In general, when booking your flight to United Kingdom, January is the cheapest month on average.
On average, from most locations, when planning your trip to United Kingdom, try to book your flight in the region of 41 days in advance for the cheapest prices.
From most locations, the cheapest flights to United Kingdom are found on a Thursday. Booking a Monday departure is usually the most expensive.
Typically, cheap prices to United Kingdom are most often found for morning flights. Cheap prices are less likely for midday flights.