Chapter: It is permissible to fast or not to fast during Ramadan for one who is travelling for no sinful purpose, if his journey is two stages or further. But it is better for the one who is able to fast without suffering any harm to do so, and the one for whom it is difficult may break the fast
Authentic
hadith of Sahih Muslim
Sahih Muslim 1116c
نُسَافِرُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي رَمَضَانَ فَمَا يُعَابُ عَلَى الصَّائِمِ صَوْمُهُ وَلاَ عَلَى الْمُفْطِرِ إِفْطَارُهُ .
Abu Sa'id al-Khudri (Allah be pleased with him) reported:
We went out on an expedition with the Messenger of Allah (ﷺ) during Ramadan and neither the observer of the fast was found fault with for his fasting, nor the breaker of the fast for breaking it.
Reported by Muslim (No. 1116c) and At-Tirmidhi (No. 712).
‘Ā'ishah (may Allah be pleased with her) reported: Hamzah ibn ‘Amr al-Aslami asked the Prophet (may Allah's peace and blessings be upon him): "Should I fast while traveling?" - and he used to fast often - He answered: "If you wish then fast, and if you wish then do not fast."