St Louis Lambert International in January 2025

76.8%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In January 2025, reporting carriers scheduled 4,717 domestic departures from St Louis Lambert International (STL). 76.8% left less than 15 minutes late and 78.2% reached their destination on time; 6.9% were cancelled.

Nationally that month, 79.3% of flights departed on time and 78.6% arrived on time, so STL departures were 2.5 points below the national departure figure.

A year earlier, in January 2024, the airport had 4,935 departures with 71.5% leaving on time: a change of +5.3 points, with flights down 4%.

Flights arriving at STL that month were on time 77.4% of the time (4,716 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 38%, air carrier 30% and national aviation system 18%.

On time 78.2%
Arrived 15+ minutes late 14.7%
Cancelled 6.9%
Diverted 0.1%

Every scheduled departure from STL in January 2025, judged by arrival at the destination.

January 2025 against a year earlier, the airport's year and the nation

Measure	Jan 2025	Jan 2024	STL, 12 months to Jul 2026	All reported flights, Jan 2025
Departed on time	76.8%	71.5%	74.1%	79.3%
Arrived on time	78.2%	70.5%	76.8%	78.6%
Cancelled	6.9%	4.5%	1.3%	3.0%
Average departure delay (late minutes only)	13.4 min	17.8 min	17.6 min	14.0 min
Scheduled departures a day	157	165	174	17,992
Scheduled departures	4,717	4,935	63,318	539,747

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	3,015	64%	78.9%	-2.1 min	7.1%
AA American Airlines	420	9%	75.7%	11.8 min	9.8%
DL Delta Air Lines	382	8%	83.0%	2.3 min	3.1%
YX Republic Airline	294	6%	78.9%	-6.6 min	7.8%
UA United Airlines	211	4%	73.9%	6.0 min	6.2%
MQ Envoy Air	138	3%	77.5%	4.2 min	3.6%
F9 Frontier Airlines	76	2%	69.7%	16.1 min	7.9%
OO SkyWest Airlines	72	2%	68.1%	26.5 min	4.2%
OH PSA Airlines	61	1%	73.8%	-9.2 min	11.5%
AS Alaska Airlines	34	1%	76.5%	7.5 min	2.9%
NK Spirit Airlines	14	0%	57.1%	8.1 min	7.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STL–DEN	St. Louis to Denver	272	77.6%	-1.0 min	6.3%
STL–ATL	St. Louis to Atlanta	264	82.2%	0.6 min	6.8%
STL–LGA	St. Louis to New York	220	79.5%	-1.7 min	5.9%
STL–MCO	St. Louis to Orlando	197	82.2%	1.2 min	4.1%
STL–PHX	St. Louis to Phoenix	194	79.9%	4.5 min	5.7%
STL–DFW	St. Louis to Dallas/Fort Worth	187	70.6%	9.1 min	10.7%
STL–DAL	St. Louis to Dallas	176	77.3%	-4.9 min	9.7%
STL–DCA	St. Louis to Washington	175	70.3%	-1.4 min	11.4%
STL–CLT	St. Louis to Charlotte	169	78.7%	14.0 min	7.1%
STL–LAS	St. Louis to Las Vegas	153	81.0%	-7.5 min	6.5%
STL–ORD	St. Louis to Chicago	150	74.0%	5.6 min	5.3%
STL–MSP	St. Louis to Minneapolis	146	76.7%	9.1 min	3.4%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), January 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jan 2025	Minutes
Air carrier	30.0%	36.2%	15,807
Late-arriving aircraft	37.9%	34.7%	19,971
National Aviation System	17.7%	19.9%	9,322
Extreme weather	14.4%	9.1%	7,572
Security	0.1%	0.2%	67

52,739 delay minutes on 693 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left STL on time in January 2025?

76.8% of 4,717 scheduled domestic departures left less than 15 minutes late, and 78.2% reached their destination on time. The national figures that month were 79.3% and 78.6%.

How does that compare with a year earlier?

In January 2024, 71.5% of 4,935 departures left on time and 4.5% were cancelled, against 76.8% and 6.9% in January 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for January 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for STL · methodology · corrections.