Can I postpone check-out by one day?
'Posticipare' — stress the fourth syllable: 'pos-ti-ci-PA-re'. 'Pospo' = after, 'cipare' from 'capere'.
Use when you want to extend by exactly one day. More precise than a general extension request.
'Posticipare' = to postpone/push back. 'Il check-out di un giorno' = check-out by one day. 'Di + time period' expresses 'by' in Italian when referring to amounts of time (extend by one day, delay by two hours etc.).
Posso restare un giorno in più?
Can I stay one more day?
Simpler, more informal phrasing
Aggiungiamo solo un giorno?
Can we just add one day?
Uses 'noi' form, collaborative phrasing
Fino a che ora posso fare il check-out se rimango?
Until what time can I check out if I stay?
Asks about the check-out time for the extra day
In Italian hotels, a one-day extension is the easiest to accommodate. The phrase 'nessun problema' (no problem) is the Italian hospitality trademark response to reasonable requests. If they say it immediately, you know you have a good hotel.