Bishop seeks details of missing flight

The federal government is urgently seeking to determine whether any Australians are onboard a missing AirAsia flight, foreign minister Julie Bishop says.

Foreign minister Julie Bishop.

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Initial reports out of Indonesia indicate there were no Australians on board.

Ms Bishop told AAP she has spoken with the Indonesian ambassador to Australia, Najib Riphat Kesoema and has been trying to confirm details of the missing plane.

The Australian embassy in Jakarta, Indonesia and Australian High Commissioner in Singapore are making enquiries with local authorities.

Singapore's Prime Minister, Lee Hsien Loong, posted a tweet saying his "thoughts are with the passengers and their families."

Indonesia's air transportation director general Djoko Murjatmodjo said the plane was carrying seven crew and 155 passengers - 138 adults, 16 children and a baby, updating earlier figures.

Local broadcaster MetroTV reported that the passengers included 149 Indonesians, three South Koreans, including a baby, one Briton and one Malaysian and one Singaporean.