Where are you staying? Most places have a room available where you can leave your luggage, or you can sometimes arrange to keep your room later (for a small fee).
Like the others have said we pay for an extra night & keep the room on right up till we leave for the airport. That way you have somewhere to keep your luggage safe and you get to have a normal last day, shower & change just before the airport run. It only costs a few £
Hi, stayed at the Kent last summer, paid £20 to keep our room on until about 4.30 pm. I asked for a receipt but it was not forthcoming. Still we kept our room and it was worth it.
I always book an extra night when booking the holiday or adjust the booking if the flight changes, it's always cheaper than the hotel charges for keeping the room until 6pm and you have it until you leave.