James M Cox/Dayton International in July 2025

73.5%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 July 2025, reporting carriers scheduled 592 domestic departures from James M Cox/Dayton International (DAY). 73.5% left less than 15 minutes late and 74.2% reached their destination on time; 2.9% were cancelled.

Nationally that month, 69.7% of flights departed on time and 69.0% arrived on time, so DAY departures were 3.8 points above the national departure figure.

A year earlier, in July 2024, the airport had 641 departures with 75.8% leaving on time: a change of −2.3 points, with flights down 8%.

Flights arriving at DAY that month were on time 60.0% of the time (592 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 49%, air carrier 33% and national aviation system 13%.

On time 74.2%
Arrived 15+ minutes late 22.8%
Cancelled 2.9%
Diverted 0.2%

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

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

Measure	Jul 2025	Jul 2024	DAY, 12 months to Jul 2026	All reported flights, Jul 2025
Departed on time	73.5%	75.8%	78.8%	69.7%
Arrived on time	74.2%	75.4%	77.4%	69.0%
Cancelled	2.9%	3.9%	2.7%	2.5%
Average departure delay (late minutes only)	26.4 min	22.6 min	20.9 min	24.3 min
Scheduled departures a day	20	21	22	21,048
Scheduled departures	592	641	7,918	631,428

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OH PSA Airlines	381	64%	71.7%	19.0 min	3.9%
DL Delta Air Lines	115	19%	80.9%	7.5 min	0.0%
UA United Airlines	31	5%	90.3%	-8.5 min	0.0%
YX Republic Airline	31	5%	74.2%	0.8 min	6.5%
G4 Allegiant Air	27	5%	59.3%	39.9 min	0.0%
OO SkyWest Airlines	7	1%	85.7%	-3.6 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DAY–DFW	Dayton to Dallas/Fort Worth	123	75.6%	5.6 min	1.6%
DAY–ATL	Dayton to Atlanta	115	80.9%	7.5 min	0.0%
DAY–ORD	Dayton to Chicago	106	62.3%	37.5 min	3.8%
DAY–CLT	Dayton to Charlotte	87	81.6%	0.7 min	1.1%
DAY–DCA	Dayton to Washington	80	68.8%	32.7 min	10.0%
DAY–DEN	Dayton to Denver	31	90.3%	-8.5 min	0.0%
DAY–LGA	Dayton to New York	23	73.9%	2.0 min	8.7%
DAY–PGD	Dayton to Punta Gorda	9	88.9%	-8.0 min	0.0%
DAY–PIE	Dayton to St. Petersburg	9	44.4%	44.1 min	0.0%
DAY–SFB	Dayton to Sanford	9	44.4%	83.4 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), July 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2025	Minutes
Air carrier	33.1%	31.1%	4,925
Late-arriving aircraft	49.0%	40.8%	7,291
National Aviation System	13.0%	20.7%	1,937
Extreme weather	4.8%	7.3%	713
Security	0.0%	0.1%	0

14,866 delay minutes on 135 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 July 2025?

73.5% of 592 scheduled domestic departures left less than 15 minutes late, and 74.2% reached their destination on time. The national figures that month were 69.7% and 69.0%.

How does that compare with a year earlier?

In July 2024, 75.8% of 641 departures left on time and 3.9% were cancelled, against 73.5% and 2.9% in July 2025.

Provenance

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