The Western Hume's Leaf Warbler's range overlaps with that of the Yellow-browed Warbler in the western Sayan Mountains, but the species apparently do not hybridize.
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Its range includes in Russia the mountainous regions near Abakan, Sayan Mountains and the Tannu-Ola Mountains; and in Mongolia, the Mongolian Altai, the Govi-Altai, the Khangai Mountains, and the mountains east of Lake Khuvsgul.
The headwaters of the river rise in the Sayan Mountains and flow from there in a northerly direction through Kansk and then in a westerly direction through Zelenogorsk, entering Yenisei at Ust-Kan (43 miles (70 km) north-east of Krasnoyarsk).
In addition to the type location in the Sandy mine in New Mexico, it has been reported from Coat-an-Noz, Cotes-du-Nord, France; in drill core from the North Sea; from Klatovy, Czech Republic; Ishimskaya Luka, northern Kazakhstan; the Slyudyanka complex, Sayan Mountains, near Lake Baikal region of Russia and the Yamoto mine, Kagoshima Prefecture, Japan.