Flies marks a creative reunion between Eimbcke and Franco, who began their careers together making short films in the 1990s. The screenplay was written by Eimbcke and his longtime collaborator Vanesa Garnica. The project was presented as a work-in-progress at the
San Sebastián International Film Festival as part of the WIP Latam showcase. Eimbcke introduced the film alongside other Latin American projects selected for the industry platform. The film is produced by Eimbcke's banner Kinotitlán in collaboration with Franco and Núñez Larios through their production company Teorema. Actress Teresita Sánchez was announced in the lead role of Olga during the presentation. == Release ==