Washington DC (IAD) to San Diego (SAN): 2,248 miles (3,618 km) great-circle, about 5h 00m nonstop by our estimate. Cheapest fare observed: $563 round-trip on Alaska Airlines, with 1 stop, departing April 28, 2026.
$563 round-trip, Alaska Airlines AS375, departing 2026-04-28 at 09:00, 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 $563, it ranked 12th of the 30 round-trip fares we recorded from IAD (median $775). That is 25.0 cents per great-circle mile (round-trip price over one-way distance), above the IAD median of 22.5 cents across 30 round-trip routes.
Routes from IAD of similar length: Los Angeles (2,283 mi) at $266 and San Salvador (1,899 mi) at $275.
IAD to SAN is the only one of 30 IAD routes where Alaska Airlines priced cheapest. It is the 18th longest of the 30 routes we track from IAD.
Of 11 departure airports with a fare to San Diego, Washington DC (IAD) ranked 11th at $563. 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.