[01/16/2019 @ 10:30 AM] Still available.
Southwest has round-trip flights from Dallas (DAL) to New York (LGA) for $128, NONSTOP. $64 each-way. Flights January to April mostly midweek. No Fridays. Origin/Destination reversible. No Holidays. Expect prices to fluctuate by about +/- $10.
Note: American is matching with fee encumbered “Basic Economy” fares. Those will cost more unless you can avoid the bag fees.
Note: You may find additional savings if you book your Flight+Hotel together as a package on Southwest Vacations.