To get to Château de Champlâtreux from Paris, take the A3 motorway towards Lille, then follow signs for the A1/E15 motorway. After approximately 15.5 miles, take exit 3 towards Luzarches. From there, follow D909 to Épinay-Champlâtreux. The château is easily accessible by car or taxi, providing a scenic and convenient journey from Paris.