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

St. Louis, MO (STL) to Detroit, MI (DTW) flight delay odds

Historically, 80.8% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,905 flights.

HISTORICAL ROUTE SIGNALLower disruption
80.8%arrived on time
12.7%30+ min late
1.2%cancelled
1,905scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.8%all scheduled flights
120+ minutes late4.0%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+6.2 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
Early morning45691.4%5.3%1.8%
Late morning51281.4%12.5%0.8%
Afternoon23179.7%13.4%0.9%
Evening70673.8%17.4%1.1%

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
Monday29173.5%17.2%2.4%
Tuesday27486.5%9.1%0.4%
Wednesday26986.2%9.7%0.0%
Thursday28883.7%8.7%0.7%
Friday28578.6%14.7%2.1%
Saturday21881.2%13.8%0.5%
Sunday28076.4%15.7%1.8%

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
Delta Air Lines1,08886.6%8.8%1.7%
Southwest Airlines59373.4%16.4%0.3%
SkyWest Airlines18671.0%22.6%1.1%
Spirit Airlines3683.3%16.7%0.0%
Republic Airways20.0%50.0%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202518875.0%19.7%1.1%
August 202517585.7%8.0%0.0%
September 202514893.9%3.4%0.0%
October 202517186.5%8.8%0.6%
November 202515385.6%9.2%1.3%
December 202515675.6%15.4%3.2%
January 202612275.4%18.0%0.0%
February 202611279.5%13.4%0.0%
March 202616175.8%16.8%3.1%
April 202616786.2%6.6%0.0%
May 202617981.0%13.4%1.7%
June 202617369.4%19.7%2.3%

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.

Airline46.0%
Late aircraft39.2%
National airspace6.0%
Weather8.7%
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.