Flew is the past tense of fly. As a noun in rare poetic or archaic use, it can refer to something that has flown. In modern usage, it most often appears in the verb form “flew,” indicating motion through the air in the past, and is frequently contrasted with ‘ran’ or ‘stayed.’ The pronunciation corresponds to /fluː/ in many contexts, but when used as a noun, its pronunciation remains the same in standard speech.
Full pronunciation guide