How to Cancel Best Buy Order ? You can cancel an order with Best Buy within 6 hours, according to Best Buy's Return and Exchange Policy. Standard Best Buy policies apply, including returns of burned items or media (CDs, etc.). Best Buy reserves the right to refuse any return or exchange. Returns are generally accepted within 15 days. https://sites.google.com/d/1eZCfSCHHWM8EgHK8LYbymuuJeW7MV3S7/p/1wuf6yBvo_88roF5jCur7162tJAiaNY0x/edit