Net profit for the three months ended December fell 19 percent from a year earlier to 245 million ringgit (USD 74.6 million), in large part due to Malaysian currency fluctuations, while revenue remained flat at 1.35 billion ringgit.
For the full year, profit fell 55 percent to 364 million ringgit compared to a year earlier.
AirAsia's 2013 results follow a highly profitable 2012, when the carrier -- growing from a struggling two-plane operation, which Fernandes bought in 2001 -- recorded a 238 percent jump in net profit despite high fuel prices.
"The company needs to continue to be creative in driving margins up," Fernandes said in a statement.
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"We have deferred seven aircrafts in 2014 and 12 in 2015 to later years with intention to swap those aircraft with the new fuel efficient A320 neo," he said.
Operating profit for the fourth quarter declined two percent to 315 million ringgit due to higher aircraft maintenance costs and lower fares, AirAsia said.
Fierce rival Malaysia Airlines announced last week its fourth straight quarterly loss in the last three months of 2013, accumulating a whopping 1.17 billion ringgit loss for the full year.
It has also set up subsidiary budget carriers in Indonesia, the Philippines and Thailand and plans to launch a no-frills joint venture in India.