We need more information in order to be helpful.
- What is your starting city?
- On what program do you want to earn miles?
If you are starting from North America and you want miles on * Alliance, you can fly to SIN. Then get an award ticket (or buy a ticket) to CMB for 20K RT in coach. You can then begin your trip from there.
But I am confused by the request being in the India forum, and wondering how that plays a part.