Dark does ×1 to Flying

Generations VI to IX, single types. The other way round, Flying against Dark, is ×1.

69 Dark and 109 Flying species among the 1025 this site covers.

Attacker, Dragon and Dark Roaring Moon sprite

damage×1Generations VI to IX

Defender, Fire and Flying Ho-Oh sprite

Ho-Oh #0250

Dark did not exist in Generation I, so Dark against Flying has no value there.

Strongest Dark attackers

Roaring Moon leads Dark at Atk 139

Sturdiest Flying defenders

Dual types that change the answer