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

British Airways, Virgin Atlantic, and United 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 53% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 13 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 October 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.

$343 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 $587 to $803. The lowest price recently found on this route was $561.

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6:30 am - 10:38 pmLHR-ONT

24h 08m2 stops

6:45 am - 12:50 pmONT-LHR

22h 05m1 stop

$561Virgin Atlantic

Find Deal

Thu, Feb 26 - Mon, Mar 2

6:30 am - 9:14 pmLHR-ONT

22h 44m2 stops

5:05 pm - 10:00 amONT-LHR

32h 55m1 stop

$571Delta

Find Deal

Thu, Feb 26 - Mon, Mar 2

10:55 am - 4:19 pmLHR-ONT

13h 24m1 stop

1:00 pm - 9:50 amONT-LHR

12h 50m1 stop

$578KLM

Find Deal

Tue, Mar 31 - Tue, Apr 7

2:45 pm - 10:38 pmLHR-ONT

14h 53m1 stop

1:00 pm - 9:50 amONT-LHR

12h 50m1 stop

$597KLM

Find Deal

Mon, Mar 16 - Tue, Mar 31

12:30 pm - 1:57 pmLGW-ONT

33h 27m2 stops

4:59 pm - 7:30 amONT-LGW

30h 31m2 stops

$616American Airlines

Find Deal

Thu, Feb 26 - Mon, Mar 2

3:05 pm - 10:38 pmLHR-ONT

14h 33m1 stop

1:00 pm - 9:00 amONT-LHR

13h 00m1 stop

$640Multiple Airlines

Find Deal

Sat, Mar 21 - Wed, Mar 25

2:20 pm - 9:40 pmLHR-ONT

14h 20m1 stop

11:01 am - 8:05 amONT-LHR

13h 04m1 stop

$648British Airways

Find Deal

Tue, Mar 17 - Tue, Apr 14

12:30 pm - 12:03 pmLGW-ONT

31h 33m2 stops

6:11 am - 7:30 amONT-LGW

17h 19m2 stops

$664American Airlines

Find Deal

Mon, Nov 17 - Tue, Dec 2

3:00 pm - 10:48 pmLHR-ONT

15h 48m1 stop

10:59 am - 10:00 amONT-LHR

15h 01m1 stop

$666British Airways

Find Deal

Wed, Feb 11 - Mon, Feb 23

11:55 am - 10:37 pmLGW-ONT

17h 42m2 stops

6:00 am - 10:55 amONT-LGW

21h 55m2 stops

$905Multiple Airlines

Find Deal

Tue, Mar 10 - Thu, Mar 19

Virgin Atlantic flights from London to Ontario

Our best Virgin Atlantic deals on London to Ontario flight tickets

Virgin Atlantic

Feb 26

LHR6:30 amLondon Heathrow

24h 08m

2 stops

ONT10:38 pmOntario

Mar 2

ONT6:45 amOntario

22h 05m

1 stop

LHR12:50 pmLondon Heathrow

$561

Find similar

Virgin Atlantic

Feb 26

LHR10:10 amLondon Heathrow

21h 42m

2 stops

ONT11:52 pmOntario

Mar 2

ONT6:00 amOntario

16h 20m

2 stops

LHR6:20 amLondon Heathrow

$588

Find similar

Virgin Atlantic

Feb 26

LHR10:45 amLondon Heathrow

13h 34m

1 stop

ONT4:19 pmOntario

Mar 2

ONT1:00 pmOntario

13h 00m

1 stop

LHR10:00 amLondon Heathrow

$598

Find similar

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

Mar 31

LHR10:55 amLondon Heathrow

13h 24m

1 stop

ONT4:19 pmOntario

Apr 7

ONT1:00 pmOntario

12h 50m

1 stop

LHR9:50 amLondon Heathrow

$578

Find similar

KLM

Mar 16

LHR2:45 pmLondon Heathrow

14h 53m

1 stop

ONT10:38 pmOntario

Mar 31

ONT1:00 pmOntario

12h 50m

1 stop

LHR9:50 amLondon Heathrow

$597

Find similar

KLM

Apr 6

LHR11:20 amLondon Heathrow

13h 55m

1 stop

ONT5:15 pmOntario

Apr 20

ONT1:00 pmOntario

12h 50m

1 stop

LHR9:50 amLondon Heathrow

$604

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

6:30 am-10:38 pm

2 stops24h 08m

Ontario

Mon 3/2

6:45 am-12:50 pm

1 stop22h 05m

$561

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 2/26

6:30 am-9:14 pm

2 stops22h 44m

Ontario

Mon 3/2

5:05 pm-10:00 am

1 stop32h 55m

$571

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/31

10:55 am-4:19 pm

1 stop13h 24m

Ontario

Tue 4/7

1:00 pm-9:50 am

1 stop12h 50m

$578

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 3/16

2:45 pm-10:38 pm

1 stop14h 53m

Ontario

Tue 3/31

1:00 pm-9:50 am

1 stop12h 50m

$597

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Thu 2/26

12:30 pm-1:57 pm

2 stops33h 27m

Ontario

Mon 3/2

4:59 pm-7:30 am

2 stops30h 31m

$616

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Sat 3/21

3:05 pm-10:38 pm

1 stop14h 33m

Ontario

Wed 3/25

1:00 pm-9:00 am

1 stop13h 00m

$640

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 3/17

2:20 pm-9:40 pm

1 stop14h 20m

Ontario

Tue 4/14

11:01 am-8:05 am

1 stop13h 04m

$648

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Mon 11/17

12:30 pm-12:03 pm

2 stops31h 33m

Ontario

Tue 12/2

6:11 am-7:30 am

2 stops17h 19m

$664

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 2/11

3:00 pm-10:48 pm

1 stop15h 48m

Ontario

Mon 2/23

10:59 am-10:00 am

1 stop15h 01m

$666

LondonOntario

LGW - ONT

LGWONT

London Gatwick

Tue 3/10

11:55 am-10:37 pm

2 stops17h 42m

Ontario

Thu 3/19

6:00 am-10:55 am

2 stops21h 55m

$905

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, September 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 $552. If you aren’t able to travel during the month of September, then book flights to Ontario from London during January instead. Flights to Ontario in January, while not as cheap as those in September, still average around $557.

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 $718 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 $543 on momondo.

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

Direct flights	None

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 24m 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 October 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 8,998 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.