Liberian Refugee Immigration Fairness Act of 2018 This bill directs the Department of Homeland Security to adjust to permanent resident status a qualifying Liberian national who: (1) has been continuously present in the United States between November 20, 2014, through the date of status adjustment application; or (2) is the spouse, child, or unmarried son or daughter of such an alien. Adjustment applications must be filed not later than one year after the date of enactment of this bill.