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.

€410 Cheap Flights from London Heathrow Airport to Ontario in 2026

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.

08:45 - 20:01LHR London Heathrow-ONT Ontario

19h 16m2 stops Zurich San Francisco

09:01 - 07:25ONT Ontario-LHR London Heathrow

14h 24m1 stop San Francisco

€503United Airlines

Thu, 10 Sep - Thu, 17 Sep

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

19h 15m2 stops Zurich San Francisco

13:29 - 20:35ONT Ontario-LHR London Heathrow

23h 06m2 stops Denver Intl Newark

€504United Airlines

Wed, 18 Nov - Thu, 19 Nov

08:40 - 22:59LHR London Heathrow-ONT Ontario

22h 19m2 stops Zurich San Francisco

13:18 - 09:40ONT Ontario-LHR London Heathrow

12h 22m1 stop Denver Intl

€505United Airlines

Fri, 4 Sep - Thu, 17 Sep

09:00 - 23:06LHR London Heathrow-ONT Ontario

22h 06m2 stops Zurich San Francisco

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

20h 40m1 stop Denver Intl

€508United Airlines

Wed, 2 Dec - Sun, 6 Dec

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

19h 15m2 stops Zurich San Francisco

13:29 - 07:40ONT Ontario-LHR London Heathrow

58h 11m2 stops Denver Intl Houston George Bush Intcntl

€509United Airlines

Wed, 18 Nov - Thu, 19 Nov

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

19h 15m2 stops Zurich San Francisco

13:29 - 07:40ONT Ontario-LHR London Heathrow

58h 11m2 stops Denver Intl Houston George Bush Intcntl

€511United Airlines

Wed, 18 Nov - Thu, 19 Nov

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

19h 15m2 stops Zurich San Francisco

06:00 - 07:40ONT Ontario-LHR London Heathrow

17h 40m1 stop Houston George Bush Intcntl

€513United Airlines

Wed, 18 Nov - Thu, 19 Nov

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

21h 01m2 stops Frankfurt am Main San Francisco

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

20h 40m1 stop Denver Intl

€517United Airlines

Thu, 24 Sep - Wed, 30 Sep

08:40 - 20:01LHR London Heathrow-ONT Ontario

19h 21m2 stops Zurich San Francisco

19:13 - 14:10ONT Ontario-LHR London Heathrow

34h 57m1 stop San Francisco

€518United Airlines

Fri, 11 Sep - Fri, 18 Sep

07:25 - 18:11LHR London Heathrow-ONT Ontario

18h 46m2 stops Munich Franz Josef Strauss San Francisco

13:18 - 09:40ONT Ontario-LHR London Heathrow

12h 22m1 stop Denver Intl

€519United Airlines

Thu, 3 Sep - Sun, 13 Sep

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

€679United Airlines

Fri, 21 Aug - Wed, 23 Sep

13:00 - 20:01LHR London Heathrow-ONT Ontario

15h 01m1 stop San Francisco

13:18 - 09:40ONT Ontario-LHR London Heathrow

12h 22m1 stop Denver Intl

€686United Airlines

Wed, 19 Aug - Mon, 7 Sep

11:40 - 22:45LHR London Heathrow-ONT Ontario

19h 05m1 stop Seattle/Tacoma Intl

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

13h 35m1 stop Seattle/Tacoma Intl

€687Delta

Tue, 18 Aug - Fri, 18 Sep

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

€689United Airlines

Wed, 19 Aug - Sat, 29 Aug

14:50 - 20:53LHR London Heathrow-ONT Ontario

14h 03m1 stop Denver Intl

08:50 - 07:25ONT Ontario-LHR London Heathrow

14h 35m1 stop San Francisco

€690United Airlines

Fri, 21 Aug - Sun, 23 Aug

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

€692United Airlines

Sat, 22 Aug - Sat, 29 Aug

11:40 - 22:45LHR London Heathrow-ONT Ontario

19h 05m1 stop Seattle/Tacoma Intl

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

13h 35m1 stop Seattle/Tacoma Intl

€705Delta

Tue, 18 Aug - Sun, 20 Sep

13:00 - 20:01LHR London Heathrow-ONT Ontario

15h 01m1 stop San Francisco

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

12h 11m1 stop Denver Intl

€710United Airlines

Thu, 20 Aug - Sun, 8 Nov

14:10 - 22:35LHR London Heathrow-ONT Ontario

16h 25m1 stop Chicago O'Hare Intl

13:18 - 09:40ONT Ontario-LHR London Heathrow

12h 22m1 stop Denver Intl

€710United Airlines

Tue, 18 Aug - Sun, 23 Aug

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

€712United Airlines

Fri, 21 Aug - Sun, 30 Aug

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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

10 Sept

LHR08:45London Heathrow

19h 16m

2 stops

ONT20:01Ontario

17 Sept

ONT09:01Ontario

14h 24m

1 stop

LHR07:25London Heathrow

€503

United Airlines

18 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

19 Nov

ONT13:29Ontario

23h 06m

2 stops

LHR20:35London Heathrow

€504

United Airlines

4 Sept

LHR08:40London Heathrow

22h 19m

2 stops

ONT22:59Ontario

17 Sept

ONT13:18Ontario

12h 22m

1 stop

LHR09:40London Heathrow

€505

Delta flights from London Heathrow Airport to Ontario

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

Delta

29 Sept

LHR11:45London Heathrow

18h 55m

2 stops

ONT22:40Ontario

6 Oct

ONT06:00Ontario

20h 20m

2 stops

LHR10:20London Heathrow

€528

Delta

18 Sept

LHR08:55London Heathrow

21h 45m

2 stops

ONT22:40Ontario

4 Oct

ONT06:00Ontario

17h 10m

2 stops

LHR07:10London Heathrow

€532

Delta

18 Sept

LHR08:55London Heathrow

21h 45m

2 stops

ONT22:40Ontario

4 Oct

ONT06:00Ontario

21h 20m

1 stop

LHR11:20London Heathrow

€533

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 10/9

08:45-20:01

2 stops19h 16m

Ontario

Thu 17/9

09:01-07:25

1 stop14h 24m

€503

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 18/11

09:00-20:15

2 stops19h 15m

Ontario

Thu 19/11

13:29-20:35

2 stops23h 06m

€504

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 4/9

08:40-22:59

2 stops22h 19m

Ontario

Thu 17/9

13:18-09:40

1 stop12h 22m

€505

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 2/12

09:00-23:06

2 stops22h 06m

Ontario

Sun 6/12

05:00-09:40

1 stop20h 40m

€508

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 18/11

09:00-20:15

2 stops19h 15m

Ontario

Thu 19/11

13:29-07:40

2 stops58h 11m

€509

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 18/11

09:00-20:15

2 stops19h 15m

Ontario

Thu 19/11

13:29-07:40

2 stops58h 11m

€511

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 18/11

09:00-20:15

2 stops19h 15m

Ontario

Thu 19/11

06:00-07:40

1 stop17h 40m

€513

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 24/9

07:30-20:31

2 stops21h 01m

Ontario

Wed 30/9

05:00-09:40

1 stop20h 40m

€517

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 11/9

08:40-20:01

2 stops19h 21m

Ontario

Fri 18/9

19:13-14:10

1 stop34h 57m

€518

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 3/9

07:25-18:11

2 stops18h 46m

Ontario

Sun 13/9

13:18-09:40

1 stop12h 22m

€519

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 €611 to €775.
The lowest price recently found on this route was €503.

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 €490.

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

Fastest flight time	17h 25m
Direct flights	None

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