KSTL Runway 12R/30L — St. Louis Lambert International Airport

Oct 28, 2026 (airport-local day): 1 configuration change since local midnight, from the D-ATIS broadcasts ATIS Alerts recorded. A change is a different arrival or departure set; a new ATIS letter with the same runways is folded into the row it belongs to. The history section below counts the same way over rolling windows.

1. 05:08Z12:08 AM CDT(in effect since before the day began)

   1.7 h
   Arrivals

   12L

   Departures

   12R
   ATIS: Yankee → ZuluSoutheast flowIn effect at the start of the day
2. 06:51Z1:51 AM CDT

   2.3 h · current
   Arrivals

   12L11

   Departures

   12R
   ATIS: Alfa → BravoSoutheast flowArrivals +11

Time · runway 12R/30L · airport-wide outlook · confidence · forecast wind · why

1. Now0908Z · 4:08 AM CDT·12R/30L: 12R in use·Current airport configuration (D-ATIS): arrivals 12L · 11 · departures 12R·stated·wind 200° at 3 kt
2. +1 h1008Z · 5:08 AM CDT·12R/30L: 12R likely·airport-wide likely 12R·Southeast flow·Low 55%·wind VRB at 3 kt·Why TAF wind variable at 3 kt: no steady direction, so wind does not decide the runway.|In recorded use, 12R is the end this airport most often named for arrivals in calm wind (D-ATIS).|The airport is already using 12L and 11.
3. +2 h1108Z · 6:08 AM CDT·12R/30L: 12R likely·airport-wide likely 12R·Southeast flow·Low 55%·wind VRB at 3 kt·Why TAF wind variable at 3 kt: no steady direction, so wind does not decide the runway.|In recorded use, 12R is the end this airport most often named for arrivals in calm wind (D-ATIS).|The airport is already using 12L and 11.
4. +3 h1208Z · 7:08 AM CDT·12R/30L: 12R likely·airport-wide likely 12R·Southeast flow·Low 55%·wind VRB at 3 kt·Why TAF wind variable at 3 kt: no steady direction, so wind does not decide the runway.|In recorded use, 12R is the end this airport most often named for arrivals in calm wind (D-ATIS).|The airport is already using 12L and 11.
5. +6 h1508Z · 10:08 AM CDT·12R/30L: 12R likely·airport-wide likely 12R·Southeast flow·Low 55%·wind VRB at 3 kt·Why TAF wind variable at 3 kt: no steady direction, so wind does not decide the runway.|In recorded use, 12R is the end this airport most often named for arrivals in calm wind (D-ATIS).|The airport is already using 12L and 11.
6. +12 h2108Z · 4:08 PM CDT·12R/30L: 12R likely·airport-wide likely 12R then 11·Southeast flow·5 kt headwind, 5 kt crosswind·Low 20%·wind 170° at 7 kt·Why TAF forecast wind 170° at 7 kt favors south-facing runway ends: 5 kt headwind and 5 kt crosswind on 12R versus 5 kt headwind on 11.|The airport is already using 12L and 11 (stated by D-ATIS), so no change is needed.|No known runway closure prevents this configuration.|Recorded use with wind from the south: 12R named for arrivals 7% of 104 h (D-ATIS).|Confidence falls with forecast distance (+12 h).

ATIS Alerts Predicted Runway is an estimate from the TAF wind forecast, runway geometry (most headwind, crosswind penalised, tailwind over 5 kt avoided, longest runway breaks ties), the current stated configuration and any stated closures; recorded D-ATIS use since Sep 18, 2026 (720 h) is an input wherever a wind sector has 24 h on record. Each row lists its reasons; “no runway favored” is a genuine answer under variable or light wind, never replaced by a guess. It is not an ATC assignment and does not know about noise abatement or traffic flow unless the recorded history shows them. TAF issued 0855Z (3:55 AM CDT).

Source: FAA NASR 28-day subscription, cycle effective 2026-10-01 (equipment on record) · FAA NOTAMs via SWIM (live)and the current D-ATIS (outages). “Not available” means the FAA record lists no such equipment for the end; nothing here is inferred. An outage annotation is only ever a reading of the official text shown with it. Declared distances are not shown in this phase.

The current D-ATIS does not state LAHSO in effect. Source: FAA NASR cycle 2026-10-01; D-ATIS text read by ATIS Alerts.

Rows marked “Runway 12R/30L” are sectorized to this runway complex in the FAA record; “Airport-wide” rows serve every runway. Source: FAA NASR FRQ, cycle 2026-10-01. Verify on the current chart supplement before use.

Length

11,020 ft

Width

150 ft

Surface

Concrete · Good condition

Surface treatment

Grooved

Weight bearing (lb)

S 75k · D 200k · 2D 350k · 2D/2D2 760k

PCN

905

Runway lights

Lighted

Airport elevation

617 ft

Published FAA baseline

Open

Published NASR record; does not reflect temporary closures or restrictions. Current operational status is the card at the top of the page.

Runway 12R/30L numbers are magnetic; the stored geometry and every wind calculation on this page are TRUE north, so they never need a variation correction. Magnetic headings use the FAA's published variation for this airport, 1.0°W (2020), the same value printed on the FAA airport diagram. Surface condition, treatment, weight bearing, thresholds and traffic pattern are from the FAA NASR record (cycle 2026-10-01); lighting, ILS and LAHSO are in their own sections above. Declared distances are not shown in this phase.

Runway percentages are measured independently. Multiple runways can be active simultaneously, so totals may exceed 100%.

Observed runway usage — 720 hours of D-ATIS runway configuration history collected · 17 distinct configurations observed · 847 D-ATIS broadcasts recorded · through Oct 28, 2026. Shares are the fraction of recorded hours in which the D-ATIS named each end. Wind sectors use the wind reported when each configuration began. Nothing here is inferred from wind; the wind-favored analysis for KSTL is a separate module. 90-day, 12-month and seasonal views appear once the record is long enough.

30 departure procedures · 9 STARs · FAA hot spots page ↗ · FAA d-TPP cycle 2611. Plates open on aeronav.faa.gov (public domain); ATIS Alerts does not reproduce charts or minimums.