Which stopover airport has the shortest connection time from London to Ontario?

Denver (DEN) has the shortest average stopover time for this route: 1h 18m.

Which stopover airport has the shortest travel time from London to Ontario?

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 13h 39m.

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

Which stopover airport offers the lowest fares from London to Ontario?

Flights via Seattle (SEA) offer the lowest average return price of £434.

Which airlines fly to Ontario?

Virgin Atlantic, British Airways and Lufthansa are the top three most popular airlines that fly to Ontario from London according to our data. Virgin Atlantic is the first choice among our users, with 45% of people opting to fly with this airline when travelling to Ontario. Keep in mind that there are 21 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

Dallas (DFW) was the most common stop: 42% of momondo users choosing one-stop flights on this route connected there.

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

Prices for flights from London to Ontario Airport are refreshed on a daily basis.

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

As of October 2025, there are 6 operators 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.

£260 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 £445 to £609. The lowest price recently found on this route was £424.

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from London to Los Angeles

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

06:30 - 22:38LHR-ONT

24h 08m2 stops

06:00 - 10:15ONT-LHR

20h 15m2 stops

£424Virgin Atlantic

Find Deal

Thu, 26 Feb - Mon, 2 Mar

06:30 - 22:38LHR-ONT

24h 08m2 stops

06:45 - 12:50ONT-LHR

22h 05m1 stop

£426Virgin Atlantic

Find Deal

Thu, 26 Feb - Mon, 2 Mar

11:45 - 11:38LHR-ONT

31h 53m2 stops

06:45 - 10:30ONT-LHR

19h 45m1 stop

£437Delta

Find Deal

Thu, 26 Feb - Mon, 2 Mar

11:20 - 17:15LHR-ONT

13h 55m1 stop

13:00 - 09:50ONT-LHR

12h 50m1 stop

£439KLM

Find Deal

Tue, 31 Mar - Tue, 7 Apr

10:55 - 21:14LHR-ONT

18h 19m1 stop

11:55 - 09:00ONT-LHR

13h 05m1 stop

£451Delta

Find Deal

Wed, 1 Apr - Thu, 16 Apr

11:20 - 17:15LHR-ONT

13h 55m1 stop

13:00 - 09:50ONT-LHR

12h 50m1 stop

£460KLM

Find Deal

Mon, 6 Apr - Wed, 15 Apr

14:20 - 21:40LHR-ONT

14h 20m1 stop

11:01 - 08:05ONT-LHR

13h 04m1 stop

£492British Airways

Find Deal

Tue, 17 Mar - Tue, 14 Apr

13:45 - 22:49LHR-ONT

17h 04m1 stop

13:34 - 09:40ONT-LHR

12h 06m1 stop

£499United Airlines

Find Deal

Tue, 9 Dec - Mon, 15 Dec

10:05 - 18:17LHR-ONT

16h 12m1 stop

12:45 - 10:00ONT-LHR

13h 15m1 stop

£500British Airways

Find Deal

Mon, 8 Dec - Tue, 23 Dec

10:05 - 17:51LHR-ONT

15h 46m1 stop

13:24 - 09:40ONT-LHR

12h 16m1 stop

£502United Airlines

Find Deal

Tue, 20 Jan - Mon, 2 Feb

Virgin Atlantic flights from London to Ontario

Our best Virgin Atlantic deals on London to Ontario flight tickets

Virgin Atlantic

26 Feb

LHR06:30London Heathrow

24h 08m

2 stops

ONT22:38Ontario

2 Mar

ONT06:00Ontario

20h 15m

2 stops

LHR10:15London Heathrow

£424

Find similar

Virgin Atlantic

26 Feb

LHR06:30London Heathrow

24h 08m

2 stops

ONT22:38Ontario

2 Mar

ONT06:45Ontario

22h 05m

1 stop

LHR12:50London Heathrow

£426

Find similar

Virgin Atlantic

26 Feb

LHR10:45London Heathrow

13h 34m

1 stop

ONT16:19Ontario

2 Mar

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

£454

Find similar

KLM flights from London to Ontario

Our best KLM deals on London to Ontario flight tickets

KLM

31 Mar

LHR11:20London Heathrow

13h 55m

1 stop

ONT17:15Ontario

7 Apr

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

£439

Find similar

KLM

6 Apr

LHR11:20London Heathrow

13h 55m

1 stop

ONT17:15Ontario

15 Apr

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

£460

Find similar

KLM

7 Apr

LHR11:20London Heathrow

13h 55m

1 stop

ONT17:15Ontario

21 Apr

ONT13:00Ontario

12h 50m

1 stop

LHR09:50London Heathrow

£470

Find similar

Fly from

Fly to

Route

Depart

Return

Price

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

06:30-22:38

2 stops24h 08m

Ontario

Mon 2/3

06:00-10:15

2 stops20h 15m

£424

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

06:30-22:38

2 stops24h 08m

Ontario

Mon 2/3

06:45-12:50

1 stop22h 05m

£426

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Thu 26/2

11:45-11:38

2 stops31h 53m

Ontario

Mon 2/3

06:45-10:30

1 stop19h 45m

£437

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 31/3

11:20-17:15

1 stop13h 55m

Ontario

Tue 7/4

13:00-09:50

1 stop12h 50m

£439

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 1/4

10:55-21:14

1 stop18h 19m

Ontario

Thu 16/4

11:55-09:00

1 stop13h 05m

£451

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 6/4

11:20-17:15

1 stop13h 55m

Ontario

Wed 15/4

13:00-09:50

1 stop12h 50m

£460

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 17/3

14:20-21:40

1 stop14h 20m

Ontario

Tue 14/4

11:01-08:05

1 stop13h 04m

£492

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 9/12

13:45-22:49

1 stop17h 04m

Ontario

Mon 15/12

13:34-09:40

1 stop12h 06m

£499

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 8/12

10:05-18:17

1 stop16h 12m

Ontario

Tue 23/12

12:45-10:00

1 stop13h 15m

£500

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 20/1

10:05-17:51

1 stop15h 46m

Ontario

Mon 2/2

13:24-09:40

1 stop12h 16m

£502

Flights are sorted by cheapest return 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

Stopovers

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

What is the cheapest month to fly to Ontario?

The month of September is, on average, the cheapest month to fly to Ontario from London, with most prices found around £419. If you’re not able to fly to Ontario in September, then January is your next best option. Flight prices from London to Ontario during January average around £423.

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 Wednesday when prices can be found for as low as £499. This is often the case because there is less demand to fly during this day of the week. Flights from London to Ontario on a Sunday will generally be more expensive and average around £577. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Flying to Ontario from London in the evening is the least expensive time of day to depart. momondo users have found prices as low as £488 when looking at flights departing in the evening. In contrast, the most expensive time of day to depart to Ontario is at midday when prices are around £574.

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 £545 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from London for as low as £412 on momondo.

Can stopping save me money on London to Ontario flights?

You could potentially save up to 2% 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 return 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?
There are 5417.5 mi between London and Ontario. Flights usually cover this in 13h 34m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London to Ontario Airport?
Prices for flights from London to Ontario Airport are refreshed on a daily basis.
How many operators does momondo search for flights from London to Ontario Airport?
As of October 2025, there are 6 operators 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.
What is the most popular airline from London to Ontario?
momondo data reveals that the most frequently booked airline on the route from London to Ontario is British Airways, representing 41% of all bookings. The subsequent popular airlines are Virgin Atlantic at 22%, United Airlines at 14%, and Lufthansa at 10%.

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
Finnair	PriceFrom £285	Free Cancellation	Rating 7.6 1,333 reviews	Search Finnair flights
British Airways	PriceFrom £387	Free Cancellation	Rating 6.7 7,487 reviews	Search British Airways flights
United Airlines	PriceFrom £393	Free Cancellation	Rating 7.4 8,998 reviews	Search United Airlines flights
KLM	PriceFrom £402	Free Cancellation	Rating 7.7 1,406 reviews	Search KLM flights
Virgin Atlantic	PriceFrom £420	Free Cancellation	Rating 7.5 670 reviews	Search Virgin Atlantic flights
Lufthansa	PriceFrom £439	Free Cancellation	Rating 6.8 7,541 reviews	Search Lufthansa flights

Why use momondo?

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

Finding the right flight to Ontario from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to Ontario from London with this policy.

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?

If you are not ready to book a flight from London to Ontario now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ontario and let you know when they change.