You can select your seat via Manage Booking anytime up to 48 hours prior to your flight departure, subject to flight eligibility and fare type.
Certain fare types may require an additional fee for seat selection prior to the online check-in period. Customers can enjoy more space by reserving an Extra Legroom Seat for an additional fee.
To understand more, please refer to "Reserve Your Seat – Extra Legroom Seat" product page. If seat selection via Manage Booking is unavailable or you wish to select your seat free-of-charge, you may do so via Online check-in within 48 hours of your flight departure.