While this isn’t a “drop everything and book now” deal, finding flights to Costa Rica on a regular day is hard to come by. Via The Flight Deal, you can book flights to Liberia, Costa Rica from Charlotte, Philadelphia, Dallas, Miami, Phoenix, and St. Louis for around $280.
These flights are on United and valid from April 27 through June 30, 2015. Unfortunately these are not direct flights, but require routing through Houston. Although some flights from Philadelphia go through Newark.
Now, while searching all city pairs, I actually saw that you can get flights from Charlotte for as low as $253 on Delta! These flights go through Atlanta, where the flight direct from Atlanta is over $800! Those close to Atlanta can decide to drive to Charlotte and fly out of there instead.
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Those in ATL could also 9K BA RT to get to CLT 🙂