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Route Reliability

St. Louis → Raleigh–Durham

STL–RDU · 668 miles · St. Louis Lambert International Airport to Raleigh–Durham International Airport

90
Nerd Approved
WanderNerd Reliability Score
83%
Arrive within 15 minutes
5 min
Average arrival delay
0.2%
Cancelled
648
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 83% of the time across 648 flights. No comparison to make.

What the data says

Morning-you made the right choice.

STL–RDU flights departing between 6–9 AM arrived on time 93% of the time, versus 71% between 6–9 PM.

Sunday scaries are real for this one.

STL–RDU flights arrived on time 93% of the time on Wednesdays and just 71% on Sundays. That gap is worth planning around.

It basically never cancels.

Out of 648 scheduled flights, only 0.2% were cancelled.

Recent months have been rougher.

STL–RDU flights arrived on time 83% of the time over the last three months in the data, compared with 92% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon83%(97 flights)
  • Tue88%(95 flights)
  • Wed93%(95 flights)
  • Thu80%(97 flights)
  • Fri86%(100 flights)
  • Sat75%(65 flights)
  • Sun71%(98 flights)
On-time by departure window
  • 6–9 AM93%(227 flights)
  • 9 AM–12 PM91%(108 flights)
  • 12–3 PM77%(13 flights)
  • 3–6 PM82%(22 flights)
  • 6–9 PM71%(277 flights)
On-time trend by month
86%
May

Jun 71% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%56
July 202579%58
August 202589%53
September 202585%52
October 202576%58
November 202579%58
December 202585%60
January 202694%31
February 202697%34
March 202676%59
April 202686%63
May 202686%65

Keep nerding

Based on 648 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.