Baltimore/Washington International Thurgood Marshall in September 2023

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 September 2023, reporting carriers scheduled 8,012 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI). 72.8% left less than 15 minutes late and 74.8% reached their destination on time; 1.5% were cancelled.

Nationally that month, 80.5% of flights departed on time and 80.1% arrived on time, so BWI departures were 7.7 points below the national departure figure.

Flights arriving at BWI that month were on time 80.9% of the time (8,012 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 38%, late-arriving aircraft 34% and national aviation system 25%.

On time 74.8%
Arrived 15+ minutes late 23.5%
Cancelled 1.5%
Diverted 0.2%

Every scheduled departure from BWI in September 2023, judged by arrival at the destination.

September 2023 against a year earlier, the airport's year and the nation

Measure	Sep 2023	Year earlier	BWI, 12 months to Jul 2026	All reported flights, Sep 2023
Departed on time	72.8%	—	71.7%	80.5%
Arrived on time	74.8%	—	76.4%	80.1%
Cancelled	1.5%	—	1.8%	1.2%
Average departure delay (late minutes only)	15.3 min	—	16.5 min	14.1 min
Scheduled departures a day	267	—	259	18,978
Scheduled departures	8,012	—	94,429	569,338

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	5,905	74%	73.0%	9.7 min	1.5%
NK Spirit Airlines	485	6%	77.7%	4.4 min	1.0%
DL Delta Air Lines	421	5%	88.1%	-0.2 min	0.0%
AA American Airlines	343	4%	86.6%	-1.0 min	1.2%
UA United Airlines	326	4%	87.4%	-2.3 min	0.3%
F9 Frontier Airlines	232	3%	61.2%	24.2 min	1.7%
9E Endeavor Air	75	1%	70.7%	14.0 min	10.7%
YX Republic Airline	70	1%	60.0%	22.0 min	7.1%
AS Alaska Airlines	60	1%	83.3%	0.8 min	1.7%
B6 JetBlue Airways	60	1%	53.3%	60.4 min	5.0%
MQ Envoy Air	27	0%	85.2%	-7.3 min	0.0%
G4 Allegiant Air	8	0%	87.5%	-3.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BWI–ATL	Baltimore to Atlanta	529	80.3%	5.6 min	0.6%
BWI–MCO	Baltimore to Orlando	398	70.9%	14.7 min	1.3%
BWI–BOS	Baltimore to Boston	353	56.4%	34.1 min	3.4%
BWI–FLL	Baltimore to Fort Lauderdale	289	73.4%	8.0 min	1.4%
BWI–CLT	Baltimore to Charlotte	274	84.7%	2.6 min	1.8%
BWI–DEN	Baltimore to Denver	259	82.2%	1.8 min	0.0%
BWI–ORD	Baltimore to Chicago	255	80.8%	5.0 min	0.8%
BWI–TPA	Baltimore to Tampa	202	76.7%	4.5 min	2.0%
BWI–MIA	Baltimore to Miami	173	65.9%	17.1 min	2.9%
BWI–BNA	Baltimore to Nashville	168	74.4%	4.3 min	1.8%
BWI–MDW	Baltimore to Chicago	164	81.7%	4.8 min	1.8%
BWI–PVD	Baltimore to Providence	156	71.2%	11.5 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), September 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2023	Minutes
Air carrier	38.0%	36.4%	39,709
Late-arriving aircraft	33.8%	38.3%	35,412
National Aviation System	24.6%	19.9%	25,776
Extreme weather	3.4%	5.1%	3,583
Security	0.1%	0.2%	137

104,617 delay minutes on 1,884 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 2023?

72.8% of 8,012 scheduled domestic departures left less than 15 minutes late, and 74.8% reached their destination on time. The national figures that month were 80.5% and 80.1%.

How does that compare with a year earlier?

September 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2023; 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.