:21 pm - 12:00 pmONT Ontario-LHR London Heathrow

13h 39m1 stop Dallas/Fort Worth

11:15 am - 6:51 pmLHR London Heathrow-ONT Ontario

15h 36m1 stop Dallas/Fort Worth

$846British Airways

Wed, Jan 13 - Sat, Jan 23

4:59 pm - 1:35 pmONT Ontario-LHR London Heathrow

12h 36m1 stop Phoenix Sky Harbor Intl

2:35 pm - 10:07 pmLHR London Heathrow-ONT Ontario

14h 32m1 stop Phoenix Sky Harbor Intl

$848British Airways

Mon, Mar 1 - Tue, Mar 16

Cheap last minute flights

Enter your travel dates to find the best prices.

3:14 pm - 3:05 pmONT Ontario-LHR London Heathrow

15h 51m1 stop Seattle/Tacoma Intl

5:00 pm - 6:00 pmLHR London Heathrow-ONT Ontario

33h 00m1 stop Seattle/Tacoma Intl

$729Alaska Airlines

Mon, Sep 28 - Tue, Oct 13

3:14 pm - 3:05 pmONT Ontario-LHR London Heathrow

15h 51m1 stop Seattle/Tacoma Intl

5:00 pm - 11:42 pmLHR London Heathrow-ONT Ontario

14h 42m1 stop Seattle/Tacoma Intl

$744Alaska Airlines

Tue, Sep 29 - Thu, Oct 15

1:04 pm - 10:00 amONT Ontario-LHR London Heathrow

12h 56m1 stop Salt Lake City

10:55 am - 4:35 pmLHR London Heathrow-ONT Ontario

13h 40m1 stop Salt Lake City

$794Multiple Airlines

Wed, Sep 30 - Sun, Oct 4

6:00 pm - 3:35 pmONT Ontario-LHR London Heathrow

13h 35m1 stop Seattle/Tacoma Intl

11:40 am - 10:43 pmLHR London Heathrow-ONT Ontario

19h 03m1 stop Seattle/Tacoma Intl

$844Delta

Fri, Oct 2 - Sun, Oct 18

6:00 pm - 3:35 pmONT Ontario-LHR London Heathrow

13h 35m1 stop Seattle/Tacoma Intl

11:40 am - 10:43 pmLHR London Heathrow-ONT Ontario

19h 03m1 stop Seattle/Tacoma Intl

$844Delta

Fri, Oct 2 - Mon, Oct 19

10:39 pm - 8:45 pmONT Ontario-LHR London Heathrow

14h 06m1 stop New York John F Kennedy Intl

11:55 am - 10:12 pmLHR London Heathrow-ONT Ontario

18h 17m1 stop New York John F Kennedy Intl

$889JetBlue

Sun, Sep 27 - Tue, Oct 13

1:52 pm - 11:10 amONT Ontario-LHR London Heathrow

13h 18m1 stop San Francisco

1:40 pm - 9:59 pmLHR London Heathrow-ONT Ontario

16h 19m1 stop Houston George Bush Intcntl

$894United Airlines

Fri, Oct 2 - Sun, Oct 11

1:52 pm - 11:10 amONT Ontario-LHR London Heathrow

13h 18m1 stop San Francisco

1:40 pm - 9:59 pmLHR London Heathrow-ONT Ontario

16h 19m1 stop Houston George Bush Intcntl

$894United Airlines

Fri, Oct 2 - Sat, Oct 10

2:22 pm - 12:50 pmONT Ontario-LHR London Heathrow

14h 28m1 stop Dallas/Fort Worth

1:50 pm - 10:59 pmLHR London Heathrow-ONT Ontario

16h 09m1 stop Charlotte Douglas

$1,092British Airways

Sun, Sep 27 - Wed, Oct 28

2:22 pm - 12:50 pmONT Ontario-LHR London Heathrow

14h 28m1 stop Dallas/Fort Worth

4:25 pm - 11:52 pmLHR London Heathrow-ONT Ontario

15h 27m1 stop Dallas/Fort Worth

$1,153British Airways

Mon, Sep 28 - Mon, Oct 5

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Alaska Airlines flights from Ontario to London

Our best Alaska Airlines deals on Ontario to London flight tickets

Alaska Airlines

Sep 28

ONT3:14 pmOntario

15h 51m

1 stop

LHR3:05 pmLondon Heathrow

Oct 13

LHR5:00 pmLondon Heathrow

33h 00m

1 stop

ONT6:00 pmOntario

$729

Alaska Airlines

Oct 4

ONT6:02 amOntario

25h 03m

1 stop

LHR3:05 pmLondon Heathrow

Oct 20

LHR5:00 pmLondon Heathrow

33h 00m

1 stop

ONT6:00 pmOntario

$730

Alaska Airlines

Oct 4

ONT6:02 amOntario

25h 03m

1 stop

LHR3:05 pmLondon Heathrow

Oct 20

LHR5:00 pmLondon Heathrow

33h 00m

1 stop

ONT6:00 pmOntario

$735

Virgin Atlantic flights from Ontario to London

Our best Virgin Atlantic deals on Ontario to London flight tickets

Virgin Atlantic

Oct 20

ONT1:35 pmOntario

13h 25m

1 stop

LHR11:00 amLondon Heathrow

Oct 27

LHR12:20 pmLondon Heathrow

17h 23m

1 stop

ONT10:43 pmOntario

$725

Virgin Atlantic

Oct 19

ONT6:00 pmOntario

13h 35m

1 stop

LHR3:35 pmLondon Heathrow

Oct 27

LHR12:20 pmLondon Heathrow

17h 23m

1 stop

ONT10:43 pmOntario

$734

Virgin Atlantic

Nov 24

ONT7:05 amOntario

15h 20m

1 stop

LHR6:25 amLondon Heathrow

Jan 13

LHR10:45 amLondon Heathrow

13h 27m

1 stop

ONT4:12 pmOntario

$761

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 11/10

6:25 am-7:30 pm

2 stops29h 05m

London Heathrow

Tue 11/17

12:15 pm-11:51 pm

2 stops19h 36m

$653

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 11/4

6:25 am-7:30 pm

2 stops29h 05m

London Heathrow

Tue 11/10

12:15 pm-11:51 pm

2 stops19h 36m

$654

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 10/20

1:35 pm-11:00 am

1 stop13h 25m

London Heathrow

Tue 10/27

12:20 pm-10:43 pm

1 stop17h 23m

$725

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 10/19

6:00 pm-3:35 pm

1 stop13h 35m

London Heathrow

Tue 10/27

12:20 pm-10:43 pm

1 stop17h 23m

$734

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 10/26

7:07 am-7:50 am

1 stop17h 43m

London Heathrow

Tue 11/3

6:30 am-10:43 pm

2 stops24h 13m

$736

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 11/4

12:16 pm-11:40 am

1 stop15h 24m

London Heathrow

Tue 11/10

6:20 am-4:24 pm

2 stops18h 04m

$737

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 10/27

2:13 pm-12:20 pm

1 stop15h 07m

London Heathrow

Tue 11/24

2:45 pm-11:31 pm

1 stop16h 46m

$743

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Tue 10/27

11:13 am-12:20 pm

1 stop18h 07m

London Heathrow

Wed 11/25

2:45 pm-11:31 pm

1 stop16h 46m

$743

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Wed 1/13

2:21 pm-12:00 pm

1 stop13h 39m

London Heathrow

Sat 1/23

11:15 am-6:51 pm

1 stop15h 36m

$846

Quickest round-trip

OntarioLondon

ONT Ontario - LHR London Heathrow

ONTLHR

Ontario

Mon 3/1

4:59 pm-1:35 pm

1 stop12h 36m

London Heathrow

Tue 3/16

2:35 pm-10:07 pm

1 stop14h 32m

$848

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 January. Flight prices, which tend to average around $688, 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 $743.

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 $923. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,034. 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 $810 when looking at flights departing at noon. Flights to London are more costly in the afternoon, with an average ticket price of $993. 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 56% 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

Best Price Found	$319
Fastest flight time	12h 36m
Direct flights	None

The best one-way flight to London from Ontario in the past 72 hours is $319. The best round-trip flight deal from Ontario to London found on momondo in the last 72 hours is $653.

The fastest flight from Ontario to London takes 12h 36m

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 36m.
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 September 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 28% and Virgin Atlantic at 25%.

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 $488	Free Cancellation	Rating 7.4 694 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom $615	Free Cancellation	Rating 6.7 8,233 reviews	Search British Airways flights
Delta	PriceFrom $671	Free Cancellation	Rating 7.8 8,608 reviews	Search Delta flights
United Airlines	PriceFrom $703	Free Cancellation	Rating 7.4 10,248 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $806	Free Cancellation	Rating 7.9 12,976 reviews	Search Alaska Airlines flights

Hounslow

Gatwick

Milton Keynes

Croydon

Luton

Hayes

Dover

Wembley

Kingston upon Thames

Richmond

Stansted

Watford

Harrow

Cobham

Worthing

Eastbourne

Slough

Hook

Uxbridge

Ilford

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 Southend Airport

London Stansted Airport

Cheap flights from Ontario to London from $319

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 1/12. 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

Virgin Atlantic flights from Ontario to London

Our best Virgin Atlantic 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?

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

Best Price Found

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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