Baltimore/Washington International Thurgood Marshall in September 2024

79.9%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 2024, reporting carriers scheduled 8,273 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI). 79.9% left less than 15 minutes late and 82.8% reached their destination on time; 0.6% were cancelled.

Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so BWI departures were 4.5 points below the national departure figure.

A year earlier, in September 2023, the airport had 8,012 departures with 72.8% leaving on time: a change of +7.1 points, with flights up 3%.

Flights arriving at BWI that month were on time 86.0% of the time (8,272 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 45%, late-arriving aircraft 34% and national aviation system 20%.

On time 82.8%
Arrived 15+ minutes late 16.6%
Cancelled 0.6%
Diverted 0.1%

Every scheduled departure from BWI in September 2024, judged by arrival at the destination.

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

Measure	Sep 2024	Sep 2023	BWI, 12 months to Jul 2026	All reported flights, Sep 2024
Departed on time	79.9%	72.8%	71.7%	84.4%
Arrived on time	82.8%	74.8%	76.4%	83.9%
Cancelled	0.6%	1.5%	1.8%	0.6%
Average departure delay (late minutes only)	10.6 min	15.3 min	16.5 min	10.6 min
Scheduled departures a day	276	267	259	19,421
Scheduled departures	8,273	8,012	94,429	582,622

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,152	74%	82.4%	1.4 min	0.5%
NK Spirit Airlines	518	6%	83.4%	-1.6 min	1.0%
DL Delta Air Lines	454	5%	88.1%	-1.7 min	0.0%
UA United Airlines	352	4%	91.8%	-6.1 min	0.6%
AA American Airlines	331	4%	83.1%	9.4 min	0.9%
F9 Frontier Airlines	234	3%	71.4%	12.3 min	3.0%
YX Republic Airline	79	1%	83.5%	-2.5 min	0.0%
AS Alaska Airlines	59	1%	57.6%	15.4 min	1.7%
9E Endeavor Air	55	1%	87.3%	5.4 min	0.0%
MQ Envoy Air	30	0%	93.3%	-8.7 min	0.0%
G4 Allegiant Air	9	0%	55.6%	18.6 min	11.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BWI–ATL	Baltimore to Atlanta	497	84.3%	2.1 min	1.0%
BWI–MCO	Baltimore to Orlando	394	83.5%	-0.9 min	0.3%
BWI–BOS	Baltimore to Boston	359	81.1%	2.3 min	0.0%
BWI–CLT	Baltimore to Charlotte	307	77.9%	8.1 min	1.0%
BWI–FLL	Baltimore to Fort Lauderdale	287	84.0%	-0.8 min	0.3%
BWI–DEN	Baltimore to Denver	268	84.3%	-4.1 min	0.0%
BWI–TPA	Baltimore to Tampa	252	79.8%	1.0 min	5.2%
BWI–ORD	Baltimore to Chicago	224	91.1%	-4.9 min	0.0%
BWI–LAS	Baltimore to Las Vegas	195	81.5%	-0.7 min	0.0%
BWI–DTW	Baltimore to Detroit	189	79.9%	2.3 min	0.0%
BWI–MDW	Baltimore to Chicago	180	82.8%	7.7 min	0.0%
BWI–PVD	Baltimore to Providence	170	87.1%	-3.5 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 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2024	Minutes
Air carrier	45.1%	38.6%	28,888
Late-arriving aircraft	33.8%	38.4%	21,643
National Aviation System	20.1%	18.2%	12,865
Extreme weather	1.0%	4.8%	658
Security	0.0%	0.1%	0

64,054 delay minutes on 1,371 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 September 2024?

79.9% of 8,273 scheduled domestic departures left less than 15 minutes late, and 82.8% reached their destination on time. The national figures that month were 84.4% and 83.9%.

How does that compare with a year earlier?

In September 2023, 72.8% of 8,012 departures left on time and 1.5% were cancelled, against 79.9% and 0.6% in September 2024.

Provenance

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