Denver International in September 2023

77.0%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 September 2023, reporting carriers scheduled 24,738 domestic departures from Denver International (DEN). 77.0% left less than 15 minutes late and 77.9% reached their destination on time; 0.5% were cancelled.

Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so DEN departures were 3.5 points below the national departure figure.

Flights arriving at DEN that month were on time 82.4% of the time (24,727 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 44%, air carrier 38% and national aviation system 15%.

On time 77.9%
Arrived 15+ minutes late 21.3%
Cancelled 0.5%
Diverted 0.4%

Every scheduled departure from DEN in September 2023, judged by arrival at the destination.

September 2023 against a year earlier, the airport's year and the nation

Measure	Sep 2023	Year earlier	DEN, 12 months to Jul 2026	All reported flights, Sep 2023
Departed on time	77.0%	—	75.7%	80.5%
Arrived on time	77.9%	—	76.1%	80.1%
Cancelled	0.5%	—	0.7%	1.2%
Average departure delay (late minutes only)	13.9 min	—	16.5 min	14.1 min
Scheduled departures a day	825	—	875	18,978
Scheduled departures	24,738	—	319,208	569,338

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	8,283	33%	81.0%	3.8 min	0.4%
WN Southwest Airlines	8,022	32%	71.6%	10.2 min	0.4%
OO SkyWest Airlines	4,076	16%	82.8%	3.6 min	0.2%
F9 Frontier Airlines	2,105	9%	76.8%	8.8 min	0.9%
DL Delta Air Lines	1,023	4%	87.5%	-2.6 min	1.0%
AA American Airlines	703	3%	80.8%	3.8 min	0.6%
AS Alaska Airlines	185	1%	82.2%	-1.7 min	0.0%
B6 JetBlue Airways	164	1%	53.7%	55.0 min	2.4%
NK Spirit Airlines	134	1%	70.9%	11.2 min	3.0%
G4 Allegiant Air	43	0%	67.4%	11.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DEN–LAS	Denver to Las Vegas	790	71.6%	11.4 min	1.1%
DEN–PHX	Denver to Phoenix	711	77.6%	8.1 min	0.4%
DEN–SLC	Denver to Salt Lake City	635	81.3%	3.4 min	0.2%
DEN–SEA	Denver to Seattle	612	79.2%	1.9 min	0.0%
DEN–LAX	Denver to Los Angeles	606	83.8%	0.7 min	0.8%
DEN–MSP	Denver to Minneapolis	559	79.2%	6.2 min	0.4%
DEN–ORD	Denver to Chicago	547	83.0%	5.7 min	0.2%
DEN–ATL	Denver to Atlanta	503	85.5%	-0.2 min	0.2%
DEN–DFW	Denver to Dallas/Fort Worth	498	81.5%	3.3 min	0.4%
DEN–SFO	Denver to San Francisco	469	76.3%	8.2 min	0.4%
DEN–LGA	Denver to New York	451	67.8%	19.7 min	2.9%
DEN–SAN	Denver to San Diego	446	74.9%	7.4 min	0.4%

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 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2023	Minutes
Air carrier	38.4%	36.4%	112,211
Late-arriving aircraft	43.5%	38.3%	126,967
National Aviation System	15.4%	19.9%	44,853
Extreme weather	2.4%	5.1%	7,109
Security	0.3%	0.2%	955

292,095 delay minutes on 5,260 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 2023?

77.0% of 24,738 scheduled domestic departures left less than 15 minutes late, and 77.9% reached their destination on time. The national figures that month were 80.5% and 80.1%.

How does that compare with a year earlier?

September 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2023; 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.