飛んで行く

fly away; go flying

→ 飛ぶ
phrase Uncommon #14,910
fly away; go flying Combines 飛ぶ (to fly) with 行く (to go), indicating movement away from the speaker or a reference point. The exact form 飛んで行く is the plain dictionary form; it can be conjugated, such as 飛んで行った (flew away).
JA: 鳥は空へ飛んで行く。
EN: The bird will fly away into the sky.

飛行機が飛んで行く

The airplane is flying away.

— 鶴は翔んでゆく (1957)

それなのに勝手に飛んで行くんだ

And yet the boat just flies off on its own.

— 紅の豚 (1992)

いま飛んで行くわよ

I'm flying over right now.

— ウィッチ (2016)

僕は月へ飛んで行くつもり

I'm going to fly to the moon.