The pair are accused of rubbing the highly toxic VX nerve agent on Kim's face as he waited for a flight. They have pleaded not guilty to murder, saying it was a TV prank and they were tricked by North Korean agents.
Pyongyang has denied any involvement in the 13 February killing, but four men - believed to be North Koreans who fled Malaysia on the day of the murder - have also been charged in the case.
Halfway during the visit, Aisyah burst into tears while Huong also appeared unwell, reported AFP news agency.
They were accompanied by their lawyers and the judge presiding over the trial. The visit was aimed at giving those involved in the case a better understanding of the events.
If found guilty, the women face the death penalty. Their defence lawyers are likely to argue that the real culprits are North Korean agents who fled Malaysia. Kim, who was in his mid-40s, was the estranged older half-brother of North Korean leader Kim Jong-un.
At the time of his death, he was believed to have been living in self-imposed exile in Macau and was thought to have had some links to China.