I am a student and I am going to complete my studies this April and I will go back to India permanently. I live in a shared WG and we are paying the [ARD ZDF Deutschlandradio Beitragsservice](https://en.wikipedia.org/wiki/Beitragsservice_von_ARD,_ZDF_und_Deutschlandradio) fee from my reference number. I want to de-register from ARD. I will de-register from the city hall by mid of April as I will leave by end of April to India. 

What is the procedure to de-register from ARD. Can anyone please guide me through the same? 

Will a flight ticket to India suffice as proof that I am moving out of Germany? Or what else is required? I will not be here from 1st of May. I guess I have to move out from Germany within 15 days of my de-registration from the city office. So, I don't know if that period is sufficient to de-register from ARD.