How to rotate material icon in flutter without animation?

You can wrap your IconButton in a Transform widget using the rotate constructor:

import 'dart:math' as math;

Transform.rotate(
  angle: 180 * math.pi / 180,
  child: IconButton(
    icon: Icon(
      Icons.details,
      color: Colors.white,
    ),
    onPressed: null,
  ),
),