In 1991, Letko won the 10,000 metres at the World University Games in Sheffield, England in what was a personal best for her at the time of 32:26.87. Her 31:37.26 at the 1993 World Championships in Stuttgart, Germany was the fourth fastest 10,000 by an American woman. In 1994, Letko won USA 15K Championships at the newly named Gate River Run in Jacksonville, Florida.