Officials on Friday brushed off the survey results, insisting conditions were being improved.
"The Guide to Sleeping in Airports" website said Manila's crowded Terminal 1 was ranked the world's worst by travellers predicated on comfort, convenience, cleanliness and customer service.
Continue after the break.
Reviews posted on the website mentioned "dilapidated facilities", dishonest airport workers — particularly taxi drivers — long waiting times and rude officials.
"They're old issues," Terminal 1 manager Dante Basanta told AFP, adding that the issues were already being addressed by the government.
He conceded that the Manila airport, with a capacity of about 6.5 million passengers annually, was overstretched, handling 8.1 million travellers last year.
Terminal 1, the oldest of its four passenger terminals, was built 32 years ago.
The federal government has launched a 2.5-billion-peso ($58 million) renovation programme for the terminal.
It can also be attempting to decongest it by moving at least three million passengers annually to a newer terminal
