Incompletely known. south-western and southern Mexico, from southern Sinaloa south to Chiapas; populations in central-western Chiapas (between El Sumidero and Tuxtla Gutiérrez, in Atlantic drainage of Cuenca Central) likely isolated from those along Pacific coast. Possibly also in Guatemala.
 
Population
Estimated population is 20,000 - 49,999 (2010).
Flammulated Flycatcher (Deltarhynchus flammulatus) [XC572772]
by id from Cihuatl\u00e1n, Jalisco, Mexico (song)
Flammulated Flycatcher (Deltarhynchus flammulatus) [XC255906]
by Andrew Spencer from Playa de Oro Road, Colima, Mexico (call)
Subspecies
No subspecies.
Affinities uncertain. No molecular phylogenetic studies have yet included this genus. Currently considered closest to Ramphotrigon, differing in syringeal characters.