On Monday I posted a round up of low fares from Chicago to 9 cities in Europe with all three major alliances offering round trip ticket prices from $456 to $563. On Monday the round trip fare for Chicago to Paris was $550 with AA, DL and UA for Jan-March 2017 departures. Today this fare is down to $470 round trip on United and every date is available from Jan 10 to March 31. Delta/SkyTeam matches with fares in $470s/$480s, while American maintains its $550 fare.
United Airlines Chicago ORD – Paris CDG nonstop
Google Flights shows wide-open availability of Star Alliance $470 fares Jan 10 – March 31, 2017.
Delta Airlines Chicago ORD – Paris CDG nonstop