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

Alaska Airlines 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.

€412 Cheap Flights from London to Ontario in 2026

Find the cheapest flights from London to Los Angeles

Return

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

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

17h 40m1 stop Houston George Bush Intcntl

€484United Airlines

Wed, 18 Nov - Thu, 19 Nov

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

€485United Airlines

Wed, 18 Nov - Thu, 19 Nov

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

19h 21m2 stops Zurich San Francisco

05:00 - 09:20ONT Ontario-LHR London Heathrow

20h 20m2 stops Denver Intl Newark

€485United Airlines

Mon, 21 Sep - Sun, 4 Oct

07:25 - 20:58LHR London Heathrow-ONT Ontario

21h 33m2 stops Munich Franz Josef Strauss Denver Intl

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

21h 40m1 stop Denver Intl

€486United Airlines

Sat, 24 Oct - Sat, 31 Oct

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

19h 16m2 stops Zurich San Francisco

19:13 - 21:35ONT Ontario-LHR London Heathrow

18h 22m2 stops San Francisco Newark

€488United Airlines

Thu, 10 Sep - Sun, 20 Sep

07:30 - 20:58LHR London Heathrow-ONT Ontario

21h 28m2 stops Frankfurt am Main Denver Intl

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

21h 40m1 stop Denver Intl

€489United Airlines

Sat, 24 Oct - Fri, 30 Oct

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

22h 19m2 stops Zurich San Francisco

06:08 - 07:25ONT Ontario-LHR London Heathrow

17h 17m1 stop San Francisco

€492United Airlines

Fri, 4 Sep - Mon, 7 Sep

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

18h 46m2 stops Munich Franz Josef Strauss San Francisco

06:08 - 11:10ONT Ontario-LHR London Heathrow

21h 02m1 stop San Francisco

€496United Airlines

Sun, 30 Aug - Fri, 11 Sep

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

19h 16m2 stops Zurich San Francisco

19:13 - 21:35ONT Ontario-LHR London Heathrow

18h 22m2 stops San Francisco Newark

€500United Airlines

Thu, 10 Sep - Sun, 20 Sep

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

19h 16m2 stops Zurich San Francisco

07:00 - 08:30ONT Ontario-LHR London Heathrow

17h 30m1 stop Chicago O'Hare Intl

€505United Airlines

Thu, 10 Sep - Wed, 23 Sep

Cheap last-minute flights

Enter your travel dates to find the best prices.

11:25 - 20:53LHR London Heathrow-ONT Ontario

17h 28m1 stop Denver Intl

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

12h 22m1 stop Denver Intl

€597United Airlines

Sat, 15 Aug - Sat, 22 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

€598United Airlines

Mon, 17 Aug - Mon, 24 Aug

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

€628United Airlines

Mon, 17 Aug - Mon, 24 Aug

16:15 - 22:59LHR London Heathrow-ONT Ontario

14h 44m1 stop San Francisco

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

14h 24m1 stop San Francisco

€629United Airlines

Fri, 14 Aug - Fri, 21 Aug

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

€645United Airlines

Thu, 13 Aug - Sun, 16 Aug

11:05 - 20:53LHR London Heathrow-ONT Ontario

17h 48m2 stops Chicago O'Hare Intl Denver Intl

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

12h 22m1 stop Denver Intl

€646United Airlines

Sat, 15 Aug - Mon, 31 Aug

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

14h 03m1 stop Denver Intl

13:18 - 12:35ONT Ontario-LHR London Heathrow

15h 17m1 stop Denver Intl

€652United Airlines

Sat, 15 Aug - Sun, 16 Aug

13:40 - 21:59LHR London Heathrow-ONT Ontario

16h 19m1 stop Houston George Bush Intcntl

07:00 - 09:00ONT Ontario-LHR London Heathrow

18h 00m1 stop Chicago O'Hare Intl

€672United Airlines

Sun, 16 Aug - Sun, 23 Aug

11:40 - 22:45LHR London Heathrow-ONT Ontario

19h 05m1 stop Seattle/Tacoma Intl

13:06 - 10:00ONT Ontario-LHR London Heathrow

12h 54m1 stop Salt Lake City

€678Delta

Fri, 14 Aug - Fri, 21 Aug

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

14h 03m1 stop Denver Intl

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

14h 24m1 stop San Francisco

€679United Airlines

Thu, 13 Aug - Wed, 19 Aug

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Delta flights from London to Ontario

Our best Delta deals on London to Ontario flight tickets

Delta

23 Nov

LHR06:30London Heathrow

18h 43m

2 stops

ONT17:13Ontario

7 Dec

ONT11:57Ontario

14h 43m

1 stop

LHR10:40London Heathrow

€520

Delta

25 Sept

LHR09:55London Heathrow

21h 52m

2 stops

ONT23:47Ontario

2 Oct

ONT11:54Ontario

19h 41m

1 stop

LHR15:35London Heathrow

€523

Delta

29 Aug

LHR06:30London Heathrow

23h 53m

2 stops

ONT22:23Ontario

10 Sept

ONT06:00Ontario

23h 15m

2 stops

LHR13:15London Heathrow

€528

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

18 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

19 Nov

ONT06:00Ontario

30h 35m

2 stops

LHR20:35London Heathrow

€484

United Airlines

18 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

19 Nov

ONT06:00Ontario

17h 40m

1 stop

LHR07:40London Heathrow

€485

United Airlines

21 Sept

LHR08:40London Heathrow

19h 21m

2 stops

ONT20:01Ontario

4 Oct

ONT05:00Ontario

20h 20m

2 stops

LHR09:20London Heathrow

€485

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

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

€484

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

€485

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 21/9

08:40-20:01

2 stops19h 21m

Ontario

Sun 4/10

05:00-09:20

2 stops20h 20m

€485

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 24/10

07:25-20:58

2 stops21h 33m

Ontario

Sat 31/10

05:00-09:40

1 stop21h 40m

€486

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 10/9

08:45-20:01

2 stops19h 16m

Ontario

Sun 20/9

19:13-21:35

2 stops18h 22m

€488

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 24/10

07:30-20:58

2 stops21h 28m

Ontario

Fri 30/10

05:00-09:40

1 stop21h 40m

€489

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 4/9

08:40-22:59

2 stops22h 19m

Ontario

Mon 7/9

06:08-07:25

1 stop17h 17m

€492

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sun 30/8

07:25-18:11

2 stops18h 46m

Ontario

Fri 11/9

06:08-11:10

1 stop21h 02m

€496

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 10/9

08:45-20:01

2 stops19h 16m

Ontario

Sun 20/9

19:13-21:35

2 stops18h 22m

€500

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 10/9

08:45-20:01

2 stops19h 16m

Ontario

Wed 23/9

07:00-08:30

1 stop17h 30m

€505

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 €574 to €651.
The lowest price recently found on this route was €484.

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 €518.

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	14h 11m
Direct flights	None

The fastest flight from London to Ontario takes 14h 11m

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 14h 11m 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.