Tilen Bartol began his international career on August 31 and September 1, 2012 with two competitions in the Alpencup in Einsiedeln , in which he came in 34th and 50th. In March of the following year Bartol started in Oberstdorf for the first time in the FIS Cup , where he finished 71st and 74th. Further participation in competitions of the Alpine and FIS Cups followed over the next few years. By far the best result for Bartol in the Alpencup was a victory in Tschagguns, Austria . On December 27th and 28th, 2014, Tilen Bartol made his debut in Engelberg in the Continental Cup . In these competitions he reached places 44 and 56. Since then, he has made regular appearances in the FIS, Alpine and Continental Cups. At the Nordic Junior World Ski Championships 2015 in Almaty , he finished 41st in the individual.
His strongest season in the Continental Cup to date was the 2015/16 season . With tenth place in Kuopio on 23 August 2015, he achieved a top 10 position in the Continental Cup for the first time. In December 2015, Bartol achieved his best results so far in the Continental Cup in Rena, Norway, and Rovaniemi, Finland . After taking third place on the podium for the first time on December 11th in Rena, Bartol won the competition a day later in the same place. After further good jumps, Bartol was finally able to win the third competition. With it he drove his first two Continental Cup victories. In Rovaniemi, Bartol was able to jump onto the podium again after finishing tenth in the first competition with third place in the second competition. After these successes in the COC, he made his debut in the World Cup as part of the Four Hills Tournament 2015/16 . He survived the qualification in Oberstdorf and Innsbruck , but with the places 47 and 49 was not able to get any points. At the Nordic Junior World Ski Championships in 2016 in Râşnov , he finished 27th in the singles and was fifth with the Slovenian team. On March 16, 2016, he also set a new world record in jumping in for the World Cup finals in Planica . He jumped 252 meters, but could not stand the jump.
At the Slovenian Championships 2016 in Planica, Bartol won the silver medal in the team competition together with Jernej Damjan , David Krapež and Miha Kveder . At the 2017 Junior World Championships in Park City , Utah , he finished ninth in the individual competition. In the team competition on the normal hill, he won the gold medal with Žiga Jelar , Aljaž Osterc and Bor Pavlovčič ahead of Germany and Austria. In the mixed team competition he also won the gold medal together with Nika Križnar , Ema Klinec and Žiga Jelar, this time ahead of Germany and Japan. After jumping almost the entire 2016/17 season in the Continental Cup and scoring his third COC victory, he was used again in the World Cup at the end of the season . As part of the Raw Air 2017 in Oslo , he was used for the first time in team jumping and was sixth with the Slovenian team. In the individual he just missed the points as 31st. At the World Cup final in Planica, he again missed his first points in 38th place.
On August 26th and 27th, 2017 Bartol made his debut in Hakuba in the Summer Grand Prix . He finished ninth and fifth and thus achieved top ten placements right away in his first appearances. In the further course of the summer he jumped in the Continental Cup and achieved his fourth COC victory on October 1st in Klingenthal , along with other podium finishes . He took second place in the COC summer classification behind Klemens Murańka . In the 2017/18 World Cup season he was a permanent member of the Slovenian World Cup team. At the start of the World Cup in Wisła on November 19, 2017, he scored his first World Cup points with 21st place. On January 1, 2018, he finished fifth in Garmisch-Partenkirchen as part of the Four Hills Tournament 2017/18 and thus achieved his first top ten placement and also his best season result in the World Cup. At the Ski Flying World Championships 2018 in Oberstdorf he finished 39th in the individual, he was not used in the team competition. At the 2018 Winter Olympics in Pyeongchang , he was part of the five-man Slovenian squad and was used in all three competitions. In the individual competition on the normal hill he took 16th place and in the individual competition on the large hill he took 17th place. With the Slovenian team, he was fifth in the team competition on the large hill . At the World Cup final in Planica , he achieved his first podium finish in the World Cup as third in the team competition. In the overall World Cup, he finished 25th with 185 points.
In the 2019/20 World Cup season , Bartol was an integral part of the Slovenian team until jumping from the Bergiselschanze in Innsbruck as part of the Four Hills Tournament , even if he was only able to reach the points twice. Meanwhile, he was plagued by pain in his right knee, which was probably related to the injury from the previous year. So he underwent a knee arthroscopy , which forced him to end the season prematurely. He finished the season with three World Cup points.