Boston (BOS) to Chicago (CHI): 864 miles (1,391 km) great-circle, about 2h 15m nonstop by our estimate. Cheapest fare observed: $157 round-trip on American Airlines, nonstop, departing June 15, 2026.
$157 round-trip, American Airlines AA3324, departing 2026-06-15 at 05:05, returning 2026-06-30. The recorded itinerary left on a Monday, returning on a Tuesday 15 nights later; the fare was observed 51 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $157, it ranked 3rd of the 30 round-trip fares we recorded from BOS (median $623). That is 18.2 cents per great-circle mile (round-trip price over one-way distance), close to the BOS median of 19.1 cents across 30 round-trip routes.
Routes from BOS of similar length: Atlanta (945 mi) at $170 and Jacksonville (1,011 mi) at $212.
American Airlines had the cheapest fare on 5 of 30 BOS routes. It is the 28th longest of the 30 routes we track from BOS.
Of 33 departure airports with a fare to Chicago, Boston (BOS) ranked 7th at $157. 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.