Miami (MIA) to Boston (BOS): 1,260 miles (2,028 km) great-circle, about 3h 00m nonstop by our estimate. Cheapest fare observed: $184 round-trip on Frontier, with 1 stop, departing May 13, 2026.
$184 round-trip, Frontier F94405, departing 2026-05-13 at 17:22, returning 2026-05-16. The recorded itinerary left on a Wednesday, returning on a Saturday 3 nights later; the fare was observed 18 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $184, it ranked 4th of the 30 round-trip fares we recorded from MIA (median $480). That is 14.6 cents per great-circle mile (round-trip price over one-way distance), below the MIA median of 18.9 cents across 30 round-trip routes.
Routes from MIA of similar length: Chicago (1,199 mi) at $165 and Dallas (1,120 mi) at $211.
Frontier had the cheapest fare on 7 of 30 MIA routes. It is the 18th longest of the 30 routes we track from MIA.
Of 22 departure airports with a fare to Boston, Miami (MIA) ranked 4th at $184. 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 Miami (MIA), was $203 round-trip on Frontier, 1 stop, departing June 8, 2026. Boston to Miami 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.