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

Louisville, KY (SDF) to Boston, MA (BOS) flight delay odds

70.3% of 707 official scheduled SDF-to-BOS flights arrived on time; 20.2% arrived at least 30 minutes late and 1.8% 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
70.3%arrived on time
20.2%30+ min late
1.8%cancelled
707scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late12.2%all scheduled flights
120+ minutes late3.4%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+11.1 mincompleted flights

Which departure time was most reliable for SDF to BOS?

Among qualifying SDF-to-BOS departure window results, Late morning had the highest on-time rate: 89.0% of 91 flights. Evening was lowest at 66.0% across 50 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning9189.0%3.3%3.3%
Afternoon55066.7%23.6%1.8%
Evening5066.0%20.0%0.0%

Which weekday was most reliable for SDF to BOS?

Among qualifying SDF-to-BOS weekday results, Saturday had the highest on-time rate: 86.7% of 90 flights. Sunday was lowest at 61.8% across 102 flights.

DayFlightsOn time30+ minCancelled
Monday10471.2%17.3%5.8%
Tuesday10667.9%20.8%1.9%
Wednesday10265.7%25.5%1.0%
Thursday10170.3%20.8%1.0%
Friday10270.6%17.6%0.0%
Saturday9086.7%10.0%0.0%
Sunday10261.8%28.4%2.9%

Which airline was most reliable for SDF to BOS?

Among qualifying SDF-to-BOS airline results, Republic Airways had the highest on-time rate: 74.7% of 505 flights. Envoy Air was lowest at 60.0% across 200 flights.

AirlineFlightsOn time30+ minCancelled
Republic Airways50574.7%17.0%2.4%
Envoy Air20060.0%28.0%0.5%
Delta Air Lines20.0%50.0%0.0%

Which month was most reliable for SDF to BOS?

Among qualifying SDF-to-BOS month results, December 2025 had the highest on-time rate: 84.5% of 58 flights. September 2025 was lowest at 35.0% across 60 flights.

MonthFlightsOn time30+ minCancelled
July 20256168.9%24.6%1.6%
August 20256178.7%14.8%0.0%
September 20256035.0%50.0%3.3%
October 20256150.8%39.3%1.6%
November 20255979.7%16.9%0.0%
December 20255884.5%8.6%1.7%
January 20265178.4%7.8%9.8%
February 20264975.5%4.1%6.1%
March 20266182.0%9.8%0.0%
April 20266264.5%25.8%0.0%
May 20266473.4%17.2%0.0%
June 20266075.0%18.3%0.0%

What drove SDF to BOS delay minutes?

National airspace was the largest recorded SDF-to-BOS delay category, accounting for 63.4% of 13,743 BTS-attributed delay minutes during July 2025–June 2026.

Airline13.3%
Late aircraft18.9%
National airspace63.4%
Weather4.5%
Security0.1%
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.