Is it permissible to make up for missed days of Ramadan non-consecutively?
Yes, it is permissible to make up for missed Sawm (Fast) on non-consecutive days, as Allah (Exalted be He) says:
...and whoever is ill or on a journey, the same number [of days which one did not observe Saum (fasts) must be made up] from other days.
According to this Ayah, Allah did not stipulate that missed Sawm be made up for consecutively.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.