Howard Travel in Trowbridge revealed the damage in a post to Facebook on Thursday (2 January).
"Sad times," the agency wrote. "Following our new year break, we have returned to the office today [Thursday] to find someone has smashed our door window.
"If anyone has any information then please get in touch. We have had the door boarded up so kindly ask our customers to use our side door until we can get this damage repaired."
Branch manager Colin Curtis told TTG on Friday (3 January) the agency had now forked out £250 to replace the broken window.
