UA/CO: BWI-EWR-LAS $215 ai (3.9cpm)
Not very much availability - mostly end of February/early March.
Sample Dates:
March 5 - 7
BWI-EWR-LAS-EWR-BWI
5442 miles for elite mileage plus members. For non-elites who are not eligible for 500 mile minimum on BWI-EWR segments it's less of a mileage run. Also note that BWI-EWR is a turbo-prop.
You can also do this route same dates through IAH on 737's for 4904 miles and $212.