"Other than departure flights that have completed the check-in process and the arrival flights already heading to Hong Kong, all other flights have been cancelled for the rest of today", the authority said in a statement.
Metro stations in Hong Kong resumed regular service on Monday and streets were being cleaned of debris as the city recovered from another night of violent clashes between anti-government protesters and police.
Police also dressed up as protesters, wearing black clothing and yellow hard hats as a disguise, to surprise and arrest protesters.
Although the government has now suspended the bill, which would have allowed extraditions to mainland China, demonstrators want it to be fully withdrawn.
Hong Kong's airport is a major regional hub, handling 1,100 passenger and cargo flights daily, with services between the city and about 200 global destinations.
"Independence for Hong Kong is not viable in the near term", acknowledged protester Sam, 23, a barrister, while music pumped from cabaret lounges in Wan Chai's bar district behind him, "But we have to fight for our freedoms and democracy".
A massive traffic jam soon formed on the highway leading back to Hong Kong's city center.
Police arrested anti-extradition bill protesters amid the chaos, following petrol bombs explosions and make-shift steel used barricades to block off roads.
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Police stormed a number of underground train stations, firing tear gas and arresting protesters.
Hong Kongers chose to take to the streets day and night because their democratic system has been greatly eroded, and problems generated by ineffective government and an out-of-control police force can not be addressed through the political system, he said.
"Youngspiration hereby urge governments of the world and all freedom-loving people on Earth, to stand against China, the Enemy of Humanity, and its executioners, the Hong Kong Police Force and the incompetent Carrie Lam government", it said.
"The foreign secretary condemned violent acts by all sides but emphasised the right to peaceful protest, noting that hundreds of thousands of Hong Kong people had chosen this route to express their views".
In a statement, the airport said operations had been "seriously disrupted" by the public assembly. In response, the police fired tear gas to disperse protesters at three location: Sha Tin, Tai Wai, and Tsim Sha Tsui. The Chinese foreign ministry in Hong Kong declared that those remarks revealed the "dark and twisted side of U.S. psychology".
China is also putting pressure on big companies, such as Cathay Pacific Airways (0293.HK), whose shares tumbled to close to a 10-year low on Monday, after it was told to suspend staff engaged in illegal protests.
A Hong Kong Outlanders representative, who identified himself as "Kuma", said the Hong Kong government claimed that a general strike staged on Monday last week was aimed at destroying the territory's economy by dividing the people.
"We are leaderless, and practically everything is being decided by those on the front lines, and we follow along", said a protester who gave his surname as Cheung. China has reportedly threatened to bar air crew who take part in protests from its air space.