Washington DC (IAD) to Chicago (CHI): 587 miles (945 km) great-circle, about 1h 40m nonstop by our estimate. Cheapest fare observed: $210 round-trip on Frontier, with 1 stop, departing June 5, 2026.
$210 round-trip, Frontier F91081, departing 2026-06-05 at 11:07, returning 2026-06-08. The recorded itinerary left on a Friday, returning on a Monday 3 nights later; the fare was observed 41 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $210, it ranked 5th of the 30 round-trip fares we recorded from IAD (median $775). That is 35.7 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: Atlanta (534 mi) at $122 and Orlando (752 mi) at $121.
Frontier had the cheapest fare on 8 of 30 IAD routes. It is the 28th longest of the 30 routes we track from IAD.
Of 33 departure airports with a fare to Chicago, Washington DC (IAD) ranked 20th at $210. Lowest: $89 from Atlanta (ATL); highest: $1241 from Nairobi (NBO); 16 nonstop. Cheapest-fare airlines (routes): Frontier (15), Spirit (5), United Airlines (4), American Airlines (2), airline 0O (1) and Alaska Airlines (1), plus 5 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, America/Chicago; flight time is our estimate.