last day of Cebu Pacific promo sale

july 20 is the last day of Cebu Pacific's promo on its low airfare. i have been thinking if i have to rebook my previously-purchased ticket since i am planning to stay longer in surigao city by just another day on my upcoming vacation there. in that case, i will have to add a rebooking fee of P400 for that. i am still weighing the pros and cons considering also that i would be absent from office for additional day. i have to decide today or else if i defer it, i would be paying difference between the regular fare and promo fare on top of the rebooking fee.

well, i have until midnight to think this over..