Officials today 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 based on comfort, convenience, cleanliness and customer service.
Reviews posted on the site mentioned "dilapidated facilities", dishonest airport workers - particularly taxi drivers - long waiting times and rude officials.
"These are old issues," Terminal 1 manager Dante Basanta told AFP, adding that the problems were already being addressed by the government.
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Terminal 1, the oldest of its four passenger terminals, was built 32 years ago.
The government has launched a 2.5-billion-peso (USD58 million) renovation programme for the terminal.
It is also attempting to decongest it by moving at least three million passengers a year to a newer terminal.