BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
MIA→BOS

Miami, FL (MIA) to Boston, MA (BOS) flight delay odds

67.9% of 3,415 official scheduled MIA-to-BOS flights arrived on time; 21.5% arrived at least 30 minutes late and 2.4% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALVariable
67.9%arrived on time
21.5%30+ min late
2.4%cancelled
3,415scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late12.1%all scheduled flights
120+ minutes late4.3%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+15.0 mincompleted flights

Which departure time was most reliable for MIA to BOS?

Among qualifying MIA-to-BOS departure window results, Early morning had the highest on-time rate: 87.4% of 685 flights. Evening was lowest at 57.5% across 1,123 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning68587.4%5.4%2.0%
Late morning73773.4%17.0%1.9%
Afternoon50862.2%28.0%2.4%
Evening1,12357.5%29.7%2.9%
Night36259.7%26.2%2.5%

Which weekday was most reliable for MIA to BOS?

Among qualifying MIA-to-BOS weekday results, Saturday had the highest on-time rate: 73.4% of 488 flights. Sunday was lowest at 60.8% across 497 flights.

DayFlightsOn time30+ minCancelled
Monday49362.5%22.3%6.3%
Tuesday48570.7%18.6%2.5%
Wednesday47472.4%18.6%0.8%
Thursday49169.7%23.2%0.2%
Friday48766.1%21.8%1.2%
Saturday48873.4%17.6%1.6%
Sunday49760.8%28.0%4.0%

Which airline was most reliable for MIA to BOS?

Among qualifying MIA-to-BOS airline results, American Airlines had the highest on-time rate: 69.4% of 2,230 flights. Spirit Airlines was lowest at 50.5% across 186 flights.

AirlineFlightsOn time30+ minCancelled
American Airlines2,23069.4%20.8%1.7%
Delta Air Lines88867.8%21.2%2.9%
Spirit Airlines18650.5%32.3%6.5%
JetBlue Airways8962.9%21.3%5.6%
Republic Airways2181.0%14.3%0.0%
Envoy Air1100.0%0.0%0.0%

Which month was most reliable for MIA to BOS?

Among qualifying MIA-to-BOS month results, May 2026 had the highest on-time rate: 77.1% of 280 flights. October 2025 was lowest at 56.4% across 250 flights.

MonthFlightsOn time30+ minCancelled
July 202530257.0%30.5%4.6%
August 202528769.7%20.9%0.7%
September 202522464.7%23.2%0.0%
October 202525056.4%34.0%0.4%
November 202525774.3%16.7%2.3%
December 202527672.8%18.8%2.2%
January 202630571.5%15.4%7.2%
February 202631267.6%16.3%7.1%
March 202632561.5%27.4%2.2%
April 202633368.8%20.7%0.3%
May 202628077.1%15.0%0.4%
June 202626473.5%19.3%0.0%

What drove MIA to BOS delay minutes?

Late aircraft was the largest recorded MIA-to-BOS delay category, accounting for 41.0% of 73,512 BTS-attributed delay minutes during July 2025–June 2026.

Airline32.3%
Late aircraft41.0%
National airspace23.5%
Weather3.2%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.