After shakedown in the Caribbean, Porter sailed in convoy 24 April 1917 escorting the first US troops to Europe. She arrived at Queenstown, Ireland on 4 May, where she was based during World War I, meeting and escorting convoys from the U.S. as they entered the war zone. Kept busy as a convoy escort, she severely damaged U-108 on 28 April 1918, while the German submarine was steaming to intercept a convoy. Operating from Brest after 14 June, she returned to the United States at the end of the war.
After World War I, Porter operated off the East Coast and was decommissioned 23 June 1922. Transferred to the Coast Guard on 7 June 1924, she was returned to the Navy 30 June 1933 and disposed of by scrapping under the terms of the 1930 London Treaty for Limitation of Armament the following year. Her name was struck from the Navy List 5 July 1934 and her materials were sold 22 August 1934.