Did Rey flew Luke’s X-Wing without an astromech droid?
Yes, but I’m assuming the Wayfinder may have fulfilled that need. Luke also reached Ach-To without an astromech, so either that X-Wing doesn’t need an astromech or maybe both Rey and Luke used the Force to guide them. Or a mix of both.
Luke used a Jedi compass to find Ach-To. As explained page 53 of The Rise of Skywalker Visual Dictionary. And the story of how Luke got hold of this Jedi compass is told in one chapter of the solo campaign of the video game Star Wars Battlefront II.
But why and how Luke drew a map to Ach-To, hid one part of this map in R2-D2 and the second part in a USB drive kept by who-was-this-guy hiding on Jakku?