Hartsfield-Jackson Atlanta International in September 2025

86.6%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 25,839 domestic departures from Hartsfield-Jackson Atlanta International (ATL). 86.6% left less than 15 minutes late and 86.3% reached their destination on time; 0.1% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so ATL departures were 3.5 points above the national departure figure.

A year earlier, in September 2024, the airport had 28,247 departures with 83.7% leaving on time: a change of +2.9 points, with flights down 9%.

Flights arriving at ATL that month were on time 90.1% of the time (25,850 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 52%, national aviation system 24% and late-arriving aircraft 23%.

On time 86.3%
Arrived 15+ minutes late 13.4%
Cancelled 0.1%
Diverted 0.2%

Every scheduled departure from ATL 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	ATL, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	86.6%	83.7%	77.1%	83.1%
Arrived on time	86.3%	83.5%	76.6%	82.8%
Cancelled	0.1%	0.8%	1.8%	0.5%
Average departure delay (late minutes only)	8.2 min	10.6 min	15.1 min	12.2 min
Scheduled departures a day	861	942	865	18,748
Scheduled departures	25,839	28,247	315,859	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
DL Delta Air Lines	19,675	76%	87.0%	-0.9 min	0.0%
WN Southwest Airlines	1,594	6%	85.7%	0.3 min	0.0%
F9 Frontier Airlines	1,369	5%	78.2%	6.8 min	0.0%
UA United Airlines	637	2%	87.0%	-0.7 min	0.5%
OO SkyWest Airlines	610	2%	89.0%	1.3 min	0.3%
AA American Airlines	536	2%	83.2%	1.8 min	1.3%
NK Spirit Airlines	529	2%	88.3%	-1.0 min	0.2%
YX Republic Airline	283	1%	84.5%	1.8 min	0.4%
OH PSA Airlines	262	1%	85.9%	-6.3 min	1.1%
B6 JetBlue Airways	168	1%	70.2%	23.8 min	1.2%
AS Alaska Airlines	141	1%	88.7%	-6.7 min	0.0%
MQ Envoy Air	35	0%	74.3%	4.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ATL–LGA	Atlanta to New York	744	86.6%	-1.5 min	0.1%
ATL–DCA	Atlanta to Washington	592	79.7%	0.8 min	0.3%
ATL–MCO	Atlanta to Orlando	563	79.2%	5.4 min	0.0%
ATL–DFW	Atlanta to Dallas/Fort Worth	544	80.3%	6.7 min	1.1%
ATL–ORD	Atlanta to Chicago	541	84.3%	0.4 min	0.2%
ATL–EWR	Atlanta to Newark	520	82.9%	6.5 min	0.2%
ATL–BWI	Atlanta to Baltimore	465	87.5%	-1.5 min	0.0%
ATL–LAX	Atlanta to Los Angeles	455	82.6%	7.2 min	0.0%
ATL–FLL	Atlanta to Fort Lauderdale	453	84.5%	1.8 min	0.0%
ATL–DEN	Atlanta to Denver	450	81.1%	4.0 min	0.2%
ATL–PHL	Atlanta to Philadelphia	436	83.7%	-1.5 min	0.5%
ATL–TPA	Atlanta to Tampa	433	82.0%	3.7 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 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	51.5%	34.3%	97,013
Late-arriving aircraft	23.0%	37.4%	43,426
National Aviation System	24.2%	22.6%	45,671
Extreme weather	1.0%	5.6%	1,951
Security	0.3%	0.1%	484

188,545 delay minutes on 3,471 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 ATL on time in September 2025?

86.6% of 25,839 scheduled domestic departures left less than 15 minutes late, and 86.3% 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, 83.7% of 28,247 departures left on time and 0.8% were cancelled, against 86.6% and 0.1% 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 ATL · methodology · corrections.