Des Moines International in August 2025

79.7%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 August 2025, reporting carriers scheduled 1,372 domestic departures from Des Moines International (DSM). 79.7% left less than 15 minutes late and 77.8% reached their destination on time; 1.3% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so DSM departures were 2.9 points above the national departure figure.

A year earlier, in August 2024, the airport had 1,315 departures with 79.9% leaving on time: a change of −0.2 points, with flights up 4%.

Flights arriving at DSM that month were on time 74.2% of the time (1,372 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 30%, extreme weather 29% and air carrier 25%.

On time 77.8%
Arrived 15+ minutes late 20.3%
Cancelled 1.3%
Diverted 0.5%

Every scheduled departure from DSM in August 2025, judged by arrival at the destination.

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

Measure	Aug 2025	Aug 2024	DSM, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	79.7%	79.9%	78.5%	76.8%
Arrived on time	77.8%	77.5%	77.3%	76.3%
Cancelled	1.3%	1.6%	2.5%	1.1%
Average departure delay (late minutes only)	21.2 min	17.5 min	20.8 min	17.6 min
Scheduled departures a day	46	44	43	20,079
Scheduled departures	1,372	1,315	15,584	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	278	20%	77.0%	10.9 min	2.2%
UA United Airlines	186	14%	71.5%	15.0 min	1.1%
G4 Allegiant Air	173	13%	84.4%	12.5 min	0.0%
AA American Airlines	171	12%	70.2%	30.0 min	2.3%
WN Southwest Airlines	149	11%	81.2%	6.7 min	0.0%
OH PSA Airlines	118	9%	83.1%	9.0 min	1.7%
DL Delta Air Lines	116	8%	92.2%	-8.8 min	0.0%
MQ Envoy Air	87	6%	72.4%	18.8 min	1.1%
YX Republic Airline	81	6%	74.1%	21.0 min	3.7%
F9 Frontier Airlines	13	1%	46.2%	27.8 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DSM–ORD	Des Moines to Chicago	294	69.0%	21.5 min	3.7%
DSM–DEN	Des Moines to Denver	226	73.5%	13.7 min	0.0%
DSM–DFW	Des Moines to Dallas/Fort Worth	118	70.3%	21.7 min	2.5%
DSM–ATL	Des Moines to Atlanta	116	92.2%	-8.8 min	0.0%
DSM–CLT	Des Moines to Charlotte	81	75.3%	29.1 min	0.0%
DSM–PHX	Des Moines to Phoenix	70	85.7%	5.0 min	0.0%
DSM–DCA	Des Moines to Washington	62	75.8%	7.8 min	3.2%
DSM–PHL	Des Moines to Philadelphia	62	80.6%	16.0 min	1.6%
DSM–STL	Des Moines to St. Louis	56	82.1%	5.4 min	0.0%
DSM–LAS	Des Moines to Las Vegas	50	88.0%	3.5 min	0.0%
DSM–IAH	Des Moines to Houston	31	93.5%	-6.5 min	0.0%
DSM–LGA	Des Moines to New York	26	76.9%	9.6 min	3.8%

By scheduled departure hour

100

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

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

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	24.8%	33.1%	7,019
Late-arriving aircraft	30.2%	40.5%	8,558
National Aviation System	16.2%	19.2%	4,591
Extreme weather	28.8%	7.0%	8,162
Security	0.1%	0.1%	16

28,346 delay minutes on 279 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 DSM on time in August 2025?

79.7% of 1,372 scheduled domestic departures left less than 15 minutes late, and 77.8% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 79.9% of 1,315 departures left on time and 1.6% were cancelled, against 79.7% and 1.3% in August 2025.

Provenance

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