We do not have enough data on this route to provide a reliable graph showing how many days before departure it is the best to book.
However, usually the closer it is to the departure, the more expensive the tickets are.
The most popular airlines on the route Singapore - London: Malaysia Airlines (MH), Etihad Airways (EY), Qatar Airways (QR).
The cheapest flights are on the route Changi (SIN) - Heathrow (LHR).
Direct flights last about 14h 10min.
Direct flights available on: Monday.
Direct flights: Virgin Atlantic (VS).