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

Alaska Airlines and British Airways 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.

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

19h 16m2 stops Zurich San Francisco

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

20h 40m1 stop Denver Intl

€440United Airlines

Tue, 15 Sep - Mon, 30 Nov

07:25 - 17:41LHR London Heathrow-ONT Ontario

18h 16m2 stops Munich Franz Josef Strauss San Francisco

06:00 - 08:25ONT Ontario-LHR London Heathrow

19h 25m2 stops Houston George Bush Intcntl Newark

€445United Airlines

Tue, 13 Oct - Sun, 25 Oct

07:25 - 20:01LHR London Heathrow-ONT Ontario

20h 36m2 stops Munich Franz Josef Strauss San Francisco

13:35 - 07:25ONT Ontario-LHR London Heathrow

33h 50m1 stop San Francisco

€445United Airlines

Tue, 15 Sep - Mon, 30 Nov

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

17h 45m2 stops Frankfurt am Main San Francisco

13:00 - 09:40ONT Ontario-LHR London Heathrow

12h 40m1 stop Denver Intl

€446United Airlines

Mon, 26 Oct - Fri, 8 Jan

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

20h 50m3 stops Frankfurt am Main Newark Denver Intl

06:00 - 09:40ONT Ontario-LHR London Heathrow

19h 40m2 stops San Francisco Denver Intl

€453United Airlines

Thu, 21 Jan - Mon, 25 Jan

14:50 - 20:58LHR London Heathrow-ONT Ontario

14h 08m1 stop Denver Intl

13:29 - 09:40ONT Ontario-LHR London Heathrow

13h 11m1 stop Denver Intl

€473United Airlines

Sat, 24 Oct - Sat, 31 Oct

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

14h 03m1 stop Denver Intl

13:24 - 09:40ONT Ontario-LHR London Heathrow

12h 16m1 stop Denver Intl

€474United Airlines

Wed, 16 Sep - Wed, 30 Sep

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

€475United Airlines

Thu, 10 Sep - Wed, 23 Sep

11:45 - 17:12LHR London Heathrow-ONT Ontario

37h 27m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

06:00 - 07:05ONT Ontario-LHR London Heathrow

17h 05m2 stops Salt Lake City Minneapolis St Paul

€476Delta

Thu, 22 Oct - Sun, 1 Nov

06:30 - 17:12LHR London Heathrow-ONT Ontario

18h 42m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

13:15 - 10:00ONT Ontario-LHR London Heathrow

12h 45m1 stop Salt Lake City

€477Delta

Mon, 12 Oct - Mon, 9 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

17:00 - 11:04LHR London Heathrow-ONT Ontario

26h 04m1 stop Seattle/Tacoma Intl

15:14 - 15:05ONT Ontario-LHR London Heathrow

15h 51m1 stop Seattle/Tacoma Intl

€640Alaska Airlines

Wed, 2 Sep - Mon, 14 Sep

17:00 - 11:04LHR London Heathrow-ONT Ontario

26h 04m1 stop Seattle/Tacoma Intl

15:14 - 15:05ONT Ontario-LHR London Heathrow

15h 51m1 stop Seattle/Tacoma Intl

€642Alaska Airlines

Wed, 2 Sep - Sat, 12 Sep

17:00 - 19:03LHR London Heathrow-ONT Ontario

34h 03m1 stop Seattle/Tacoma Intl

15:14 - 15:05ONT Ontario-LHR London Heathrow

15h 51m1 stop Seattle/Tacoma Intl

€704Alaska Airlines

Tue, 1 Sep - Sat, 26 Sep

17:00 - 11:04LHR London Heathrow-ONT Ontario

26h 04m1 stop Seattle/Tacoma Intl

15:14 - 15:05ONT Ontario-LHR London Heathrow

15h 51m1 stop Seattle/Tacoma Intl

€705Alaska Airlines

Wed, 2 Sep - Wed, 9 Sep

17:00 - 19:03LHR London Heathrow-ONT Ontario

34h 03m1 stop Seattle/Tacoma Intl

15:14 - 15:05ONT Ontario-LHR London Heathrow

15h 51m1 stop Seattle/Tacoma Intl

€723Alaska Airlines

Wed, 2 Sep - Wed, 9 Sep

17:00 - 19:03LHR London Heathrow-ONT Ontario

34h 03m1 stop Seattle/Tacoma Intl

12:12 - 15:05ONT Ontario-LHR London Heathrow

18h 53m1 stop Seattle/Tacoma Intl

€724Alaska Airlines

Tue, 1 Sep - Tue, 8 Sep

10:55 - 22:23LHR London Heathrow-ONT Ontario

19h 28m1 stop Salt Lake City

18:00 - 15:35ONT Ontario-LHR London Heathrow

13h 35m1 stop Seattle/Tacoma Intl

€725Delta

Tue, 1 Sep - Sat, 12 Sep

10:35 - 18:11LHR London Heathrow-ONT Ontario

15h 36m1 stop San Francisco

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

12h 22m1 stop Denver Intl

€727United Airlines

Tue, 1 Sep - Mon, 7 Sep

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

16h 19m1 stop Houston George Bush Intcntl

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

12h 22m1 stop Denver Intl

€728United Airlines

Mon, 31 Aug - Mon, 7 Sep

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

14h 44m1 stop San Francisco

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

13h 14m1 stop San Francisco

€748United Airlines

Sun, 30 Aug - Tue, 8 Sep

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Alaska Airlines flights from London to Ontario

Our best Alaska Airlines deals on London to Ontario flight tickets

Alaska Airlines

5 Oct

LHR17:00London Heathrow

14h 42m

1 stop

ONT23:42Ontario

18 Oct

ONT11:13Ontario

19h 52m

1 stop

LHR15:05London Heathrow

€507

Alaska Airlines

22 Oct

LHR17:00London Heathrow

14h 42m

1 stop

ONT23:42Ontario

2 Nov

ONT06:00Ontario

22h 20m

1 stop

LHR12:20London Heathrow

€508

Alaska Airlines

25 Oct

LHR14:45London Heathrow

15h 57m

1 stop

ONT23:42Ontario

9 Jan

ONT11:36Ontario

16h 44m

1 stop

LHR12:20London Heathrow

€512

Virgin Atlantic flights from London to Ontario

Our best Virgin Atlantic deals on London to Ontario flight tickets

Virgin Atlantic

18 Oct

LHR18:30London Heathrow

36h 13m

1 stop

ONT22:43Ontario

31 Oct

ONT12:16Ontario

36h 34m

1 stop

LHR07:50London Heathrow

€556

Virgin Atlantic

4 Nov

LHR12:20London Heathrow

18h 23m

1 stop

ONT22:43Ontario

25 Nov

ONT11:57Ontario

14h 43m

1 stop

LHR10:40London Heathrow

€560

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 15/9

08:45-20:01

2 stops19h 16m

Ontario

Mon 30/11

05:00-09:40

1 stop20h 40m

€440

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 13/10

07:25-17:41

2 stops18h 16m

Ontario

Sun 25/10

06:00-08:25

2 stops19h 25m

€445

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 15/9

07:25-20:01

2 stops20h 36m

Ontario

Mon 30/11

13:35-07:25

1 stop33h 50m

€445

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 26/10

09:30-20:15

2 stops17h 45m

Ontario

Fri 8/1

13:00-09:40

1 stop12h 40m

€446

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

07:30-20:20

3 stops20h 50m

Ontario

Mon 25/1

06:00-09:40

2 stops19h 40m

€453

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 24/10

14:50-20:58

1 stop14h 08m

Ontario

Sat 31/10

13:29-09:40

1 stop13h 11m

€473

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 16/9

14:50-20:53

1 stop14h 03m

Ontario

Wed 30/9

13:24-09:40

1 stop12h 16m

€474

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 10/9

14:50-20:53

1 stop14h 03m

Ontario

Wed 23/9

13:18-09:40

1 stop12h 22m

€475

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 22/10

11:45-17:12

2 stops37h 27m

Ontario

Sun 1/11

06:00-07:05

2 stops17h 05m

€476

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 12/10

06:30-17:12

2 stops18h 42m

Ontario

Mon 9/11

13:15-10:00

1 stop12h 45m

€477

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 €480 to €631.
The lowest price recently found on this route was €440.

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 €512.

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

Best price found	€409
Fastest flight time	17h 10m
Direct flights	None

The best one-way flight to Ontario from London in the past 72 hours is €409. The best return flight deal from London to Ontario found on momondo in the last 72 hours is €440.

The fastest flight from London to Ontario takes 17h 10m

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 17h 10m 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.