I'm looking for a direct bus from Guatemala City to Managua without an overnight stop in San Salvador. Does it exit? Gracias.
1

louisg
As far as Y know, all buses stop for the night in El Salvador.
Check their websites: Pullmantour, Ticabus, King Quality.
4

jimbuktoo
King Quality has a couple that leave early from Guatemala City, stop briefly in San Salvador, then go on to Managua. Here's the sked:
link
Pro tip