Born in Waltham, Massachusetts, Sonja Blomdahl earned a B.F.A. degree in 1974 at Massachusetts College of Art, where she studied with Dan Dailey. In 1976 she spent six months at Glasskilan, the Orrefors glass factory in Sweden. In 1978, while working as Dailey's assistant at Pilchuk Glass School in Stanwood, Washington, she observed Italian glassblower Checco Ingaro's use of the incalmo technique, which involves joining two bubbles of blown glass. This technique suited Blomdahl's exploration of symmetrical form and color in glass spheres.
Blomdahl has held teaching positions at Pratt Fine Arts Center in Seattle, Haystack Mountain School of Crafts in Deer Isle, Maine, and the Appalachian Center in Smithville, Tennessee.
Kenneth R. Trapp and Howard Risatti Skilled Work: American Craft in the Renwick Gallery (Washington, D.C.: National Museum of American Art with the Smithsonian Institution Press, 1998)