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

St. Louis, MO (STL) to Kansas City, MO (MCI) flight delay odds

Historically, 74.9% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,020 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
74.9%arrived on time
14.7%30+ min late
0.3%cancelled
1,020scheduled 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 late2.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+8.7 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 morning12595.2%1.6%0.0%
Late morning23487.6%6.0%0.0%
Afternoon30074.7%15.0%0.0%
Evening16167.7%19.3%0.0%
Night20053.5%29.0%1.5%

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
Monday15368.0%20.3%0.0%
Tuesday15181.5%10.6%0.0%
Wednesday14582.1%9.7%0.0%
Thursday15174.2%15.2%0.0%
Friday15180.8%11.9%0.7%
Saturday11676.7%16.4%0.0%
Sunday15362.1%19.0%1.3%

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
Southwest Airlines1,02074.9%14.7%0.3%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20259268.5%20.7%0.0%
August 20259276.1%9.8%1.1%
September 20259084.4%8.9%0.0%
October 20258877.3%11.4%0.0%
November 20258185.2%8.6%0.0%
December 20258558.8%21.2%1.2%
January 20267080.0%14.3%0.0%
February 20267181.7%8.5%0.0%
March 20268779.3%14.9%1.1%
April 20268673.3%23.3%0.0%
May 20268873.9%11.4%0.0%
June 20269063.3%22.2%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.

Airline24.6%
Late aircraft59.3%
National airspace10.2%
Weather5.9%
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.