Which stopover airport offers the lowest fares from London to Ontario?

Flights via Seattle (SEA) offer the lowest average return price of £363.

Which airlines fly to Ontario?

British Airways, Virgin Atlantic and Lufthansa are the top three most popular airlines that fly to Ontario from London 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 20 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

Which airport is the most popular for stopovers for flights between London and Ontario?

Phoenix (PHX) was the most common stop: 56% of momondo users choosing one-stop flights on this route connected there.

Which stopover airport has the shortest travel time from London to Ontario?

Flights connecting via Phoenix (PHX) have the shortest average one-way travel time: 14h 04m.

Which stopover airport has the shortest connection time from London to Ontario?

Phoenix (PHX) has the shortest average stopover time for this route: 2h 17m.

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

Alaska Airlines is the most popular carrier operating from London to Ontario

When did momondo last update prices for flights from London to Ontario Airport?

Prices for flights from London to Ontario Airport are refreshed on a daily basis.

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

As of October 2026, there are 4 operators available to choose from for flights from London to Ontario Airport.

How old do you have to be to fly from London to Ontario Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London 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.

£288 Cheap Flights from London to Ontario in 2026/27

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Find the cheapest flights from London 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 - 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

£413Alaska Airlines

Wed, 11 Nov - Tue, 17 Nov

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

35h 32m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

£414Alaska Airlines

Thu, 12 Nov - Thu, 26 Nov

20:25 - 22:43LHR London Heathrow-ONT Ontario

34h 18m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

12:00 - 09:00ONT Ontario-LHR London Heathrow

13h 00m1 stop Atlanta Hartsfield-Jackson

£496Virgin Atlantic

Wed, 17 Feb - Thu, 25 Feb

17:50 - 22:48LHR London Heathrow-ONT Ontario

36h 58m2 stops Amsterdam Schiphol Salt Lake City

13:00 - 10:00ONT Ontario-LHR London Heathrow

13h 00m1 stop Salt Lake City

£497Virgin Atlantic

Fri, 26 Feb - Mon, 1 Mar

15:15 - 11:27LHR London Heathrow-ONT Ontario

28h 12m1 stop Atlanta Hartsfield-Jackson

22:59 - 11:20ONT Ontario-LHR London Heathrow

28h 21m1 stop Atlanta Hartsfield-Jackson

£509Delta

Thu, 1 Apr - Fri, 30 Apr

06:30 - 22:35LHR London Heathrow-ONT Ontario

24h 05m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

17:07 - 20:10ONT Ontario-LHR London Heathrow

19h 03m2 stops Salt Lake City New York John F Kennedy Intl

£515Delta

Wed, 13 Jan - Wed, 20 Jan

09:00 - 09:38LHR London Heathrow-ONT Ontario

32h 38m2 stops Zurich San Francisco

23:52 - 12:00ONT Ontario-LHR London Heathrow

28h 08m1 stop Chicago O'Hare Intl

£596United Airlines

Tue, 15 Dec - Tue, 22 Dec

12:05 - 09:38LHR London Heathrow-ONT Ontario

53h 33m2 stops Zurich San Francisco

23:52 - 05:55ONT Ontario-LHR London Heathrow

22h 03m1 stop Chicago O'Hare Intl

£596United Airlines

Sun, 13 Dec - Sun, 20 Dec

14:25 - 22:15LHR London Heathrow-ONT Ontario

15h 50m1 stop Phoenix Sky Harbor Intl

10:38 - 08:15ONT Ontario-LHR London Heathrow

13h 37m1 stop Dallas/Fort Worth

£619British Airways

Fri, 8 Jan - Fri, 15 Jan

10:15 - 18:42LHR London Heathrow-ONT Ontario

15h 27m1 stop Dallas/Fort Worth

16:25 - 12:45ONT Ontario-LHR London Heathrow

12h 20m1 stop Phoenix Sky Harbor Intl

£625British Airways

Wed, 24 Mar - Thu, 1 Apr

Cheap last-minute flights

Enter your travel dates to find the best prices.

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

35h 32m1 stop Seattle/Tacoma Intl

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

22h 20m1 stop Seattle/Tacoma Intl

£421Alaska Airlines

Thu, 5 Nov - Sun, 8 Nov

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

16h 21m1 stop Seattle/Tacoma Intl

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

36h 04m1 stop Seattle/Tacoma Intl

£422Alaska Airlines

Thu, 5 Nov - Wed, 20 Jan

19:30 - 19:30LHR London Heathrow-ONT Ontario

32h 00m2 stops Kastrup Copenhagen San Francisco

10:35 - 16:00ONT Ontario-LHR London Heathrow

21h 25m3 stops Las Vegas Harry Reid Intl San Francisco Kastrup Copenhagen

£672Multiple Airlines

Wed, 4 Nov - Tue, 17 Nov

06:30 - 22:43LHR London Heathrow-ONT Ontario

24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

13:15 - 10:00ONT Ontario-LHR London Heathrow

12h 45m1 stop Salt Lake City

£707Virgin Atlantic

Wed, 4 Nov - Fri, 13 Nov

20:25 - 22:11LHR London Heathrow-ONT Ontario

33h 46m2 stops Amsterdam Schiphol Salt Lake City

11:57 - 10:40ONT Ontario-LHR London Heathrow

14h 43m1 stop Seattle/Tacoma Intl

£708Virgin Atlantic

Wed, 4 Nov - Wed, 11 Nov

18:40 - 19:30LHR London Heathrow-ONT Ontario

32h 50m2 stops Kastrup Copenhagen San Francisco

12:01 - 18:30ONT Ontario-LHR London Heathrow

22h 29m2 stops San Francisco Kastrup Copenhagen

£716Multiple Airlines

Thu, 5 Nov - Thu, 12 Nov

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

15h 39m1 stop Dallas/Fort Worth

12:42 - 10:00ONT Ontario-LHR London Heathrow

13h 18m1 stop Dallas/Fort Worth

£763British Airways

Sat, 31 Oct - Sat, 7 Nov

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

15h 39m1 stop Dallas/Fort Worth

12:42 - 10:00ONT Ontario-LHR London Heathrow

13h 18m1 stop Dallas/Fort Worth

£775British Airways

Sat, 31 Oct - Sat, 7 Nov

10:05 - 18:01LHR London Heathrow-ONT Ontario

14h 56m1 stop San Francisco

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

12h 11m1 stop Denver Intl

£778United Airlines

Sat, 31 Oct - Mon, 30 Nov

11:35 - 20:15LHR London Heathrow-ONT Ontario

16h 40m2 stops Denver Intl San Francisco

14:00 - 11:15ONT Ontario-LHR London Heathrow

13h 15m1 stop San Francisco

£781United Airlines

Mon, 2 Nov - Wed, 6 Jan

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British Airways flights from London to Ontario

Our best British Airways deals on London to Ontario flight tickets

British Airways

13 Nov

LGW11:45London Gatwick

43h 12m

2 stops

ONT22:57Ontario

6 Mar

ONT23:59Ontario

35h 01m

2 stops

LGW19:00London Gatwick

£661

British Airways

12 Nov

LGW11:45London Gatwick

41h 47m

2 stops

ONT21:32Ontario

4 Mar

ONT23:59Ontario

35h 01m

2 stops

LGW19:00London Gatwick

£796

British Airways

5 Jan

LGW19:40London Gatwick

35h 33m

2 stops

ONT23:13Ontario

12 Jan

ONT07:00Ontario

28h 00m

2 stops

LGW19:00London Gatwick

£914

Alaska Airlines flights from London to Ontario

Our best Alaska Airlines deals on London to Ontario flight tickets

Alaska Airlines

11 Nov

LHR14:45London Heathrow

35h 32m

1 stop

ONT18:17Ontario

17 Nov

ONT12:02Ontario

16h 18m

1 stop

LHR12:20London Heathrow

£413

Alaska Airlines

12 Nov

LHR14:45London Heathrow

35h 32m

1 stop

ONT18:17Ontario

26 Nov

ONT06:00Ontario

22h 20m

1 stop

LHR12:20London Heathrow

£414

Alaska Airlines

13 Jan

LHR14:45London Heathrow

15h 56m

1 stop

ONT22:41Ontario

19 Jan

ONT07:00Ontario

21h 20m

1 stop

LHR12:20London Heathrow

£416

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 11/11

14:45-18:17

1 stop35h 32m

Ontario

Tue 17/11

12:02-12:20

1 stop16h 18m

£413

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 12/11

14:45-18:17

1 stop35h 32m

Ontario

Thu 26/11

06:00-12:20

1 stop22h 20m

£414

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 17/2

20:25-22:43

2 stops34h 18m

Ontario

Thu 25/2

12:00-09:00

1 stop13h 00m

£496

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 26/2

17:50-22:48

2 stops36h 58m

Ontario

Mon 1/3

13:00-10:00

1 stop13h 00m

£497

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 1/4

15:15-11:27

1 stop28h 12m

Ontario

Fri 30/4

22:59-11:20

1 stop28h 21m

£509

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 13/1

06:30-22:35

2 stops24h 05m

Ontario

Wed 20/1

17:07-20:10

2 stops19h 03m

£515

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 15/12

09:00-09:38

2 stops32h 38m

Ontario

Tue 22/12

23:52-12:00

1 stop28h 08m

£596

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sun 13/12

12:05-09:38

2 stops53h 33m

Ontario

Sun 20/12

23:52-05:55

1 stop22h 03m

£596

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 8/1

14:25-22:15

1 stop15h 50m

Ontario

Fri 15/1

10:38-08:15

1 stop13h 37m

£619

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 24/3

10:15-18:42

1 stop15h 27m

Ontario

Thu 1/4

16:25-12:45

1 stop12h 20m

£625

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 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

Stopovers

What is the typical price of a round-trip flight between London and Ontario?

Prices are currently low for flights on this route.

Typical prices usually range from £502 to £613.
The lowest price recently found on this route was £413.

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, with most prices found around £413. If you’re not able to fly to Ontario in January, then February is your next best option. Flight prices from London to Ontario during February average around £423.

Can stopping save me money on London to Ontario flights?

You could potentially save up to 47% on your flight if you consider stops on a London to Ontario flight.

When to book flights from London to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from London to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap London to Ontario (LON to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Ontario

Best price found	£288
Fastest flight time	13h 30m
Direct flights	None

The best one-way flight to Ontario from London in the past 72 hours is £288. The best return flight deal from London to Ontario found on momondo in the last 72 hours is £413.

The fastest flight from London to Ontario takes 13h 30m

There are no direct flights from London to Ontario. There are no popular flight routes from London to Ontario.

Search flight deals

Frequently asked questions about flying from London to Ontario

How far is London to Ontario by plane?
There are 5417.5 mi between London and Ontario. Flights usually cover this in 13h 30m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London to Ontario Airport?
Prices for flights from London to Ontario Airport are refreshed on a daily basis.
How many operators does momondo search for flights from London to Ontario Airport?
As of October 2026, there are 4 operators available to choose from for flights from London to Ontario Airport.
How old do you have to be to fly from London to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London 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 to Ontario?
momondo data reveals that the most frequently booked airline on the route from London to Ontario is Virgin Atlantic, representing 38% of all bookings. The subsequent popular airlines are British Airways at 30%, United Airlines at 18%, and Delta at 8%.

Best airlines flying from London to Ontario

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

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom £373	Free Cancellation	Rating 7.3 10,462 reviews	Search United Airlines flights
Virgin Atlantic	PriceFrom £374	Free Cancellation	Rating 7.5 699 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £406	Free Cancellation	Rating 6.7 8,277 reviews	Search British Airways flights
Alaska Airlines	PriceFrom £423	Free Cancellation	Rating 7.9 13,138 reviews	Search Alaska Airlines flights

Why use momondo?

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

Finding the right flight to Ontario from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to Ontario from London with this policy.

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

momondo provides multiple filters to help you find the best flight to Ontario from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are not ready to book a flight from London to Ontario now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ontario and let you know when they change.