Does anyone know where I can watch Pretty Little Liars online?! posted 3 years ago Its like $8 a month and I'm pretty sure they give you a free trial. Helpful (1). It's a bittersweet time for Pretty Little Liars fans. For non-Amazon Prime subscribers (who get free streaming), episodes can be purchased. Network: ABC Family. IMDB Rating: 8/ Sessons: 7. Full Episodes: Watch Stream Online: Pretty Little Liars Series. Download Pretty Little Liars Free.