Priestland regained the starting job for the 2014 Six Nations, but Wales won just two of the four matches in which he started, and he was dropped to the bench for the final game against Scotland. A knee injury suffered in the Scarlets' final game of the 2013–14 season meant Priestland again missed Wales' summer tour to South Africa in 2014. A groin strain for Biggar saw Priestland return to Wales action as a substitute in their 33–28 loss to Australia on 8 November, before starting the match against Fiji on 15 November; he kicked a conversion in each game, but both were in front of the posts after penalty tries. With Biggar now established as Wales' first-choice fly-half, Priestland was named among the substitutes for every match in the 2015 Six Nations, coming on just twice, against France and Italy, and playing a total of just 16 minutes of rugby. As a result of his move to Bath at the end of the 2014–15 season, ahead of the 2015 Rugby World Cup, Priestland only appeared in one warm-up match, coming off the bench in a 16–10 away win over Ireland; he was also an unused substitute for a match against Italy a week later. Despite this lack of game time, Gatland named Priestland in his squad for the tournament, even giving him the starting role in the opening match against Uruguay. Priestland kicked seven of his eight conversion attempts, leading Wales to a 54–9 win. Biggar returned to start the remaining three pool matches, as well as the quarter-final loss to South Africa, but Priestland appeared off the bench each time.