That is quite a ways off. Check airfares now- a good site is kayak.com, plus I read somewhere here in the last day about another new site for checking airfares - check that out to. See what airfares are costing.
I grab airfare when I see something that looks like a good buy - only way to tell is to start watching the market. You need to be comfortable with what you are paying and fits your travel itenary.