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

United Airlines, Avianca, and Alaska Airlines are the most popular carriers 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.

€422 Cheap Flights from London Heathrow Airport to Ontario in 2026/27

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.

14:45 - 23:06LHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

12:02 - 12:20ONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

€501Alaska Airlines

Mon, 2 Nov - Tue, 17 Nov

14:45 - 23:06LHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

12:02 - 12:20ONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

€509Alaska Airlines

Thu, 5 Nov - Tue, 10 Nov

14:45 - 23:06LHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

11:57 - 12:20ONT Ontario-LHR London Heathrow

16h 23m1 stop Seattle/Tacoma Intl

€511Alaska Airlines

Thu, 19 Nov - Thu, 3 Dec

14:45 - 23:06LHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

11:57 - 12:20ONT Ontario-LHR London Heathrow

16h 23m1 stop Seattle/Tacoma Intl

€511Alaska Airlines

Thu, 19 Nov - Thu, 3 Dec

14:45 - 23:06LHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

11:57 - 12:20ONT Ontario-LHR London Heathrow

16h 23m1 stop Seattle/Tacoma Intl

€512Alaska Airlines

Thu, 19 Nov - Thu, 3 Dec

14:45 - 22:41LHR London Heathrow-ONT Ontario

15h 56m1 stop Seattle/Tacoma Intl

11:36 - 12:20ONT Ontario-LHR London Heathrow

16h 44m1 stop Seattle/Tacoma Intl

€513Alaska Airlines

Thu, 21 Jan - Mon, 25 Jan

14:45 - 22:41LHR London Heathrow-ONT Ontario

15h 56m1 stop Seattle/Tacoma Intl

11:36 - 12:20ONT Ontario-LHR London Heathrow

16h 44m1 stop Seattle/Tacoma Intl

€514Alaska Airlines

Thu, 21 Jan - Mon, 25 Jan

14:45 - 22:59LHR London Heathrow-ONT Ontario

16h 14m1 stop Seattle/Tacoma Intl

11:36 - 12:20ONT Ontario-LHR London Heathrow

16h 44m1 stop Seattle/Tacoma Intl

€515Alaska Airlines

Fri, 11 Dec - Wed, 6 Jan

14:45 - 22:41LHR London Heathrow-ONT Ontario

15h 56m1 stop Seattle/Tacoma Intl

11:36 - 12:20ONT Ontario-LHR London Heathrow

16h 44m1 stop Seattle/Tacoma Intl

€516Alaska Airlines

Thu, 21 Jan - Mon, 25 Jan

14:45 - 23:06LHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

06:00 - 12:20ONT Ontario-LHR London Heathrow

22h 20m1 stop Seattle/Tacoma Intl

€517Alaska Airlines

Mon, 16 Nov - Fri, 27 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

14:45 - 10:17LHR London Heathrow-ONT Ontario

26h 32m1 stop Seattle/Tacoma Intl

06:00 - 12:20ONT Ontario-LHR London Heathrow

22h 20m1 stop Seattle/Tacoma Intl

€524Alaska Airlines

Wed, 28 Oct - Mon, 16 Nov

14:45 - 10:17LHR London Heathrow-ONT Ontario

26h 32m1 stop Seattle/Tacoma Intl

12:02 - 12:20ONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

€527Alaska Airlines

Wed, 28 Oct - Sat, 14 Nov

14:45 - 10:17LHR London Heathrow-ONT Ontario

26h 32m1 stop Seattle/Tacoma Intl

12:02 - 12:20ONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

€674Alaska Airlines

Wed, 28 Oct - Thu, 12 Nov

14:45 - 18:00LHR London Heathrow-ONT Ontario

34h 15m1 stop Seattle/Tacoma Intl

20:59 - 12:20ONT Ontario-LHR London Heathrow

31h 21m1 stop Seattle/Tacoma Intl

€739Alaska Airlines

Wed, 28 Oct - Mon, 30 Nov

14:45 - 23:42LHR London Heathrow-ONT Ontario

15h 57m1 stop Seattle/Tacoma Intl

06:00 - 12:20ONT Ontario-LHR London Heathrow

22h 20m1 stop Seattle/Tacoma Intl

€805Alaska Airlines

Mon, 26 Oct - Mon, 2 Nov

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

17h 45m2 stops Frankfurt am Main San Francisco

06:00 - 10:15ONT Ontario-LHR London Heathrow

21h 15m1 stop Houston George Bush Intcntl

€836United Airlines

Tue, 27 Oct - Fri, 30 Oct

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

16h 19m1 stop Houston George Bush Intcntl

13:32 - 09:40ONT Ontario-LHR London Heathrow

13h 08m1 stop Denver Intl

€864United Airlines

Fri, 23 Oct - Thu, 29 Oct

10:35 - 17:36LHR London Heathrow-ONT Ontario

15h 01m1 stop San Francisco

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

12h 11m1 stop Denver Intl

€865United Airlines

Fri, 23 Oct - Thu, 12 Nov

11:40 - 22:43LHR London Heathrow-ONT Ontario

19h 03m1 stop Seattle/Tacoma Intl

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

12h 45m1 stop Salt Lake City

€871Delta

Sat, 24 Oct - Mon, 9 Nov

11:40 - 22:43LHR London Heathrow-ONT Ontario

19h 03m1 stop Seattle/Tacoma Intl

13:35 - 10:00ONT Ontario-LHR London Heathrow

12h 25m1 stop Salt Lake City

€872Delta

Sat, 24 Oct - Sat, 7 Nov

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Delta flights from London Heathrow Airport to Ontario

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

Delta

10 Feb

LHR14:45London Heathrow

41h 03m

2 stops

ONT23:48Ontario

20 Feb

ONT15:30Ontario

31h 45m

2 stops

LHR07:15London Heathrow

€623

Delta

10 Feb

LHR10:45London Heathrow

13h 27m

1 stop

ONT16:12Ontario

20 Feb

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

€625

Delta

24 Mar

LHR08:55London Heathrow

20h 48m

2 stops

ONT22:43Ontario

11 Apr

ONT07:00Ontario

17h 50m

1 stop

LHR08:50London Heathrow

€628

Virgin Atlantic flights from London Heathrow Airport to Ontario

Our best Virgin Atlantic deals on London Heathrow Airport to Ontario flight tickets

Virgin Atlantic

20 Nov

LHR12:20London Heathrow

18h 40m

1 stop

ONT23:00Ontario

26 Nov

ONT07:05Ontario

19h 35m

2 stops

LHR10:40London Heathrow

€633

Virgin Atlantic

2 Nov

LHR12:20London Heathrow

18h 23m

1 stop

ONT22:43Ontario

10 Nov

ONT07:05Ontario

18h 20m

2 stops

LHR09:25London Heathrow

€874

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

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 2/11

14:45-23:06

1 stop16h 21m

Ontario

Tue 17/11

12:02-12:20

1 stop16h 18m

€501

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 5/11

14:45-23:06

1 stop16h 21m

Ontario

Tue 10/11

12:02-12:20

1 stop16h 18m

€509

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 19/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 3/12

11:57-12:20

1 stop16h 23m

€510

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 19/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 3/12

11:57-12:20

1 stop16h 23m

€511

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 19/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 3/12

11:57-12:20

1 stop16h 23m

€512

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

14:45-22:41

1 stop15h 56m

Ontario

Mon 25/1

11:36-12:20

1 stop16h 44m

€513

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

14:45-22:41

1 stop15h 56m

Ontario

Mon 25/1

11:36-12:20

1 stop16h 44m

€514

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 11/12

14:45-22:59

1 stop16h 14m

Ontario

Wed 6/1

11:36-12:20

1 stop16h 44m

€515

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

14:45-22:41

1 stop15h 56m

Ontario

Mon 25/1

11:36-12:20

1 stop16h 44m

€516

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 16/11

14:45-23:06

1 stop16h 21m

Ontario

Fri 27/11

06:00-12:20

1 stop22h 20m

€517

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 €558 to €613.
The lowest price recently found on this route was €501.

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 €505.

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	€422
Fastest flight time	15h 17m
Direct flights	None

The best one-way flight to Ontario from London Heathrow Airport in the past 72 hours is €422. The best return flight deal from London Heathrow Airport to Ontario found on momondo in the last 72 hours is €501.

The fastest flight from London Heathrow Airport to Ontario takes 15h 17m

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 15h 17m, 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.