Baltimore/Washington International Thurgood Marshall in April 2026

75.5%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 April 2026, reporting carriers scheduled 8,041 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI). 75.5% left less than 15 minutes late and 79.5% reached their destination on time; 0.3% were cancelled.

Nationally that month, 79.1% of flights departed on time and 78.9% arrived on time, so BWI departures were 3.6 points below the national departure figure.

A year earlier, in April 2025, the airport had 8,107 departures with 78.5% leaving on time: a change of −3.0 points, with flights down 1%.

Flights arriving at BWI that month were on time 82.2% of the time (8,043 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 36%, air carrier 34% and national aviation system 22%.

On time 79.5%
Arrived 15+ minutes late 20.0%
Cancelled 0.3%
Diverted 0.1%

Every scheduled departure from BWI in April 2026, judged by arrival at the destination.

April 2026 against a year earlier, the airport's year and the nation

Measure	Apr 2026	Apr 2025	BWI, 12 months to Jul 2026	All reported flights, Apr 2026
Departed on time	75.5%	78.5%	71.7%	79.1%
Arrived on time	79.5%	79.7%	76.4%	78.9%
Cancelled	0.3%	0.3%	1.8%	0.9%
Average departure delay (late minutes only)	13.8 min	12.9 min	16.5 min	14.5 min
Scheduled departures a day	268	270	259	19,931
Scheduled departures	8,041	8,107	94,429	597,919

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,115	76%	79.8%	2.9 min	0.1%
DL Delta Air Lines	448	6%	89.1%	-7.7 min	1.1%
UA United Airlines	369	5%	82.1%	7.8 min	0.8%
F9 Frontier Airlines	355	4%	66.2%	14.9 min	1.7%
AA American Airlines	285	4%	80.4%	6.4 min	0.4%
NK Spirit Airlines	196	2%	68.9%	14.8 min	2.0%
YX Republic Airline	147	2%	81.0%	2.8 min	1.4%
MQ Envoy Air	88	1%	73.9%	9.5 min	2.3%
AS Alaska Airlines	37	0%	70.3%	7.4 min	0.0%
OH PSA Airlines	1	0%	100.0%	-25.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BWI–ATL	Baltimore to Atlanta	440	83.6%	-4.4 min	0.5%
BWI–MCO	Baltimore to Orlando	435	81.6%	1.2 min	0.5%
BWI–BOS	Baltimore to Boston	324	78.4%	5.4 min	0.3%
BWI–FLL	Baltimore to Fort Lauderdale	286	78.0%	5.4 min	0.3%
BWI–TPA	Baltimore to Tampa	266	77.8%	5.9 min	0.4%
BWI–ORD	Baltimore to Chicago	253	74.7%	21.4 min	3.2%
BWI–CLT	Baltimore to Charlotte	244	81.1%	2.5 min	0.4%
BWI–MIA	Baltimore to Miami	207	79.2%	5.3 min	0.5%
BWI–DEN	Baltimore to Denver	202	86.1%	-1.0 min	0.0%
BWI–DTW	Baltimore to Detroit	175	82.3%	-1.0 min	1.1%
BWI–PVD	Baltimore to Providence	159	81.1%	1.5 min	0.6%
BWI–BNA	Baltimore to Nashville	156	80.1%	2.0 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), April 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2026	Minutes
Air carrier	34.4%	33.5%	30,591
Late-arriving aircraft	36.3%	40.4%	32,277
National Aviation System	22.2%	21.0%	19,760
Extreme weather	6.6%	5.0%	5,862
Security	0.4%	0.1%	382

88,872 delay minutes on 1,612 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 April 2026?

75.5% of 8,041 scheduled domestic departures left less than 15 minutes late, and 79.5% reached their destination on time. The national figures that month were 79.1% and 78.9%.

How does that compare with a year earlier?

In April 2025, 78.5% of 8,107 departures left on time and 0.3% were cancelled, against 75.5% and 0.3% in April 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for April 2026; 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.