This article is under construction. Please excuse the mess.
Space travel in the Divine Universe is performed through various mechanisms, and ranges from slow to faster-than-light / instantaneous.
Instantaneous
Two or more Diasporan Divines are able to form transdimensional gates between each other. (Though it is not strictly space travel, they can also seal off enemy Divines into a sort of pocket dimension using this ability. This requires the Divines forming the pocket remain inside it.)
Stitches are fixed transdimensional gates connecting two points seen in certain parts of the Quire system. They may have been created directly or indirectly by Quire itself.
The Divine Principality uses the Portcullis System, its own system of gates, to travel between star systems. These are controlled by the Divine Space.
Slow
Spaceships attempting to travel between star systems without using the above or other methods of FTL travel will take a long time, on the order of months for neighboring systems. Travel within star systems is more doable.
During COUNTER/Weight, the Apostolosian Empire is known for using ships with golden solar sails to travel outside of established stellar lanes of travel. This technology is passed down to residents of the Twilight Mirage as well as later generations of Apostolosians, and seen in both Twilight Mirage and the Road to PALISADE.
The New Earth Hegemony attacked the Divine Fleet by using sleep detachment squads, who would travel in suspended animation until reaching their destination. This was affected by time dilation, meaning once they arrived everyone they'd known was likely dead. Sleep detachment was also somewhat inaccurate, and some squads arrived hundreds to thousands of years later than others.
The Nobel used a sort of cannon to shoot a pod with Valence inside into the Partizan system. Any potential time differential is unknown, and this technique appears to have no return mechanism.