I've had some good luck with StudentUniverse—they often have exclusive deals for students and young travelers, along with some flexible options that suit unpredictable travel plans. I also keep an eye on Skyscanner for its fare alerts and Student-specific filters, plus Google Flights gives a quick overview so you can compare multiple options. It's all about mixing and matching site features and subscribing to newsletters for flash deals, which has worked well for me in planning budget trips around my flexible schedule.