In general, when looking for the cheapest flight to Hamburg, try to choose a flight departing in October for the best deal.
In general, most flyers find the cheapest time to book a flight to Hamburg is about 22 days prior.
From most locations, the cheapest day to fly to Hamburg is Sunday. Most users found that departing on a Thursday was most expensive.
Typically, cheap prices to Hamburg are most often found for midday flights. Cheap prices are less likely for afternoon flights.