This question already has an answer here:
Ok so I know that rule of thumb for booking flight tickets is 'earlier the better' but I am not sure how far in advance should the action be taken. I have seen many cases where the min. prices at say 4 months before travel dates are higher than 3 months before, this I believe is primarily due to a new flight route being added or some complex airline thingy beyond me but this almost always happens. Also let me know if this is common or I am mistaken here.
So I am asking what is the time line that I should draw untill I look for better deals and book the flight eventually. I have to travel in last week June and return around 1 week Aug, I am open to changes in travel dates by 1 week in both direction and both ways.