Cambodia, China (mainland), India, Japan, Laos, Malaysia, Myanmar, North Korea (B), Russia (Asian), South Korea, Taiwan (China), Thailand, Vietnam.
Vagrant to Singapore.
Breeds south-eastern Russia (Amurland, Ussuriland), extreme north-eastern China (eastern Manchuria) and northern Korea. Non-breeding south-eastern Asia (southern Myanmar east to Cambodia and southern Vietnam, south to southern Thailand), occasionally Hainan I.
 
Population
Estimated population is unknown (2010).
Pale-legged Leaf Warbler (Phylloscopus tenellipes) [XC571517]
by Marta Celej from Yeongweol, Gangwon-do, South Korea (song)
Pale-legged Leaf Warbler (Phylloscopus tenellipes) [XC889908]
by Bram Piot from Haikou, Hainan, China (call)
Subspecies
No subspecies.
Has been considered conspecific with Sakhalin Leaf-Warbler (Phylloscopus borealoides), but differs vocally. Has in the past been considered conspecific with Ijima's Leaf-Warbler (Phylloscopus ijimae).