Cheap flights from Ontario (ONT) to London (LON)

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The best prices from Ontario to London are usually found in August or January, booked 53 days in advance, depart on a Tuesday or Sunday and return on a Sunday

How to find the cheapest flight from
Ontario (ONT) to London (LON)

All the information you need to plan the best ONT to LON flight in 2021: compare Ontario to London flight prices with the expected peak season, weather and rainfall in London.
ONT - LON
Price
$407 - $700
LON
Temperature
48.2 - 73.4 °F
LON
Rainfall
1.4 - 2.8 inches

Popular in

June

High demand for flights, 27% potential price rise

Cheapest in

August

Best time to find cheap flights, 21% potential price drop

Average price

$500

Average for round-trip flights in May 2021

Round-trip from

$407

From Ontario to London

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Ontario to London?

Leaving on a Monday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 29% on the overall cost on flights from Ontario to London.

How far in advance should I book a flight from Ontario to London?

To save on the cost of your flight from Ontario to London, book at least 61 days before your planned departure. Booking around this time can save you about 44% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $910 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $1,146.

What is the cheapest month to fly from Ontario to London?

Flights from Ontario to London lean towards being more expensive in July. Prices are generally better when you fly from Ontario to London in October, with the cheapest ticket starting at $445.

When is the cheapest time to fly from Ontario to London (ONT - LON)?

When flying from Ontario to London, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 14% versus a flight at noon.

Cheap flights from Ontario to London in May, June 2021

The best prices found for ONT to LON flights for May, June
14 Jun - 27 Jul
$821pp
ONT
Ontario
American Airlines
   
2 STOPS
LGW
London Gatwick
LGW
London Gatwick
American Airlines
   
2 STOPS
ONT
Ontario
8 Jun - 16 Jun
$831pp
ONT
Ontario
KLM
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
KLM
   
2 STOPS
ONT
Ontario
13 Jun - 27 Jul
$832pp
ONT
Ontario
KLM
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
KLM
   
2 STOPS
ONT
Ontario

Ontario to London 2021 flight deals

Cheap flights to London from Ontario found for this year
21 Sep - 28 Sep
$794pp
ONT
Ontario
United Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
United Airlines
   
2 STOPS
ONT
Ontario
21 Sep - 28 Sep
$809pp
ONT
Ontario
Multiple Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Multiple Airlines
 
1 STOP
ONT
Ontario
23 Nov - 3 Dec
$812pp
ONT
Ontario
American Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
American Airlines
 
1 STOP
ONT
Ontario

Last minute flights from Ontario to London

Late deals on round-trip flights to London from Ontario, departing today and this week
19 May - 2 Jun
$1,311pp
ONT
Ontario
Delta
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Delta
   
2 STOPS
ONT
Ontario
19 May - 1 Jun
$1,317pp
ONT
Ontario
American Airlines
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
American Airlines
 
1 STOP
ONT
Ontario
19 May - 3 Jun
$1,319pp
ONT
Ontario
Delta
 
1 STOP
LHR
London Heathrow
LHR
London Heathrow
Delta
 
1 STOP
ONT
Ontario

One-way flights to London from Ontario

The cheapest one-way flights from Ontario to London
2:20 am - 3:40 am
United Airlines
2 Stops
17h 20m
ONT - LHR
United Airlines
$670
United
5:45 pm - 2:20 am
American Airlines
2 Stops
24h 35m
ONT - LHR
American Airlines
3:45 am - 5:30 am
Delta
2 Stops
17h 45m
ONT - LCY
Delta
$715
Delta

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Ontario</span> to <span class="emphasized">London</span> flights.

Flight FAQs

From Ontario to London

Are flight prices decreasing from Ontario to London due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Ontario and London for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Which airlines flying from Ontario to London have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like American Airlines, British Airways, and United Airlines flying from Ontario to London have implemented new flexible cancellation policies.

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

Most people fly from Ontario (ONT) if they book a flight from Ontario to London. On average, Ontario has 0 outbound flights to London per day from 7 airlines. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

Can I find flights from Ontario to London for under $800 on Cheapflights?

Yes, there are multiple flights from Ontario to London for under $800. The cheapest flight booked recently is on United Airlines for just $794, but on average you can expect to pay $831.

Are there nonstop flights from Ontario to London for under $800 on Cheapflights?

There are no nonstop flights from Ontario to London, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.

Are there last-minute flights available from Ontario to London for under $1,400?

There are currently 20+ open flights from Ontario to London within the next 7 days for less than $1,400.

Is Ontario weather warmer or cooler than London?

Temperatures around the 95 °F's can be experienced in July. The weather in London is colder than in Ontario. Plan for potential changes in flight availability as peak weather approaches in this location.

How long is the flight from Ontario to London?

For as low as $794, United Airlines can have you in London from Ontario in 13h 10m. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

What are the cheapest airlines flying from Ontario to London round-trip?

Flying on United Airlines is currently your cheapest option to London, with prices starting at $794. Additional round-trip tickets that might be worth considering are offered by American Airlines and Air Canada, with the lowest prices starting at $812 and $813, respectively.

What are the cheapest airlines to fly from Ontario to London one-way?

One-way options have recently been found by users for as low as $664 on Delta. Other airlines that offer cheap prices include United Airlines from $670 and American Airlines from $690 one-way.

Alternative routes for Ontario to London

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for London

Things to know before you go - useful duration and weather info for your trip from Ontario to London.
Today's exchange rate
$1 = £0.71
Average temperature for May in London
64.4 °F
Avg rainfall for May in London
2.0 ″

Airports servicing Ontario

Airports servicing London

Gatwick (LGW)
City (LCY)
Stansted (STN)
Luton (LTN)
Southend (SEN)

Top 5 airlines flying from Ontario to London

The chart below displays the airlines Cheapflights users traveling from Ontario to London choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Air France
$453 $614 No cancel fee 77%
Delta
$374 $631 No cancel fee N/A
American Airlines
$366 $645 No cancel fee 71%
United Airlines
$379 $654 No cancel fee 69%
British Airways
$350 $680 No cancel fee 70%
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