After recently expanding into Iron distance competition, Jones took second place in the 2005 Ironman World Championship, losing the lead during the run to Natascha Badmann. This was only the second time that she competed in an iron distance triathlon. Later she won the 2006 Ironman Arizona Triathlon, finishing with a time of 9:12:53, and the Ironman Triathlon in Kailua-Kona, Hawaii in 9:18:31. With this victory, Jones became the first Australian woman to win a World Ironman Championship and it made her the second Australian in history to win the event, behind 1994 Men's World Champion, Greg Welch.