Five Australians detained for illegally entering Indonesia's Papua province will find out on Thursday if they face extended jail terms.

Merauke District Court will hand down its decision following separate trials for pilot William Scott-Bloxam and his four Queensland passengers.

The group is accused of entering Indonesia illegally, by travelling to Papua on a small plane from Horn Island, off the tip of Queensland's Cape York on September 12.

The Australians have described it as a sightseeing flight and mistakenly believing they could get visas on arrival in Papua.

Indonesian prosecutors have demanded they all be jailed for three years with fines of 30 million rupiah ($4,000) for the pilot, and 20 million rupiah for the passengers.

The group's lawyer Efrem Fangohoy said the Australians were tense ahead of Thursday's verdict.

"For now they are fine, a little bit tense for sure, they must be questioning in their hearts what will happen tomorrow," he told AAP. "They are hoping to go back to Australia as soon as possible so that they can meet with their families."

The passengers – Vera Scott-Bloxam, 54, Hubert Hufer, 57, Karen Burke, 51, and Keith Ronald Mortimer, 60 – are accused of violating Indonesia's immigration laws and face a maximum six years imprisonment and 30 million rupiah fine.

The pilot William Scott-Bloxam is accused of flying the plane into Indonesia without permission and faces a maximum five years imprisonment and 60 million rupiah fine.

But Fangohoy hoped they would be freed and allowed to leave the troubled province.

"We hope they will be freed, especially the crew member Vera, because crew (members) don't need (a) visa to enter a country," he said. "We also hope the pilot will be released because he was ordered to land."

Papua province has been troubled by a low-level separatist insurgency since the 1960s. Journalists are barred from entering Papua without special permission, and human rights groups have accused the Indonesian military of widespread human rights abuses.