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

Alaska Airlines is the most popular carrier operating from London Heathrow to Ontario

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

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

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

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

The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

€406 Cheap Flights from London Heathrow Airport to Ontario in 2026

Find the cheapest flights from London Heathrow Airport to Los Angeles

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One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

08:40 - 17:41LHR London Heathrow-ONT Ontario

41h 01m2 stops Zurich San Francisco

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

21h 40m1 stop Denver Intl

€439United Airlines

Mon, 19 Oct - Mon, 26 Oct

06:55 - 10:23LHR London Heathrow-ONT Ontario

35h 28m2 stops Munich Franz Josef Strauss San Francisco

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

15h 00m1 stop San Francisco

€443United Airlines

Mon, 19 Oct - Mon, 26 Oct

07:25 - 20:31LHR London Heathrow-ONT Ontario

21h 06m2 stops Munich Franz Josef Strauss San Francisco

13:52 - 11:10ONT Ontario-LHR London Heathrow

13h 18m1 stop San Francisco

€443United Airlines

Wed, 7 Oct - Wed, 14 Oct

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

17h 45m2 stops Frankfurt am Main San Francisco

13:35 - 11:15ONT Ontario-LHR London Heathrow

13h 40m1 stop San Francisco

€444United Airlines

Tue, 27 Oct - Mon, 2 Nov

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

21h 01m2 stops Frankfurt am Main San Francisco

13:35 - 07:40ONT Ontario-LHR London Heathrow

34h 05m2 stops San Francisco Houston George Bush Intcntl

€464United Airlines

Thu, 22 Oct - Sun, 1 Nov

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

€472United Airlines

Tue, 22 Sep - Mon, 28 Sep

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

16h 19m1 stop Houston George Bush Intcntl

07:00 - 05:55ONT Ontario-LHR London Heathrow

14h 55m1 stop Chicago O'Hare Intl

€473United Airlines

Sun, 11 Oct - Wed, 2 Dec

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

14h 08m1 stop Denver Intl

13:24 - 12:35ONT Ontario-LHR London Heathrow

15h 11m1 stop Denver Intl

€474United Airlines

Sat, 26 Sep - Wed, 30 Sep

11:45 - 22:43LHR London Heathrow-ONT Ontario

18h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

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

20h 00m2 stops Salt Lake City Atlanta Hartsfield-Jackson

€476Delta

Mon, 19 Oct - Mon, 26 Oct

10:25 - 18:44LHR London Heathrow-ONT Ontario

16h 19m1 stop Chicago O'Hare Intl

06:00 - 07:25ONT Ontario-LHR London Heathrow

17h 25m1 stop San Francisco

€480United Airlines

Thu, 21 Jan - Mon, 25 Jan

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 - 09:40ONT Ontario-LHR London Heathrow

12h 22m1 stop Denver Intl

€472United Airlines

Mon, 14 Sep - Mon, 21 Sep

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

€473United Airlines

Mon, 14 Sep - Sun, 27 Sep

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

Mon, 14 Sep - Sun, 27 Sep

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

€480United Airlines

Mon, 14 Sep - Sun, 27 Sep

17:00 - 11:16LHR London Heathrow-ONT Ontario

26h 16m1 stop Seattle/Tacoma Intl

12:00 - 12:20ONT Ontario-LHR London Heathrow

16h 20m1 stop Seattle/Tacoma Intl

€514Alaska Airlines

Wed, 16 Sep - Tue, 15 Dec

17:00 - 11:16LHR London Heathrow-ONT Ontario

26h 16m1 stop Seattle/Tacoma Intl

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

15h 51m1 stop Seattle/Tacoma Intl

€657Alaska Airlines

Tue, 15 Sep - Mon, 28 Sep

17:00 - 23:24LHR London Heathrow-ONT Ontario

14h 24m1 stop Seattle/Tacoma Intl

06:02 - 15:05ONT Ontario-LHR London Heathrow

25h 03m1 stop Seattle/Tacoma Intl

€664Alaska Airlines

Fri, 11 Sep - Sun, 20 Sep

17:45 - 16:35LHR London Heathrow-ONT Ontario

30h 50m2 stops Seattle/Tacoma Intl Salt Lake City

06:00 - 11:20ONT Ontario-LHR London Heathrow

21h 20m1 stop Seattle/Tacoma Intl

€675Virgin Atlantic

Mon, 14 Sep - Sun, 27 Sep

17:00 - 23:24LHR London Heathrow-ONT Ontario

14h 24m1 stop Seattle/Tacoma Intl

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

15h 51m1 stop Seattle/Tacoma Intl

€709Alaska Airlines

Mon, 14 Sep - Sat, 26 Sep

17:00 - 23:24LHR London Heathrow-ONT Ontario

14h 24m1 stop Seattle/Tacoma Intl

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

15h 51m1 stop Seattle/Tacoma Intl

€714Alaska Airlines

Fri, 11 Sep - Sat, 19 Sep

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United Airlines flights from London Heathrow Airport to Ontario

Our best United Airlines deals on London Heathrow Airport to Ontario flight tickets

United Airlines

19 Oct

LHR08:40London Heathrow

41h 01m

2 stops

ONT17:41Ontario

26 Oct

ONT05:00Ontario

21h 40m

1 stop

LHR09:40London Heathrow

€439

United Airlines

19 Oct

LHR06:55London Heathrow

35h 28m

2 stops

ONT10:23Ontario

26 Oct

ONT09:25Ontario

15h 00m

1 stop

LHR07:25London Heathrow

€443

United Airlines

7 Oct

LHR07:25London Heathrow

21h 06m

2 stops

ONT20:31Ontario

14 Oct

ONT13:52Ontario

13h 18m

1 stop

LHR11:10London Heathrow

€443

Delta flights from London Heathrow Airport to Ontario

Our best Delta deals on London Heathrow Airport to Ontario flight tickets

Delta

19 Oct

LHR11:45London Heathrow

18h 58m

2 stops

ONT22:43Ontario

26 Oct

ONT06:00Ontario

20h 00m

2 stops

LHR09:00London Heathrow

€476

Delta

31 Dec

LHR10:45London Heathrow

19h 14m

1 stop

ONT21:59Ontario

11 Feb

ONT07:00Ontario

16h 50m

1 stop

LHR07:50London Heathrow

€492

Delta

6 Jan

LHR12:20London Heathrow

18h 23m

1 stop

ONT22:43Ontario

8 Feb

ONT12:00Ontario

13h 00m

1 stop

LHR09:00London Heathrow

€499

momondo Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 19/10

08:40-17:41

2 stops41h 01m

Ontario

Mon 26/10

05:00-09:40

1 stop21h 40m

€439

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 19/10

06:55-10:23

2 stops35h 28m

Ontario

Mon 26/10

09:25-07:25

1 stop15h 00m

€443

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 7/10

07:25-20:31

2 stops21h 06m

Ontario

Wed 14/10

13:52-11:10

1 stop13h 18m

€443

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 27/10

09:30-20:15

2 stops17h 45m

Ontario

Mon 2/11

13:35-11:15

1 stop13h 40m

€444

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 22/10

07:30-20:31

2 stops21h 01m

Ontario

Sun 1/11

13:35-07:40

2 stops34h 05m

€464

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 22/9

14:50-20:53

1 stop14h 03m

Ontario

Mon 28/9

13:24-09:40

1 stop12h 16m

€472

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sun 11/10

13:40-21:59

1 stop16h 19m

Ontario

Wed 2/12

07:00-05:55

1 stop14h 55m

€473

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 26/9

14:50-20:58

1 stop14h 08m

Ontario

Wed 30/9

13:24-12:35

1 stop15h 11m

€474

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 19/10

11:45-22:43

2 stops18h 58m

Ontario

Mon 26/10

06:00-09:00

2 stops20h 00m

€476

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

10:25-18:44

1 stop16h 19m

Ontario

Mon 25/1

06:00-07:25

1 stop17h 25m

€480

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 Heathrow Airport 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 Heathrow Airport and Ontario?

Prices are currently low for flights on this route.

Typical prices usually range from €555 to €668.
The lowest price recently found on this route was €439.

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 Heathrow Airport, when ticket prices are also cheap, with an average price of €487.

When to book flights from London Heathrow Airport to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap London Heathrow Airport to Ontario (LHR to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Ontario

Best price found	€406
Fastest flight time	16h 10m
Direct flights	None

The best one-way flight to Ontario from London Heathrow Airport in the past 72 hours is €406. The best return flight deal from London Heathrow Airport to Ontario found on momondo in the last 72 hours is €439.

The fastest flight from London Heathrow Airport to Ontario takes 16h 10m

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

Search flight deals

Frequently asked questions about flying from London Heathrow Airport to Ontario

How far is London Heathrow to Ontario by plane?
There are 8703.4 km between London Heathrow and Ontario. Flights usually cover this in 16h 10m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London Heathrow Airport to Ontario Airport?
Prices for flights from London Heathrow Airport to Ontario Airport are refreshed on a daily basis.
How old do you have to be to fly from London Heathrow Airport 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 Heathrow Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's licence and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Ontario for you.

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

momondo does allow users to show only those flights to Ontario from London which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from London to Ontario?

momondo helps you find the best flight between London and Ontario by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes momondo offers price alerts on flights to Ontario from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.