Airlines at St. Louis Lambert International Airport (STL)

St Louis, Missouri KSTL #35 US airport by passengers

Airlines operating at STL, ranked by number of departures.

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
Airline	Departures	Late	Cancelled
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.

Airline presence

Southwest is the main carrier in Terminal 2. American, Delta, United, Alaska, Frontier, Air Canada, Sun Country and Lufthansa also serve the airport, with most of the rest from Terminal 1.