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"I was told by Kelly that at the end of the summer we're going to try," Travolta, 53, told PEOPLE at a Narconon Rehab Center Fundraiser in Honolulu.
Added Preston, 44: "[We'll try] after we finish the movie we're doing together, Old Dogs, with Robin Williams and our daughter Ella. So after that!"
Travolta and Preston have two kids – Ella Bleu is 7 and son Jett is 14 – but another child has been on their mind.
"I really like having kids. I enjoy their energy and it keeps everything wonderful and hopeful," Travolta, who takes a turn in drag in the upcoming Hairspray, told PEOPLE in March. "I grew up with six kids in my family. I thought I would have five or six."
• Reporting by KATHERINE NICHOLS
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