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

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

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 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.

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 June 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.

$213 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 $1,545 to $1,304. The lowest price recently found on this route was $754.

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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.

7:00 am - 10:50 am

ONT

LHR

19h 50m

2 stops

9:30 am - 9:21 pm

LHR

ONT

19h 51m

2 stops

$754United Airlines

Tue, Nov 17 - Thu, Nov 19

7:00 am - 1:00 pm

ONT

LHR

22h 00m

2 stops

10:05 am - 5:47 pm

LHR

ONT

15h 42m

1 stop

$815SWISS

Tue, Nov 17 - Thu, Nov 19

12:35 pm - 2:25 pm

ONT

LHR

17h 50m

1 stop

11:30 am - 11:06 pm

LHR

ONT

19h 36m

2 stops

$825Iberia

Wed, Oct 7 - Tue, Oct 13

10:25 am - 2:25 pm

ONT

LHR

20h 00m

1 stop

10:50 am - 11:06 pm

LHR

ONT

20h 16m

2 stops

$827Multiple Airlines

Tue, Oct 6 - Thu, Oct 15

1:52 pm - 1:20 pm

ONT

LHR

15h 28m

2 stops

4:25 pm - 9:29 am

LHR

ONT

25h 04m

1 stop

$828Multiple Airlines

Wed, Oct 7 - Wed, Oct 14

2:59 pm - 12:15 pm

ONT

LHR

13h 16m

1 stop

3:00 pm - 10:19 pm

LHR

ONT

15h 19m

1 stop

$829British Airways

Tue, Dec 1 - Wed, Dec 16

6:00 am - 7:10 am

ONT

LHR

17h 10m

2 stops

9:55 am - 9:11 pm

LHR

ONT

19h 16m

1 stop

$831Multiple Airlines

Tue, Nov 17 - Thu, Nov 19

7:00 am - 9:25 am

ONT

LGW

18h 25m

2 stops

10:35 am - 10:43 pm

LGW

ONT

20h 08m

2 stops

$878Delta

Tue, Oct 6 - Tue, Oct 13

7:00 am - 7:15 am

ONT

LCY

16h 15m

2 stops

7:45 am - 6:18 pm

LCY

ONT

18h 33m

2 stops

$896Delta

Tue, Nov 17 - Thu, Nov 19

10:25 am - 1:20 pm

ONT

LCY

18h 55m

2 stops

9:35 am - 10:59 pm

LCY

ONT

21h 24m

2 stops

$1,122Iberia

Mon, Aug 3 - Wed, Aug 19

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Delta flights from Ontario to London

Our best Delta deals on Ontario to London flight tickets

Delta

Oct 5

ONT1:00 pmOntario

13h 00m

1 stop

LHR10:00 amLondon Heathrow

Oct 14

LHR6:30 amLondon Heathrow

17h 42m

2 stops

ONT4:12 pmOntario

$867

Delta

Sep 5

ONT5:05 pmOntario

19h 05m

2 stops

LHR8:10 pmLondon Heathrow

Sep 10

LHR8:40 amLondon Heathrow

22h 00m

2 stops

ONT10:40 pmOntario

$871

Delta

Oct 6

ONT7:00 amOntario

18h 25m

2 stops

LGW9:25 amLondon Gatwick

Oct 13

LGW10:35 amLondon Gatwick

20h 08m

2 stops

ONT10:43 pmOntario

$878

United Airlines flights from Ontario to London

Our best United Airlines deals on Ontario to London flight tickets

United Airlines

Nov 17

ONT7:00 amOntario

19h 50m

2 stops

LHR10:50 amLondon Heathrow

Nov 19

LHR9:30 amLondon Heathrow

19h 51m

2 stops

ONT9:21 pmOntario

$754

United Airlines

Oct 11

ONT5:00 amOntario

20h 40m

1 stop

LHR9:40 amLondon Heathrow

Oct 13

LHR7:30 amLondon Heathrow

21h 01m

2 stops

ONT8:31 pmOntario

$832

United Airlines

Oct 5

ONT1:24 pmOntario

15h 01m

1 stop

LHR12:25 pmLondon Heathrow

Oct 14

LHR7:30 amLondon Heathrow

21h 01m

2 stops

ONT8:31 pmOntario

$878

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/17

7:00 am-10:50 am

2 stops19h 50m

London Heathrow

Thu 11/19

9:30 am-9:21 pm

2 stops19h 51m

$754

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/17

7:00 am-1:00 pm

2 stops22h 00m

London Heathrow

Thu 11/19

10:05 am-5:47 pm

1 stop15h 42m

$815

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 10/7

12:35 pm-2:25 pm

1 stop17h 50m

London Heathrow

Tue 10/13

11:30 am-11:06 pm

2 stops19h 36m

$825

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/6

10:25 am-2:25 pm

1 stop20h 00m

London Heathrow

Thu 10/15

10:50 am-11:06 pm

2 stops20h 16m

$827

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 10/7

1:52 pm-1:20 pm

2 stops15h 28m

London Heathrow

Wed 10/14

4:25 pm-9:29 am

1 stop25h 04m

$828

Quickest round-trip

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/1

2:59 pm-12:15 pm

1 stop13h 16m

London Heathrow

Wed 12/16

3:00 pm-10:19 pm

1 stop15h 19m

$829

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 11/17

6:00 am-7:10 am

2 stops17h 10m

London Heathrow

Thu 11/19

9:55 am-9:11 pm

1 stop19h 16m

$831

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 10/6

7:00 am-9:25 am

2 stops18h 25m

London Gatwick

Tue 10/13

10:35 am-10:43 pm

2 stops20h 08m

$878

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Tue 11/17

7:00 am-7:15 am

2 stops16h 15m

London City

Thu 11/19

7:45 am-6:18 pm

2 stops18h 33m

$896

OntarioLondon

ONT - LCY

ONTLCY

Ontario

Mon 8/3

10:25 am-1:20 pm

2 stops18h 55m

London City

Wed 8/19

9:35 am-10:59 pm

2 stops21h 24m

$1,122

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 $772. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $909. 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 $688 when looking at flights departing at noon. Flights to London are more costly in the evening, with an average ticket price of $851. 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 45% 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 June 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 51% of all bookings. The subsequent popular airlines are British Airways at 31% 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 8,394 reviews	Search Delta flights
KLM	PriceFrom $580	Free Cancellation	Rating 7.8 1,527 reviews	Search KLM flights
American Airlines	PriceFrom $620	Free Cancellation	Rating 7.1 11,640 reviews	Search American Airlines flights
British Airways	PriceFrom $624	Free Cancellation	Rating 6.7 8,031 reviews	Search British Airways flights
United Airlines	PriceFrom $665	Free Cancellation	Rating 7.4 9,796 reviews	Search United Airlines flights

Hounslow

Gatwick

Milton Keynes

Luton

Dover

Hayes

Crawley

Croydon

Wembley

Stansted

Slough

Harrow

Brentwood

Watford

Cobham

Guildford

Folkestone

Uxbridge

Romford

Chelmsford

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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Cheap flights from Ontario to London from $213

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 8/22. 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 United Airlines 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.

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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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