2017 brought about a number of podium places, including the silver medal at the Rotterdam World Triathlon Series Grand Final, and he continued to mine similar success through 2018. His second place in the inaugural WTS Bermuda was made all the more remarkable as, along with Casper Stornes and Gustav Iden, Blummenfelt was part of the first ever clean sweep of a WTS podium by a national team. Silvers also followed in Montreal and Edmonton, then a year of highs and lows for Kristian in 2019 finished in the best possible way; gold at the Grand Final in Lausanne.
- 1st at the 2019 World Triathlon Grand Final Lausanne
- 5th at the 2018 Gold Coast World Triathlon Series Grand Final
- 2nd place at the 2018 ITU World Triathlon Montréal
- 2nd place at the 2018 ITU World Triathlon Edmonton
- 2nd place at the 2018 ITU World Triathlon Bermuda
- 2nd place at the 2017 ITU World Triathlon Stockholm
- Winner at the 2016 Cagliari ITU Triathlon World Cup
- Winner at the 2016 Montreal ITU Triathlon World Cup.