Fastest option: leave at 11:12, arrive 12:14 (62 min, 1 change).

The 10:39 trip leaves only 4 min to change from Kirchberg, Rout Bréck - Pafendall (Bus) to Pfaffenthal-Kirchberg, Gare (3 min walk); a delay could make you miss line RE.

1st class on trains is not free; buy a 1st-class ticket (CFL app or ticket machines) before boarding.

Public transport inside Luxembourg is free since 1 March 2020: buses, the tram and trains in 2nd class need no ticket.