St Louis Lambert International in January 2026

78.0%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 2026, reporting carriers scheduled 4,683 domestic departures from St Louis Lambert International (STL). 78.0% left less than 15 minutes late and 80.1% reached their destination on time; 3.5% were cancelled.

Nationally that month, 75.6% of flights departed on time and 75.3% arrived on time, so STL departures were 2.4 points above the national departure figure.

A year earlier, in January 2025, the airport had 4,717 departures with 76.8% leaving on time: a change of +1.2 points, with flights down 1%.

Flights arriving at STL that month were on time 81.0% of the time (4,683 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 40%, late-arriving aircraft 36% and national aviation system 18%.

On time 80.1%
Arrived 15+ minutes late 16.3%
Cancelled 3.5%
Diverted 0.2%

Every scheduled departure from STL in January 2026, judged by arrival at the destination.

January 2026 against a year earlier, the airport's year and the nation

Measure	Jan 2026	Jan 2025	STL, 12 months to Jul 2026	All reported flights, Jan 2026
Departed on time	78.0%	76.8%	74.1%	75.6%
Arrived on time	80.1%	78.2%	76.8%	75.3%
Cancelled	3.5%	6.9%	1.3%	4.7%
Average departure delay (late minutes only)	14.1 min	13.4 min	17.6 min	16.7 min
Scheduled departures a day	156	157	174	18,133
Scheduled departures	4,683	4,717	63,318	544,003

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	2,936	63%	81.9%	-0.7 min	2.1%
AA American Airlines	366	8%	77.6%	15.6 min	8.2%
DL Delta Air Lines	352	8%	84.7%	-6.4 min	3.7%
YX Republic Airline	301	6%	78.7%	-5.6 min	8.6%
OO SkyWest Airlines	205	4%	70.2%	18.2 min	1.5%
MQ Envoy Air	129	3%	72.1%	6.5 min	5.4%
OH PSA Airlines	122	3%	72.1%	20.1 min	11.5%
UA United Airlines	117	2%	77.8%	-0.7 min	3.4%
F9 Frontier Airlines	114	2%	67.5%	30.4 min	2.6%
AS Alaska Airlines	38	1%	78.9%	7.6 min	2.6%
NK Spirit Airlines	3	0%	66.7%	-9.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
STL–ATL	St. Louis to Atlanta	279	82.1%	-2.4 min	6.5%
STL–DEN	St. Louis to Denver	251	82.9%	0.4 min	0.8%
STL–LGA	St. Louis to New York	215	81.4%	-3.0 min	5.6%
STL–MCO	St. Louis to Orlando	215	80.9%	7.1 min	0.9%
STL–DCA	St. Louis to Washington	199	69.3%	17.3 min	8.5%
STL–PHX	St. Louis to Phoenix	199	82.4%	6.9 min	2.5%
STL–DFW	St. Louis to Dallas/Fort Worth	169	73.4%	9.4 min	10.1%
STL–LAS	St. Louis to Las Vegas	161	77.6%	-3.7 min	0.6%
STL–ORD	St. Louis to Chicago	156	67.9%	9.8 min	4.5%
STL–CLT	St. Louis to Charlotte	155	81.9%	6.4 min	8.4%
STL–MSP	St. Louis to Minneapolis	150	82.0%	10.6 min	0.7%
STL–DAL	St. Louis to Dallas	145	85.5%	-2.1 min	5.5%

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 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Jan 2026	Minutes
Air carrier	39.5%	37.3%	22,233
Late-arriving aircraft	36.0%	35.0%	20,256
National Aviation System	18.2%	18.0%	10,219
Extreme weather	6.3%	9.6%	3,538
Security	0.0%	0.1%	0

56,246 delay minutes on 761 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 2026?

78.0% of 4,683 scheduled domestic departures left less than 15 minutes late, and 80.1% reached their destination on time. The national figures that month were 75.6% and 75.3%.

How does that compare with a year earlier?

In January 2025, 76.8% of 4,717 departures left on time and 6.9% were cancelled, against 78.0% and 3.5% in January 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for January 2026; 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.