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

Alaska Airlines, Lufthansa, and United Airlines are the most popular carriers operating from London Heathrow to Ontario

Which airlines fly to Ontario?

British Airways, Virgin Atlantic and Lufthansa are the top three most popular airlines that fly to Ontario from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 43% of people opting to fly with this airline when travelling to Ontario. Keep in mind that there are 19 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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 were last updated today.

How many operators does momondo search for flights from London Heathrow Airport to Ontario Airport?

The number of operators available for flights from London Heathrow Airport to Ontario Airport is 4 as of September 2026.

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 travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

£334 Cheap Flights from London Heathrow Airport to Ontario in 2026/27

Discover deals from 900+ travel sites with momondo.

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

18:37 - 21:20ONT Ontario-LHR London Heathrow

18h 43m2 stops San Francisco Newark

£377United Airlines

Mon, 9 Nov - Mon, 16 Nov

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

£377United Airlines

Mon, 9 Nov - Mon, 16 Nov

18:00 - 21:11LHR London Heathrow-ONT Ontario

35h 11m2 stops Toronto Pearson Intl Denver Intl

13:40 - 08:30ONT Ontario-LHR London Heathrow

34h 50m2 stops Denver Intl Toronto Pearson Intl

£391Air Canada

Tue, 1 Dec - Tue, 8 Dec

15:05 - 22:51LHR London Heathrow-ONT Ontario

39h 46m2 stops Vancouver Intl San Francisco

06:07 - 13:20ONT Ontario-LHR London Heathrow

23h 13m2 stops San Francisco Vancouver Intl

£396Air Canada

Wed, 14 Oct - Sun, 18 Oct

06:30 - 23:55LHR London Heathrow-ONT Ontario

25h 25m2 stops Amsterdam Schiphol Salt Lake City

06:20 - 10:40ONT Ontario-LHR London Heathrow

21h 20m1 stop Seattle/Tacoma Intl

£401Virgin Atlantic

Wed, 21 Oct - Sun, 25 Oct

12:20 - 22:43LHR London Heathrow-ONT Ontario

18h 23m1 stop Seattle/Tacoma Intl

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

16h 43m1 stop Atlanta Hartsfield-Jackson

£404Virgin Atlantic

Wed, 4 Nov - Sun, 8 Nov

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

25h 17m1 stop Seattle/Tacoma Intl

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

15h 07m1 stop Seattle/Tacoma Intl

£421Alaska Airlines

Tue, 20 Oct - Tue, 27 Oct

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

£422Alaska Airlines

Tue, 24 Nov - Wed, 9 Dec

14:35 - 22:07LHR London Heathrow-ONT Ontario

14h 32m1 stop Phoenix Sky Harbor Intl

10:31 - 06:50ONT Ontario-LHR London Heathrow

13h 19m1 stop Dallas/Fort Worth

£467British Airways

Tue, 16 Mar - Tue, 23 Mar

10:05 - 18:44LHR London Heathrow-ONT Ontario

15h 39m1 stop Dallas/Fort Worth

16:51 - 13:35ONT Ontario-LHR London Heathrow

12h 44m1 stop Phoenix Sky Harbor Intl

£478British Airways

Sat, 31 Oct - Mon, 9 Nov

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

07:00 - 06:55ONT Ontario-LHR London Heathrow

15h 55m2 stops Chicago O'Hare Intl Washington, D.C. Dulles Intl

£384Air Canada

Sun, 4 Oct - Sat, 17 Oct

08:30 - 20:58LHR London Heathrow-ONT Ontario

20h 28m2 stops Toronto Pearson Intl Denver Intl

06:07 - 11:50ONT Ontario-LHR London Heathrow

21h 43m2 stops San Francisco Calgary

£386Air Canada

Tue, 6 Oct - Thu, 15 Oct

16:20 - 22:43LHR London Heathrow-ONT Ontario

38h 23m2 stops New York John F Kennedy Intl Seattle/Tacoma Intl

11:56 - 20:10ONT Ontario-LHR London Heathrow

24h 14m2 stops Seattle/Tacoma Intl New York John F Kennedy Intl

£392Virgin Atlantic

Tue, 6 Oct - Fri, 16 Oct

18:35 - 22:43LHR London Heathrow-ONT Ontario

36h 08m2 stops New York John F Kennedy Intl Seattle/Tacoma Intl

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

13h 35m1 stop Seattle/Tacoma Intl

£397Virgin Atlantic

Tue, 6 Oct - Fri, 16 Oct

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

£407United Airlines

Sun, 4 Oct - Sat, 17 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

£407United Airlines

Fri, 2 Oct - Thu, 15 Oct

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

14h 42m1 stop Seattle/Tacoma Intl

14:13 - 15:05ONT Ontario-LHR London Heathrow

16h 52m1 stop Seattle/Tacoma Intl

£421Alaska Airlines

Mon, 5 Oct - Fri, 16 Oct

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

25h 17m1 stop Seattle/Tacoma Intl

14:13 - 15:05ONT Ontario-LHR London Heathrow

16h 52m1 stop Seattle/Tacoma Intl

£425Alaska Airlines

Tue, 6 Oct - Tue, 20 Oct

14:45 - 09:29LHR London Heathrow-ONT Ontario

26h 44m1 stop Dallas/Fort Worth

07:00 - 09:25ONT Ontario-LHR London Heathrow

18h 25m1 stop Dallas/Fort Worth

£478British Airways

Fri, 2 Oct - Thu, 15 Oct

16:25 - 23:36LHR London Heathrow-ONT Ontario

15h 11m1 stop Dallas/Fort Worth

12:43 - 09:05ONT Ontario-LHR London Heathrow

36h 22m1 stop Dallas/Fort Worth

£505British Airways

Sun, 4 Oct - Sat, 17 Oct

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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

9 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

16 Nov

ONT06:00Ontario

21h 15m

1 stop

LHR11:15London Heathrow

£377

United Airlines

11 Nov

LHR09:00London Heathrow

19h 15m

2 stops

ONT20:15Ontario

18 Nov

ONT06:00Ontario

18h 25m

2 stops

LHR08:25London Heathrow

£378

United Airlines

27 Oct

LHR09:30London Heathrow

17h 45m

2 stops

ONT20:15Ontario

3 Nov

ONT06:00Ontario

17h 40m

1 stop

LHR07:40London Heathrow

£384

Lufthansa flights from London Heathrow Airport to Ontario

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

Lufthansa

3 Oct

LHR10:35London Heathrow

15h 11m

1 stop

ONT17:46Ontario

16 Oct

ONT05:00Ontario

20h 40m

1 stop

LHR09:40London Heathrow

£420

Lufthansa

4 Oct

LHR13:40London Heathrow

16h 19m

1 stop

ONT21:59Ontario

17 Oct

ONT16:03Ontario

14h 07m

1 stop

LHR14:10London Heathrow

£428

Lufthansa

26 Dec

LHR11:35London Heathrow

17h 25m

1 stop

ONT21:00Ontario

10 Jan

ONT13:00Ontario

12h 40m

1 stop

LHR09:40London Heathrow

£438

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

18:37-21:20

2 stops18h 43m

£377

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

£377

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 1/12

18:00-21:11

2 stops35h 11m

Ontario

Tue 8/12

13:40-08:30

2 stops34h 50m

£391

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 14/10

15:05-22:51

2 stops39h 46m

Ontario

Sun 18/10

06:07-13:20

2 stops23h 13m

£396

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 21/10

06:30-23:55

2 stops25h 25m

Ontario

Sun 25/10

06:20-10:40

1 stop21h 20m

£401

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 4/11

12:20-22:43

1 stop18h 23m

Ontario

Sun 8/11

07:07-07:50

1 stop16h 43m

£404

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 20/10

17:00-10:17

1 stop25h 17m

Ontario

Tue 27/10

14:13-12:20

1 stop15h 07m

£421

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 24/11

14:45-23:31

1 stop16h 46m

Ontario

Wed 9/12

11:57-12:20

1 stop16h 23m

£422

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 16/3

14:35-22:07

1 stop14h 32m

Ontario

Tue 23/3

10:31-06:50

1 stop13h 19m

£467

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 31/10

10:05-18:44

1 stop15h 39m

Ontario

Mon 9/11

16:51-13:35

1 stop12h 44m

£478

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 £465 to £500.
The lowest price recently found on this route was £377.

What is the cheapest month to fly to Ontario?

The month of January is, on average, the cheapest month to fly to Ontario from London Heathrow Airport, with most prices found around £418. If you’re not able to fly to Ontario in January, then February is your next best option. Flight prices from London Heathrow Airport to Ontario during February average around £428.

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	£334
Fastest flight time	13h 27m
Direct flights	None

The best one-way flight to Ontario from London Heathrow Airport in the past 72 hours is £334. The best return flight deal from London Heathrow Airport to Ontario found on momondo in the last 72 hours is £377.

The fastest flight from London Heathrow Airport to Ontario takes 13h 27m

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?
Ontario is 5408.1 mi away from London Heathrow. By plane, this route typically takes 13h 27m.
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 were last updated today.
How many operators does momondo search for flights from London Heathrow Airport to Ontario Airport?
The number of operators available for flights from London Heathrow Airport to Ontario Airport is 4 as of September 2026.
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 travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from London Heathrow Airport to Ontario?
momondo data reveals that the most frequently booked airline on the route from London Heathrow Airport to Ontario is British Airways, representing 44% of all bookings. The subsequent popular airlines are United Airlines at 24%, Virgin Atlantic at 24%, and Alaska Airlines at 8%.

Best airlines flying from London Heathrow Airport to Ontario

Compare and see reviews for airlines that fly from London Heathrow Airport to Ontario with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom £378	Free Cancellation	Rating 7.4 10,264 reviews	Search United Airlines flights
Virgin Atlantic	PriceFrom £379	Free Cancellation	Rating 7.4 694 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £393	Free Cancellation	Rating 6.7 8,241 reviews	Search British Airways flights
Alaska Airlines	PriceFrom £432	Free Cancellation	Rating 7.9 12,995 reviews	Search Alaska Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Ontario?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from London.

Can I find flights from London to Ontario with flexible booking policies on momondo?

Flights from London to Ontario with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Ontario?

Once you have performed a search for London to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from London to Ontario right now. Can momondo alert me if prices change?

Price alerts on flights to Ontario from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.