Baltimore/Washington International Thurgood Marshall in August 2025

74.4%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 August 2025, reporting carriers scheduled 8,381 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI). 74.4% left less than 15 minutes late and 78.0% reached their destination on time; 0.8% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so BWI departures were 2.4 points below the national departure figure.

A year earlier, in August 2024, the airport had 8,940 departures with 62.4% leaving on time: a change of +12.0 points, with flights down 6%.

Flights arriving at BWI that month were on time 78.5% of the time (8,381 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 42%, air carrier 32% and national aviation system 19%.

On time 78.0%
Arrived 15+ minutes late 20.9%
Cancelled 0.8%
Diverted 0.3%

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

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

Measure	Aug 2025	Aug 2024	BWI, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	74.4%	62.4%	71.7%	76.8%
Arrived on time	78.0%	66.3%	76.4%	76.3%
Cancelled	0.8%	2.6%	1.8%	1.1%
Average departure delay (late minutes only)	16.1 min	23.8 min	16.5 min	17.6 min
Scheduled departures a day	279	298	259	20,079
Scheduled departures	8,381	8,940	94,429	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,204	74%	78.3%	5.8 min	0.6%
DL Delta Air Lines	477	6%	84.9%	1.9 min	0.6%
NK Spirit Airlines	470	6%	77.0%	3.6 min	1.3%
UA United Airlines	372	4%	79.3%	11.8 min	0.5%
AA American Airlines	288	3%	76.4%	14.7 min	2.4%
F9 Frontier Airlines	287	3%	60.6%	25.8 min	1.7%
YX Republic Airline	106	1%	84.9%	-5.6 min	0.9%
MQ Envoy Air	89	1%	77.5%	0.7 min	2.2%
AS Alaska Airlines	62	1%	77.4%	2.3 min	1.6%
OH PSA Airlines	15	0%	73.3%	16.2 min	0.0%
OO SkyWest Airlines	11	0%	45.5%	48.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BWI–ATL	Baltimore to Atlanta	493	77.3%	6.5 min	1.2%
BWI–MCO	Baltimore to Orlando	362	65.7%	19.1 min	0.6%
BWI–BOS	Baltimore to Boston	318	78.0%	5.3 min	1.3%
BWI–DEN	Baltimore to Denver	282	74.8%	9.1 min	0.4%
BWI–CLT	Baltimore to Charlotte	271	81.5%	6.8 min	1.1%
BWI–ORD	Baltimore to Chicago	252	74.6%	12.2 min	1.2%
BWI–FLL	Baltimore to Fort Lauderdale	244	80.7%	2.0 min	0.4%
BWI–TPA	Baltimore to Tampa	230	77.4%	5.5 min	0.9%
BWI–DTW	Baltimore to Detroit	227	84.6%	4.2 min	0.0%
BWI–MIA	Baltimore to Miami	197	66.0%	29.1 min	0.5%
BWI–MDW	Baltimore to Chicago	183	73.2%	16.3 min	0.5%
BWI–BNA	Baltimore to Nashville	173	80.3%	2.2 min	2.3%

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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	32.3%	33.1%	35,259
Late-arriving aircraft	41.9%	40.5%	45,790
National Aviation System	19.0%	19.2%	20,791
Extreme weather	6.4%	7.0%	7,001
Security	0.3%	0.1%	376

109,217 delay minutes on 1,754 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 August 2025?

74.4% of 8,381 scheduled domestic departures left less than 15 minutes late, and 78.0% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 62.4% of 8,940 departures left on time and 2.6% were cancelled, against 74.4% and 0.8% in August 2025.

Provenance

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