United Airlines is the only one of the big three airlines with a fare similar to Frontier Airlines and Spirit Airlines on the Los Angeles to Atlanta route with $107 fares Tuesday, Wednesday and some Saturdays from January to March 2016. There are plenty of dates on other days of the week with low Frontier and Spirit Airlines fares from $94 to $114 one way for a mix and match low round trip fare.
United Airlines Los Angeles LAX – San Francisco SFO – Atlanta ATL – Washington DC IAD – Los Angeles LAX
$213.20 round trip Saturday February 13 – Wednesday February 17
United Airlines LAX-IAH-MEM-ORD-LAX
$188.70 round trip Tuesday February 16 – Tuesday February 23
United Airlines Los Angeles LAX – Houston IAH – Baltimore BWI
$203.20 round trip Tuesday May 17 – Tuesday May 24
This is a good fare for connecting to a WOW Iceland flight from BWI.
This LAX-BWI route has low fare dates most days in January and February, then Tuesday, Wednesday and some Saturdays into May 2016.