Star Alliance partners United and Lufthansa / Swiss Air Lines / Air Canada offer very attractive deal from France to USA. Return flights from Paris to New York are now available already for €315 and non-stop round-trip flights already for €375. This fare is already including all taxes and fees and checked bag up to 23kg.
United / Lufthansa promotion is running till 1st of March 2017. Permitted for flights departing from Europe to USA till 6th of April. then 18th of April till 18th of May or 30th of October till 14th of December 2017. Max stay 3 months. Non-stop flights are based on direct booking with carrier requiring manual search. You can refer to below travel samples if interested in this option.
Booking samples
Paris - New York for €375 (Non-stop flight, travel sample 10. - 26.3.)
Travel samples
27.2. - 13.3.
10. - 26.3.
15. - 22.3.
24. - 30.4.
6. - 13.11.
21.11. - 6.12.
Do not forget you need US visa or ESTA certification before you depart to America. To book your accommodation in New York you can use Booking.com.