when you see a price you like !
Most airlines make seats available for purchase 330 days before departure, so now it is far too early to buy tickets for December 2014 (over 12 months away). Quite often people end up paying a premium if they buy right after the seats are released for purchase, since the airlines reason correctly that people who feel that they must secure their seats very early are willing to pay extra for that.
If you book flights very far in the future the risk of schedule changes is higher. It might turn out that your flight is cancelled because the route is no longer operated every day or that the departure time has changed to one not compatible with your plans. In any case you need to keep monitoring your bookings on the airline web sites so that you will find out about any possible changes early enough to make things right if needed.
Now you have time to decide which airlines you might like to fly, to register with their frequent flyer programs and to request to get e-mail alerts for sales. Emirates is one obvious candidate since you plan to stop in Dubai.
You can now also check the prices for December 2013 which will give a likely upper limit on the price of tickets in December 2014 - most probably you can get them cheaper if you book more than just 1 month in advance. You can also start monitoring the prices looking sites like matrix.itasoftware.com or www.skyscanner.net or www.kayak.com. Look at the prices from airlines which are more likely to be truly available unlike the advertising hyperbole that some third party brokers publish for these search engines.
Most probably you should buy a multi-city ticket into and out of India, including the stop in Dubai. Within India you will have access to cheap fares and plenty of schedule options if you use the local low-cost airlines. I flew on quite a few of them while working in India, and liked SpiceJet. However, your flights won't be very long so price and schedule will really be the most important decision factors.Edited: 20 November 2013, 00:48
Simply put book them as soon as possible (January 2014 is a good enough choice) and book direct from the airlines even it may seem to be a bit inconvenient and more costly initially. Travel agents might fleece you if you have to change your plans. That seems like a possibility as you have not decided on any dates as far as it seems to me. December is the perfect time to visit all the destinations and only delhi will be a bit chilly Goa and Mumbai won't require any wollens.Edited: 23 November 2013, 11:36
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