Denver International in August 2025

69.8%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 August 2025, reporting carriers scheduled 28,084 domestic departures from Denver International (DEN). 69.8% left less than 15 minutes late and 69.4% reached their destination on time; 0.7% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so DEN departures were 7.0 points below the national departure figure.

A year earlier, in August 2024, the airport had 27,334 departures with 73.1% leaving on time: a change of −3.3 points, with flights up 3%.

Flights arriving at DEN that month were on time 70.9% of the time (28,083 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 46%, air carrier 32% and national aviation system 17%.

On time 69.4%
Arrived 15+ minutes late 29.6%
Cancelled 0.7%
Diverted 0.3%

Every scheduled departure from DEN 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	DEN, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	69.8%	73.1%	75.7%	76.8%
Arrived on time	69.4%	72.4%	76.1%	76.3%
Cancelled	0.7%	0.7%	0.7%	1.1%
Average departure delay (late minutes only)	22.5 min	19.1 min	16.5 min	17.6 min
Scheduled departures a day	936	911	875	20,079
Scheduled departures	28,084	27,334	319,208	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	9,440	34%	70.5%	15.4 min	0.8%
WN Southwest Airlines	7,597	27%	65.1%	18.6 min	0.4%
OO SkyWest Airlines	6,751	24%	70.1%	17.7 min	1.0%
F9 Frontier Airlines	1,982	7%	73.0%	9.7 min	0.7%
DL Delta Air Lines	1,059	4%	79.6%	4.2 min	0.8%
AA American Airlines	777	3%	68.7%	25.7 min	1.5%
AS Alaska Airlines	253	1%	63.2%	14.2 min	0.4%
B6 JetBlue Airways	150	1%	75.3%	11.3 min	0.7%
G4 Allegiant Air	73	0%	64.4%	35.5 min	0.0%
MQ Envoy Air	2	0%	50.0%	54.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DEN–SLC	Denver to Salt Lake City	669	72.9%	13.4 min	0.7%
DEN–LAX	Denver to Los Angeles	658	76.0%	12.9 min	0.2%
DEN–SEA	Denver to Seattle	645	64.8%	15.4 min	0.6%
DEN–PHX	Denver to Phoenix	612	73.5%	14.5 min	0.7%
DEN–ORD	Denver to Chicago	600	64.2%	30.2 min	1.3%
DEN–MSP	Denver to Minneapolis	549	72.1%	11.0 min	0.0%
DEN–LAS	Denver to Las Vegas	527	68.9%	13.3 min	0.8%
DEN–DFW	Denver to Dallas/Fort Worth	514	66.1%	28.0 min	2.7%
DEN–ATL	Denver to Atlanta	495	77.2%	5.5 min	0.8%
DEN–COS	Denver to Colorado Springs	466	63.3%	24.3 min	1.1%
DEN–SFO	Denver to San Francisco	461	69.0%	15.0 min	0.2%
DEN–PDX	Denver to Portland	437	71.4%	12.6 min	0.0%

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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	31.5%	33.1%	181,575
Late-arriving aircraft	46.4%	40.5%	267,230
National Aviation System	17.4%	19.2%	99,890
Extreme weather	4.7%	7.0%	26,877
Security	0.0%	0.1%	67

575,639 delay minutes on 8,302 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 DEN on time in August 2025?

69.8% of 28,084 scheduled domestic departures left less than 15 minutes late, and 69.4% 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, 73.1% of 27,334 departures left on time and 0.7% were cancelled, against 69.8% and 0.7% 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 DEN · methodology · corrections.