Finding the cheapest airline prices requires knowing the best moments to seize opportunity, such as checking the price of a flight within 24 hours after booking. If that flight's price drops, take advantage of the opportunity to call and cancel the flight and rebook at the lower price without penalty.
If the original flight you booked was non-refundable, that first tip doesn't usually work. However, if you sign up for alerts from airlines, you frequently get updates in your inbox each Tuesday about last-minute deals for the weekend, as airlines would rather have discounted passengers than empty seats.
Wednesdays tend to be the cheapest getaway day, particularly for domestic flights. The most seats are likely to be open, which makes airlines more amenable to providing discounts to get people onboard. The best day to book, though, is Tuesday -- and the best time is 3 p.m. Eastern time, according to Farecompare.com.
Follow your favorite airlines on Twitter and Facebook. Several airlines use social media blasts to promote special fares. Because of the large amount of buzz, though, these deals often go away within a matter of hours.
Departing via one airline and returning on another can also save money if you find cheap one-way flights. Depending on where you live and where you're going, you could leave and return via different airports, both in your home city and at your destination.