Primera Air has low ticket prices at $363 for Newark to Paris CDG round trip on nonstop flights. $363 is for travel in May and June and $323 in Sep-Nov. Ticket prices are $400s in August and $500s in July.
Boston to Paris has similar fares starting in July. BOS-CDG $343 round trip Sep 15-25. is even lower than EWR prices in September. Be sure to check Norwegian Airlines for potentially even lower fares for Boston-Paris on many dates.
Primera Air operates a low cost airline model with low one way fares offering only one 10kg free carry-on bag. Checked bag, seat and meal are a $90 upgrade option each way. Pricing is very similar to Norwegian.
Primera Air Newark EWR – Paris CDG – Newark EWR
Primera Air Boston BOS – Paris CDG – Boston BOS