How far ahead do I need to buy plane tickets

I bought mine 4 months in advance. Typically you can get better deals when booking far in advance.... also less chance of getting stuck in a middle seat!

If you purchase non-refundable, at least 21days in advance, you should get the best fares. The closer to departure the more expensive the ticket. Some airlines will charge you extra for the best seats, the ones with the most room. It may be worth paying for.

Normally flights are cheaper at least 2 weeks out. However, based on timing, flight load, etc i've actually had super cheap flights at the last minute.

However, to get the best seats you need to book as early as possible - AND pay extra for the better seats. They won't be wider, but you may get more leg room in the front rows. Many airlines allow you to purchase those seats and they are well worth every cent.

Be sure to check your bag especially on the return flight - you do NOT want to be lifting your bag into the overhead as you'll be on a weight lifting restriction.

dont know how true this is but I read an article on Yahoo the other day that the cheapest time to buy for a flight is exactly 49 days before your trip. Again not sure if its true they said the data came from all the online booking sites averages.