Harry Reid International in September 2025

77.3%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 2025, reporting carriers scheduled 14,399 domestic departures from Harry Reid International (LAS). 77.3% left less than 15 minutes late and 78.2% reached their destination on time; 0.5% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so LAS departures were 5.8 points below the national departure figure.

A year earlier, in September 2024, the airport had 15,672 departures with 79.5% leaving on time: a change of −2.2 points, with flights down 8%.

Flights arriving at LAS that month were on time 79.3% of the time (14,405 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 40%, air carrier 31% and national aviation system 25%.

On time 78.2%
Arrived 15+ minutes late 21.0%
Cancelled 0.5%
Diverted 0.3%

Every scheduled departure from LAS 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	LAS, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	77.3%	79.5%	73.8%	83.1%
Arrived on time	78.2%	80.4%	76.8%	82.8%
Cancelled	0.5%	0.3%	0.9%	0.5%
Average departure delay (late minutes only)	15.4 min	12.9 min	16.3 min	12.2 min
Scheduled departures a day	480	522	474	18,748
Scheduled departures	14,399	15,672	172,932	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,794	47%	76.1%	6.4 min	0.5%
NK Spirit Airlines	1,344	9%	80.2%	7.4 min	1.1%
DL Delta Air Lines	1,250	9%	84.2%	1.1 min	0.0%
UA United Airlines	1,194	8%	80.2%	1.7 min	0.2%
AA American Airlines	1,105	8%	83.0%	3.1 min	1.1%
F9 Frontier Airlines	934	6%	77.8%	6.2 min	0.7%
G4 Allegiant Air	532	4%	79.7%	5.0 min	0.0%
AS Alaska Airlines	441	3%	75.7%	4.1 min	0.5%
OO SkyWest Airlines	380	3%	75.5%	9.2 min	0.8%
B6 JetBlue Airways	275	2%	71.3%	9.6 min	1.1%
HA Hawaiian Airlines	150	1%	74.7%	25.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
LAS–LAX	Las Vegas to Los Angeles	691	77.9%	4.1 min	0.4%
LAS–SAN	Las Vegas to San Diego	610	71.6%	13.7 min	1.0%
LAS–DEN	Las Vegas to Denver	539	72.7%	11.9 min	0.2%
LAS–SFO	Las Vegas to San Francisco	513	63.0%	10.3 min	0.4%
LAS–ORD	Las Vegas to Chicago	481	77.1%	11.1 min	0.6%
LAS–SEA	Las Vegas to Seattle	441	81.9%	1.3 min	0.2%
LAS–PHX	Las Vegas to Phoenix	431	76.8%	7.4 min	2.1%
LAS–DFW	Las Vegas to Dallas/Fort Worth	423	83.2%	0.6 min	2.1%
LAS–SMF	Las Vegas to Sacramento	407	77.6%	6.3 min	0.2%
LAS–ATL	Las Vegas to Atlanta	389	88.4%	-2.6 min	0.0%
LAS–SJC	Las Vegas to San Jose	375	78.4%	4.1 min	0.8%
LAS–BUR	Las Vegas to Burbank	352	78.4%	4.6 min	0.9%

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 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	31.2%	34.3%	61,897
Late-arriving aircraft	40.3%	37.4%	79,915
National Aviation System	25.1%	22.6%	49,716
Extreme weather	3.2%	5.6%	6,408
Security	0.2%	0.1%	466

198,402 delay minutes on 3,029 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 LAS on time in September 2025?

77.3% of 14,399 scheduled domestic departures left less than 15 minutes late, and 78.2% 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, 79.5% of 15,672 departures left on time and 0.3% were cancelled, against 77.3% and 0.5% 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 LAS · methodology · corrections.