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

Denver, CO (DEN) to St. Louis, MO (STL) flight delay odds

77.6% of 3,662 official scheduled DEN-to-STL flights arrived on time; 13.9% arrived at least 30 minutes late and 0.4% 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
77.6%arrived on time
13.9%30+ min late
0.4%cancelled
3,662scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.1%all scheduled flights
120+ minutes late2.1%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+5.9 mincompleted flights

Which departure time was most reliable for DEN to STL?

Among qualifying DEN-to-STL departure window results, Early morning had the highest on-time rate: 92.7% of 776 flights. Night was lowest at 59.6% across 47 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning77692.7%3.7%0.4%
Late morning82683.3%7.7%0.4%
Afternoon91277.2%12.9%0.1%
Evening1,10163.7%25.7%0.5%
Night4759.6%29.8%2.1%

Which weekday was most reliable for DEN to STL?

Among qualifying DEN-to-STL weekday results, Tuesday had the highest on-time rate: 82.0% of 500 flights. Sunday was lowest at 72.7% across 550 flights.

DayFlightsOn time30+ minCancelled
Monday55275.7%16.3%0.4%
Tuesday50082.0%11.4%0.2%
Wednesday52980.7%11.2%0.4%
Thursday52776.1%15.7%0.0%
Friday55977.8%13.8%0.0%
Saturday44578.4%12.1%0.7%
Sunday55072.7%16.0%1.1%

Which airline was most reliable for DEN to STL?

Among qualifying DEN-to-STL airline results, Frontier Airlines had the highest on-time rate: 85.6% of 277 flights. SkyWest Airlines was lowest at 75.9% across 141 flights.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines2,17275.9%15.0%0.4%
United Airlines1,07279.0%13.2%0.3%
Frontier Airlines27785.6%7.9%0.4%
SkyWest Airlines14175.9%12.8%0.7%

Which month was most reliable for DEN to STL?

Among qualifying DEN-to-STL month results, February 2026 had the highest on-time rate: 87.4% of 253 flights. July 2025 was lowest at 65.9% across 352 flights.

MonthFlightsOn time30+ minCancelled
July 202535265.9%23.6%0.0%
August 202532969.3%19.8%0.6%
September 202532683.4%8.6%0.0%
October 202533386.8%4.8%0.0%
November 202527482.8%9.5%0.4%
December 202526679.7%14.3%0.0%
January 202625285.3%7.5%0.8%
February 202625387.4%9.1%0.4%
March 202631876.7%14.8%0.9%
April 202628979.2%13.1%0.0%
May 202631272.8%18.6%0.0%
June 202635868.2%18.7%1.4%

What drove DEN to STL delay minutes?

Late aircraft was the largest recorded DEN-to-STL delay category, accounting for 55.3% of 46,476 BTS-attributed delay minutes during July 2025–June 2026.

Airline27.7%
Late aircraft55.3%
National airspace13.3%
Weather3.2%
Security0.4%
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.