Aspen Pitkin County Sardy Field in September 2025

84.5%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 September 2025, reporting carriers scheduled 550 domestic departures from Aspen Pitkin County Sardy Field (ASE). 84.5% left less than 15 minutes late and 78.4% reached their destination on time; 0.4% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so ASE departures were 1.4 points above the national departure figure.

A year earlier, in September 2024, the airport had 549 departures with 74.5% leaving on time: a change of +10.0 points, with flights up 0%.

Flights arriving at ASE that month were on time 81.1% of the time (549 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 29%, air carrier 29% and late-arriving aircraft 24%.

On time 78.4%
Arrived 15+ minutes late 21.1%
Cancelled 0.4%
Diverted 0.2%

Every scheduled departure from ASE in September 2025, judged by arrival at the destination.

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

Measure	Sep 2025	Sep 2024	ASE, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	84.5%	74.5%	66.5%	83.1%
Arrived on time	78.4%	72.3%	66.5%	82.8%
Cancelled	0.4%	0.5%	5.9%	0.5%
Average departure delay (late minutes only)	14.5 min	24.6 min	32.2 min	12.2 min
Scheduled departures a day	18	18	22	18,748
Scheduled departures	550	549	8,072	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OO SkyWest Airlines	550	100%	78.4%	7.7 min	0.4%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ASE–DEN	Aspen to Denver	226	78.3%	9.5 min	0.0%
ASE–ORD	Aspen to Chicago	90	75.6%	15.0 min	0.0%
ASE–DFW	Aspen to Dallas/Fort Worth	88	70.5%	9.4 min	2.3%
ASE–LAX	Aspen to Los Angeles	62	82.3%	0.2 min	0.0%
ASE–ATL	Aspen to Atlanta	30	93.3%	-13.1 min	0.0%
ASE–IAH	Aspen to Houston	30	76.7%	13.0 min	0.0%
ASE–SFO	Aspen to San Francisco	24	91.7%	-3.3 min	0.0%

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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	28.5%	34.3%	2,554
Late-arriving aircraft	24.4%	37.4%	2,182
National Aviation System	28.9%	22.6%	2,586
Extreme weather	18.3%	5.6%	1,635
Security	0.0%	0.1%	0

8,957 delay minutes on 116 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 ASE on time in September 2025?

84.5% of 550 scheduled domestic departures left less than 15 minutes late, and 78.4% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 74.5% of 549 departures left on time and 0.5% were cancelled, against 84.5% and 0.4% in September 2025.

Provenance

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