Washington Dulles International in October 2024

90.0%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 October 2024, reporting carriers scheduled 4,662 domestic departures from Washington Dulles International (IAD). 90.0% left less than 15 minutes late and 90.6% reached their destination on time; 0.7% were cancelled.

Nationally that month, 85.5% of flights departed on time and 85.8% arrived on time, so IAD departures were 4.5 points above the national departure figure.

A year earlier, in October 2023, the airport had 4,527 departures with 88.8% leaving on time: a change of +1.2 points, with flights up 3%.

Flights arriving at IAD that month were on time 89.9% of the time (4,663 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 44%, late-arriving aircraft 35% and national aviation system 20%.

On time 90.6%
Arrived 15+ minutes late 8.7%
Cancelled 0.7%
Diverted 0.1%

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

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

Measure	Oct 2024	Oct 2023	IAD, 12 months to Jul 2026	All reported flights, Oct 2024
Departed on time	90.0%	88.8%	82.6%	85.5%
Arrived on time	90.6%	88.8%	80.1%	85.8%
Cancelled	0.7%	0.2%	1.4%	1.0%
Average departure delay (late minutes only)	6.4 min	8.2 min	14.7 min	9.4 min
Scheduled departures a day	155	151	159	20,517
Scheduled departures	4,662	4,527	58,031	615,497

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	2,926	63%	90.4%	-6.9 min	0.9%
YX Republic Airline	659	14%	93.2%	-7.4 min	0.0%
DL Delta Air Lines	282	6%	92.2%	-8.5 min	0.0%
OO SkyWest Airlines	234	5%	89.7%	-4.1 min	0.0%
AS Alaska Airlines	163	3%	77.9%	1.2 min	1.2%
OH PSA Airlines	137	3%	91.2%	-3.3 min	0.0%
WN Southwest Airlines	97	2%	94.8%	-9.2 min	0.0%
AA American Airlines	84	2%	91.7%	-15.6 min	0.0%
9E Endeavor Air	63	1%	96.8%	-15.8 min	0.0%
G4 Allegiant Air	17	0%	70.6%	-0.5 min	11.8%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
IAD–ATL	Washington to Atlanta	318	90.6%	-6.7 min	0.3%
IAD–DEN	Washington to Denver	283	90.1%	-8.0 min	0.7%
IAD–SFO	Washington to San Francisco	267	94.0%	-12.3 min	0.4%
IAD–LAX	Washington to Los Angeles	240	90.4%	-7.6 min	0.0%
IAD–SEA	Washington to Seattle	193	91.7%	-11.5 min	0.5%
IAD–CLT	Washington to Charlotte	178	87.6%	-3.2 min	0.0%
IAD–DFW	Washington to Dallas/Fort Worth	176	93.8%	-14.8 min	0.0%
IAD–IAH	Washington to Houston	155	88.4%	-3.3 min	0.0%
IAD–ORD	Washington to Chicago	155	89.7%	-4.2 min	0.0%
IAD–BOS	Washington to Boston	124	89.5%	-1.6 min	0.0%
IAD–MCO	Washington to Orlando	124	87.1%	-6.1 min	6.5%
IAD–SAN	Washington to San Diego	124	75.8%	1.1 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), October 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Oct 2024	Minutes
Air carrier	43.8%	42.7%	10,052
Late-arriving aircraft	35.2%	37.4%	8,074
National Aviation System	19.9%	16.3%	4,554
Extreme weather	1.1%	3.4%	250
Security	0.0%	0.2%	0

22,930 delay minutes on 404 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 October 2024?

90.0% of 4,662 scheduled domestic departures left less than 15 minutes late, and 90.6% reached their destination on time. The national figures that month were 85.5% and 85.8%.

How does that compare with a year earlier?

In October 2023, 88.8% of 4,527 departures left on time and 0.2% were cancelled, against 90.0% and 0.7% in October 2024.

Provenance

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