Just found this on ITA. Not a particularly great fare, but it'll get you the miles you need, and it meets your timing requirements. You could also go to SFO on the same dates for the same price (slightly more miles) or to SFO a week later for $307.

$299.80 in US Dollars
1 adult @ $299.80
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Airport legend:
ATL: Atlanta Hartsfield-Jackson
DFW: Dallas/Fort Worth Int'l
LAX: Los Angeles Int'l

Atlanta, GA to Los Angeles, CA: 1960 miles 7 hrs 5 min
American Airlines American Airlines Flight AA323 on a MD-80 (jet) in coach class
Departs Atlanta, GA (ATL) Fri, Dec 2 7:16a 2 hrs 22 min
Arrives Dallas/Fort Worth, TX (DFW) 8:38a
Layover in Dallas/Fort Worth 1 hr 27 min
American Airlines American Airlines Flight AA2417 on a Boeing 757 (jet) in coach class
(food for purchase)
Departs Dallas/Fort Worth, TX (DFW) Fri, Dec 2 10:05a 3 hrs 16 min
Arrives Los Angeles, CA (LAX) 11:21a

Los Angeles, CA to Atlanta, GA: 1960 miles 7 hrs 14 min
American Airlines American Airlines Flight AA2434 on a Boeing 757 (jet) in coach class
(food for purchase)
Departs Los Angeles, CA (LAX) Sat, Dec 3 10:08a 2 hrs 57 min
Arrives Dallas/Fort Worth, TX (DFW) 3:05p
Layover in Dallas/Fort Worth 2 hrs 12 min
American Airlines American Airlines Flight AA1210 on a Boeing 737 (jet) in coach class
Departs Dallas/Fort Worth, TX (DFW) Sat, Dec 3 5:17p 2 hrs 5 min
Arrives Atlanta, GA (ATL) 8:22p