westjet.com doesn't show any June flights yet, but the May flights that depart LAS at 08:35 (WS1399) and arrive in NRT at 16:05+1 (WS80) have a 2:45 layover in YYC. Anything else would likely not be an official WS connecting ticket, so likely would be sold as two separate tickets with no guarantee of connection if the first flight is late.