I do not know if they still fly to DYU, as I wrote that the information I have are from the OAG Flight Guide issued OCT 2002.
QH Altyn Air DYU-FRU AN4
Eurasia Airlines DYU-MHD TU3
FV Pulkovo Aviation Enterprise DYU-LED
Samara Airlines DYU-KUF TU5
I don't know if these airlines still flying