Detroit (DTW) to Boston (BOS): 631 miles (1,015 km) great-circle, about 1h 45m nonstop by our estimate. Cheapest fare observed: $292 round-trip on Spirit, with 1 stop, departing May 22, 2026.
$292 round-trip, Spirit NK165, departing 2026-05-22 at 17:42, returning 2026-05-25. The recorded itinerary left on a Friday, returning on a Monday 3 nights later; the fare was observed 27 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $292, it ranked 17th of the 30 round-trip fares we recorded from DTW (median $275). That is 46.3 cents per great-circle mile (round-trip price over one-way distance), above the DTW median of 22.2 cents across 30 round-trip routes.
Routes from DTW of similar length: Atlanta (595 mi) at $339 and Minneapolis (527 mi) at $193.
Spirit had the cheapest fare on 3 of 30 DTW routes. It is the 23rd longest of the 30 routes we track from DTW.
Of 22 departure airports with a fare to Boston, Detroit (DTW) ranked 12th at $292. Lowest: $101 from Fort Lauderdale (FLL); highest: $1271 from Nairobi (NBO); 5 nonstop. Cheapest-fare airlines (routes): American Airlines (6), Frontier (5), Spirit (4), Southwest (3), Avianca (1) and Brussels Airlines (1), plus 2 more.
The reverse, Boston (BOS) to Detroit (DTT), was $208 round-trip on Spirit, nonstop, departing June 26, 2026. Boston to Detroit flights.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/New_York, America/New_York; flight time is our estimate.