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.

€410 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.

09:00 - 20:15LHR London Heathrow-ONT Ontario

19h 15m2 stops Zurich San Francisco

06:00 - 11:15ONT Ontario-LHR London Heathrow

21h 15m1 stop San Francisco

€438United Airlines

Mon, 9 Nov - Mon, 16 Nov

09:00 - 22:48LHR London Heathrow-ONT Ontario

21h 48m2 stops Zurich San Francisco

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

20h 40m1 stop Denver Intl

€443United Airlines

Mon, 16 Nov - Sun, 29 Nov

07:30 - 20:51LHR London Heathrow-ONT Ontario

21h 21m2 stops Frankfurt am Main Denver Intl

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

20h 40m1 stop Denver Intl

€446United Airlines

Sun, 8 Nov - Sun, 15 Nov

07:25 - 22:51LHR London Heathrow-ONT Ontario

23h 26m2 stops Munich Franz Josef Strauss San Francisco

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

16h 55m2 stops Denver Intl Chicago O'Hare Intl

€448United Airlines

Wed, 21 Oct - Mon, 2 Nov

07:30 - 20:51LHR London Heathrow-ONT Ontario

21h 21m2 stops Frankfurt am Main Denver Intl

09:25 - 11:15ONT Ontario-LHR London Heathrow

17h 50m1 stop San Francisco

€449United Airlines

Fri, 6 Nov - Mon, 16 Nov

09:30 - 22:48LHR London Heathrow-ONT Ontario

21h 18m2 stops Frankfurt am Main San Francisco

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

17h 25m1 stop San Francisco

€450United Airlines

Fri, 6 Nov - Fri, 13 Nov

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

18h 45m2 stops Frankfurt am Main San Francisco

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

20h 40m1 stop Denver Intl

€450United Airlines

Thu, 5 Nov - Thu, 12 Nov

09:00 - 20:26LHR London Heathrow-ONT Ontario

19h 26m2 stops Zurich San Francisco

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

12h 40m1 stop Denver Intl

€452United Airlines

Thu, 21 Jan - Mon, 25 Jan

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

20h 50m3 stops Frankfurt am Main Newark Denver Intl

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

17h 25m1 stop San Francisco

€456United Airlines

Thu, 21 Jan - Mon, 25 Jan

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

20h 50m3 stops Frankfurt am Main Newark Denver Intl

16:03 - 07:25ONT Ontario-LHR London Heathrow

31h 22m1 stop San Francisco

€457United Airlines

Thu, 21 Jan - Mon, 25 Jan

Cheap last-minute flights

Enter your travel dates to find the best prices.

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

16h 19m1 stop Houston George Bush Intcntl

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

13h 18m1 stop San Francisco

€472United Airlines

Fri, 2 Oct - Fri, 9 Oct

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

€473United Airlines

Thu, 1 Oct - Wed, 14 Oct

11:25 - 20:58LHR London Heathrow-ONT Ontario

17h 33m1 stop Denver Intl

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

12h 16m1 stop Denver Intl

€474United Airlines

Fri, 2 Oct - Thu, 15 Oct

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

€476United Airlines

Thu, 1 Oct - Wed, 14 Oct

14:10 - 22:49LHR London Heathrow-ONT Ontario

16h 39m1 stop Chicago O'Hare Intl

13:22 - 09:40ONT Ontario-LHR London Heathrow

12h 18m1 stop Denver Intl

€477United Airlines

Thu, 1 Oct - Tue, 6 Oct

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

€478United Airlines

Thu, 1 Oct - Wed, 14 Oct

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

14h 08m1 stop Denver Intl

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

12h 16m1 stop Denver Intl

€479United Airlines

Mon, 28 Sep - Sun, 11 Oct

08:40 - 22:40LHR London Heathrow-ONT Ontario

22h 00m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

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

21h 00m1 stop Seattle/Tacoma Intl

€482Delta

Mon, 28 Sep - Tue, 13 Oct

08:00 - 22:49LHR London Heathrow-ONT Ontario

22h 49m1 stop Chicago O'Hare Intl

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

13h 18m1 stop San Francisco

€485United Airlines

Mon, 28 Sep - Tue, 13 Oct

17:45 - 22:40LHR London Heathrow-ONT Ontario

36h 55m1 stop Seattle/Tacoma Intl

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

13h 35m1 stop Seattle/Tacoma Intl

€493Virgin Atlantic

Fri, 2 Oct - Thu, 15 Oct

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Alaska Airlines flights from London Heathrow Airport to Ontario

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

Alaska Airlines

15 Oct

LHR17:00London Heathrow

14h 42m

1 stop

ONT23:42Ontario

12 Jan

ONT11:36Ontario

16h 44m

1 stop

LHR12:20London Heathrow

€507

Alaska Airlines

25 Nov

LHR14:45London Heathrow

16h 46m

1 stop

ONT23:31Ontario

6 Dec

ONT06:00Ontario

22h 20m

1 stop

LHR12:20London Heathrow

€510

Alaska Airlines

25 Nov

LHR14:45London Heathrow

16h 46m

1 stop

ONT23:31Ontario

4 Dec

ONT06:00Ontario

22h 20m

1 stop

LHR12:20London Heathrow

€511

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

16 Nov

ONT18:37Ontario

18h 43m

2 stops

LHR21:20London Heathrow

€438

United Airlines

16 Nov

LHR09:00London Heathrow

21h 48m

2 stops

ONT22:48Ontario

29 Nov

ONT05:00Ontario

20h 40m

1 stop

LHR09:40London Heathrow

€442

United Airlines

8 Nov

LHR07:30London Heathrow

21h 21m

2 stops

ONT20:51Ontario

15 Nov

ONT05:00Ontario

20h 40m

1 stop

LHR09:40London Heathrow

€446

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 9/11

09:00-20:15

2 stops19h 15m

Ontario

Mon 16/11

06:00-11:15

1 stop21h 15m

€438

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 16/11

09:00-22:48

2 stops21h 48m

Ontario

Sun 29/11

05:00-09:40

1 stop20h 40m

€442

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sun 8/11

07:30-20:51

2 stops21h 21m

Ontario

Sun 15/11

05:00-09:40

1 stop20h 40m

€446

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 21/10

07:25-22:51

2 stops23h 26m

Ontario

Mon 2/11

05:00-05:55

2 stops16h 55m

€448

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 6/11

07:30-20:51

2 stops21h 21m

Ontario

Mon 16/11

09:25-11:15

1 stop17h 50m

€449

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 6/11

09:30-22:48

2 stops21h 18m

Ontario

Fri 13/11

06:00-07:25

1 stop17h 25m

€450

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 5/11

09:30-20:15

2 stops18h 45m

Ontario

Thu 12/11

05:00-09:40

1 stop20h 40m

€450

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

09:00-20:26

2 stops19h 26m

Ontario

Mon 25/1

13:00-09:40

1 stop12h 40m

€452

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

07:30-20:20

3 stops20h 50m

Ontario

Mon 25/1

06:00-07:25

1 stop17h 25m

€456

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 21/1

07:30-20:20

3 stops20h 50m

Ontario

Mon 25/1

16:03-07:25

1 stop31h 22m

€457

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 €540 to €580.
The lowest price recently found on this route was €438.

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 €498.

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	€410
Fastest flight time	14h 24m
Direct flights	None

The best one-way flight to Ontario from London Heathrow Airport in the past 72 hours is €410. The best return flight deal from London Heathrow Airport to Ontario found on momondo in the last 72 hours is €438.

The fastest flight from London Heathrow Airport to Ontario takes 14h 24m

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 14h 24m, 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.