Baltimore/Washington International Thurgood Marshall in December 2024

72.8%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 7,908 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI). 72.8% left less than 15 minutes late and 78.7% reached their destination on time; 0.3% were cancelled.

Nationally that month, 77.8% of flights departed on time and 78.1% arrived on time, so BWI departures were 5.0 points below the national departure figure.

A year earlier, in December 2023, the airport had 8,418 departures with 69.5% leaving on time: a change of +3.3 points, with flights down 6%.

Flights arriving at BWI that month were on time 82.1% of the time (7,907 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 44%, air carrier 39% and national aviation system 17%.

On time 78.7%
Arrived 15+ minutes late 20.8%
Cancelled 0.3%
Diverted 0.3%

Every scheduled departure from BWI 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	BWI, 12 months to Jul 2026	All reported flights, Dec 2024
Departed on time	72.8%	69.5%	71.7%	77.8%
Arrived on time	78.7%	77.9%	76.4%	78.1%
Cancelled	0.3%	0.6%	1.8%	0.7%
Average departure delay (late minutes only)	15.0 min	15.5 min	16.5 min	16.6 min
Scheduled departures a day	264	281	259	19,686
Scheduled departures	7,908	8,418	94,429	590,581

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	5,971	76%	77.1%	4.4 min	0.3%
NK Spirit Airlines	481	6%	80.9%	2.8 min	0.4%
DL Delta Air Lines	454	6%	87.9%	-4.6 min	0.0%
UA United Airlines	281	4%	90.0%	-5.8 min	0.0%
AA American Airlines	274	3%	81.0%	6.5 min	1.5%
F9 Frontier Airlines	242	3%	72.7%	18.9 min	0.8%
YX Republic Airline	81	1%	87.7%	4.7 min	0.0%
MQ Envoy Air	61	1%	88.5%	-14.3 min	0.0%
AS Alaska Airlines	54	1%	77.8%	-1.9 min	0.0%
OH PSA Airlines	8	0%	100.0%	-4.2 min	0.0%
G4 Allegiant Air	1	0%	100.0%	-26.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BWI–ATL	Baltimore to Atlanta	535	80.2%	3.1 min	0.2%
BWI–MCO	Baltimore to Orlando	425	79.3%	7.8 min	0.5%
BWI–BOS	Baltimore to Boston	351	82.1%	2.0 min	1.7%
BWI–FLL	Baltimore to Fort Lauderdale	289	79.6%	3.2 min	0.3%
BWI–CLT	Baltimore to Charlotte	270	79.6%	10.8 min	0.4%
BWI–TPA	Baltimore to Tampa	261	78.2%	3.9 min	0.8%
BWI–DEN	Baltimore to Denver	247	85.4%	-3.2 min	0.0%
BWI–ORD	Baltimore to Chicago	188	84.6%	0.0 min	0.0%
BWI–MIA	Baltimore to Miami	182	80.8%	3.4 min	1.1%
BWI–DTW	Baltimore to Detroit	167	82.6%	1.1 min	0.0%
BWI–DAL	Baltimore to Dallas	164	77.4%	4.0 min	0.0%
BWI–RDU	Baltimore to Raleigh/Durham	162	79.6%	7.4 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), December 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2024	Minutes
Air carrier	39.4%	34.3%	33,710
Late-arriving aircraft	43.6%	40.2%	37,378
National Aviation System	16.5%	17.8%	14,102
Extreme weather	0.5%	7.5%	411
Security	0.1%	0.2%	60

85,661 delay minutes on 1,642 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 BWI on time in December 2024?

72.8% of 7,908 scheduled domestic departures left less than 15 minutes late, and 78.7% 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, 69.5% of 8,418 departures left on time and 0.6% were cancelled, against 72.8% and 0.3% 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 BWI · methodology · corrections.