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

Alaska Airlines, United Airlines, and Avianca 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.

€424 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

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

16h 23m1 stop Seattle/Tacoma Intl

€511Alaska Airlines

Thu, 19 Nov - Thu, 3 Dec

14:45 - 23:31LHR London Heathrow-ONT Ontario

16h 46m1 stop Seattle/Tacoma Intl

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

16h 23m1 stop Seattle/Tacoma Intl

€512Alaska Airlines

Sat, 21 Nov - Fri, 4 Dec

14:45 - 23:31LHR London Heathrow-ONT Ontario

16h 46m1 stop Seattle/Tacoma Intl

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

16h 23m1 stop Seattle/Tacoma Intl

€513Alaska Airlines

Fri, 20 Nov - Thu, 3 Dec

14:45 - 23:31LHR London Heathrow-ONT Ontario

16h 46m1 stop Seattle/Tacoma Intl

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

16h 23m1 stop Seattle/Tacoma Intl

€516Alaska Airlines

Fri, 20 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

€517Alaska 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

€518Alaska Airlines

Mon, 16 Nov - Fri, 27 Nov

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

€519Alaska Airlines

Fri, 6 Nov - Sun, 15 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

€520Alaska Airlines

Fri, 6 Nov - Thu, 12 Nov

14:45 - 22:39LHR London Heathrow-ONT Ontario

15h 54m1 stop Seattle/Tacoma Intl

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

16h 20m1 stop Seattle/Tacoma Intl

€523Alaska Airlines

Wed, 17 Feb - Thu, 25 Feb

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

15h 56m1 stop Seattle/Tacoma Intl

07:00 - 12:20ONT Ontario-LHR London Heathrow

21h 20m1 stop Seattle/Tacoma Intl

€524Alaska Airlines

Wed, 13 Jan - Wed, 10 Feb

Cheap last-minute flights

Enter your travel dates to find the best prices.

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

34h 15m1 stop Seattle/Tacoma Intl

16:09 - 12:20ONT Ontario-LHR London Heathrow

36h 11m1 stop Seattle/Tacoma Intl

€512Alaska Airlines

Thu, 29 Oct - Wed, 11 Nov

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

15h 57m1 stop Seattle/Tacoma Intl

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

16h 18m1 stop Seattle/Tacoma Intl

€518Alaska Airlines

Thu, 29 Oct - Tue, 10 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

€519Alaska Airlines

Thu, 29 Oct - Thu, 5 Nov

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

€520Alaska Airlines

Sun, 1 Nov - Sun, 15 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 - 23:42LHR London Heathrow-ONT Ontario

15h 57m1 stop Seattle/Tacoma Intl

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

16h 18m1 stop Seattle/Tacoma Intl

€638Alaska Airlines

Fri, 30 Oct - Tue, 10 Nov

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

15h 57m1 stop Seattle/Tacoma Intl

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

16h 18m1 stop Seattle/Tacoma Intl

€645Alaska Airlines

Fri, 30 Oct - Sat, 7 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

€646Alaska Airlines

Fri, 30 Oct - Mon, 2 Nov

14:45 - 13:16LHR London Heathrow-ONT Ontario

29h 31m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€657Alaska Airlines

Fri, 30 Oct - Sun, 22 Nov

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

15h 57m1 stop Seattle/Tacoma Intl

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

16h 23m1 stop Seattle/Tacoma Intl

€667Alaska Airlines

Thu, 29 Oct - Thu, 10 Dec

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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

19 Nov

LHR06:30London Heathrow

20h 04m

2 stops

ONT18:34Ontario

26 Nov

ONT06:00Ontario

21h 40m

2 stops

LHR11:40London Heathrow

€631

Delta

13 Feb

LHR10:45London Heathrow

20h 03m

1 stop

ONT22:48Ontario

21 Feb

ONT07:00Ontario

15h 25m

1 stop

LHR06:25London Heathrow

€634

Delta

20 Mar

LHR10:45London Heathrow

18h 28m

1 stop

ONT22:13Ontario

6 Apr

ONT13:00Ontario

13h 00m

1 stop

LHR10:00London Heathrow

€639

United Airlines flights from London Heathrow Airport to Ontario

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

United Airlines

9 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

17 Nov

ONT05:00Ontario

20h 40m

1 stop

LHR09:40London Heathrow

€717

United Airlines

9 Nov

LHR09:30London Heathrow

18h 45m

2 stops

ONT20:15Ontario

16 Nov

ONT13:29Ontario

12h 11m

1 stop

LHR09:40London Heathrow

€724

United Airlines

9 Nov

LHR13:45London Heathrow

17h 03m

1 stop

ONT22:48Ontario

11 Dec

ONT13:40Ontario

12h 00m

1 stop

LHR09:40London Heathrow

€752

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

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

Sat 21/11

14:45-23:31

1 stop16h 46m

Ontario

Fri 4/12

11:57-12:20

1 stop16h 23m

€512

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 20/11

14:45-23:31

1 stop16h 46m

Ontario

Thu 3/12

11:57-12:20

1 stop16h 23m

€513

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 20/11

14:45-23:31

1 stop16h 46m

Ontario

Thu 3/12

11:57-12:20

1 stop16h 23m

€516

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

€517

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

€518

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 6/11

14:45-23:06

1 stop16h 21m

Ontario

Sun 15/11

06:00-12:20

1 stop22h 20m

€519

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 6/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 12/11

12:02-12:20

1 stop16h 18m

€520

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 17/2

14:45-22:39

1 stop15h 54m

Ontario

Thu 25/2

12:00-12:20

1 stop16h 20m

€523

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 13/1

14:45-22:41

1 stop15h 56m

Ontario

Wed 10/2

07:00-12:20

1 stop21h 20m

€524

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 €559 to €614.
The lowest price recently found on this route was €511.

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 €506.

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	€424
Fastest flight time	16h 25m
Direct flights	None

The best one-way flight to Ontario from London Heathrow Airport in the past 72 hours is €424. The best return flight deal from London Heathrow Airport to Ontario found on momondo in the last 72 hours is €511.

The fastest flight from London Heathrow Airport to Ontario takes 16h 25m

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 25m, 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.