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Route · RDU → STL · 2020–2025 BTS data

Raleigh/Durham to St. Louis

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), RDU to STL (Raleigh/Durham to St. Louis) ranks #3606 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

84.4%
On-time
+5.4 pts
vs US avg
58 min
Delay when late
2,356
Flights
#3606 of 4927
Corpus placement

Cancelled

0.4%

Best Month

Sep 2025 94%

Worst Month

May 2024 72%

Distance

667 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 60 8 0 0 WN
Nov 2025 58 8 0 0 WN
Oct 2025 58 5 0 0 WN
Sep 2025 52 3 0 0 WN
Aug 2025 53 8 0 0 WN
Jul 2025 58 13 1 0 WN
Jun 2025 56 8 0 0 WN
May 2025 56 7 0 1 WN
Apr 2025 57 10 0 0 WN
Mar 2025 58 10 1 1 WN
Feb 2025 36 4 0 0 WN
Jan 2025 37 6 3 0 WN
Dec 2024 60 9 0 0 WN
Nov 2024 56 5 0 0 WN
Oct 2024 58 8 0 0 WN
Sep 2024 55 4 0 0 WN
Aug 2024 59 10 0 0 WN
Jul 2024 62 13 0 3 WN
Jun 2024 59 14 0 0 WN
May 2024 58 16 0 0 WN
Apr 2024 55 11 0 0 WN
Mar 2024 48 6 0 0 WN
Jan 2024 32 6 0 0 WN
Dec 2023 39 5 0 0 WN

RDU–STL seasonal on-time pattern

Best: November (89.8%) · weakest: June (75.0%)

70%75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 84.7%

Strongest calendar month

November

89.8% on-time · ~43 flights/mo

Busiest calendar month

October

~48 flights/mo avg

Weakest calendar month

June

75.0% on-time · ~42 flights/mo

Cancellation Rate

0.4%

5 of 1,280 flights

Diversion Rate

0.4%

5 of 1,280 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

RDU - Raleigh/Durham

Full on-time, delay-cause, and seasonal performance for Raleigh/Durham, NC.

RDU on-time profile

STL - St. Louis

Full on-time, delay-cause, and seasonal performance for St. Louis, MO.

STL on-time profile

Compare the two airports

See RDU and STL side by side on delays, cancellations, and reliability.

Compare RDU vs STL

Origin-hub reliability standing

Mid-pack among RDU departures

From RDU, this corridor sits with 25 other 75–85% on-time routes out of 35 tracked departures, not the hub's reliability leaders (9 at ≥85%) and not the softest ( 1 below 75%). Destination: St. Louis · fleet on-time rank #1449 of 4927.

What the Data Says About RDU to STL

Bureau of Transportation Statistics records show Raleigh/Durham to St. Louis (RDU to STL) running a 84.4% on-time rate over 2,356 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 57.7 minutes. The 667-mile corridor is served by 1 carrier, and over the last 24 months 0.4% of 1,280 flights were cancelled, 0.4% diverted.

The monthly split is wide on this route: Sep 2025 posted the strongest performance at 94% on-time, while May 2024 came in at just 72% - a 22-point swing worth factoring into travel timing.

On the multi-year calendar, RDU–STL peaks in November at 89.8% on-time while October carries the heaviest traffic (~48 flights per month) ; the softest month is June at 75.0%, a 14.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does RDU to STL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, RDU to STL ranks #3606 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from RDU to STL? ▼
Flights from Raleigh/Durham to St. Louis have a 84.4% on-time rate based on 2,356 flights. The average delay is 57.7 minutes. The best recent month was Sep 2025 with 94% on-time.
What is the cancellation rate for RDU to STL? ▼
Over the last 24 months, 0.4% of flights on this route were cancelled (5 of 1,280 flights) and 0.4% were diverted.
How far is the flight from RDU to STL? ▼
The flight distance from Raleigh/Durham (RDU) to St. Louis (STL) is approximately 667 miles. This route is served by 1 carrier.
When is the best time to fly from RDU to STL? ▼
The best recent month for on-time performance was Sep 2025 (94% on-time). The worst was May 2024 (72% on-time). Consider booking during months with historically better performance.

Airports on this route

RDU Airport

Raleigh/Durham
STL Airport

St. Louis
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using RDU–STL data

RDU–STL runs 5.4 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare RDU and STL airport profiles: delay causes and top routes differ even on the same corridor. RDU airport
  • If your dates flex, November (89.8% on-time) beats June (75.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 84.4% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.