Past Tense of “fly”
The past tense of fly is flew; the past participle is flown.
Why “fly” behaves this way
"Fly" descends from Old English "fleogan," a strong verb whose ablaut pattern (fleogan/fleah/flogen) produced the modern flew/flown split. It belongs to the same broad Germanic strong-verb class as "fleon" (to flee), a completely separate verb that Old English speakers already distinguished carefully because confusing them mattered: one meant moving through the air, the other meant running away on the ground, and English has kept them apart as "fly/flew/flown" versus "flee/fled/fled" ever since.
"Fly" and "flee" look so similar that many learners assume they're the same word with a typo, but they're genuinely separate Old English verbs (fleogan and fleon) that happened to end up looking alike after a thousand years of sound change, not a single verb that split in two. Confusing them isn't just a spelling slip — it produces the wrong meaning entirely, since "flown" describes airborne movement and "fled" describes escape.
The common confusion
The most notable modern confusion isn't with "flee" so much as with the regularized form "flied," which exists as a legitimate but narrowly restricted baseball term: a batter "flied out" (hit a fly ball caught for an out), never "flew out" — one of the few places in English where a sport's specialized jargon deliberately overrides the standard irregular conjugation.
How it's actually used
Beyond literal flight, "fly" extends into a wide range of idiomatic and figurative senses — time "flies," rumors "fly," a plan can "fly" or "not fly" (succeed or fail), and someone can "fly off the handle" (lose their temper suddenly) — none of which involve wings or aircraft but all of which keep the identical flew/flown conjugation. The noun "flier" (or "flyer," both spellings accepted) for a printed handout is unrelated in meaning to the verb's flight sense, despite sharing the same root, since a flier doesn't fly anywhere itself. Aviation itself borrowed the verb wholesale for its own specialized vocabulary — a "flight," a "flyby," a "flight plan" — even though none of these compounds actually conjugate the verb; they simply nominalize it, leaving the irregular flew/flown pattern confined strictly to sentences describing an actual act of flying. Entomologists also use the unrelated noun "fly" for the insect order Diptera, a completely separate word from the verb despite an obvious surface connection to the idea of flight, since the insect’s name predates any conscious link to the verb’s conjugation.
Across the tense system
"Flown" appears in a distinctive figurative sense describing time or opportunity having passed irrecoverably — "the moment has flown," "the years have flown by" — a metaphorical extension of literal flight that treats time as something that departs and cannot be called back, parallel to how English also says time "runs out" or "slips away." Military and aviation logs distinguish "flown" (completed sorties, "the pilot has flown forty missions") from "flying" (an aircraft currently in the air), a precise record-keeping distinction that matters for pilot certification and mission counts.
Common real mistakes
The most common real error is using "flied" as a general past tense outside baseball ("the bird flied away" instead of "flew away"), likely by over-applying the sport's specialized exception to ordinary speech. A second frequent slip is confusing "flew" with "fled" in narrative writing under time pressure, since both are one-syllable, past-tense, vowel-only irregular forms that can blur together when a writer is moving quickly through a sentence describing someone escaping by air.
Examples
- The plane flew over the mountains just before sunset.
- She has flown to Chicago twice this month.
- They flew kites in the park all afternoon.
- He had never flown before that trip.
- The bird flies south every winter.
- Time flies when you're busy.
- The batter flied out to center field in the first inning.
- We're flying out early tomorrow morning.
Memory trick
Keep "flee" and "fly" separated by picture: something in the sky "flew," someone running from danger "fled" — different verbs, different vowels, different meanings, despite the visual similarity. And remember baseball's one deliberate exception: a batter "flied out," never "flew out," because that specific phrase is scorekeeping jargon, not ordinary grammar.