American Airlines and Virgin America both have an $86.20 round trip fare between Dallas and Washington National DCA for nonstop flight travel October to February. American Airlines has far more low fare dates, including some weekend dates in January and February than Tuesday/Wednesday-only low fares on Virgin America. You need at least a 6-day trip for VX low fares. AA flies to Dallas DFW. VX flies to Dallas Love Field DAL.
American Airlines Washington DCA – Dallas DFW nonstop
American Airlines Dallas DFW – Washington DCA nonstop
Virgin America Dallas Love Field DAL – Washington National DCA nonstop