Most of the low cost airlines provide seat sales during off-peak season of the year and especially, during winter. We can get discount cheap airfare during this type of sales. One more idea is to travel from less busy airports where we can get air fares lower than cheap flight airfare.
Booking tickets well in advance
The first few seats on any aircraft are offered at cheap airfare rates, so if you book well in advance you can enjoy the facility of cheap flight airfare.
Avoiding booking during school holidays
Normally the air fares are very demanding during season, peak business hours and especially during the school holidays. So, avoid booking during holidays.
Taking advantage of price wars
You can take advantage of the price wars between two airlines that operate flights for the same route. Each one tries to throw one out of the market by offering discount flights with cheap airfare tickets. You can use Google search tool to compare and find out the airlines offering low-cost cheap flight airfare.