The Cordilleran Flycatcher, Empidonax occidentalis, is a small insect-eating bird. It is a small Empidonax flycatcher, with typical length ranging from 13 to 17 cm. Adults have olive-gray upperparts, darker on the wings and tail, with yellowish underparts; they have a conspicuous teardrop-shaped white eye ring, white wing bars, a small bill and a short tail. Many species of this genus look closely alike. The best ways to distinguish species are by voice, by breeding habitat, and by range. This bird is virtually identical to the Pacific-slope Flycatcher. These two species were formerly considered a single species known as Western Flycatcher. The Pacific-slope is a breeding bird of the Pacific Coast forests and mountain ranges from California to Alaska; the Cordilleran is a breeding bird of the Rocky Mountains. They have different songs and calls.

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