There are travel seasons for the destination that you are going. Try to find the high, low and shoulder travel seasons. If it's possible, accommodate your travel schedule to the low season because this option is usually the cheapest. When you find a good airfare deal that you feel that it's a really good deal, you have to be prepared to purchase the deal immediately. Do not even try to find a better deal as many great offers disappear as fast as they appear.
Considering some alternatives that are geographical, like some close by airports may be a money saver. Look for prices on the best flight day, which is mid week, like Tuesday, Wednesday and Thursday. These are the best days to book a flight. There's a term call code sharing that you have to be aware of. It is when an airline shares path and plane with a foreign airline of theirs. This is important because the airfares may vary for the same flight for some code sharers.
If you search in the right places repeatedly with determination, there are cheap air tickets for last minute travel deals. Some airlines often give discounted rates varying from few days to half and hour before departure. Try not to purchase one way tickets, get round trip tickets instead as they are often the cheapest deals around. If you are a student, you will probably find a good deal easily as students often get heavy discounts for their air tickets. It will also help if you don't plan your trip during major holidays. There are always cheaper travel deals if you plan carefully and it will save you a lot of money as well. It is also more comfortable to be in a plane that is not overcrowded.
Buy your air tickets from wholesalers. These wholesalers buy in quantities and they usually have a very good discount. If you buy from them, they will give you a good rate too!
It is definitely not easy scouting for cheap airfares unless you do your homework thoroughly. It may be a frustrating process when doing the research but believe me, it will be worth your while.