2009-10: Luke Philp skated for the Airdrie Xtreme bantam AAA team in Alberta and was selected by Kootenay in the third round (59th overall) in the 2010 WHL Bantam Draft.
2010-11: Philp played for the UFA Bisons midget AAA team in the Alberta Midget Hockey League and played for bronze medal-winning Team Alberta at the 2010 Canada Winter Games. In 33 regular season games for the Bisons he scored 20 goals with 33 assists and 16 penalty minutes. UFA finished third in the Chrysler Division and in nine playoff games Philp scored 1 goal with 4 assists and 4 penalty minutes. He had 3 assists and 8 penalty minutes in six games for Team Alberta.
2011-12: Philp appeared in 20 WHL games with Kootenay, including three playoff games, and was named to the Alberta Junior Hockey League's all-rookie team while skating for the Canmore Eagles. He had 1 goal with 1 assist and was -3 with 2 penalty minutes in 17 regular season WHL games. The Ice finished fourth in the Central Division. Philp had no points nor penalties in limited ice time in the playoffs. In 48 games for Canmore he scored 16 goals with 30 assists and 28 penalty minutes.
2012-13: Philp was the fourth-leading scorer for Kootenay in his first full season in the WHL. He scored 20 goals with 25 assists in 66 regular season games and was +3 with 24 penalty minutes. The Ice finished fifth in the Central Division and lost to Eastern Conference champion Edmonton in the first round. Philp scored 2 goals with 1 assist and was -1 in five playoff games.
2013-14: Philp returned to Kootenay for his second season and was the third-leading scorer for the Ice behind fellow 2014 NHL Draft prospects Sam Reinhart and Jaedon Descheneau. He scored 31 goals with 46 assists and was +2 with 31 penalty minutes in 71 regular season games. Kootenay finished fourth in the Central Division and defeated Calgary in the first round before falling to Medicine Hat in a seven game, second round series. Philp scored 5 goals with 8 assists and was -7 with 17 penalty minutes in 13 playoff games. He was ranked 80th amongst North American skaters in Central Scouting's final rankings prior to the 2014 NHL Draft.