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Jetblue Airways have round trip airfares travelling to and from Washington DC (DCA) and Charleston SC (CHS) for $ 97, nonstop. Jetblue’s fares are main cabin, regular economy.
Travel Availability:
Departs DCA: March 27, 31; April 2, 3, 9, 10, 16, 17, 23, 24, 30; May 1-2, 5, 7-9, 14-16, 21-22, 28-30; June 2, 4-6, 11-13
Departs CHS: March 21-22, 24, 27-29; April 4-5, 11-12, 14, 18-19, 21, 25-26, 28; May 1-3, 5, 8-10, 12, 15-17, 19, 22-24, 26, 30-31; June 6-7, 9, 12-14, 16, 20
Use those dates and plug into Priceline [priceline.com], Orbitz [orbitz.com] or JetBlue [jetblue.com] directly. Bundling hotel stay with airfare will save money.