John Glenn Columbus International in September 2025

84.9%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 September 2025, reporting carriers scheduled 3,726 domestic departures from John Glenn Columbus International (CMH). 84.9% left less than 15 minutes late and 84.6% reached their destination on time; 0.5% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so CMH departures were 1.8 points above the national departure figure.

A year earlier, in September 2024, the airport had 3,549 departures with 88.5% leaving on time: a change of −3.6 points, with flights up 5%.

Flights arriving at CMH that month were on time 82.7% of the time (3,722 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 30%.

On time 84.6%
Arrived 15+ minutes late 14.7%
Cancelled 0.5%
Diverted 0.2%

Every scheduled departure from CMH in September 2025, judged by arrival at the destination.

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

Measure	Sep 2025	Sep 2024	CMH, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	84.9%	88.5%	79.6%	83.1%
Arrived on time	84.6%	87.5%	79.0%	82.8%
Cancelled	0.5%	0.2%	2.0%	0.5%
Average departure delay (late minutes only)	10.6 min	10.1 min	15.0 min	12.2 min
Scheduled departures a day	124	118	123	18,748
Scheduled departures	3,726	3,549	44,711	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	1,085	29%	84.7%	0.8 min	1.1%
WN Southwest Airlines	870	23%	87.7%	-2.0 min	0.1%
AA American Airlines	352	9%	84.7%	1.8 min	1.1%
UA United Airlines	339	9%	76.7%	6.8 min	0.0%
DL Delta Air Lines	332	9%	92.8%	-4.7 min	0.0%
MQ Envoy Air	227	6%	88.5%	1.2 min	0.0%
NK Spirit Airlines	205	6%	76.1%	6.5 min	0.5%
OH PSA Airlines	142	4%	77.5%	5.0 min	0.0%
OO SkyWest Airlines	92	2%	76.1%	7.9 min	1.1%
AS Alaska Airlines	48	1%	89.6%	-4.5 min	0.0%
F9 Frontier Airlines	34	1%	67.6%	17.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMH–ORD	Columbus to Chicago	411	78.1%	6.7 min	0.2%
CMH–ATL	Columbus to Atlanta	277	93.1%	-5.2 min	0.0%
CMH–LGA	Columbus to New York	260	86.2%	2.2 min	1.2%
CMH–EWR	Columbus to Newark	200	78.5%	3.2 min	3.0%
CMH–BOS	Columbus to Boston	180	65.0%	14.9 min	1.7%
CMH–DCA	Columbus to Washington	171	81.9%	3.1 min	0.0%
CMH–MCO	Columbus to Orlando	168	85.1%	-0.6 min	0.0%
CMH–CLT	Columbus to Charlotte	159	91.8%	-9.3 min	0.0%
CMH–JFK	Columbus to New York	150	90.7%	-2.7 min	0.7%
CMH–DEN	Columbus to Denver	146	84.9%	-1.2 min	0.0%
CMH–IAD	Columbus to Washington	136	91.2%	-2.2 min	0.0%
CMH–DFW	Columbus to Dallas/Fort Worth	127	85.0%	4.4 min	1.6%

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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	33.7%	34.3%	12,409
Late-arriving aircraft	32.5%	37.4%	11,956
National Aviation System	30.4%	22.6%	11,202
Extreme weather	3.2%	5.6%	1,182
Security	0.2%	0.1%	84

36,833 delay minutes on 549 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 CMH on time in September 2025?

84.9% of 3,726 scheduled domestic departures left less than 15 minutes late, and 84.6% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 88.5% of 3,549 departures left on time and 0.2% were cancelled, against 84.9% and 0.5% in September 2025.

Provenance

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