Washington Dulles International in March 2025

85.5%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 March 2025, reporting carriers scheduled 4,615 domestic departures from Washington Dulles International (IAD). 85.5% left less than 15 minutes late and 83.9% reached their destination on time; 0.4% were cancelled.

Nationally that month, 79.9% of flights departed on time and 79.3% arrived on time, so IAD departures were 5.6 points above the national departure figure.

A year earlier, in March 2024, the airport had 4,277 departures with 84.3% leaving on time: a change of +1.2 points, with flights up 8%.

Flights arriving at IAD that month were on time 83.5% of the time (4,617 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 34%, late-arriving aircraft 30% and air carrier 28%.

On time 83.9%
Arrived 15+ minutes late 15.5%
Cancelled 0.4%
Diverted 0.1%

Every scheduled departure from IAD in March 2025, judged by arrival at the destination.

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

Measure	Mar 2025	Mar 2024	IAD, 12 months to Jul 2026	All reported flights, Mar 2025
Departed on time	85.5%	84.3%	82.6%	79.9%
Arrived on time	83.9%	84.4%	80.1%	79.3%
Cancelled	0.4%	0.3%	1.4%	1.2%
Average departure delay (late minutes only)	11.6 min	11.4 min	14.7 min	14.9 min
Scheduled departures a day	154	143	159	20,029
Scheduled departures	4,615	4,277	58,031	600,872

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	2,956	64%	84.3%	-1.2 min	0.2%
YX Republic Airline	638	14%	85.6%	-0.2 min	0.3%
DL Delta Air Lines	255	6%	88.2%	-4.7 min	0.0%
OO SkyWest Airlines	220	5%	85.0%	1.6 min	0.5%
AS Alaska Airlines	125	3%	80.8%	-3.8 min	0.8%
OH PSA Airlines	110	2%	80.0%	-1.0 min	2.7%
WN Southwest Airlines	110	2%	90.0%	-8.0 min	0.9%
F9 Frontier Airlines	91	2%	56.0%	35.5 min	3.3%
AA American Airlines	84	2%	77.4%	12.6 min	1.2%
G4 Allegiant Air	26	1%	73.1%	18.8 min	3.8%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAD–ATL	Washington to Atlanta	315	79.4%	5.4 min	0.6%
IAD–DEN	Washington to Denver	293	89.1%	-9.3 min	0.3%
IAD–SFO	Washington to San Francisco	226	84.1%	-1.9 min	0.4%
IAD–MCO	Washington to Orlando	217	76.5%	10.3 min	0.5%
IAD–LAX	Washington to Los Angeles	205	89.8%	-10.8 min	0.0%
IAD–DFW	Washington to Dallas/Fort Worth	165	83.6%	2.5 min	1.2%
IAD–IAH	Washington to Houston	153	88.9%	-3.9 min	0.0%
IAD–TPA	Washington to Tampa	153	74.5%	8.1 min	2.0%
IAD–ORD	Washington to Chicago	152	82.9%	-0.5 min	0.0%
IAD–CLT	Washington to Charlotte	149	80.5%	-0.1 min	2.0%
IAD–EWR	Washington to Newark	128	76.6%	15.9 min	0.0%
IAD–BOS	Washington to Boston	126	81.0%	8.3 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), March 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2025	Minutes
Air carrier	27.5%	33.0%	14,388
Late-arriving aircraft	29.7%	39.2%	15,514
National Aviation System	33.6%	21.9%	17,571
Extreme weather	9.1%	5.9%	4,766
Security	0.1%	0.1%	30

52,269 delay minutes on 717 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 IAD on time in March 2025?

85.5% of 4,615 scheduled domestic departures left less than 15 minutes late, and 83.9% reached their destination on time. The national figures that month were 79.9% and 79.3%.

How does that compare with a year earlier?

In March 2024, 84.3% of 4,277 departures left on time and 0.3% were cancelled, against 85.5% and 0.4% in March 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for March 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for IAD · methodology · corrections.