Yes! I usually make my homemade chicken salad sandwich about 20-60 minutes ahead. This allows the flavors to develop and the sandwich to chill, wrapped, in the fridge. However, you can make the chicken salad (filling) up to 3 days ahead and store it in an airtight container in the fridge. The sandwich itself must be assembled up to 60 minutes before serving; otherwise, it can become soggy!