News limited has an article that tells us according to SkyScanner the best time to book flights.
The article can be found here
http://www.news.com.au/travel/travel-advice/february-is-the-…
The Cheapest month is February
The Cheapest week is week 2 of November
If going to specific locations then the best times to book in advance is.
Thailand — 20 weeks
USA — 19 weeks
Indonesia —19 weeks
UK — 12 weeks
New Zealand — 6 weeks
Of course these are generalisations based on past trends, and can change. But it gives you some idea and then you can decide if the deal posted here at Ozbargain is fairly good.
They also give details on best and worst months to book per location. Go to the site to get more details, it's worth a look.
I booked an upcoming holiday about 19 weeks ago to Indonesia.
First I booked with Jetstar, who then flipped their schedule and made it a complete PITA, so they refunded.
Decided to spend extra and book with Garuda, because they are a full service airline and their schedules are like clockwork out of Perth, right, right??
Guess what, they did the same thing to us as Jetstar.
Ended up being $700 out of pocket (for 4 people) due to extra accommodation and schedule changes for domestic flights to another city once we arrived in Bali.
I guess all airlines are subject to schedule changes, but I wish they wouldn't do it so often.