John Glenn Columbus International in July 2025

70.8%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 July 2025, reporting carriers scheduled 3,933 domestic departures from John Glenn Columbus International (CMH). 70.8% left less than 15 minutes late and 70.4% reached their destination on time; 3.4% were cancelled.

Nationally that month, 69.7% of flights departed on time and 69.0% arrived on time, so CMH departures were 1.1 points above the national departure figure.

A year earlier, in July 2024, the airport had 3,797 departures with 75.4% leaving on time: a change of −4.6 points, with flights up 4%.

Flights arriving at CMH that month were on time 64.7% of the time (3,933 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 36%, air carrier 28% and national aviation system 26%.

On time 70.4%
Arrived 15+ minutes late 25.6%
Cancelled 3.4%
Diverted 0.6%

Every scheduled departure from CMH 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	CMH, 12 months to Jul 2026	All reported flights, Jul 2025
Departed on time	70.8%	75.4%	79.6%	69.7%
Arrived on time	70.4%	74.9%	79.0%	69.0%
Cancelled	3.4%	2.6%	2.0%	2.5%
Average departure delay (late minutes only)	21.9 min	19.8 min	15.0 min	24.3 min
Scheduled departures a day	131	127	123	21,048
Scheduled departures	3,933	3,797	44,711	631,428

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	1,092	28%	72.1%	12.1 min	1.3%
YX Republic Airline	1,055	27%	72.2%	11.1 min	6.5%
DL Delta Air Lines	399	10%	81.0%	3.2 min	1.0%
AA American Airlines	355	9%	68.5%	14.0 min	4.2%
UA United Airlines	260	7%	59.6%	29.2 min	0.4%
MQ Envoy Air	255	6%	72.5%	19.3 min	0.4%
NK Spirit Airlines	154	4%	68.8%	10.4 min	4.5%
OH PSA Airlines	146	4%	56.8%	44.1 min	9.6%
OO SkyWest Airlines	124	3%	54.8%	38.9 min	6.5%
AS Alaska Airlines	61	2%	63.9%	15.9 min	1.6%
F9 Frontier Airlines	32	1%	53.1%	29.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMH–ORD	Columbus to Chicago	398	63.8%	29.2 min	2.3%
CMH–ATL	Columbus to Atlanta	299	80.6%	5.4 min	0.3%
CMH–LGA	Columbus to New York	252	64.3%	14.5 min	13.5%
CMH–DCA	Columbus to Washington	180	54.4%	37.7 min	10.6%
CMH–MCO	Columbus to Orlando	178	71.9%	13.5 min	0.6%
CMH–BOS	Columbus to Boston	172	81.4%	7.0 min	0.6%
CMH–CLT	Columbus to Charlotte	165	83.0%	4.0 min	2.4%
CMH–DEN	Columbus to Denver	163	68.1%	16.8 min	0.6%
CMH–EWR	Columbus to Newark	160	65.6%	14.2 min	8.8%
CMH–JFK	Columbus to New York	154	69.5%	10.5 min	6.5%
CMH–DFW	Columbus to Dallas/Fort Worth	153	69.9%	9.8 min	3.3%
CMH–MDW	Columbus to Chicago	131	71.0%	16.8 min	0.8%

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), July 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2025	Minutes
Air carrier	28.3%	31.1%	22,634
Late-arriving aircraft	36.3%	40.8%	29,005
National Aviation System	26.0%	20.7%	20,795
Extreme weather	9.2%	7.3%	7,375
Security	0.1%	0.1%	51

79,860 delay minutes on 1,007 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 July 2025?

70.8% of 3,933 scheduled domestic departures left less than 15 minutes late, and 70.4% 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, 75.4% of 3,797 departures left on time and 2.6% were cancelled, against 70.8% and 3.4% 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 CMH · methodology · corrections.