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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 6 min ago
Weather now
IFR 61°F Observed 28 min 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 6 min ago. Airline-specific delays are not shown here.

Current conditions at STL

IFR

61°F16°C

Low cloud or poor visibility. Airports slow arrivals and delays become more likely.

Wind
120° 10 mph
Visibility
8 mi
Clouds
OVC 900 ft
Ceiling
900 ft
Pressure
30.25 inHg

METARSPECI KSTL 011723Z COR 12009KT 8SM OVC009 16/14 A3025 RMK AO2 T01610144 $

Source: NOAA Aviation Weather Center. Observed 28 min 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.