Washington DC (IAD) to Los Angeles (LAX): 2,283 miles (3,674 km) great-circle, about 5h 05m nonstop by our estimate. Cheapest fare observed: $266 round-trip on Frontier, with 1 stop, departing June 21, 2026.
$266 round-trip, Frontier F94277, departing 2026-06-21 at 09:55, returning 2026-08-14. The recorded itinerary left on a Sunday, returning on a Friday 54 nights later; the fare was observed 57 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $266, it ranked 8th of the 30 round-trip fares we recorded from IAD (median $775). That is 11.7 cents per great-circle mile (round-trip price over one-way distance), below the IAD median of 22.5 cents across 30 round-trip routes.
Routes from IAD of similar length: San Diego (2,248 mi) at $563 and San Salvador (1,899 mi) at $275.
Frontier had the cheapest fare on 8 of 30 IAD routes. It is the 17th longest of the 30 routes we track from IAD.
Of 40 departure airports with a fare to Los Angeles, Washington DC (IAD) ranked 24th at $266. Lowest: $77 from Seattle (SEA); highest: $1224 from Sapporo (CTS); 11 nonstop. Cheapest-fare airlines (routes): Frontier (18), Spirit (5), Southwest (3), EVA Air (2), Fiji Airways (2) and WestJet (2), plus 8 more.
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.