In general, when looking for the cheapest flight to East London, try to choose a flight departing in May for the best deal.
From most locations, booking your flights to East London around 16 days prior to your departure date finds the best deals.
From most locations, the cheapest flights to East London are found on a Tuesday. Booking a Friday departure is usually the most expensive.
On average you can find the best deals on plane tickets to East London when looking for flights with morning departure times.