Baltimore/Washington International Thurgood Marshall in May 2026

71.3%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 May 2026, reporting carriers scheduled 8,161 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI). 71.3% left less than 15 minutes late and 76.3% reached their destination on time; 0.3% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so BWI departures were 5.8 points below the national departure figure.

A year earlier, in May 2025, the airport had 8,411 departures with 70.5% leaving on time: a change of +0.8 points, with flights down 3%.

Flights arriving at BWI that month were on time 79.9% of the time (8,163 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 40%, air carrier 36% and national aviation system 21%.

On time 76.3%
Arrived 15+ minutes late 23.2%
Cancelled 0.3%
Diverted 0.2%

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

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

Measure	May 2026	May 2025	BWI, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	71.3%	70.5%	71.7%	77.1%
Arrived on time	76.3%	73.0%	76.4%	77.6%
Cancelled	0.3%	0.5%	1.8%	0.9%
Average departure delay (late minutes only)	16.8 min	19.2 min	16.5 min	16.0 min
Scheduled departures a day	272	280	259	20,391
Scheduled departures	8,161	8,411	94,429	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	6,327	78%	75.3%	7.9 min	0.1%
DL Delta Air Lines	491	6%	82.5%	2.1 min	1.4%
UA United Airlines	370	5%	79.5%	1.6 min	0.5%
F9 Frontier Airlines	339	4%	73.5%	13.0 min	0.3%
AA American Airlines	299	4%	81.9%	9.2 min	2.0%
YX Republic Airline	159	2%	85.5%	-4.3 min	0.0%
AS Alaska Airlines	77	1%	77.9%	0.0 min	0.0%
MQ Envoy Air	72	1%	72.2%	6.0 min	1.4%
OO SkyWest Airlines	15	0%	80.0%	2.1 min	0.0%
NK Spirit Airlines	8	0%	75.0%	15.6 min	0.0%
OH PSA Airlines	4	0%	50.0%	17.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
BWI–ATL	Baltimore to Atlanta	486	77.2%	6.5 min	0.8%
BWI–MCO	Baltimore to Orlando	370	84.3%	3.5 min	0.3%
BWI–BOS	Baltimore to Boston	316	74.1%	5.3 min	0.0%
BWI–ORD	Baltimore to Chicago	273	78.4%	4.4 min	0.7%
BWI–CLT	Baltimore to Charlotte	260	81.9%	9.6 min	0.4%
BWI–TPA	Baltimore to Tampa	255	76.1%	7.5 min	0.4%
BWI–FLL	Baltimore to Fort Lauderdale	214	74.8%	7.6 min	0.5%
BWI–DEN	Baltimore to Denver	208	77.9%	1.3 min	0.0%
BWI–DTW	Baltimore to Detroit	206	79.1%	5.1 min	1.9%
BWI–MIA	Baltimore to Miami	204	76.5%	4.6 min	0.5%
BWI–PVD	Baltimore to Providence	167	71.9%	9.4 min	0.0%
BWI–BNA	Baltimore to Nashville	164	74.4%	12.3 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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	36.1%	33.0%	40,091
Late-arriving aircraft	39.7%	40.4%	44,144
National Aviation System	20.9%	20.5%	23,218
Extreme weather	3.1%	6.0%	3,454
Security	0.2%	0.1%	276

111,183 delay minutes on 1,891 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 May 2026?

71.3% of 8,161 scheduled domestic departures left less than 15 minutes late, and 76.3% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 70.5% of 8,411 departures left on time and 0.5% were cancelled, against 71.3% and 0.3% in May 2026.

Provenance

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