Very little has been documented about the vocalizations of the Merida Flowerpiercer (Hilty 2011). Meyer de Schauensee and Phelps (1978) attribute a "long, thin trill" to this species, but such a vocalization has not been documented with audio recordings. The apparent song is a short, rapid, jumbled series of musical warbles, lasting about two to three seconds, and changing pitch continuously throughout. Vuilleumier and Ewert (1978) mention, but do not describe, a flight song.
A call is short, high, thin note.