James M Cox/Dayton International in April 2025

84.4%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 April 2025, reporting carriers scheduled 675 domestic departures from James M Cox/Dayton International (DAY). 84.4% left less than 15 minutes late and 78.8% reached their destination on time; 1.5% were cancelled.

Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so DAY departures were 3.8 points above the national departure figure.

A year earlier, in April 2024, the airport had 686 departures with 87.3% leaving on time: a change of −2.9 points, with flights down 2%.

Flights arriving at DAY that month were on time 76.8% of the time (677 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 34%, late-arriving aircraft 33% and national aviation system 21%.

On time 78.8%
Arrived 15+ minutes late 19.6%
Cancelled 1.5%
Diverted 0.1%

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

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

Measure	Apr 2025	Apr 2024	DAY, 12 months to Jul 2026	All reported flights, Apr 2025
Departed on time	84.4%	87.3%	78.8%	80.6%
Arrived on time	78.8%	83.5%	77.4%	79.5%
Cancelled	1.5%	0.6%	2.7%	0.8%
Average departure delay (late minutes only)	13.5 min	12.7 min	20.9 min	14.1 min
Scheduled departures a day	23	23	22	19,465
Scheduled departures	675	686	7,918	583,950

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OH PSA Airlines	342	51%	75.1%	8.3 min	2.3%
OO SkyWest Airlines	128	19%	78.1%	8.8 min	0.8%
DL Delta Air Lines	114	17%	96.5%	-15.2 min	0.0%
YX Republic Airline	38	6%	78.9%	-0.8 min	0.0%
MQ Envoy Air	29	4%	69.0%	13.9 min	3.4%
G4 Allegiant Air	24	4%	62.5%	16.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DAY–DFW	Dayton to Dallas/Fort Worth	119	69.7%	4.0 min	4.2%
DAY–ATL	Dayton to Atlanta	114	96.5%	-15.2 min	0.0%
DAY–CLT	Dayton to Charlotte	112	79.5%	20.4 min	1.8%
DAY–DCA	Dayton to Washington	110	69.1%	9.1 min	1.8%
DAY–ORD	Dayton to Chicago	110	75.5%	12.4 min	0.9%
DAY–DEN	Dayton to Denver	30	86.7%	-6.8 min	0.0%
DAY–PHL	Dayton to Philadelphia	30	96.7%	-18.1 min	0.0%
DAY–LGA	Dayton to New York	26	80.8%	-2.2 min	0.0%
DAY–PGD	Dayton to Punta Gorda	8	87.5%	-1.5 min	0.0%
DAY–PIE	Dayton to St. Petersburg	8	62.5%	14.3 min	0.0%
DAY–SFB	Dayton to Sanford	8	37.5%	35.4 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), April 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2025	Minutes
Air carrier	33.5%	32.7%	3,379
Late-arriving aircraft	33.1%	39.4%	3,342
National Aviation System	21.2%	22.2%	2,143
Extreme weather	12.2%	5.5%	1,233
Security	0.0%	0.2%	1

10,098 delay minutes on 132 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 April 2025?

84.4% of 675 scheduled domestic departures left less than 15 minutes late, and 78.8% reached their destination on time. The national figures that month were 80.6% and 79.5%.

How does that compare with a year earlier?

In April 2024, 87.3% of 686 departures left on time and 0.6% were cancelled, against 84.4% and 1.5% in April 2025.

Provenance

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