There are many connections, and you need to add DFW-BOS or DFW-DTW, but how about these?
5/21 DL 0124 (BOS/AMS) 16:37/05:50+
5/22 AF 1241 (AMS/CDG) 09:30/10:45
5/22 AF 1832 (CDG/ATH) 12:40/16:50
6/06 DL 0477 (BCN/JFK) 09:55/12:24
6/06 DL 4034 (JFK/DFW) 18:25/21:23
160,000 miles + $81.36 per person
5/21 DL 0018 (DTW/LHR) 22:17/11:05+
5/22 AF 1581 (LHR/CDG) 12:10/14:30 COACH
5/22 AF 1032 (CDG/ATH) 19:00/23:10
6/06 DL 0477 (BCN/JFK) 09:55/12:24
6/06 DL 4034 (JFK/DFW) 18:25/21:23
160,000 miles + $101.36 per person