San Diego (SAN) to Washington (WAS): 2,248 miles (3,618 km) great-circle, about 5h 00m nonstop by our estimate. Cheapest fare observed: $152 round-trip on Frontier, with 1 stop, departing April 27, 2026.
$152 round-trip, Frontier F91426, departing 2026-04-27 at 06:25, returning 2026-05-02. The recorded itinerary left on a Monday, returning on a Saturday 5 nights later; the fare was observed 2 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $152, it ranked 5th of the 30 round-trip fares we recorded from SAN (median $279). That is 6.8 cents per great-circle mile (round-trip price over one-way distance), below the SAN median of 15.0 cents across 30 round-trip routes.
Routes from SAN of similar length: Raleigh-Durham (2,189 mi) at $288 and Toronto (2,153 mi) at $370.
Frontier had the cheapest fare on 16 of 30 SAN routes. It is the 12th longest of the 30 routes we track from SAN.
Of 19 departure airports with a fare to Washington, San Diego (SAN) ranked 3rd at $152. Lowest: $87 from Atlanta (ATL); highest: $572 from Los Angeles (LAX); 6 nonstop. Cheapest-fare airlines (routes): Frontier (10), United Airlines (3), American Airlines (2), Alaska Airlines (1), Copa (1) and Southwest (1), plus 1 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, America/New_York; flight time is our estimate.