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

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

Historically, 76.0% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,905 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
76.0%arrived on time
15.3%30+ min late
1.0%cancelled
1,905scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.3%all scheduled flights
120+ minutes late3.3%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+6.7 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 morning64884.1%10.0%0.8%
Afternoon64175.7%14.2%1.6%
Evening53566.7%22.6%0.7%
Night4264.3%28.6%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
Monday29071.4%20.3%1.0%
Tuesday27581.5%12.7%0.0%
Wednesday26981.4%10.4%0.0%
Thursday28878.1%12.8%0.3%
Friday28570.9%20.0%1.4%
Saturday21880.7%8.7%1.4%
Sunday28069.6%20.4%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
Delta Air Lines1,08879.0%13.9%1.2%
Southwest Airlines59375.5%14.5%0.5%
SkyWest Airlines18659.7%26.9%1.6%
Spirit Airlines3683.3%13.9%0.0%
Republic Airways20.0%0.0%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202518875.0%16.5%0.5%
August 202517585.1%9.1%0.0%
September 202514891.9%5.4%0.0%
October 202517178.9%13.5%0.0%
November 202515377.8%12.4%2.0%
December 202515659.0%27.6%1.9%
January 202612265.6%21.3%1.6%
February 202611275.0%18.8%0.0%
March 202616170.2%18.6%2.5%
April 202616780.2%9.6%0.0%
May 202617977.1%16.2%1.7%
June 202617373.4%17.3%1.7%

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.

Airline50.8%
Late aircraft30.7%
National airspace12.2%
Weather6.2%
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.