The Andante in C for Flute and Orchestra, K. 315/285e was written by Wolfgang Amadeus Mozart in 1778 and commissioned by Ferdinand De Jean as a possible replacement or alternative second movement for the Flute Concerto No. 1 in G major (K. 313).
Supposedly, the commissioner of the K. 313 concerto, De Jean, disliked the original Adagio and had Mozart compose the shorter Andante to replace it; however, it is also speculated the Andante may have been part of the third flute concerto Mozart was commissioned to write for De Jean but never completed.[1][2]
The piece is written for the same orchestral arrangement as K. 313: a standard set of orchestral strings, two oboes, and two horns.