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

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

75.8% of 3,417 official scheduled BOS-to-MIA flights arrived on time; 15.0% arrived at least 30 minutes late and 2.3% 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 SIGNALGenerally reliable
75.8%arrived on time
15.0%30+ min late
2.3%cancelled
3,417scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.6%all scheduled flights
120+ minutes late3.4%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+4.9 mincompleted flights

Which departure time was most reliable for BOS to MIA?

Among qualifying BOS-to-MIA departure window results, Early morning had the highest on-time rate: 88.2% of 1,464 flights. Evening was lowest at 63.1% across 604 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,46488.2%5.5%2.3%
Late morning28175.4%14.9%1.8%
Afternoon1,06766.2%23.4%1.3%
Evening60463.1%22.8%4.1%

Which weekday was most reliable for BOS to MIA?

Among qualifying BOS-to-MIA weekday results, Wednesday had the highest on-time rate: 82.1% of 476 flights. Sunday was lowest at 67.1% across 495 flights.

DayFlightsOn time30+ minCancelled
Monday49473.9%14.6%5.7%
Tuesday48577.1%14.0%2.9%
Wednesday47682.1%9.7%1.3%
Thursday48878.3%13.3%0.6%
Friday48877.3%16.4%1.0%
Saturday49175.2%17.1%1.4%
Sunday49567.1%19.4%2.8%

Which airline was most reliable for BOS to MIA?

Among qualifying BOS-to-MIA airline results, American Airlines had the highest on-time rate: 80.7% of 2,231 flights. Spirit Airlines was lowest at 50.8% across 187 flights.

AirlineFlightsOn time30+ minCancelled
American Airlines2,23180.7%11.3%1.7%
Delta Air Lines89070.1%19.2%2.7%
Spirit Airlines18750.8%35.3%5.9%
JetBlue Airways8869.3%15.9%3.4%
Republic Airways2147.6%33.3%0.0%

Which month was most reliable for BOS to MIA?

Among qualifying BOS-to-MIA month results, June 2026 had the highest on-time rate: 86.4% of 264 flights. December 2025 was lowest at 68.3% across 278 flights.

MonthFlightsOn time30+ minCancelled
July 202530169.1%20.3%4.0%
August 202528783.6%10.5%0.0%
September 202522479.0%14.7%0.4%
October 202525075.6%18.4%0.4%
November 202525977.6%15.1%2.3%
December 202527868.3%19.1%2.2%
January 202630570.2%14.4%7.2%
February 202631071.0%16.1%6.5%
March 202632576.3%12.9%2.5%
April 202633475.7%15.0%0.0%
May 202628079.3%14.6%0.4%
June 202626486.4%8.3%0.0%

What drove BOS to MIA delay minutes?

Airline was the largest recorded BOS-to-MIA delay category, accounting for 36.8% of 55,709 BTS-attributed delay minutes during July 2025–June 2026.

Airline36.8%
Late aircraft32.1%
National airspace28.9%
Weather2.2%
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.