Frontier Airlines, an ultra low-cost air carrier have round trip airfares travelling to and from San Diego (SAN) and Washington DC (DCA) for $ 108, making 1 stop in Denver for a few hours. On Frontier, your low airfare will take you and one small personal item from point A to point B.

Travel Availability:

Departs SAN: April 13-16, 20-24, 26-30; May 1, 4-8, 11-26
Departs DCA: April 13-14, 18-21, 23-30; May 1-5, 7-26

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