41 C.F.R. § 302-4.200
Per diem rate for employee and immediate family members for en route relocation travel within CONUS
The per diem rate for en route relocation travel between the old and new official stations will be at the standard CONUS rate (see applicable FTR Per Diem Rate Bulletins available at https://www.gsa.gov/perdiem). Reimbursement will be in accordance with §§ 301-11.19 through 301-11.22 of this subtitle.