Washington Dulles International in June 2024

81.1%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 2024, reporting carriers scheduled 4,517 domestic departures from Washington Dulles International (IAD). 81.1% left less than 15 minutes late and 77.8% reached their destination on time; 1.0% were cancelled.

Nationally that month, 73.7% of flights departed on time and 73.9% arrived on time, so IAD departures were 7.4 points above the national departure figure.

Flights arriving at IAD that month were on time 81.2% of the time (4,520 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 40%, late-arriving aircraft 35% and national aviation system 20%.

On time 77.8%
Arrived 15+ minutes late 21.0%
Cancelled 1.0%
Diverted 0.2%

Every scheduled departure from IAD in June 2024, judged by arrival at the destination.

June 2024 against a year earlier, the airport's year and the nation

Measure	Jun 2024	Year earlier	IAD, 12 months to Jul 2026	All reported flights, Jun 2024
Departed on time	81.1%	—	82.6%	73.7%
Arrived on time	77.8%	—	80.1%	73.9%
Cancelled	1.0%	—	1.4%	1.3%
Average departure delay (late minutes only)	15.9 min	—	14.7 min	19.7 min
Scheduled departures a day	151	—	159	20,371
Scheduled departures	4,517	—	58,031	611,132

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	2,670	59%	77.8%	7.8 min	0.8%
YX Republic Airline	669	15%	83.4%	-0.2 min	1.9%
DL Delta Air Lines	295	7%	81.7%	5.3 min	0.0%
OO SkyWest Airlines	279	6%	68.5%	24.0 min	2.9%
AS Alaska Airlines	240	5%	70.0%	10.1 min	0.0%
OH PSA Airlines	152	3%	86.8%	2.9 min	0.7%
WN Southwest Airlines	110	2%	66.4%	8.6 min	1.8%
AA American Airlines	58	1%	82.8%	1.4 min	1.7%
G4 Allegiant Air	44	1%	59.1%	34.2 min	2.3%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAD–ATL	Washington to Atlanta	312	82.7%	4.7 min	0.0%
IAD–DEN	Washington to Denver	290	74.5%	6.4 min	1.4%
IAD–SEA	Washington to Seattle	270	64.4%	14.9 min	0.4%
IAD–SFO	Washington to San Francisco	240	76.7%	7.9 min	0.0%
IAD–LAX	Washington to Los Angeles	236	82.2%	2.7 min	1.3%
IAD–CLT	Washington to Charlotte	190	84.2%	2.9 min	0.5%
IAD–IAH	Washington to Houston	150	74.7%	5.1 min	1.3%
IAD–ORD	Washington to Chicago	150	78.0%	11.3 min	0.0%
IAD–DFW	Washington to Dallas/Fort Worth	138	81.9%	4.2 min	1.4%
IAD–BOS	Washington to Boston	120	78.3%	17.4 min	0.0%
IAD–MCO	Washington to Orlando	120	72.5%	10.9 min	0.0%
IAD–SAN	Washington to San Diego	120	84.2%	-1.6 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), June 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Jun 2024	Minutes
Air carrier	39.9%	34.4%	27,571
Late-arriving aircraft	35.4%	41.5%	24,472
National Aviation System	19.5%	17.8%	13,470
Extreme weather	5.1%	6.0%	3,528
Security	0.0%	0.2%	18

69,059 delay minutes on 949 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 2024?

81.1% of 4,517 scheduled domestic departures left less than 15 minutes late, and 77.8% reached their destination on time. The national figures that month were 73.7% and 73.9%.

How does that compare with a year earlier?

June 2023 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for June 2024; 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.