James M Cox/Dayton International in August 2025

79.6%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 August 2025, reporting carriers scheduled 643 domestic departures from James M Cox/Dayton International (DAY). 79.6% left less than 15 minutes late and 77.3% reached their destination on time; 2.0% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so DAY departures were 2.8 points above the national departure figure.

A year earlier, in August 2024, the airport had 634 departures with 82.6% leaving on time: a change of −3.0 points, with flights up 1%.

Flights arriving at DAY that month were on time 72.3% of the time (643 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 50%, air carrier 29% and national aviation system 21%.

On time 77.3%
Arrived 15+ minutes late 20.4%
Cancelled 2.0%
Diverted 0.3%

Every scheduled departure from DAY in August 2025, judged by arrival at the destination.

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

Measure	Aug 2025	Aug 2024	DAY, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	79.6%	82.6%	78.8%	76.8%
Arrived on time	77.3%	81.4%	77.4%	76.3%
Cancelled	2.0%	0.9%	2.7%	1.1%
Average departure delay (late minutes only)	18.1 min	16.4 min	20.9 min	17.6 min
Scheduled departures a day	21	21	22	20,079
Scheduled departures	643	634	7,918	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OH PSA Airlines	436	68%	75.9%	10.2 min	1.8%
DL Delta Air Lines	112	17%	85.7%	-6.7 min	0.9%
UA United Airlines	31	5%	87.1%	-3.4 min	0.0%
OO SkyWest Airlines	28	4%	60.7%	19.9 min	14.3%
YX Republic Airline	21	3%	81.0%	22.5 min	0.0%
G4 Allegiant Air	15	2%	60.0%	3.8 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DAY–ORD	Dayton to Chicago	121	62.8%	20.7 min	6.6%
DAY–DFW	Dayton to Dallas/Fort Worth	120	76.7%	7.3 min	1.7%
DAY–CLT	Dayton to Charlotte	116	82.8%	1.2 min	0.0%
DAY–ATL	Dayton to Atlanta	112	85.7%	-6.7 min	0.9%
DAY–DCA	Dayton to Washington	81	75.3%	21.9 min	2.5%
DAY–DEN	Dayton to Denver	31	87.1%	-3.4 min	0.0%
DAY–PHL	Dayton to Philadelphia	26	88.5%	-9.2 min	0.0%
DAY–LGA	Dayton to New York	21	81.0%	22.5 min	0.0%
DAY–PIE	Dayton to St. Petersburg	9	33.3%	15.1 min	0.0%
DAY–PGD	Dayton to Punta Gorda	3	100.0%	-12.3 min	0.0%
DAY–SFB	Dayton to Sanford	3	100.0%	-14.0 min	0.0%

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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	28.5%	33.1%	3,195
Late-arriving aircraft	49.8%	40.5%	5,579
National Aviation System	20.5%	19.2%	2,292
Extreme weather	1.2%	7.0%	132
Security	0.0%	0.1%	0

11,198 delay minutes on 131 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 DAY on time in August 2025?

79.6% of 643 scheduled domestic departures left less than 15 minutes late, and 77.3% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 82.6% of 634 departures left on time and 0.9% were cancelled, against 79.6% and 2.0% in August 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for DAY · methodology · corrections.