Currently there are no direct flights from Ibiza to Luxembourg.

Flights from Ibiza to Luxembourg with one stopover.

Flights via Barcelona (BCN)
From Ibiza (IBZ) with Vueling Airlines
OR
From Ibiza (IBZ) with Iberia Airlines
Transfer at Barcelona (BCN) Then on to Luxembourg (LUX) with Vueling Airlines
OR
Then on to Luxembourg (LUX) with Iberia Airlines
Flights via London Heathrow (LHR)
From Ibiza (IBZ) with British Airways Transfer at London Heathrow (LHR) Then on to Luxembourg (LUX) with British Airways