James M Cox/Dayton International in May 2026

79.7%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 May 2026, reporting carriers scheduled 674 domestic departures from James M Cox/Dayton International (DAY). 79.7% left less than 15 minutes late and 78.8% reached their destination on time; 1.6% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so DAY departures were 2.6 points above the national departure figure.

A year earlier, in May 2025, the airport had 737 departures with 77.5% leaving on time: a change of +2.2 points, with flights down 9%.

Flights arriving at DAY that month were on time 72.9% of the time (675 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 32%, air carrier 30% and national aviation system 25%.

On time 78.8%
Arrived 15+ minutes late 19.4%
Cancelled 1.6%
Diverted 0.1%

Every scheduled departure from DAY in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	DAY, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	79.7%	77.5%	78.8%	77.1%
Arrived on time	78.8%	73.5%	77.4%	77.6%
Cancelled	1.6%	1.8%	2.7%	0.9%
Average departure delay (late minutes only)	15.1 min	25.2 min	20.9 min	16.0 min
Scheduled departures a day	23	25	22	20,391
Scheduled departures	674	737	7,918	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
OH PSA Airlines	361	54%	80.1%	0.0 min	1.4%
DL Delta Air Lines	119	18%	88.2%	-0.7 min	0.8%
OO SkyWest Airlines	86	13%	57.0%	27.6 min	4.7%
MQ Envoy Air	47	7%	87.2%	-4.4 min	0.0%
UA United Airlines	31	5%	93.5%	-10.6 min	3.2%
G4 Allegiant Air	30	4%	60.0%	21.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
DAY–ORD	Dayton to Chicago	144	68.8%	14.2 min	2.8%
DAY–DFW	Dayton to Dallas/Fort Worth	121	79.3%	3.2 min	2.5%
DAY–ATL	Dayton to Atlanta	119	88.2%	-0.7 min	0.8%
DAY–CLT	Dayton to Charlotte	118	81.4%	-0.6 min	0.0%
DAY–DCA	Dayton to Washington	80	73.8%	0.9 min	2.5%
DAY–DEN	Dayton to Denver	31	93.5%	-10.6 min	3.2%
DAY–PHL	Dayton to Philadelphia	31	93.5%	-9.9 min	0.0%
DAY–PGD	Dayton to Punta Gorda	9	77.8%	10.8 min	0.0%
DAY–PIE	Dayton to St. Petersburg	9	55.6%	5.1 min	0.0%
DAY–SFB	Dayton to Sanford	9	55.6%	48.2 min	0.0%
DAY–MYR	Dayton to Myrtle Beach	3	33.3%	23.0 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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	30.3%	33.0%	3,057
Late-arriving aircraft	31.7%	40.4%	3,197
National Aviation System	24.6%	20.5%	2,475
Extreme weather	13.4%	6.0%	1,351
Security	0.0%	0.1%	0

10,080 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 May 2026?

79.7% of 674 scheduled domestic departures left less than 15 minutes late, and 78.8% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 77.5% of 737 departures left on time and 1.8% were cancelled, against 79.7% and 1.6% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.