At the 2015 UK Open, Pallett defeated Mark Dudbridge, Andy Smith and Colin Fowler to play in the fourth round of the event for the second year in a row. He faced Phil Taylor and was beaten 9–3. In September, Pallett averaged over 100 in knocking out both Jamie Caven (100.73) and Jelle Klaasen (104.83) at the European Darts Matchplay. His run continued with 6–5 wins over Alan Norris and Kim Huybrechts to reach the semi-finals of a PDC event for the first time, where he lost 6–3 to Dave Chisnall. This result was a huge factor in Pallett qualifying for his second successive World Championship, where he will play Huybrechts in the first round.