Baltimore/Washington International Thurgood Marshall in December 2025

67.1%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 2025, reporting carriers scheduled 7,863 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI). 67.1% left less than 15 minutes late and 69.3% reached their destination on time; 1.3% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so BWI departures were 4.9 points below the national departure figure.

A year earlier, in December 2024, the airport had 7,908 departures with 72.8% leaving on time: a change of −5.7 points, with flights down 1%.

Flights arriving at BWI that month were on time 75.6% of the time (7,863 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 37%, air carrier 36% and national aviation system 24%.

On time 69.3%
Arrived 15+ minutes late 29.2%
Cancelled 1.3%
Diverted 0.2%

Every scheduled departure from BWI in December 2025, judged by arrival at the destination.

December 2025 against a year earlier, the airport's year and the nation

Measure	Dec 2025	Dec 2024	BWI, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	67.1%	72.8%	71.7%	72.0%
Arrived on time	69.3%	78.7%	76.4%	71.9%
Cancelled	1.3%	0.3%	1.8%	1.5%
Average departure delay (late minutes only)	18.4 min	15.0 min	16.5 min	21.2 min
Scheduled departures a day	262	264	259	19,410
Scheduled departures	7,863	7,908	94,429	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,064	77%	69.1%	10.0 min	1.1%
DL Delta Air Lines	438	6%	75.1%	6.3 min	3.4%
UA United Airlines	317	4%	74.4%	8.6 min	0.3%
AA American Airlines	292	4%	79.1%	5.9 min	0.0%
NK Spirit Airlines	247	3%	65.2%	24.4 min	1.2%
F9 Frontier Airlines	237	3%	59.1%	36.1 min	3.8%
MQ Envoy Air	123	2%	62.6%	18.0 min	0.8%
YX Republic Airline	80	1%	76.3%	7.6 min	1.3%
AS Alaska Airlines	60	1%	31.7%	30.7 min	1.7%
OH PSA Airlines	5	0%	80.0%	-0.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BWI–ATL	Baltimore to Atlanta	433	75.8%	8.9 min	2.3%
BWI–MCO	Baltimore to Orlando	420	66.7%	20.2 min	1.4%
BWI–FLL	Baltimore to Fort Lauderdale	283	58.3%	18.2 min	2.1%
BWI–BOS	Baltimore to Boston	274	71.5%	7.7 min	1.5%
BWI–CLT	Baltimore to Charlotte	248	76.2%	10.9 min	0.0%
BWI–DEN	Baltimore to Denver	243	60.9%	15.3 min	0.8%
BWI–MIA	Baltimore to Miami	218	67.4%	10.9 min	1.8%
BWI–TPA	Baltimore to Tampa	210	68.6%	12.9 min	1.9%
BWI–ORD	Baltimore to Chicago	205	60.5%	25.1 min	2.0%
BWI–DAL	Baltimore to Dallas	165	62.4%	11.0 min	1.2%
BWI–DTW	Baltimore to Detroit	165	68.5%	12.2 min	3.0%
BWI–RDU	Baltimore to Raleigh/Durham	161	78.3%	3.7 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 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	36.2%	33.3%	44,786
Late-arriving aircraft	37.1%	41.1%	45,968
National Aviation System	23.6%	19.1%	29,190
Extreme weather	2.1%	6.4%	2,615
Security	1.0%	0.2%	1,278

123,837 delay minutes on 2,295 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 2025?

67.1% of 7,863 scheduled domestic departures left less than 15 minutes late, and 69.3% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 72.8% of 7,908 departures left on time and 0.3% were cancelled, against 67.1% and 1.3% in December 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 2025; 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.