Dutton made his end of the season debut at the ISU World Single Distances Championship, finishing in 8th place for the 500 meter sprint.
[6][7][failed verification] In the February 2009 Canadian Junior Championship at the Richmond Olympic Oval, Dutton placed third in the combined 500- and second in the 1000-meter sprints.
He qualified for the Canadian World Cup team for the first time and skated in the 500 and 1000 meter sprints at the Thialf in Heerenveen Netherlands on November 12 and 14.
[15] At the 2013 Canadian Fall World Cup trials, William Dutton placed second at 500 and 1000 meters, posting personal best times at both distances.
[17] The next day, when he raced Dimitri Lobkov, he sustained cuts to his right leg (requiring 12 stitches) in a fall in the last turn of the Men's A group 1000 and was carried off the ice on a stretcher.
[22] Dutton returned to Canada and missed the Canadian Single Distance Championship and Winter World Cup trials due to a groin injury.
With some help from his friend Canadian Olympic and World Cup short track speed skater Francois Hamelin, Dutton was able to sign up for the Crashed Ice racing in Minneapolis, Finland and Edmonton.
[24] Dutton hiked British Columbia's famous the West Coast Trail in June and made a decision to retire from speed skating making an official announcement that month.
[26] On November 13, 2015, almost exactly one year to the day Dutton was informed of his uncle Stephen's sudden and tragic death, he won his first World Cup medal.
Dutton would have qualified for the 2018 Olympic Team, had Speed Skating Canada not used selection criteria that included the times of, then, banned Russian athletes.
[27] Dutton appealed the inclusion of the banned Russian athletes to the Sport Dispute Resolution Centre of Canada, and in a rare decision,[28] was successful in having the Olympic nominations reconsidered.