Washington DC (DCA) to San Diego (SAN): 2,271 miles (3,655 km) great-circle, about 5h 05m nonstop by our estimate. Cheapest fare observed: $230 round-trip on Frontier, with 1 stop, departing April 28, 2026.
$230 round-trip, Frontier F9687, departing 2026-04-28 at 13:59, returning 2026-05-01. The recorded itinerary left on a Tuesday, returning on a Friday 3 nights later; the fare was observed 3 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $230, it ranked 5th of the 30 round-trip fares we recorded from DCA (median $998). That is 10.1 cents per great-circle mile (round-trip price over one-way distance), below the DCA median of 26.4 cents across 30 round-trip routes.
Routes from DCA of similar length: Los Angeles (2,306 mi) at $245 and San Salvador (1,903 mi) at $275.
Frontier had the cheapest fare on 6 of 30 DCA routes. It is the 18th longest of the 30 routes we track from DCA.
Of 11 departure airports with a fare to San Diego, Washington DC (DCA) ranked 7th at $230. Lowest: $76 from San Francisco (SFO); highest: $563 from Washington DC (IAD); 4 nonstop. Cheapest-fare airlines (routes): Frontier (8), Alaska Airlines (2) and WestJet (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, America/Los_Angeles; flight time is our estimate.