The win finished Jamaica atop first-round Group A with six points, three better than Cuba. St. Lucia finished last in the three-team group with no points.
Cooper and Salmon both scored in the first 18 minutes to give Jamaica a 2-0 lead in a 4-0 victory over St. Lucia on Sunday. Salmon staked Jamaica to a lead in the 26th minute against Cuba, and Cooper added the insurance in the 60th.
Both Jamaica and Cuba advance along with Trinidad & Tobago and the Cayman Islands, which finish atop Group A last week.
Two other four-team, first-round groups have yet to be played. Barbados, Haiti, St. Kitts & Nevis and the U.S. Virgin Islands will face off October 31-November 4 in Port-au-Prince, while Antigua & Barbuda, Anguilla, Guyana and the Dominican Republic will play November 2-6 in Providence, Guyana.
Eight teams will play in two second-round groups December 5-12 with the group winners qualifying for the CONCACAF finals next year.