There are many institutes in India which offer this course. You can pursue Diploma courses in Air Hostess training or cabin crew and hospitality course from any reputed institutes. The best institutes from where You can do these courses are:
Air Hostess Academy (AHA), Bangalore
Lovely Professional University, Punjab 
Air Hostess Academy (AHA), Delhi/NCR, Mumbai, Pune
Frankfinn Institute of Air Hostess Training, Mumbai, Delhi/NCR
Avalon, Spice star, Rajiv Gandhi Memorial College of Aeronautics, Jaipur 
Universal Aviation Academy (UAA) Chennai
Jet Aviation Academy. Indira Gandhi Institute of Aeronautics (IGIA). .

You can pursue Diploma courses in Air Hostess training or cabin crew and hospitality course from any reputed institutes. You can also do B.Sc. In Aviation, Hospitality and Tourism. Educational qualification for a cabin crew is 12th. Requirements to be a cabin crew :
Fluent English
Passionate for delivering excellent service on every occasion
Being trustworthy and reliable
Being correct and precise in their job
Proactively seek solutions and take personal responsibility for resolving problems
Be willing and able to work shifts
Minimum age of 18 or 21, depending on the airline
Minimum height of 158cm or 160cm, depending on the airline
Being able to swim
No visible tattoos or body piercings while wearing the uniform
No criminal record
Right to live and work in that country you will be based at or being able to get a working visa in that country
Have a healthy BMI
Minimum high school education
Have a valid Passport
DGCA (the Indian regulatory authority which is responsible for regulatory and safety oversight of Indian aviation, and a lot more), specifies that Cabin Crew need to be trained on the Specific type of aircraft they work on. This is called Safety and Emergency Procedures (SEP) training and is specific to a particular type of aircraft (For example, Cabin Crew with SEP card from Go Air can join Indigo without a full training again because both the airlines operate the same type of aircraft-A320 but crew with a SEP card on ATR-72/Q-400 of Jet/Spice Jet cant have to get trained afresh on A320 if joining Indigo or Go Air by that airline), this training deals with crew understanding of aircraft, response in case of emergency etc. , which is the primary duty of cabin crew. A SEP card is issued to the crew after they

You can pursue Diploma courses in Air Hostess training or cabin crew and hospitality course from any reputed institutes. You can also do B.Sc. In Aviation, Hospitality and Tourism. Educational qualification for a cabin crew is 12th. Requirements to be a cabin crew :
Fluent English
Passionate for delivering excellent service on every occasion
Being trustworthy and reliable
Being correct and precise in their job
Proactively seek solutions and take personal responsibility for resolving problems
Be willing and able to work shifts
Minimum age of 18 or 21, depending on the airline
Minimum height of 158cm or 160cm, depending on the airline
Being able to swim
No visible tattoos or body piercings while wearing the uniform
No criminal record
Right to live and work in that country you will be based at or being able to get a working visa in that country
Have a healthy BMI
Minimum high school education
Have a valid Passport
DGCA (the Indian regulatory authority which is responsible for regulatory and safety oversight of Indian aviation, and a lot more), specifies that Cabin Crew need to be trained on the Specific type of aircraft they work on. This is called Safety and Emergency Procedures (SEP) training and is specific to a particular type of aircraft (For example, Cabin Crew with SEP card from Go Air can join Indigo without a full training again because both the airlines operate the same type of aircraft-A320 but crew with a SEP card on ATR-72/Q-400 of Jet/Spice Jet cant have to get trained afresh on A320 if joining Indigo or Go Air by that airline), this training deals with crew understanding of aircraft, response in case of emergency etc. , which is the primary duty of cabin crew. A SEP card is issued to the crew after they

Frankfinn institute of Air Hostess Training New Delhi js certainly the best with top class practical learning and flight turnaround exposure.

The college has best learning pedagogy and offers hands on experience with inteenship opportunities and has dedicated placements cell.

All top 10 colleges in India shared below.

http://www.indiaeducation.net/top-colleges/air-hostess-training/