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Route Reliability

Raleigh–Durham → St. Louis

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

91
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
1 min
Average arrival delay
0.5%
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 85% of the time across 648 flights. No comparison to make.

What the data says

Morning-you made the right choice.

RDU–STL flights departing between 6–9 AM arrived on time 96% of the time, versus 74% between 6–9 PM.

Thursdays have been rough.

RDU–STL flights arrived on time 94% of the time on Tuesdays and just 75% on Thursdays. That gap is worth planning around.

Recent months have been rougher.

RDU–STL flights arrived on time 81% of the time over the last three months in the data, compared with 89% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon86%(97 flights)
  • Tue94%(95 flights)
  • Wed87%(95 flights)
  • Thu75%(96 flights)
  • Fri83%(100 flights)
  • Sat88%(65 flights)
  • Sun85%(97 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM96%(289 flights)
  • 9 AM–12 PM91%(21 flights)
  • 12–3 PM89%(18 flights)
  • 3–6 PM89%(36 flights)
  • 6–9 PM74%(280 flights)
On-time trend by month
80%
May

Jun 86% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%56
July 202577%57
August 202585%53
September 202594%52
October 202591%58
November 202586%58
December 202587%60
January 202694%31
February 202685%34
March 202685%58
April 202678%63
May 202680%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.