James M Cox/Dayton International in December 2025

72.8%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 December 2025, reporting carriers scheduled 659 domestic departures from James M Cox/Dayton International (DAY). 72.8% left less than 15 minutes late and 71.9% reached their destination on time; 2.6% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so DAY departures were 0.8 points above the national departure figure.

A year earlier, in December 2024, the airport had 586 departures with 78.5% leaving on time: a change of −5.7 points, with flights up 12%.

Flights arriving at DAY that month were on time 64.7% of the time (658 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 52%, air carrier 21% and national aviation system 17%.

On time 71.9%
Arrived 15+ minutes late 25.3%
Cancelled 2.6%
Diverted 0.2%

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

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

Measure	Dec 2025	Dec 2024	DAY, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	72.8%	78.5%	78.8%	72.0%
Arrived on time	71.9%	77.8%	77.4%	71.9%
Cancelled	2.6%	1.0%	2.7%	1.5%
Average departure delay (late minutes only)	27.5 min	18.4 min	20.9 min	21.2 min
Scheduled departures a day	22	20	22	19,410
Scheduled departures	659	586	7,918	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OH PSA Airlines	394	60%	72.3%	19.6 min	2.0%
DL Delta Air Lines	94	14%	88.3%	-10.5 min	1.1%
MQ Envoy Air	46	7%	56.5%	22.3 min	8.7%
OO SkyWest Airlines	46	7%	54.3%	40.0 min	4.3%
UA United Airlines	33	5%	69.7%	9.4 min	0.0%
G4 Allegiant Air	31	5%	61.3%	35.8 min	3.2%
YX Republic Airline	15	2%	86.7%	-7.9 min	6.7%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DAY–ORD	Dayton to Chicago	176	59.1%	26.7 min	5.7%
DAY–DFW	Dayton to Dallas/Fort Worth	122	77.0%	11.7 min	0.0%
DAY–CLT	Dayton to Charlotte	111	79.3%	15.3 min	0.0%
DAY–ATL	Dayton to Atlanta	94	88.3%	-10.5 min	1.1%
DAY–DCA	Dayton to Washington	63	60.3%	47.9 min	4.8%
DAY–DEN	Dayton to Denver	31	74.2%	7.0 min	0.0%
DAY–PHL	Dayton to Philadelphia	31	80.6%	-7.0 min	6.5%
DAY–PGD	Dayton to Punta Gorda	13	76.9%	22.2 min	0.0%
DAY–PIE	Dayton to St. Petersburg	9	66.7%	14.6 min	11.1%
DAY–SFB	Dayton to Sanford	9	33.3%	74.3 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), December 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	21.3%	33.3%	3,758
Late-arriving aircraft	51.9%	41.1%	9,170
National Aviation System	17.0%	19.1%	3,009
Extreme weather	9.8%	6.4%	1,732
Security	0.0%	0.2%	0

17,669 delay minutes on 167 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 December 2025?

72.8% of 659 scheduled domestic departures left less than 15 minutes late, and 71.9% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 78.5% of 586 departures left on time and 1.0% were cancelled, against 72.8% and 2.6% in December 2025.

Provenance

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