Denver International in September 2024

83.3%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 2024, reporting carriers scheduled 26,146 domestic departures from Denver International (DEN). 83.3% left less than 15 minutes late and 84.4% reached their destination on time; 0.2% were cancelled.

Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so DEN departures were 1.1 points below the national departure figure.

A year earlier, in September 2023, the airport had 24,738 departures with 77.0% leaving on time: a change of +6.3 points, with flights up 6%.

Flights arriving at DEN that month were on time 86.9% of the time (26,144 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 42%, air carrier 41% and national aviation system 14%.

On time 84.4%
Arrived 15+ minutes late 15.2%
Cancelled 0.2%
Diverted 0.1%

Every scheduled departure from DEN in September 2024, judged by arrival at the destination.

September 2024 against a year earlier, the airport's year and the nation

Measure	Sep 2024	Sep 2023	DEN, 12 months to Jul 2026	All reported flights, Sep 2024
Departed on time	83.3%	77.0%	75.7%	84.4%
Arrived on time	84.4%	77.9%	76.1%	83.9%
Cancelled	0.2%	0.5%	0.7%	0.6%
Average departure delay (late minutes only)	10.5 min	13.9 min	16.5 min	10.6 min
Scheduled departures a day	872	825	875	19,421
Scheduled departures	26,146	24,738	319,208	582,622

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	8,637	33%	84.8%	0.6 min	0.3%
WN Southwest Airlines	7,594	29%	83.9%	1.3 min	0.2%
OO SkyWest Airlines	5,556	21%	85.1%	1.1 min	0.1%
F9 Frontier Airlines	2,282	9%	83.0%	1.0 min	0.3%
DL Delta Air Lines	1,001	4%	88.4%	-2.3 min	0.0%
AA American Airlines	672	3%	82.3%	7.7 min	0.4%
AS Alaska Airlines	237	1%	82.3%	3.1 min	0.0%
B6 JetBlue Airways	120	0%	70.8%	31.4 min	0.0%
G4 Allegiant Air	45	0%	75.6%	6.3 min	2.2%
MQ Envoy Air	2	0%	100.0%	-15.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DEN–PHX	Denver to Phoenix	749	84.1%	1.4 min	0.4%
DEN–LAX	Denver to Los Angeles	668	88.3%	-2.8 min	0.0%
DEN–SLC	Denver to Salt Lake City	648	86.4%	-0.6 min	0.0%
DEN–LAS	Denver to Las Vegas	634	80.8%	5.2 min	0.0%
DEN–SEA	Denver to Seattle	606	81.0%	3.2 min	0.0%
DEN–ORD	Denver to Chicago	562	84.5%	0.6 min	0.2%
DEN–MSP	Denver to Minneapolis	538	84.4%	-0.7 min	0.0%
DEN–DFW	Denver to Dallas/Fort Worth	523	82.6%	2.9 min	0.0%
DEN–ATL	Denver to Atlanta	493	83.6%	2.8 min	0.2%
DEN–SFO	Denver to San Francisco	485	82.1%	0.7 min	0.2%
DEN–SAN	Denver to San Diego	459	83.9%	1.2 min	0.0%
DEN–COS	Denver to Colorado Springs	429	83.0%	2.8 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), September 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2024	Minutes
Air carrier	41.1%	38.6%	91,754
Late-arriving aircraft	42.4%	38.4%	94,761
National Aviation System	13.8%	18.2%	30,839
Extreme weather	2.6%	4.8%	5,866
Security	0.1%	0.1%	196

223,416 delay minutes on 3,978 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 September 2024?

83.3% of 26,146 scheduled domestic departures left less than 15 minutes late, and 84.4% reached their destination on time. The national figures that month were 84.4% and 83.9%.

How does that compare with a year earlier?

In September 2023, 77.0% of 24,738 departures left on time and 0.5% were cancelled, against 83.3% and 0.2% in September 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2024; 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.