Two Australian peace activists arrested at a rally in Indonesia earlier this week are expected to arrive in Sydney tonight.

Kylie Moon from Books Not Bombs and Nick Everett, from Action in Solidarity with Asia and the Pacific, were among a number of activists arrested on Wednesday during a protest outside the Presidential Palace in Jakarta.

Ms Moon says the pair were in police custody for more than 30 hours before being deported to Singapore yesterday.

She says Indonesian authorities have indicated they will be denied re-entry in the short term.

"Myself and my friends from Australia and South Korea and South Africa that were arrested have all been blacklisted, so that means that we are not able to enter Indonesia for a period of time, the Indonesian Government refuses to state how long that will be for," she said.