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

British Airways, United Airlines, and American Airlines are the most popular carriers operating from London to Ontario

What airlines fly to Ontario?

British Airways, Virgin Atlantic and American Airlines are the top three most popular airlines that fly to Ontario from London according to our data. British Airways is the first choice among our users, with 54% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 12 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

Prices for flights from London to Ontario Airport are updated daily.

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

As of December 2025, there is 1 operator available to choose from for flights from London to Ontario Airport.

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

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$397 Cheap Flights from London to Ontario in 2025/26

Q: What is the typical price of a round-trip flight between London and Ontario?

Prices are currently low for flights on this route. Typical prices usually range from $700 to $837. The lowest price recently found on this route was $611.

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Find the cheapest flights from London to Los Angeles

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:35 am - 5:43 pm

LHR

ONT

19h 08m2 stops

5:05 am - 7:10 am

ONT

LHR

18h 05m2 stops

$611Multiple Airlines

Tue, Jan 27 - Tue, Feb 3

7:35 am - 10:48 pm

LHR

ONT

23h 13m2 stops

3:09 pm - 12:15 pm

ONT

LHR

13h 06m1 stop

$615British Airways

Wed, Jan 28 - Wed, Feb 4

6:05 am - 10:48 pm

LHR

ONT

24h 43m2 stops

7:16 am - 12:15 pm

ONT

LHR

20h 59m1 stop

$620British Airways

Tue, Jan 27 - Tue, Feb 3

10:45 am - 9:48 pm

LHR

ONT

18h 03m1 stop

12:45 pm - 6:45 am

ONT

LHR

34h 00m1 stop

$626Virgin Atlantic

Sat, Mar 28 - Sat, Apr 11

7:30 am - 8:58 pm

LHR

ONT

21h 28m2 stops

5:05 am - 5:55 am

ONT

LHR

16h 50m2 stops

$636United Airlines

Tue, Jan 13 - Tue, Jan 20

7:40 pm - 4:24 pm

LGW

ONT

28h 44m2 stops

10:56 am - 7:00 pm

ONT

LGW

25h 04m2 stops

$637British Airways

Mon, Mar 2 - Mon, Mar 16

12:30 pm - 2:18 pm

LGW

ONT

33h 48m2 stops

6:00 am - 7:30 am

ONT

LGW

17h 30m2 stops

$651American Airlines

Mon, Jan 26 - Tue, Feb 10

10:45 am - 10:38 pm

LHR

ONT

19h 53m1 stop

12:41 pm - 7:50 am

ONT

LHR

35h 09m1 stop

$662Virgin Atlantic

Sun, Jan 11 - Sun, Jan 18

11:20 am - 10:34 pm

LHR

ONT

19h 14m1 stop

1:20 pm - 9:50 am

ONT

LHR

12h 30m1 stop

$664Delta

Sun, Mar 29 - Fri, Apr 10

10:00 am - 10:28 pm

LCY

ONT

44h 28m2 stops

7:05 am - 7:15 am

ONT

LCY

16h 10m2 stops

$1,047Delta

Fri, Dec 26 - Tue, Dec 30

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

Mar 31

LHR11:20 amLondon Heathrow

13h 53m

1 stop

ONT5:13 pmOntario

Apr 9

ONT10:30 pmOntario

24h 15m

1 stop

LHR6:45 amLondon Heathrow

$697

Find similar

KLM

Jan 11

LHR10:45 amLondon Heathrow

13h 27m

1 stop

ONT4:12 pmOntario

Oct 19

ONT1:00 pmOntario

12h 50m

1 stop

LHR9:50 amLondon Heathrow

$701

Find similar

KLM

Jan 13

LCY8:05 pmLondon City

33h 00m

2 stops

ONT9:05 pmOntario

Jan 20

ONT12:41 pmOntario

19h 54m

2 stops

LCY4:35 pmLondon City

$719

Find similar

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

Jan 13

LHR7:30 amLondon Heathrow

21h 28m

2 stops

ONT8:58 pmOntario

Jan 20

ONT5:05 amOntario

16h 50m

2 stops

LHR5:55 amLondon Heathrow

$636

Find similar

United Airlines

Jan 12

LHR10:05 amLondon Heathrow

15h 38m

1 stop

ONT5:43 pmOntario

Feb 2

ONT1:53 pmOntario

14h 07m

1 stop

LHR12:00 pmLondon Heathrow

$667

Find similar

United Airlines

Jan 21

LHR10:05 amLondon Heathrow

15h 38m

1 stop

ONT5:43 pmOntario

Feb 2

ONT1:53 pmOntario

14h 07m

1 stop

LHR12:00 pmLondon Heathrow

$668

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 1/27

6:35 am-5:43 pm

2 stops19h 08m

Ontario

Tue 2/3

5:05 am-7:10 am

2 stops18h 05m

$611

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/28

7:35 am-10:48 pm

2 stops23h 13m

Ontario

Wed 2/4

3:09 pm-12:15 pm

1 stop13h 06m

$615

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 1/27

6:05 am-10:48 pm

2 stops24h 43m

Ontario

Tue 2/3

7:16 am-12:15 pm

1 stop20h 59m

$620

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 3/28

10:45 am-9:48 pm

1 stop18h 03m

Ontario

Sat 4/11

12:45 pm-6:45 am

1 stop34h 00m

$626

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 1/13

7:30 am-8:58 pm

2 stops21h 28m

Ontario

Tue 1/20

5:05 am-5:55 am

2 stops16h 50m

$636

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Mon 3/2

7:40 pm-4:24 pm

2 stops28h 44m

Ontario

Mon 3/16

10:56 am-7:00 pm

2 stops25h 04m

$637

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Mon 1/26

12:30 pm-2:18 pm

2 stops33h 48m

Ontario

Tue 2/10

6:00 am-7:30 am

2 stops17h 30m

$651

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 1/11

10:45 am-10:38 pm

1 stop19h 53m

Ontario

Sun 1/18

12:41 pm-7:50 am

1 stop35h 09m

$662

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sun 3/29

11:20 am-10:34 pm

1 stop19h 14m

Ontario

Fri 4/10

1:20 pm-9:50 am

1 stop12h 30m

$664

LondonOntario

LCY - ONT

LCYONT

London City

Fri 12/26

10:00 am-10:28 pm

2 stops44h 28m

Ontario

Tue 12/30

7:05 am-7:15 am

2 stops16h 10m

$1,047

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 London to Ontario

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

What is the typical price of a round-trip flight between London and Ontario?

What is the cheapest month to fly to Ontario?

In general, January is the cheapest month to fly from London to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $546. If you aren’t able to travel during the month of January, then book flights to Ontario from London during September instead. Flights to Ontario in September, while not as cheap as those in January, still average around $551.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $602. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from London to Ontario for around $991.

What is the cheapest time of day to depart on your flight to Ontario?

In the afternoon is the cheapest time of day to fly from London to Ontario when you can find flight prices for as low as $602. Flying to Ontario in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $814 on average. Flights to Ontario from London at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Ontario?

You are more likely to see cheaper flights to Ontario from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $716 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from London for as low as $527 on momondo.

Can stopping save me money on London to Ontario flights?

You could potentially save up to 14% on your flight if you consider stops on a London to Ontario flight.

When to book flights from London to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from London to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap London to Ontario (LON to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Ontario

Fastest flight time	13h 27m
Direct flights	None

The fastest flight from London to Ontario takes 13h 27m

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

Search flight deals

How far is London to Ontario by plane?
The distance between London and Ontario is about 5417.5 mi. Typically, this will take 13h 27m by plane in normal conditions.
When did momondo last update prices for flights from London to Ontario Airport?
Prices for flights from London to Ontario Airport are updated daily.
How many operators does momondo search for flights from London to Ontario Airport?
As of December 2025, there is 1 operator available to choose from for flights from London to Ontario Airport.
How old do you have to be to fly from London to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from London to Ontario

Compare and see reviews for airlines that fly from London to Ontario with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $560	Free Cancellation	Rating 7.4 9,092 reviews		Search United Airlines flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from London.

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

Yes. momondo allows you to filter the results for London to Ontario flights to just show those with flexible booking policies.

How can momondo help me find flights from London to Ontario?

momondo provides multiple filters to help you find the best flight to Ontario from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from London to Ontario right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.