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

Flights via Seattle (SEA) offer the lowest average return price of £360.

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

Phoenix (PHX) was the most common stop: 50% of momondo users choosing one-stop flights on this route connected there.

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, United Airlines, and Iberia are the most popular carriers operating from London to Ontario

Which airlines fly to Ontario?

Virgin Atlantic, British Airways and Lufthansa are the top three most popular airlines that fly to Ontario from London according to our data. Virgin Atlantic 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.

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 September 2026, there are 3 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.

£347 Cheap Flights from London to Ontario in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from London 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

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

12h 00m1 stop Denver Intl

£378United Airlines

Tue, 24 Nov - Wed, 9 Dec

08:40 - 17:41LHR London Heathrow-ONT Ontario

41h 01m2 stops Zurich San Francisco

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

21h 40m1 stop Denver Intl

£378United Airlines

Mon, 19 Oct - Mon, 26 Oct

07:25 - 20:31LHR London Heathrow-ONT Ontario

21h 06m2 stops Munich Franz Josef Strauss San Francisco

11:10 - 13:00ONT Ontario-LHR London Heathrow

17h 50m2 stops San Francisco Zurich

£381United Airlines

Wed, 7 Oct - Wed, 14 Oct

11:45 - 22:43LHR London Heathrow-ONT Ontario

42h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

12:20 - 07:50ONT Ontario-LHR London Heathrow

35h 30m1 stop Atlanta Hartsfield-Jackson

£389Virgin Atlantic

Wed, 4 Nov - Fri, 4 Dec

19:15 - 23:55LHR London Heathrow-ONT Ontario

36h 40m2 stops Amsterdam Schiphol Salt Lake City

13:35 - 07:05ONT Ontario-LHR London Heathrow

34h 30m2 stops Salt Lake City Minneapolis St Paul

£389Virgin Atlantic

Wed, 21 Oct - Wed, 28 Oct

15:45 - 22:43LHR London Heathrow-ONT Ontario

38h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

06:00 - 07:05ONT Ontario-LHR London Heathrow

17h 05m2 stops Salt Lake City Minneapolis St Paul

£389Virgin Atlantic

Wed, 4 Nov - Fri, 4 Dec

14:30 - 20:02LHR London Heathrow-ONT Ontario

37h 32m2 stops Vancouver Intl San Francisco

06:00 - 11:50ONT Ontario-LHR London Heathrow

21h 50m2 stops San Francisco Vancouver Intl

£406Air Canada

Tue, 24 Nov - Mon, 7 Dec

14:30 - 20:02LHR London Heathrow-ONT Ontario

37h 32m2 stops Vancouver Intl San Francisco

11:20 - 11:50ONT Ontario-LHR London Heathrow

16h 30m2 stops San Francisco Vancouver Intl

£406Air Canada

Tue, 24 Nov - Wed, 9 Dec

14:35 - 21:59LHR London Heathrow-ONT Ontario

15h 24m1 stop Phoenix Sky Harbor Intl

16:25 - 13:35ONT Ontario-LHR London Heathrow

13h 10m1 stop Phoenix Sky Harbor Intl

£483British Airways

Mon, 11 Jan - Mon, 18 Jan

11:15 - 18:52LHR London Heathrow-ONT Ontario

15h 37m1 stop Dallas/Fort Worth

17:02 - 13:35ONT Ontario-LHR London Heathrow

12h 33m1 stop Phoenix Sky Harbor Intl

£483British Airways

Sat, 20 Feb - Fri, 5 Mar

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

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

16h 55m2 stops Denver Intl Newark

£383Air Canada

Thu, 17 Sep - Wed, 30 Sep

08:30 - 22:51LHR London Heathrow-ONT Ontario

22h 21m2 stops Toronto Pearson Intl San Francisco

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

16h 55m2 stops Denver Intl Newark

£389Air Canada

Thu, 17 Sep - Wed, 30 Sep

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

19h 00m1 stop Seattle/Tacoma Intl

07:05 - 06:25ONT Ontario-LHR London Heathrow

15h 20m1 stop Atlanta Hartsfield-Jackson

£392Virgin Atlantic

Thu, 17 Sep - Wed, 30 Sep

10:55 - 16:35LHR London Heathrow-ONT Ontario

13h 40m1 stop Salt Lake City

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

13h 35m1 stop Seattle/Tacoma Intl

£403Virgin Atlantic

Thu, 17 Sep - Wed, 30 Sep

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

14h 03m1 stop Denver Intl

13:24 - 12:35ONT Ontario-LHR London Heathrow

15h 11m1 stop Denver Intl

£405United Airlines

Thu, 17 Sep - Wed, 30 Sep

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

14h 03m1 stop Denver Intl

13:24 - 12:25ONT Ontario-LHR London Heathrow

15h 01m1 stop Denver Intl

£405United Airlines

Fri, 18 Sep - Thu, 1 Oct

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

£406United Airlines

Wed, 16 Sep - Wed, 23 Sep

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

18h 55m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

13:04 - 10:00ONT Ontario-LHR London Heathrow

12h 56m1 stop Salt Lake City

£408Virgin Atlantic

Wed, 16 Sep - Wed, 23 Sep

09:55 - 22:24LHR London Heathrow-ONT Ontario

20h 29m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson

11:54 - 15:35ONT Ontario-LHR London Heathrow

19h 41m1 stop Seattle/Tacoma Intl

£410Delta

Thu, 17 Sep - Wed, 30 Sep

11:00 - 18:53LHR London Heathrow-ONT Ontario

15h 53m1 stop Dallas/Fort Worth

12:37 - 14:25ONT Ontario-LHR London Heathrow

17h 48m1 stop Dallas/Fort Worth

£11,715British Airways

Tue, 15 Sep - Fri, 18 Sep

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

United Airlines flights from London to Ontario

Our best United Airlines deals on London to Ontario flight tickets

United Airlines

19 Oct

LHR08:40London Heathrow

41h 01m

2 stops

ONT17:41Ontario

26 Oct

ONT05:00Ontario

21h 40m

1 stop

LHR09:40London Heathrow

£378

United Airlines

7 Oct

LHR07:25London Heathrow

21h 06m

2 stops

ONT20:31Ontario

14 Oct

ONT13:52Ontario

13h 18m

1 stop

LHR11:10London Heathrow

£381

United Airlines

6 Oct

LHR07:30London Heathrow

21h 01m

2 stops

ONT20:31Ontario

13 Oct

ONT13:52Ontario

13h 18m

1 stop

LHR11:10London Heathrow

£382

Virgin Atlantic flights from London to Ontario

Our best Virgin Atlantic deals on London to Ontario flight tickets

Virgin Atlantic

4 Nov

LHR11:45London Heathrow

42h 58m

2 stops

ONT22:43Ontario

4 Dec

ONT12:20Ontario

35h 30m

1 stop

LHR07:50London Heathrow

£389

Virgin Atlantic

17 Sept

LHR11:40London Heathrow

19h 00m

1 stop

ONT22:40Ontario

30 Sept

ONT07:05Ontario

15h 20m

1 stop

LHR06:25London Heathrow

£392

Virgin Atlantic

17 Feb

LHR17:05London Heathrow

37h 38m

2 stops

ONT22:43Ontario

27 Feb

ONT12:00Ontario

36h 05m

2 stops

LHR08:05London Heathrow

£395

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 24/11

09:00-20:15

2 stops19h 15m

Ontario

Wed 9/12

13:40-09:40

1 stop12h 00m

£378

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 19/10

08:40-17:41

2 stops41h 01m

Ontario

Mon 26/10

05:00-09:40

1 stop21h 40m

£378

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 7/10

07:25-20:31

2 stops21h 06m

Ontario

Wed 14/10

11:10-13:00

2 stops17h 50m

£381

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 4/11

11:45-22:43

2 stops42h 58m

Ontario

Fri 4/12

12:20-07:50

1 stop35h 30m

£389

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 21/10

19:15-23:55

2 stops36h 40m

Ontario

Wed 28/10

13:35-07:05

2 stops34h 30m

£389

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 4/11

15:45-22:43

2 stops38h 58m

Ontario

Fri 4/12

06:00-07:05

2 stops17h 05m

£389

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 24/11

14:30-20:02

2 stops37h 32m

Ontario

Mon 7/12

06:00-11:50

2 stops21h 50m

£406

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Tue 24/11

14:30-20:02

2 stops37h 32m

Ontario

Wed 9/12

11:20-11:50

2 stops16h 30m

£406

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 11/1

14:35-21:59

1 stop15h 24m

Ontario

Mon 18/1

16:25-13:35

1 stop13h 10m

£483

Fastest return journey

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 20/2

11:15-18:52

1 stop15h 37m

Ontario

Fri 5/3

17:02-13:35

1 stop12h 33m

£483

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 £458 to £555.
The lowest price recently found on this route was £378.

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 £409. 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 £441.

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	£347
Fastest flight time	13h 27m
Direct flights	None

The best one-way flight to Ontario from London in the past 72 hours is £347. The best return flight deal from London to Ontario found on momondo in the last 72 hours is £378.

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

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 27m, 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 September 2026, there are 3 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 42% of all bookings. The subsequent popular airlines are British Airways at 37%, United Airlines at 15%, and Delta at 7%.

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 £367	Free Cancellation	Rating 7.4 10,212 reviews	Search United Airlines flights
Virgin Atlantic	PriceFrom £371	Free Cancellation	Rating 7.4 694 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £385	Free Cancellation	Rating 6.7 8,215 reviews	Search British Airways 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.