Hartsfield-Jackson Atlanta International in December 2024

77.2%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 December 2024, reporting carriers scheduled 29,014 domestic departures from Hartsfield-Jackson Atlanta International (ATL). 77.2% left less than 15 minutes late and 77.6% reached their destination on time; 0.2% were cancelled.

Nationally that month, 77.8% of flights departed on time and 78.1% arrived on time, so ATL departures were 0.6 points below the national departure figure.

A year earlier, in December 2023, the airport had 28,027 departures with 85.6% leaving on time: a change of −8.4 points, with flights up 4%.

Flights arriving at ATL that month were on time 79.7% of the time (29,005 scheduled arrivals).

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

On time 77.6%
Arrived 15+ minutes late 21.8%
Cancelled 0.2%
Diverted 0.3%

Every scheduled departure from ATL in December 2024, judged by arrival at the destination.

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

Measure	Dec 2024	Dec 2023	ATL, 12 months to Jul 2026	All reported flights, Dec 2024
Departed on time	77.2%	85.6%	77.1%	77.8%
Arrived on time	77.6%	87.0%	76.6%	78.1%
Cancelled	0.2%	0.1%	1.8%	0.7%
Average departure delay (late minutes only)	14.6 min	8.5 min	15.1 min	16.6 min
Scheduled departures a day	967	934	865	19,686
Scheduled departures	29,014	28,027	315,859	590,581

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
DL Delta Air Lines	18,688	64%	78.6%	5.2 min	0.0%
9E Endeavor Air	3,467	12%	81.3%	6.9 min	0.6%
WN Southwest Airlines	2,503	9%	80.2%	4.8 min	0.2%
F9 Frontier Airlines	1,006	3%	61.1%	23.7 min	0.7%
NK Spirit Airlines	858	3%	70.7%	14.6 min	0.7%
OO SkyWest Airlines	600	2%	66.0%	31.1 min	0.3%
AA American Airlines	537	2%	77.3%	16.1 min	1.1%
UA United Airlines	532	2%	75.4%	9.1 min	0.8%
OH PSA Airlines	298	1%	69.8%	23.2 min	0.7%
B6 JetBlue Airways	206	1%	61.7%	16.4 min	1.5%
AS Alaska Airlines	144	0%	63.9%	17.7 min	2.1%
YX Republic Airline	90	0%	83.3%	3.3 min	1.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ATL–MCO	Atlanta to Orlando	725	73.4%	12.6 min	0.1%
ATL–FLL	Atlanta to Fort Lauderdale	607	70.3%	12.7 min	0.2%
ATL–LGA	Atlanta to New York	592	76.7%	5.7 min	0.0%
ATL–MIA	Atlanta to Miami	582	69.6%	16.0 min	0.2%
ATL–DCA	Atlanta to Washington	574	72.3%	10.0 min	0.3%
ATL–TPA	Atlanta to Tampa	541	74.3%	11.5 min	0.4%
ATL–EWR	Atlanta to Newark	537	65.7%	17.2 min	0.6%
ATL–DFW	Atlanta to Dallas/Fort Worth	536	67.7%	15.3 min	1.3%
ATL–BWI	Atlanta to Baltimore	531	79.3%	6.9 min	0.4%
ATL–PHL	Atlanta to Philadelphia	512	72.3%	17.6 min	0.0%
ATL–DEN	Atlanta to Denver	488	77.9%	7.7 min	0.0%
ATL–BOS	Atlanta to Boston	472	72.2%	9.3 min	1.9%

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), December 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2024	Minutes
Air carrier	45.8%	34.3%	171,019
Late-arriving aircraft	31.8%	40.2%	118,749
National Aviation System	16.8%	17.8%	62,542
Extreme weather	5.5%	7.5%	20,696
Security	0.0%	0.2%	82

373,088 delay minutes on 6,335 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 December 2024?

77.2% of 29,014 scheduled domestic departures left less than 15 minutes late, and 77.6% reached their destination on time. The national figures that month were 77.8% and 78.1%.

How does that compare with a year earlier?

In December 2023, 85.6% of 28,027 departures left on time and 0.1% were cancelled, against 77.2% and 0.2% in December 2024.

Provenance

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