Finding cheap airfare is a combination of luck and timing. There are certain times of the year, and even certain times of the week, when tickets are less expensive and flights tend to be more available. The key to finding these cheap tickets is to be aware of your timing and destination, and also to be as flexible as possible on the exact dates of your departure and return.
Nearly every popular destination has an off-season, when tourism slows down and vacation prices drop. These slow periods tend to correspond with bad weather, but there are usually a few weeks on either end when the weather is nice but tourism is still slow. These weeks are the ideal time to travel; not only will your airfare be cheaper, but so will the hotels and restaurants at your destination. Do some research on the area where you are flying: travel books or websites usually give a good estimate of the tourist season.
There are certain times of the year when everyone travels, and prices for flights soar. Avoid "spring break" fares by skipping travel in March and April, especially to warm destinations. Summer is also a busy time, as are major holidays. Airlines can sell these tickets for higher prices because the demand is higher, but waiting a few weeks means demand falls and tickets become less expensive as the airlines try to fill flights.
Flexibility with dates and times for your flights is the best way to find the best deals. Flying mid-week is usually less expensive, because the demand for weekend travel is higher as people try to get back in time for work on Monday. Very early or very late flights are often cheaper, as are flights with layovers or multiple stops. Sometimes airlines offer special rates for different seasons; subscribing to newsletters or email lists for major carriers can keep you aware of current deals that you might otherwise miss. Searching for fares using flexible dates (most fare searches allow you to search three days before and after your chosen date) will help you find the best price and the most convenient schedule for your flight.
