Book online instead of offline; you'll save money from the paper processing fee.
Clear out your cookies. Why? Many travel websites use the cookies to log when you search for a particular route and will quote you higher when you return to that site to search again.
Many airline websites update their airfare shortly after midnight. A little research about the route you are looking will help you get the best airfares before they are sold.
Stay less than 30 days. Most airfare tariffs have a month's limitation stay restriction. If you require more time, you will pay a higher priced ticket.
If you are traveling with a child under 2 year of age, your child is qualified to travel for free. Buying a separate seat for your child is really expensive.
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