When booking through Onthefly.com, the ability to choose your seat typically depends on the specific airline and the type of fare you select. Many airlines allow seat selection during the booking process, while others may offer it as an additional option after the initial purchase. In some cases, certain fare classes may not include the option to select a seat in advance, requiring customers to wait until check-in. It is also possible that fees may apply for selecting preferred seats. For the most accurate and up-to-date information regarding seat selection and associated fees, it is advisable to refer to the details provided on the Onthefly.com website during the booking process. This will provide you with the necessary guidance based on your selected flight and airline.