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Ontario

$359+ Cheap flights from London (LON) to Ontario (ONT)

LON — ONT
Sep 20 — Sep 271
Sun 9/20
Sun 9/27
1 adult, Economy
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Cheap flight deals from London to Ontario

Cheapest flights from London to Ontario

Wed 10/147:15 pm -
2 stops35h 28m
Wed 11/1812:22 pm -
1 stop34h 03m
Deal found 8/17$578
Wed 11/49:00 am -
2 stops19h 15m
Mon 11/91:29 pm -
1 stop12h 11m
Deal found 8/18$584
Wed 11/189:00 am -
2 stops19h 15m
Thu 11/196:00 am -
1 stop17h 40m
Deal found 8/17$587
Thu 10/2912:20 pm -
1 stop17h 23m
Sun 11/17:07 am -
1 stop20h 33m
Deal found 8/17$593
Wed 10/147:15 pm -
2 stops35h 28m
Wed 11/187:00 am -
1 stop15h 25m
Deal found 8/17$595
Tue 9/159:40 am -
2 stops22h 07m
Tue 9/221:04 pm -
2 stops34h 11m
Deal found 8/18$596
Thu 9/35:10 pm -
2 stops37h 35m
Tue 9/86:00 am -
1 stop21h 20m
Deal found 8/19$597
Wed 9/307:25 am -
2 stops21h 06m
Wed 10/77:00 am -
2 stops15h 55m
Deal found 8/16$599
Thu 9/37:25 am -
2 stops18h 46m
Sun 9/131:18 pm -
1 stop12h 22m
Deal found 8/16$600
Mon 11/210:00 am -
2 stops38h 23m
Thu 11/1211:57 am -
1 stop14h 43m
Deal found 8/20$602
Wed 9/1610:55 am -
1 stop13h 40m
Wed 9/231:04 pm -
1 stop12h 56m
Deal found 8/17$605
Tue 11/248:05 pm -
2 stops35h 53m
Wed 1/137:00 am -
2 stops17h 50m
Deal found 8/17$635

Find flight deals from London to Ontario

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$578
(TravelUp)

One-way from

$359
(Kiwi.com)

Popular in

June

Cheapest in

March

Average price

$699
Provider with most accurate pricing for London (LON)-Ontario flight deals.
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Provider most trusted by Cheapflights users for London (LON)-Ontario flights.
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From London (LON) to Ontario
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One-way flight from London (LON) to Ontario
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Highest demand for flights based on searches. 13% potential increase in price ($117 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from London to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 9/14

2:50 pm-8:53 pm

1 stop14h 03m

Ontario

Sun 9/27

1:24 pm-9:40 am

1 stop12h 16m

$633

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Fri 1/15

10:50 am-10:14 pm

1 stop19h 24m

Ontario

Mon 1/18

12:00 pm-9:00 am

1 stop13h 00m

$640

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Mon 9/28

5:00 pm-11:24 pm

1 stop14h 24m

Ontario

Fri 10/9

11:13 am-3:05 pm

1 stop19h 52m

$644

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 9/17

5:00 pm-11:24 pm

1 stop14h 24m

Ontario

Sat 10/3

2:13 pm-3:05 pm

1 stop16h 52m

$649

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 9/16

5:00 pm-11:16 am

1 stop26h 16m

Ontario

Thu 10/8

2:13 pm-3:05 pm

1 stop16h 52m

$651

LondonOntario

LCY London City - ONT Ontario

LCYONT

London City

Mon 9/14

9:20 am-10:40 pm

2 stops45h 20m

Ontario

Mon 10/5

1:04 pm-5:20 pm

2 stops20h 16m

$656

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Sat 9/12

1:40 pm-9:59 pm

1 stop16h 19m

Ontario

Fri 9/18

1:56 pm-11:10 am

1 stop13h 14m

$663

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Thu 9/3

2:50 pm-8:53 pm

1 stop14h 03m

Ontario

Mon 9/7

1:18 pm-12:25 pm

1 stop15h 07m

$664

LondonOntario

LHR London Heathrow - ONT Ontario

LHRONT

London Heathrow

Wed 9/16

5:00 pm-11:16 am

1 stop26h 16m

Ontario

Tue 10/13

2:13 pm-3:05 pm

1 stop16h 52m

$664

LondonOntario

LCY London City - ONT Ontario

LCYONT

London City

Wed 9/9

9:20 am-8:24 pm

2 stops19h 04m

Ontario

Wed 9/16

5:15 pm-4:40 pm

2 stops15h 25m

$665

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 60 resultsSorted by cheapest first
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  • Most accurate provider: When it comes to deals on London-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from London to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from London with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from London to Ontario

What is the cheapest month to book a flight from London to Ontario?

Currently, January is the cheapest month in which you can book a flight from London to Ontario (average of $553). Flying from London to Ontario in June is currently the most expensive (average of $882). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from London to Ontario?

Airfare is below average for this route at the moment.
London to Ontario flights typically cost between $611 and $758 in October.
The cheapest round-trip price found within the last 5 days was $578 on Virgin Atlantic (Oct 14-Nov 18).

Related info for your journey

  • What airport do you fly into for flights to Ontario from London?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly into when you book flights from London to Ontario. 1 airline have flights to Ontario from London on a regular basis. Booking flights from London to Ontario should not be difficult; the airport handles an average of 0 inbound flights from London per day.

  • How long is the flight from London to Ontario?

    Airlines like United Airlines, Delta, and Alaska Airlines fly from London to Ontario in about 14h 03m. The time it takes to get you to your destination can typically vary by up to 5h 21m. London and Ontario are separated by a distance of 5407 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from London to Ontario round-trip?

    Cheapflights users have booked flights from London to Ontario round-trip from $567. This flight start at 21% lower than the current average price 3 months from now.

  • What are the most popular routes from London to Ontario?

    Most travelers choose London Heathrow - Ontario, London Gatwick - Ontario or London City - Ontario when deciding on the best route from London to Ontario.

  • Can I find deals for flights from London to Ontario that include hotel bookings?

    Yes. In addition to deals on London to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from London to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Ontario.

  • Can I find deals for business class flights from London to Ontario?

    Yes. Cheapflights offers flight deals from London to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London to Ontario?

    Currently, January is the cheapest month in which you can book a flight from London to Ontario (average of $553). Flying from London to Ontario in June is currently the most expensive (average of $882). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from London to Ontario

AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$567Average$709FlexibilityNo cancel feeOn-time70%

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