Oneworld Alliance airlines have Paris on sale for $279 to $300 round trip from late October through March, aside from December holiday season. Looks like the alliance is pounding Norwegian when they are down. Norwegian flies LAX to Paris nonstop with lowest fares currently around $369 round trip.
There are flight itineraries with American, British Airways, Finnair and Iberia for a choice of cities where you want to transit.
Los Angeles LAX – Dallas DFW – Paris CDG – Helsinki HEL – LAX