According to Nookiepedia Bespin is in the Bespin system, the Anoat system is just where the fleet break up and Han pauses to study his options.
So the journey from Hoth to that point (at sub-light speeds) has already taken the Falcon across inter-stella space into another system.
It was a long time ago in another galaxy so maybe they packed star systems a lot closer back then in that place.