Oil futures fell Monday, with U.S. benchmark prices at their lowest in almost six weeks as the immediate risk of a bigger U.S.-Iran conflict continued to fade, easing worries about potential global supply disruptions. February West Texas Intermediate oil CLG20, -1.71% declined by 96 cents, or 1.6%, to settle at $58.08 barrel on the New York Mercantile Exchange. That was the lowest finish for a front-month contract since Dec. 3, according to FactSet data.