Washington DC (IAD) to San Salvador (SAL): 1,899 miles (3,056 km) great-circle, about 4h 20m nonstop by our estimate. Cheapest fare observed: $275 round-trip on United Airlines, with 1 stop, departing April 25, 2026.
$275 round-trip, United Airlines UA2437, departing 2026-04-25 at 22:11, returning 2026-05-11. The recorded itinerary left on a Saturday, returning on a Monday 16 nights later; the fare was observed 0 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $275, it ranked 10th of the 30 round-trip fares we recorded from IAD (median $775). That is 14.5 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: Guatemala City (1,862 mi) at $629 and San Juan (1,574 mi) at $632.
United Airlines had the cheapest fare on 4 of 30 IAD routes. It is the 19th longest of the 30 routes we track from IAD.
Of 13 departure airports with a fare to San Salvador, Washington DC (IAD) ranked 4th at $275. Lowest: $241 from Los Angeles (LAX); highest: $603 from Atlanta (ATL); 4 nonstop. Cheapest-fare airlines (routes): United Airlines (7), Avianca (4), American Airlines (1) and Copa (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, America/El_Salvador; flight time is our estimate.