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

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

Historically, 70.3% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 707 flights.

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

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

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

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

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%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 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%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

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 reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

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.