Washington Dulles International in March 2026

78.4%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 2026, reporting carriers scheduled 4,983 domestic departures from Washington Dulles International (IAD). 78.4% left less than 15 minutes late and 77.9% reached their destination on time; 1.8% were cancelled.

Nationally that month, 72.8% of flights departed on time and 73.2% arrived on time, so IAD departures were 5.6 points above the national departure figure.

A year earlier, in March 2025, the airport had 4,615 departures with 85.5% leaving on time: a change of −7.1 points, with flights up 8%.

Flights arriving at IAD that month were on time 77.4% of the time (4,918 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 34%, air carrier 33% and national aviation system 29%.

On time 77.9%
Arrived 15+ minutes late 20.0%
Cancelled 1.8%
Diverted 0.3%

Every scheduled departure from IAD in March 2026, judged by arrival at the destination.

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

Measure	Mar 2026	Mar 2025	IAD, 12 months to Jul 2026	All reported flights, Mar 2026
Departed on time	78.4%	85.5%	82.6%	72.8%
Arrived on time	77.9%	83.9%	80.1%	73.2%
Cancelled	1.8%	0.4%	1.4%	2.9%
Average departure delay (late minutes only)	19.5 min	11.6 min	14.7 min	20.3 min
Scheduled departures a day	166	154	159	20,403
Scheduled departures	4,983	4,615	58,031	612,102

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	3,306	66%	81.4%	4.3 min	0.8%
YX Republic Airline	735	15%	71.3%	10.9 min	3.8%
DL Delta Air Lines	244	5%	73.4%	15.2 min	3.7%
OO SkyWest Airlines	214	4%	62.6%	43.0 min	6.1%
AA American Airlines	93	2%	79.6%	5.0 min	3.2%
WN Southwest Airlines	93	2%	75.3%	14.2 min	1.1%
AS Alaska Airlines	86	2%	61.6%	10.9 min	0.0%
OH PSA Airlines	85	2%	77.6%	-1.7 min	7.1%
F9 Frontier Airlines	84	2%	67.9%	14.6 min	2.4%
G4 Allegiant Air	43	1%	74.4%	0.1 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAD–ATL	Washington to Atlanta	305	77.0%	15.0 min	2.3%
IAD–DEN	Washington to Denver	300	80.0%	3.9 min	0.7%
IAD–SFO	Washington to San Francisco	209	86.1%	-5.3 min	1.9%
IAD–MCO	Washington to Orlando	197	82.7%	-0.3 min	2.0%
IAD–LAX	Washington to Los Angeles	184	84.8%	-8.5 min	0.0%
IAD–CLT	Washington to Charlotte	179	79.9%	-0.6 min	5.0%
IAD–DFW	Washington to Dallas/Fort Worth	149	77.2%	5.6 min	2.0%
IAD–ORD	Washington to Chicago	148	74.3%	20.1 min	2.7%
IAD–IAH	Washington to Houston	144	83.3%	2.0 min	1.4%
IAD–DTW	Washington to Detroit	128	64.1%	29.2 min	3.1%
IAD–TPA	Washington to Tampa	128	80.5%	11.1 min	0.8%
IAD–EWR	Washington to Newark	124	75.0%	16.1 min	1.6%

By scheduled departure hour

100

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), March 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2026	Minutes
Air carrier	32.8%	33.5%	29,959
Late-arriving aircraft	33.7%	39.3%	30,858
National Aviation System	28.9%	21.0%	26,468
Extreme weather	4.5%	5.9%	4,135
Security	0.0%	0.2%	33

91,453 delay minutes on 996 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 2026?

78.4% of 4,983 scheduled domestic departures left less than 15 minutes late, and 77.9% reached their destination on time. The national figures that month were 72.8% and 73.2%.

How does that compare with a year earlier?

In March 2025, 85.5% of 4,615 departures left on time and 0.4% were cancelled, against 78.4% and 1.8% in March 2026.

Provenance

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