Southwest has round-trip flights from Los Angeles (LAX) to Baltimore (BWI) starting at $162, NONSTOP. $81 each-way. Flights from January to February. A few weekends available. Origin/Destination reversible.
Note: United, Spirit, and Frontier may have fee encumbered “Basic Economy” fares available for a bit less. Keep in mind that those “cheaper” fares are often more expensive once you factor in bag fees.
Note: You can save an additional $100 if you purchase your Flight+Hotel together as a package on Southwest Vacations and use the DOM100 coupon code.