I have two codes that are used for Lift (L-Y-F-T) and U-b-e-r. Both give $20 free rides so that covers pretty much the Departure trip and the Return trip.
My (L-Y-F-T) code: MICHAELJAY710907
My U-b-e-r code: 9kzytue
Just download the two apps and enjoy your free rides! P.S It has to be your first time using either of the two or it won't!