Washington Dulles International in June 2026

82.1%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 2026, reporting carriers scheduled 5,053 domestic departures from Washington Dulles International (IAD). 82.1% left less than 15 minutes late and 77.1% reached their destination on time; 0.9% were cancelled.

Nationally that month, 72.2% of flights departed on time and 72.8% arrived on time, so IAD departures were 9.9 points above the national departure figure.

A year earlier, in June 2025, the airport had 5,271 departures with 72.9% leaving on time: a change of +9.2 points, with flights down 4%.

Flights arriving at IAD that month were on time 81.9% of the time (5,084 scheduled arrivals).

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

On time 77.1%
Arrived 15+ minutes late 21.6%
Cancelled 0.9%
Diverted 0.3%

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

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

Measure	Jun 2026	Jun 2025	IAD, 12 months to Jul 2026	All reported flights, Jun 2026
Departed on time	82.1%	72.9%	82.6%	72.2%
Arrived on time	77.1%	69.1%	80.1%	72.8%
Cancelled	0.9%	1.1%	1.4%	1.6%
Average departure delay (late minutes only)	17.3 min	25.9 min	14.7 min	20.6 min
Scheduled departures a day	168	176	159	20,253
Scheduled departures	5,053	5,271	58,031	607,577

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	3,162	63%	78.3%	8.3 min	0.6%
YX Republic Airline	697	14%	77.6%	11.1 min	1.4%
DL Delta Air Lines	300	6%	80.3%	2.4 min	1.0%
OO SkyWest Airlines	239	5%	80.8%	11.0 min	0.4%
F9 Frontier Airlines	217	4%	66.4%	16.1 min	3.2%
AA American Airlines	180	4%	68.3%	22.2 min	2.2%
AS Alaska Airlines	120	2%	70.0%	5.6 min	1.7%
G4 Allegiant Air	70	1%	54.3%	51.9 min	0.0%
OH PSA Airlines	59	1%	83.1%	19.2 min	3.4%
WN Southwest Airlines	9	0%	88.9%	-7.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAD–ATL	Washington to Atlanta	381	75.3%	6.8 min	1.8%
IAD–DEN	Washington to Denver	263	79.8%	5.9 min	0.0%
IAD–LAX	Washington to Los Angeles	253	80.2%	6.3 min	1.2%
IAD–SFO	Washington to San Francisco	234	63.2%	15.5 min	0.4%
IAD–ORD	Washington to Chicago	210	79.0%	14.4 min	0.5%
IAD–SEA	Washington to Seattle	198	77.3%	6.0 min	1.5%
IAD–DFW	Washington to Dallas/Fort Worth	196	64.3%	34.4 min	2.6%
IAD–IAH	Washington to Houston	180	76.7%	10.8 min	0.0%
IAD–MCO	Washington to Orlando	169	78.1%	1.3 min	0.6%
IAD–EWR	Washington to Newark	150	77.3%	5.5 min	1.3%
IAD–BOS	Washington to Boston	120	79.2%	0.5 min	2.5%
IAD–DTW	Washington to Detroit	120	81.7%	2.0 min	1.7%

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), June 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Jun 2026	Minutes
Air carrier	29.6%	30.8%	27,561
Late-arriving aircraft	30.4%	42.1%	28,373
National Aviation System	29.7%	20.3%	27,705
Extreme weather	10.2%	6.7%	9,508
Security	0.1%	0.1%	47

93,194 delay minutes on 1,093 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 2026?

82.1% of 5,053 scheduled domestic departures left less than 15 minutes late, and 77.1% reached their destination on time. The national figures that month were 72.2% and 72.8%.

How does that compare with a year earlier?

In June 2025, 72.9% of 5,271 departures left on time and 1.1% were cancelled, against 82.1% and 0.9% in June 2026.

Provenance

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