We used to travel with the Prophet (ﷺ) and neither did the fasting persons criticize those who were not fasting, nor did those who were not fasting criticize the fasting ones.
Sahih al-Bukhari Book 30, Hadith 54
← Previous Hadith Allah's Messenger (ﷺ) was on a journey and saw a crowd of people, and a man was being shaded (by them). He asked, "What is the matter?" They said, "He (the man) is fasting." The Prophet (ﷺ) said, "It is not righteousness that you fast on a journey."

Sahih al-Bukhari Book 30, Hadith 53 Next Hadith → Ibn `Abbas said, "Allah's Messenger (ﷺ) set out from Medina to Mecca and he fasted till he reached 'Usfan, where he asked for water and raised his hand to let the people see him, and then broke the fast, and did not fast after that till he reached Mecca, and that happened in Ramadan." Ibn `Abbas used to say, "Allah's Messenger (ﷺ) (sometimes) fasted and (sometimes) did not fast during the journeys so whoever wished to fast could fast, and whoever wished not to fast, could do so."

Sahih al-Bukhari Book 30, Hadith 55