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.

€427 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 - 22:59LHR London Heathrow-ONT Ontario

16h 14m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€517Alaska Airlines

Thu, 10 Dec - Sat, 23 Jan

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

16h 14m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€519Alaska Airlines

Fri, 4 Dec - Sun, 6 Dec

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

16h 46m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€520Alaska Airlines

Fri, 20 Nov - Sun, 22 Nov

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

16h 46m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€522Alaska Airlines

Mon, 23 Nov - Tue, 1 Dec

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

15h 54m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€522Alaska Airlines

Fri, 26 Feb - Tue, 2 Mar

14:45 - 11:13LHR London Heathrow-ONT Ontario

28h 28m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€524Alaska Airlines

Wed, 2 Dec - Wed, 9 Dec

14:45 - 22:43LHR London Heathrow-ONT Ontario

15h 58m1 stop Seattle/Tacoma Intl

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

16h 20m1 stop Seattle/Tacoma Intl

€525Alaska Airlines

Sat, 23 Jan - Tue, 16 Feb

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

€527Alaska Airlines

Tue, 16 Feb - Thu, 4 Mar

14:45 - 11:13LHR London Heathrow-ONT Ontario

28h 28m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€528Alaska Airlines

Tue, 8 Dec - Sat, 9 Jan

14:45 - 11:13LHR London Heathrow-ONT Ontario

28h 28m1 stop Seattle/Tacoma Intl

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

16h 20m1 stop Seattle/Tacoma Intl

€529Alaska Airlines

Tue, 8 Dec - Tue, 2 Mar

Cheap last-minute flights

Enter your travel dates to find the best prices.

14:45 - 15:13LHR London Heathrow-ONT Ontario

32h 28m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€511Alaska Airlines

Sun, 8 Nov - Sun, 22 Nov

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

16h 21m1 stop Seattle/Tacoma Intl

16:01 - 12:20ONT Ontario-LHR London Heathrow

36h 19m1 stop Seattle/Tacoma Intl

€513Alaska Airlines

Thu, 12 Nov - Wed, 25 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

€517Alaska Airlines

Mon, 9 Nov - Sun, 22 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

€519Alaska Airlines

Thu, 12 Nov - Thu, 26 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

Thu, 12 Nov - Sun, 22 Nov

14:45 - 11:18LHR London Heathrow-ONT Ontario

28h 33m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

€527Alaska Airlines

Tue, 10 Nov - Sun, 22 Nov

14:45 - 18:17LHR London Heathrow-ONT Ontario

35h 32m1 stop Seattle/Tacoma Intl

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

16h 18m1 stop Seattle/Tacoma Intl

€528Alaska Airlines

Tue, 10 Nov - Tue, 17 Nov

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

16h 21m1 stop Seattle/Tacoma Intl

16:00 - 15:05ONT Ontario-LHR London Heathrow

15h 05m1 stop Seattle/Tacoma Intl

€538Alaska Airlines

Thu, 12 Nov - Tue, 13 Apr

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

16h 21m1 stop Seattle/Tacoma Intl

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

17h 20m1 stop Seattle/Tacoma Intl

€644Alaska Airlines

Thu, 12 Nov - Wed, 17 Mar

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

€645Alaska Airlines

Thu, 12 Nov - Wed, 18 Nov

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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

8 Nov

LHR14:45London Heathrow

32h 28m

1 stop

ONT15:13Ontario

22 Nov

ONT06:00Ontario

22h 20m

1 stop

LHR12:20London Heathrow

€511

Alaska Airlines

13 Nov

LHR14:45London Heathrow

35h 32m

1 stop

ONT18:17Ontario

21 Nov

ONT16:01Ontario

36h 19m

1 stop

LHR12:20London Heathrow

€512

Alaska Airlines

12 Nov

LHR14:45London Heathrow

16h 21m

1 stop

ONT23:06Ontario

25 Nov

ONT16:01Ontario

36h 19m

1 stop

LHR12:20London Heathrow

€513

Delta flights from London Heathrow Airport to Ontario

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

Delta

13 Jan

LHR06:30London Heathrow

23h 14m

2 stops

ONT21:44Ontario

20 Jan

ONT07:00Ontario

19h 40m

1 stop

LHR10:40London Heathrow

€631

Delta

25 Feb

LHR10:00London Heathrow

19h 44m

2 stops

ONT21:44Ontario

12 Mar

ONT17:47Ontario

18h 23m

2 stops

LHR20:10London Heathrow

€635

Delta

10 Apr

LHR06:30London Heathrow

24h 18m

2 stops

ONT22:48Ontario

30 Apr

ONT06:00Ontario

23h 05m

2 stops

LHR13:05London Heathrow

€658

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 10/12

14:45-22:59

1 stop16h 14m

Ontario

Sat 23/1

06:00-12:20

1 stop22h 20m

€517

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 4/12

14:45-22:59

1 stop16h 14m

Ontario

Sun 6/12

06:00-12:20

1 stop22h 20m

€519

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 20/11

14:45-23:31

1 stop16h 46m

Ontario

Sun 22/11

06:00-12:20

1 stop22h 20m

€520

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 23/11

14:45-23:31

1 stop16h 46m

Ontario

Tue 1/12

06:00-12:20

1 stop22h 20m

€522

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 26/2

14:45-22:39

1 stop15h 54m

Ontario

Tue 2/3

06:00-12:20

1 stop22h 20m

€522

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 2/12

14:45-11:13

1 stop28h 28m

Ontario

Wed 9/12

06:00-12:20

1 stop22h 20m

€524

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 23/1

14:45-22:43

1 stop15h 58m

Ontario

Tue 16/2

12:00-12:20

1 stop16h 20m

€525

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 16/2

14:45-22:39

1 stop15h 54m

Ontario

Thu 4/3

12:00-12:20

1 stop16h 20m

€527

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 8/12

14:45-11:13

1 stop28h 28m

Ontario

Sat 9/1

06:00-12:20

1 stop22h 20m

€528

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 8/12

14:45-11:13

1 stop28h 28m

Ontario

Tue 2/3

12:00-12:20

1 stop16h 20m

€529

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 €637.
The lowest price recently found on this route was €517.

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	€427
Fastest flight time	28h 26m
Direct flights	None

The best one-way flight to Ontario from London Heathrow Airport in the past 72 hours is €427. The best return flight deal from London Heathrow Airport to Ontario found on momondo in the last 72 hours is €517.

The fastest flight from London Heathrow Airport to Ontario takes 28h 26m

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 28h 26m, 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.