While it is not mandatory to check in online before a WestJet flight, it is highly recommended for a smoother travel experience. Online check-in typically opens twenty-four hours prior to the scheduled departure time and gives travelers the convenience of selecting their seats, adding any special requests, and avoiding potential long lines at the airport. By checking in online, passengers can simply proceed directly to security screening upon arrival at the airport, and they may also have the option to print their boarding pass or save it on their mobile device. However, for travelers who prefer or need assistance, it is still possible to check in at the airport using self-serve kiosks or by visiting a WestJet counter. Travelers should always refer to the current information available on the WestJet website for specific details related to their flight and check-in procedures.