Bersih has denied the allegations by Red Shirts leader Jamal Md Yunos and is mulling legal action over the issue.
"Bersih has no connection with any terrorist groups whatsoever.
"We have no plans to gather at any airports in Malaysia and will follow the convoy and rally schedule as publicised in our media statements, website and social media.
"The allegations are baseless and are made with ill intentions to strike fear and violence," said its steering committee in a media statement.
The committee said it is also assessing all legal options in dealing with such malicious allegations and will hold all those responsible who fabricate and circulate them.
Bersih, it added, is and will remain a people’s movement with its clear objective to peacefully strive for democratisation through electoral and institutional reform.
Earlier, Jamal claimed that Bersih plans to surround Putrajaya and airports during its Nov 19 rally.
The Red Shirts leader said he had been informed that the electoral watchdog has been infiltrated by the Islamic State (IS).
Jamal also revealed that his movement would mobilise its members and supporters to counter Bersih’s nationwide convoy and rally.