The group were travelling in a medium sized ship towards their destination. The planet was owned by the Graylash family so they didn't have a teleporter on board. Of course, they could have traveled to a closer planet owned by the Graylash family and teleported from there, but at the moment most of the factions were traveling using space ships.
This was apparent just on their journey, nearly every planet they went by had large forces of ships protecting them, ready to act on a moment's notice. This was actually advice given by Oscar. After not being able to use teleporters on planet Caladi, they feared that the Dalki now had some sort of teleportation jamming device.
With the information Sam knew, knowing that the vampires had the same type of technology, and one of the great vampire minds was working with the Dalki, there was a good chance this was true. Sam took this more as a fact rather than a guess, and told everyone to start using ships more rather than the teleporters.
