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

Alaska Airlines and United 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.

€417 Cheap Flights from London Heathrow Airport to Ontario in 2026/27

Find the cheapest flights from London Heathrow Airport to Los Angeles

Return

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

11:55 - 12:20ONT Ontario-LHR London Heathrow

16h 25m1 stop Seattle/Tacoma Intl

€507Alaska Airlines

Thu, 12 Nov - Thu, 26 Nov

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

16h 21m1 stop Seattle/Tacoma Intl

11:55 - 12:20ONT Ontario-LHR London Heathrow

16h 25m1 stop Seattle/Tacoma Intl

€507Alaska Airlines

Thu, 12 Nov - Thu, 26 Nov

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

16h 21m1 stop Seattle/Tacoma Intl

11:55 - 12:20ONT Ontario-LHR London Heathrow

16h 25m1 stop Seattle/Tacoma Intl

€509Alaska Airlines

Thu, 12 Nov - Thu, 26 Nov

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

€511Alaska 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

€512Alaska 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

€514Alaska Airlines

Fri, 13 Nov - Tue, 1 Dec

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

15h 57m1 stop Seattle/Tacoma Intl

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

16h 44m1 stop Seattle/Tacoma Intl

€515Alaska Airlines

Thu, 29 Oct - Sat, 9 Jan

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

15h 56m1 stop Seattle/Tacoma Intl

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

16h 20m1 stop Seattle/Tacoma Intl

€518Alaska Airlines

Tue, 9 Feb - Wed, 17 Feb

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

15h 56m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€519Alaska Airlines

Sat, 30 Jan - Tue, 16 Feb

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

Thu, 12 Nov - Thu, 26 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

17:00 - 10:17LHR London Heathrow-ONT Ontario

25h 17m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€507Alaska Airlines

Mon, 19 Oct - Mon, 2 Nov

17:00 - 23:42LHR London Heathrow-ONT Ontario

14h 42m1 stop Seattle/Tacoma Intl

06:02 - 12:20ONT Ontario-LHR London Heathrow

23h 18m1 stop Seattle/Tacoma Intl

€514Alaska Airlines

Mon, 19 Oct - Sun, 25 Oct

17:00 - 23:42LHR London Heathrow-ONT Ontario

14h 42m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€515Alaska Airlines

Thu, 22 Oct - Tue, 17 Nov

17:00 - 10:17LHR London Heathrow-ONT Ontario

25h 17m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€519Alaska Airlines

Mon, 19 Oct - Mon, 2 Nov

17:00 - 10:17LHR London Heathrow-ONT Ontario

25h 17m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€523Alaska Airlines

Wed, 21 Oct - Wed, 2 Dec

17:00 - 10:17LHR London Heathrow-ONT Ontario

25h 17m1 stop Seattle/Tacoma Intl

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

16h 18m1 stop Seattle/Tacoma Intl

€524Alaska Airlines

Tue, 20 Oct - Fri, 13 Nov

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

21h 00m1 stop Salt Lake City

07:05 - 06:25ONT Ontario-LHR London Heathrow

15h 20m1 stop Atlanta Hartsfield-Jackson

€697Delta

Wed, 21 Oct - Tue, 10 Nov

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

19h 03m1 stop Seattle/Tacoma Intl

07:05 - 06:25ONT Ontario-LHR London Heathrow

15h 20m1 stop Atlanta Hartsfield-Jackson

€723Delta

Wed, 21 Oct - Mon, 9 Nov

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

19h 03m1 stop Seattle/Tacoma Intl

07:05 - 06:25ONT Ontario-LHR London Heathrow

15h 20m1 stop Atlanta Hartsfield-Jackson

€726Delta

Tue, 20 Oct - Tue, 17 Nov

17:00 - 23:42LHR London Heathrow-ONT Ontario

14h 42m1 stop Seattle/Tacoma Intl

14:13 - 12:20ONT Ontario-LHR London Heathrow

15h 07m1 stop Seattle/Tacoma Intl

€796Alaska Airlines

Mon, 19 Oct - Tue, 27 Oct

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

United Airlines flights from London Heathrow Airport to Ontario

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

United Airlines

7 Dec

LHR09:00London Heathrow

19h 38m

2 stops

ONT20:38Ontario

28 Dec

ONT23:52Ontario

22h 03m

1 stop

LHR05:55London Heathrow

€661

United Airlines

29 Oct

LHR09:00London Heathrow

20h 48m

2 stops

ONT22:48Ontario

11 Nov

ONT13:29Ontario

12h 11m

1 stop

LHR09:40London Heathrow

€662

United Airlines

2 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

15 Nov

ONT05:00Ontario

20h 40m

1 stop

LHR09:40London Heathrow

€663

British Airways flights from London Heathrow Airport to Ontario

Our best British Airways deals on London Heathrow Airport to Ontario flight tickets

British Airways

1 Dec

LHR11:45London Heathrow

19h 35m

1 stop

ONT23:20Ontario

8 Dec

ONT07:00Ontario

15h 50m

1 stop

LHR06:50London Heathrow

€695

British Airways

28 Oct

LHR13:50London Heathrow

16h 09m

1 stop

ONT22:59Ontario

12 Dec

ONT16:51Ontario

12h 44m

1 stop

LHR13:35London Heathrow

€717

British Airways

22 Oct

LHR10:05London Heathrow

13h 11m

1 stop

ONT15:16Ontario

13 Dec

ONT16:25Ontario

13h 10m

1 stop

LHR13:35London Heathrow

€880

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 12/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 26/11

11:55-12:20

1 stop16h 25m

€507

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 12/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 26/11

11:55-12:20

1 stop16h 25m

€507

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 12/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 26/11

11:55-12:20

1 stop16h 25m

€509

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

€511

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

€512

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 13/11

14:45-23:06

1 stop16h 21m

Ontario

Tue 1/12

06:00-12:20

1 stop22h 20m

€514

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 29/10

14:45-23:42

1 stop15h 57m

Ontario

Sat 9/1

11:36-12:20

1 stop16h 44m

€515

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 9/2

14:45-22:41

1 stop15h 56m

Ontario

Wed 17/2

12:00-12:20

1 stop16h 20m

€518

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 30/1

14:45-22:41

1 stop15h 56m

Ontario

Tue 16/2

06:00-12:20

1 stop22h 20m

€519

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 12/11

14:45-23:06

1 stop16h 21m

Ontario

Thu 26/11

06:00-12:20

1 stop22h 20m

€520

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 €548 to €580.
The lowest price recently found on this route was €507.

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	€417
Fastest flight time	15h 56m
Direct flights	None

The best one-way flight to Ontario from London Heathrow Airport in the past 72 hours is €417. The best return flight deal from London Heathrow Airport to Ontario found on momondo in the last 72 hours is €507.

The fastest flight from London Heathrow Airport to Ontario takes 15h 56m

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 56m, 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.