In general when looking for the cheapest flight to Berlin, try to book your flight during the month of January for the best deal.
In general, most flyers find the cheapest time to book a flight to Berlin is about 60 days prior.
Most of our users find that booking their departure to Berlin on a Tuesday is the cheapest. Conversely, departing on a Friday seems to be the most expensive.
Typically, cheap prices to Berlin are most often found for evening flights. Cheap prices are less likely for midday flights.