Both sides, relegated from the Championship last season, came into the game having made solid starts to the new campaign.
Brian Barry-Murphy’s side made a promising start and enjoyed the majority of possession, but Luton had the first real chance of note with Nahki Wells firing into the side netting.
Cardiff’s response saw Callum Robinson fluff a chance from six yards out before the Republic of Ireland international tried his luck from the halfway line which Josh Keeley managed to keep out.
In an open, end-to-end game, Saville’s 20-yard strike was superbly saved by Cardiff Trott, who also denied Lasse Nordas soon after.