He fasted along with the people of the city for thirty-one days, and during that time he travelled for one day, when he did not fast because of travelling; does he have to make up that day?
Question

                If a person travels to another city during Ramadan, and completes the fast with them, so that the total number of days he fasted was thirty-one days, and he started fasting on the thirty-first day, following the people of that city, then during that day he travelled and broke his fast because of travelling, does he have to make up that day? Does he have to break the fast if he reaches a city after Zuhr, for example, where the people are not fasting, because for them it is the day of Eid?
Praise be to Allah.
      I put this question to our Shaykh, ‘Abd 
      ar-Rahmaan al-Barraak (may Allah preserve him). 

    He replied: 

    Yes, he has to make it up, because fasting 
    that day was obligatory for him, and he broke his fast because he had an 
    excuse. 

    Likewise when he reaches a city where the 
    people are not fasting, then he has to break the fast with them, because the 
    ruling he should follow in that case is the ruling of the people of the city 
    to which he travelled. 

    But if he set out travelling before Fajr, 
    then he does not have to do anything, because the ruling on fasting before 
    dawn breaks does not apply to him. 

    End quote. 

    For more information, please see:
    71203, 45545 and
    217122. 

    And Allah knows best.