According to The Mirror, the actor admitted that he felt emotional after filming his final scenes on the cancelled show.
"I think over the course of eight years we've had 16 marriages and 30-something children have been born," he said. "We were like a family. So it's very hard to say goodbye."
However, Sutherland added that the show is ending at the right time.
"[Executive producer] Howard Gordon... normally halfway through the season will say, 'I've got a great idea for next year'," he explained. "And he just wasn't feeling it."
Sutherland's co-star Mary Lynn Rajskub, who plays Chloe, also admitted that she felt upset when she finished working on the programme.
"When they said, 'Cut', I don't know what I was thinking," she said. "And then they said, 'This is Mary Lynn's series wrap'. And I just looked around. The crew was surrounding me. And I just kind of burst into tears."
The series finale of 24 will air on May 24 on Fox.
> Kiefer Sutherland surprised by '24' end