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

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

82.4% of 652 official scheduled RDU-to-STL flights arrived on time; 9.7% arrived at least 30 minutes late and 0.5% 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 SIGNALLower disruption
82.4%arrived on time
9.7%30+ min late
0.5%cancelled
652scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.1%all scheduled flights
120+ minutes late1.4%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+1.8 mincompleted flights

Which departure time was most reliable for RDU to STL?

Among qualifying RDU-to-STL departure window results, Early morning had the highest on-time rate: 94.2% of 294 flights. Evening was lowest at 70.9% across 323 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning29494.2%4.4%0.0%
Evening32370.9%14.9%0.9%

Which weekday was most reliable for RDU to STL?

Among qualifying RDU-to-STL weekday results, Tuesday had the highest on-time rate: 91.8% of 97 flights. Thursday was lowest at 73.2% across 97 flights.

DayFlightsOn time30+ minCancelled
Monday9781.4%8.2%0.0%
Tuesday9791.8%5.2%0.0%
Wednesday9586.3%9.5%0.0%
Thursday9773.2%14.4%1.0%
Friday10080.0%11.0%0.0%
Saturday6984.1%10.1%0.0%
Sunday9780.4%9.3%2.1%

Which airline was most reliable for RDU to STL?

Only Southwest Airlines met the RDU-to-STL airline threshold: 82.4% of 652 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines65282.4%9.7%0.5%

Which month was most reliable for RDU to STL?

Among qualifying RDU-to-STL month results, September 2025 had the highest on-time rate: 94.2% of 52 flights. June 2026 was lowest at 65.0% across 60 flights.

MonthFlightsOn time30+ minCancelled
July 20255875.9%17.2%1.7%
August 20255384.9%9.4%0.0%
September 20255294.2%5.8%0.0%
October 20255891.4%3.4%0.0%
November 20255886.2%10.3%0.0%
December 20256086.7%1.7%0.0%
January 20263287.5%6.2%3.1%
February 20263482.4%5.9%0.0%
March 20265983.1%6.8%1.7%
April 20266376.2%12.7%0.0%
May 20266580.0%12.3%0.0%
June 20266065.0%20.0%0.0%

What drove RDU to STL delay minutes?

Late aircraft was the largest recorded RDU-to-STL delay category, accounting for 64.8% of 5,938 BTS-attributed delay minutes during July 2025–June 2026.

Airline23.1%
Late aircraft64.8%
National airspace9.1%
Weather1.0%
Security1.9%
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.