Kindly refer to the following link(s):
Fasting Ramadan and celebrating Eid al-Fitr while traveling
I began 29th Day of fasting & traveled to a country celebrating Eid, should I break my fast?
Traveled to another country that started fasting later should I fast 31 days with them
Started fasting in UAE, going to India, do I fast & make eid according to UAE or India