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

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

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

Prices for flights from London to Ontario Airport were last updated today.

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

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 London to Ontario Airport.

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

The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

€432 Cheap Flights from London to Ontario in 2026

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 €674 to €488. The lowest price recently found on this route was €588.

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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.

14:50 - 20:53

LHR

ONT

14h 03m

1 stop

13:18 - 09:40

ONT

LHR

12h 22m

1 stop

€588United Airlines

Tue, 15 Sep - Thu, 24 Sep

15:00 - 23:06

LHR

ONT

15h 06m

1 stop

14:59 - 12:00

ONT

LHR

13h 01m

1 stop

€618British Airways

Wed, 28 Oct - Wed, 11 Nov

09:15 - 22:34

LHR

ONT

21h 19m

1 stop

05:34 - 09:00

ONT

LHR

19h 26m

1 stop

€619British Airways

Wed, 8 Jul - Mon, 13 Jul

11:00 - 18:18

LHR

ONT

15h 18m

1 stop

16:07 - 15:05

ONT

LHR

14h 58m

1 stop

€620British Airways

Mon, 3 Aug - Mon, 24 Aug

14:25 - 22:32

LHR

ONT

16h 07m

1 stop

16:07 - 15:05

ONT

LHR

14h 58m

1 stop

€621British Airways

Wed, 15 Jul - Thu, 6 Aug

11:45 - 22:41

LHR

ONT

18h 56m

2 stops

06:00 - 11:00

ONT

LHR

21h 00m

1 stop

€630Delta

Tue, 16 Jun - Tue, 30 Jun

12:00 - 22:34

LHR

ONT

18h 34m

1 stop

10:25 - 12:00

ONT

LHR

17h 35m

2 stops

€633British Airways

Wed, 15 Jul - Mon, 27 Jul

12:00 - 22:34

LHR

ONT

18h 34m

1 stop

07:06 - 06:20

ONT

LHR

15h 14m

1 stop

€635British Airways

Tue, 4 Aug - Thu, 27 Aug

08:40 - 21:48

LHR

ONT

21h 08m

2 stops

18:01 - 15:35

ONT

LHR

13h 34m

1 stop

€637Delta

Mon, 22 Jun - Tue, 18 Aug

19:30 - 22:39

LHR

ONT

35h 09m

2 stops

05:34 - 09:00

ONT

LHR

19h 26m

1 stop

€640British Airways

Mon, 15 Jun - Tue, 21 Jul

Alaska Airlines flights from London to Ontario

Our best Alaska Airlines deals on London to Ontario flight tickets

Alaska Airlines

15 Aug

LHR17:00London Heathrow

14h 11m

1 stop

ONT23:11Ontario

9 Oct

ONT14:14Ontario

16h 51m

1 stop

LHR15:05London Heathrow

€657

Alaska Airlines

4 Oct

LHR17:00London Heathrow

14h 42m

1 stop

ONT23:42Ontario

13 Oct

ONT14:14Ontario

16h 51m

1 stop

LHR15:05London Heathrow

€661

Alaska Airlines

7 Jun

LHR17:00London Heathrow

14h 58m

1 stop

ONT23:58Ontario

21 Nov

ONT12:00Ontario

16h 20m

1 stop

LHR12:20London Heathrow

€662

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

15 Sept

LHR14:50London Heathrow

14h 03m

1 stop

ONT20:53Ontario

24 Sept

ONT13:18Ontario

12h 22m

1 stop

LHR09:40London Heathrow

€588

United Airlines

9 Sept

LHR11:05London Heathrow

16h 52m

1 stop

ONT19:57Ontario

19 Sept

ONT07:00Ontario

15h 45m

1 stop

LHR06:45London Heathrow

€658

United Airlines

15 Jun

LHR16:15London Heathrow

14h 22m

1 stop

ONT22:37Ontario

18 Jun

ONT18:30Ontario

31h 10m

1 stop

LHR09:40London Heathrow

€713

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 15/9

14:50-20:53

1 stop14h 03m

Ontario

Thu 24/9

13:18-09:40

1 stop12h 22m

€588

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 28/10

15:00-23:06

1 stop15h 06m

Ontario

Wed 11/11

14:59-12:00

1 stop13h 01m

€618

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 8/7

09:15-22:34

1 stop21h 19m

Ontario

Mon 13/7

05:34-09:00

1 stop19h 26m

€619

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 3/8

11:00-18:18

1 stop15h 18m

Ontario

Mon 24/8

16:07-15:05

1 stop14h 58m

€620

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/7

14:25-22:32

1 stop16h 07m

Ontario

Thu 6/8

16:07-15:05

1 stop14h 58m

€621

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 16/6

11:45-22:41

2 stops18h 56m

Ontario

Tue 30/6

06:00-11:00

1 stop21h 00m

€630

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Wed 15/7

12:00-22:34

1 stop18h 34m

Ontario

Mon 27/7

10:25-12:00

2 stops17h 35m

€633

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Tue 4/8

12:00-22:34

1 stop18h 34m

Ontario

Thu 27/8

07:06-06:20

1 stop15h 14m

€635

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 22/6

08:40-21:48

2 stops21h 08m

Ontario

Tue 18/8

18:01-15:35

1 stop13h 34m

€637

LondonOntario

LHR - ONT

LHRONT

London Heathrow

Mon 15/6

19:30-22:39

2 stops35h 09m

Ontario

Tue 21/7

05:34-09:00

1 stop19h 26m

€640

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

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

What is the cheapest month to fly to Ontario?

If you don’t want to visit Ontario in March, then you should wait until February to fly from London, when ticket prices are also cheap, with an average price of €358.

How far in advance should I book a flight from London 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 €562 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 €425 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 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

Fastest flight time	31h 30m
Direct flights	None

The fastest flight from London to Ontario takes 31h 30m

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

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Frequently asked questions about flying from London to Ontario

How far is London to Ontario by plane?
A flight from London to Ontario will travel around 8718.6 km. Typically, this will take 31h 30m 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 were last updated today.
How old do you have to be to fly from London to Ontario Airport?
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 London to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ontario from London.

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

If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario from London and alert you when they change.