Short turns that work for $835:

Wed. Nov. 30 - Mon. Dec. 5
Fri. Dec. 2 - Tue. Dec. 6

These dates work for $1,028 RT:

Depart Thursday Dec. 1 at 6:10 PM, return on Tuesday, Dec. 6 at 1:51 PM. Time on the ground is 57 hours.
Depart Saturday Dec. 3 at 10:05 PM, return on Friday, Dec. 9 at 03:45 PM.

Note: There are some pretty nasty layovers with all of these. Between 10 and 14 hours in Frankfurt on the way there.