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St. Louis Lambert International Airport (STL) delays and on-time record

St Louis, Missouri KSTL #35 US airport by passengers

Live airport-wide delay programs from the FAA, the weather that causes them, and how each airline has actually performed at STL.

FAA status
No delays reported Updated 3 min ago
Weather now
VFR 58°F Observed 2 h ago
Late departures
30.7%May 2026 to July 2026
Security line
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FAA delay status for STL

The FAA is not reporting a ground stop, ground delay program or other delay at STL right now.

Source: FAA National Airspace System Status, checked 3 min ago. Airline-specific delays are not shown here.

Current conditions at STL

VFR

58°F14°C

Good visibility and high cloud base. Normal operations are typical.

Wind
090° 5 mph
Visibility
10+ mi
Clouds
FEW 25,000 ft
Ceiling
None
Pressure
30.06 inHg

METARMETAR KSTL 101151Z COR 09004KT 10SM FEW250 14/09 A3006 RMK AO2 SLP171 T01440094 10211 20133 53010 $

Source: NOAA Aviation Weather Center. Observed 2 h ago.

On-time performance at STL

Based on 16,563 departures from May 2026 to July 2026. A flight counts as late when it leaves 15 or more minutes after schedule.

30.7%Departures late
25.6%Arrivals late
1.29%Cancelled
21.7 minAverage departure delay
On-time performance by airline at STL
AirlineDeparturesLateCancelled
Southwest Airlines 10,075 37.1% 0.50%
American Airlines 1,625 22.1% 2.40%
Delta Air Lines 1,482 13.6% 1.35%
United Airlines 741 25.2% 1.75%
Republic Airways 688 20.5% 5.96%
SkyWest Airlines 521 24.0% 1.92%
Frontier Airlines 413 30.5% 2.18%
Envoy Air 385 16.4% 2.86%
Alaska Airlines 343 18.1% 0.87%
PSA Airlines 290 29.3% 4.83%

Source: Bureau of Transportation Statistics, On-Time Performance of reporting carriers. Smaller regional carriers and some airlines are not included.

Late departures by month

AprMayJunJul

How delays work at STL

A ground stop holds flights bound for STL at their origin airports. A ground delay program spaces arrivals out so the airport is not overloaded. Departure and arrival delay messages describe the average wait the FAA expects. None of these tell you whether your own flight is late, so always check your airline as well.

Local tips

  • Terminal 2 is open around the clock and has armrest-free couches in the gate areas, which makes it the easier overnight choice.
  • Food is thinner in Terminal 2 than in Terminal 1, so eat before security if you land late.
  • The information booth in Terminal 1 baggage claim is open from 7 a.m. to 11 p.m. daily, for paging and local directions.
  • Visitors can walk around the terminal areas to observe, but they cannot enter the concourses or gate areas.