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

Alaska Airlines, British Airways, and United 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.

€409 Cheap Flights from London to Ontario in 2026

Find the cheapest flights from London to Los Angeles

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One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

09:00 - 20:15LHR London Heathrow-ONT Ontario

19h 15m2 stops Zurich San Francisco

13:33 - 11:15ONT Ontario-LHR London Heathrow

13h 42m1 stop San Francisco

€482United Airlines

Wed, 4 Nov - Fri, 4 Dec

09:00 - 20:15LHR London Heathrow-ONT Ontario

19h 15m2 stops Zurich San Francisco

06:00 - 11:05ONT Ontario-LHR London Heathrow

21h 05m2 stops Houston George Bush Intcntl Newark

€483United Airlines

Wed, 18 Nov - Thu, 19 Nov

08:45 - 20:01LHR London Heathrow-ONT Ontario

19h 16m2 stops Zurich San Francisco

13:56 - 14:10ONT Ontario-LHR London Heathrow

16h 14m1 stop San Francisco

€483United Airlines

Thu, 3 Sep - Wed, 16 Sep

07:25 - 18:11LHR London Heathrow-ONT Ontario

18h 46m2 stops Munich Franz Josef Strauss San Francisco

08:00 - 07:25ONT Ontario-LHR London Heathrow

15h 25m1 stop San Francisco

€486United Airlines

Sun, 6 Sep - Sat, 12 Sep

07:30 - 20:20LHR London Heathrow-ONT Ontario

20h 50m2 stops Frankfurt am Main Denver Intl

05:00 - 09:40ONT Ontario-LHR London Heathrow

20h 40m1 stop Denver Intl

€487United Airlines

Fri, 11 Dec - Fri, 1 Jan

07:30 - 20:31LHR London Heathrow-ONT Ontario

21h 01m2 stops Frankfurt am Main San Francisco

13:22 - 12:25ONT Ontario-LHR London Heathrow

15h 03m1 stop Denver Intl

€488United Airlines

Thu, 24 Sep - Tue, 29 Sep

09:30 - 20:15LHR London Heathrow-ONT Ontario

18h 45m2 stops Frankfurt am Main San Francisco

06:45 - 09:10ONT Ontario-LHR London Heathrow

18h 25m2 stops Chicago O'Hare Intl Newark

€495United Airlines

Fri, 20 Nov - Sat, 5 Dec

09:00 - 20:15LHR London Heathrow-ONT Ontario

19h 15m2 stops Zurich San Francisco

06:00 - 07:40ONT Ontario-LHR London Heathrow

17h 40m1 stop Houston George Bush Intcntl

€496United Airlines

Wed, 18 Nov - Thu, 19 Nov

08:40 - 22:59LHR London Heathrow-ONT Ontario

22h 19m2 stops Zurich San Francisco

05:00 - 06:45ONT Ontario-LHR London Heathrow

17h 45m2 stops Denver Intl Chicago O'Hare Intl

€498United Airlines

Fri, 4 Sep - Mon, 7 Sep

08:40 - 20:01LHR London Heathrow-ONT Ontario

19h 21m2 stops Zurich San Francisco

07:00 - 06:55ONT Ontario-LHR London Heathrow

15h 55m2 stops Chicago O'Hare Intl Washington, D.C. Dulles Intl

€501United Airlines

Wed, 2 Sep - Wed, 9 Sep

Cheap last-minute flights

Enter your travel dates to find the best prices.

14:50 - 20:53LHR London Heathrow-ONT Ontario

14h 03m1 stop Denver Intl

13:18 - 12:25ONT Ontario-LHR London Heathrow

15h 07m1 stop Denver Intl

€602United Airlines

Wed, 12 Aug - Mon, 31 Aug

06:50 - 22:35LHR London Heathrow-ONT Ontario

23h 45m2 stops Brussels Bruxelles-National Chicago O'Hare Intl

09:01 - 11:55ONT Ontario-LHR London Heathrow

18h 54m2 stops San Francisco Chicago O'Hare Intl

€611United Airlines

Wed, 12 Aug - Tue, 18 Aug

14:50 - 20:53LHR London Heathrow-ONT Ontario

14h 03m1 stop Denver Intl

13:18 - 09:40ONT Ontario-LHR London Heathrow

12h 22m1 stop Denver Intl

€614United Airlines

Wed, 12 Aug - Mon, 17 Aug

14:50 - 20:53LHR London Heathrow-ONT Ontario

14h 03m1 stop Denver Intl

08:03 - 11:35ONT Ontario-LHR London Heathrow

19h 32m2 stops San Francisco Houston George Bush Intcntl

€624United Airlines

Tue, 11 Aug - Sat, 26 Sep

14:10 - 22:51LHR London Heathrow-ONT Ontario

16h 41m1 stop Chicago O'Hare Intl

13:18 - 09:40ONT Ontario-LHR London Heathrow

12h 22m1 stop Denver Intl

€626United Airlines

Mon, 10 Aug - Mon, 17 Aug

08:00 - 20:01LHR London Heathrow-ONT Ontario

20h 01m2 stops Chicago O'Hare Intl San Francisco

05:00 - 05:55ONT Ontario-LHR London Heathrow

16h 55m2 stops Denver Intl Newark

€628United Airlines

Wed, 12 Aug - Thu, 24 Sep

14:50 - 20:53LHR London Heathrow-ONT Ontario

14h 03m1 stop Denver Intl

13:56 - 11:10ONT Ontario-LHR London Heathrow

13h 14m1 stop San Francisco

€638United Airlines

Tue, 11 Aug - Sun, 16 Aug

14:50 - 20:42LHR London Heathrow-ONT Ontario

13h 52m1 stop Denver Intl

13:18 - 09:40ONT Ontario-LHR London Heathrow

12h 22m1 stop Denver Intl

€643United Airlines

Sat, 8 Aug - Fri, 28 Aug

13:40 - 21:55LHR London Heathrow-ONT Ontario

16h 15m1 stop Houston George Bush Intcntl

07:00 - 06:45ONT Ontario-LHR London Heathrow

15h 45m1 stop Chicago O'Hare Intl

€644United Airlines

Mon, 10 Aug - Sun, 16 Aug

14:10 - 22:51LHR London Heathrow-ONT Ontario

16h 41m1 stop Chicago O'Hare Intl

09:01 - 07:25ONT Ontario-LHR London Heathrow

14h 24m1 stop San Francisco

€645United Airlines

Mon, 10 Aug - Mon, 24 Aug

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Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

12 Dec

LHR10:45London Heathrow

13h 45m

1 stop

ONT16:30Ontario

8 Jan

ONT12:00Ontario

13h 00m

1 stop

LHR09:00London Heathrow

€534

Delta

10 Dec

LHR20:10London Heathrow

30h 21m

2 stops

ONT18:31Ontario

31 Dec

ONT22:59Ontario

24h 56m

2 stops

LHR07:55London Heathrow

€535

Delta

10 Dec

LHR20:10London Heathrow

30h 21m

2 stops

ONT18:31Ontario

30 Dec

ONT11:55Ontario

14h 45m

1 stop

LHR10:40London Heathrow

€535

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

4 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

4 Dec

ONT13:33Ontario

13h 42m

1 stop

LHR11:15London Heathrow

€482

United Airlines

18 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

19 Nov

ONT06:00Ontario

21h 05m

2 stops

LHR11:05London Heathrow

€483

United Airlines

3 Sept

LHR08:45London Heathrow

19h 16m

2 stops

ONT20:01Ontario

16 Sept

ONT05:00Ontario

18h 15m

2 stops

LHR07:15London Heathrow

€483

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 4/11

09:00-20:15

2 stops19h 15m

Ontario

Fri 4/12

13:33-11:15

1 stop13h 42m

€482

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 18/11

09:00-20:15

2 stops19h 15m

Ontario

Thu 19/11

06:00-11:05

2 stops21h 05m

€483

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 3/9

08:45-20:01

2 stops19h 16m

Ontario

Wed 16/9

13:56-14:10

1 stop16h 14m

€483

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sun 6/9

07:25-18:11

2 stops18h 46m

Ontario

Sat 12/9

08:00-07:25

1 stop15h 25m

€486

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 11/12

07:30-20:20

2 stops20h 50m

Ontario

Fri 1/1

05:00-09:40

1 stop20h 40m

€487

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 24/9

07:30-20:31

2 stops21h 01m

Ontario

Tue 29/9

13:22-12:25

1 stop15h 03m

€488

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 20/11

09:30-20:15

2 stops18h 45m

Ontario

Sat 5/12

06:45-09:10

2 stops18h 25m

€495

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 18/11

09:00-20:15

2 stops19h 15m

Ontario

Thu 19/11

06:00-07:40

1 stop17h 40m

€496

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 4/9

08:40-22:59

2 stops22h 19m

Ontario

Mon 7/9

05:00-06:45

2 stops17h 45m

€498

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 2/9

08:40-20:01

2 stops19h 21m

Ontario

Wed 9/9

07:00-06:55

2 stops15h 55m

€501

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?

Prices are currently low for flights on this route.

Typical prices usually range from €560 to €649.
The lowest price recently found on this route was €482.

What is the cheapest month to fly to Ontario?

If you don’t want to visit Ontario in January, then you should wait until February to fly from London, when ticket prices are also cheap, with an average price of €517.

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	27h 05m
Direct flights	None

The fastest flight from London to Ontario takes 27h 05m

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

Search flight deals

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 27h 05m 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.