Never assume that any airfare is the lowest available without checking the price offered by the competition.
Be sure to compare low-cost carriers with major carriers that fly to your destination. Remember, the best fares may not be out of the airport closest to you.
Airline frequent flier clubs are free. Join the clubs for every airline you might fly with, even if you only travel occasionally.
When redeeming earned frequent flier miles, always check first for lower fare offers to the same destination. Using your earned miles is not always the best deal.