Intro fares begin at $175 one-way, with return fares priced slightly higher. You'll have more luck finding those $175 seats for travel in late summer/fall.
Seen below, we found seats from Los Angeles for $422 round-trip, departing LAX on Tuesday, September 6, returning from CDG on Tuesday, September 13.
This fare includes carry-on baggage only, weighing no more than 10kg/22lbs, so pack light or pay up. Should you prefer to check luggage, Norwegian's LowFare+ for these dates is $602 round-trip, which includes one checked bag weighing no more than 20kg/44lbs.