Promotional tariff with Turkish Airlines is valid for flights between 1st of February till 20th of December 2015. We have managed to find the cheapest flights in November and December 2015. This is based on date of your outbound flight to Hong Kong. Booking has to be done till 31st of of January or until sold out. If you want to compare hotel rooms in Hong Kong offered by leading booking sites you may check here.
Booking samples
Germany - Hong Kong for €427 (directly with Turkish Airlines, travel sample 15.-28.11.2015)
Germany - Hong Kong from €396
Germany - Istanbul - Hong Kong - Germany for €410
UK - Hong Kong for Ł360 (directly with Turkish Airlines)
UK - Hong Kong from Ł333
UK - Istanbul - Hong Kong - UK for Ł328
Austria - Hong Kong for €445 (directly with Turkish Airlines)
Austria - Hong Kong from €413
Austria - Istanbul - Hong Kong - Ausria for €399
Dublin - Hong Kong from €436
Copenhagen - Hong Kong from €454
Booking sample of cheap return flights from Europe to Hong Kong from €396 here. In this case you would be departing from Hamburg to Hong Kong on 8th of November. Your return flight would be then on 21st of November 2015 from Asia back to Germany.