Washington Dulles International in June 2025

72.9%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 June 2025, reporting carriers scheduled 5,271 domestic departures from Washington Dulles International (IAD). 72.9% left less than 15 minutes late and 69.1% reached their destination on time; 1.1% were cancelled.

Nationally that month, 71.4% of flights departed on time and 70.3% arrived on time, so IAD departures were 1.5 points above the national departure figure.

A year earlier, in June 2024, the airport had 4,517 departures with 81.1% leaving on time: a change of −8.2 points, with flights up 17%.

Flights arriving at IAD that month were on time 73.3% of the time (5,272 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 33%, air carrier 31% and national aviation system 23%.

On time 69.1%
Arrived 15+ minutes late 29.4%
Cancelled 1.1%
Diverted 0.3%

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

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

Measure	Jun 2025	Jun 2024	IAD, 12 months to Jul 2026	All reported flights, Jun 2025
Departed on time	72.9%	81.1%	82.6%	71.4%
Arrived on time	69.1%	77.8%	80.1%	70.3%
Cancelled	1.1%	1.0%	1.4%	1.6%
Average departure delay (late minutes only)	25.9 min	15.9 min	14.7 min	22.1 min
Scheduled departures a day	176	151	159	20,386
Scheduled departures	5,271	4,517	58,031	611,575

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	3,036	58%	70.8%	18.6 min	0.3%
YX Republic Airline	961	18%	67.1%	23.3 min	2.3%
DL Delta Air Lines	251	5%	70.5%	20.5 min	3.6%
OO SkyWest Airlines	235	4%	76.2%	19.9 min	0.0%
AS Alaska Airlines	210	4%	61.9%	20.2 min	0.5%
F9 Frontier Airlines	175	3%	48.6%	56.0 min	3.4%
OH PSA Airlines	148	3%	73.6%	14.7 min	5.4%
WN Southwest Airlines	111	2%	64.9%	12.4 min	1.8%
AA American Airlines	79	1%	65.8%	11.1 min	1.3%
G4 Allegiant Air	65	1%	69.2%	41.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAD–ATL	Washington to Atlanta	351	64.4%	25.8 min	3.1%
IAD–DEN	Washington to Denver	327	71.9%	11.4 min	0.9%
IAD–SFO	Washington to San Francisco	275	70.9%	23.1 min	0.0%
IAD–SEA	Washington to Seattle	240	70.4%	9.9 min	1.3%
IAD–LAX	Washington to Los Angeles	226	65.9%	22.5 min	0.0%
IAD–MCO	Washington to Orlando	197	71.6%	23.2 min	0.0%
IAD–DFW	Washington to Dallas/Fort Worth	188	66.5%	18.7 min	1.6%
IAD–ORD	Washington to Chicago	180	74.4%	14.3 min	0.0%
IAD–IAH	Washington to Houston	176	67.6%	13.1 min	1.7%
IAD–CLT	Washington to Charlotte	149	73.8%	14.5 min	5.4%
IAD–BOS	Washington to Boston	145	62.1%	28.4 min	0.0%
IAD–TPA	Washington to Tampa	141	59.6%	34.9 min	2.1%

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), June 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jun 2025	Minutes
Air carrier	30.5%	31.6%	42,707
Late-arriving aircraft	33.0%	40.6%	46,297
National Aviation System	22.7%	20.9%	31,788
Extreme weather	13.8%	6.9%	19,365
Security	0.0%	0.2%	0

140,157 delay minutes on 1,552 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 June 2025?

72.9% of 5,271 scheduled domestic departures left less than 15 minutes late, and 69.1% reached their destination on time. The national figures that month were 71.4% and 70.3%.

How does that compare with a year earlier?

In June 2024, 81.1% of 4,517 departures left on time and 1.0% were cancelled, against 72.9% and 1.1% in June 2025.

Provenance

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