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

St. Louis, MO (STL) to Raleigh/Durham, NC (RDU) flight delay odds

Historically, 82.4% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 652 flights.

HISTORICAL ROUTE SIGNALLower disruption
82.4%arrived on time
11.7%30+ min late
0.2%cancelled
652scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.0%all scheduled flights
120+ minutes late1.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+4.7 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 morning20294.1%2.5%0.5%
Late morning13089.2%7.7%0.0%
Evening29072.1%19.7%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
Monday9782.5%13.4%0.0%
Tuesday9789.7%4.1%0.0%
Wednesday9593.7%2.1%0.0%
Thursday9777.3%12.4%0.0%
Friday10087.0%11.0%0.0%
Saturday6975.4%17.4%0.0%
Sunday9769.1%22.7%1.0%

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 Airlines65282.4%11.7%0.2%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20255879.3%19.0%0.0%
August 20255388.7%9.4%0.0%
September 20255284.6%5.8%0.0%
October 20255874.1%15.5%0.0%
November 20255879.3%17.2%0.0%
December 20256085.0%10.0%0.0%
January 20263290.6%3.1%3.1%
February 20263497.1%0.0%0.0%
March 20265974.6%13.6%0.0%
April 20266384.1%4.8%0.0%
May 20266586.2%13.8%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.

Airline26.1%
Late aircraft66.3%
National airspace5.4%
Weather2.2%
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.