Riddle, 26, headed to Spain sitting 80 points off leader Torin Yater-Wallace of America in second.
But the 2011 world champion finished on top of the summit as he claimed his second victory of the campaign, adding to his success from Copper Mountain back in January, to finish 20 points ahead of Yater-Wallace with American David Wise finishing third on 205 points - the latter two not in action in Spain.
There was more for Canada to celebrate in the women's event as Riddle's compatriot Rosalind Groenewoud claimed victory, but it wasn't enough to wrestle the crystal globe away from Switzerland's Virginie Faivre.
This was the 23-year-old's first World Cup win of the season, having also claimed the world title back in 2011, but but Faivre finished second in Spain to keep hold of her World Cup lead.
Faivre finished the season on 312 points with Groenewoud hot on her heels in second just seven points behind, ultimately running out of events to close the gap. Japan's Ayana Onozuka finished third on 276 after finishing in the same position in Spain.
Emma Lonsdale was Great Britain's best finisher in the women's as she ended eighth to finish the season 19th, with compatriot Rowan Cheshire 15th as she completed the campaign in 24th.
Meanwhile in the men's competition, Murray Buchan of Great Britain was 20th to finish his season in 31st, while Peter Speight was 37th in Spain.
- Sports & Recreation