John Glenn Columbus International in August 2025

82.7%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 August 2025, reporting carriers scheduled 3,758 domestic departures from John Glenn Columbus International (CMH). 82.7% left less than 15 minutes late and 80.8% reached their destination on time; 1.4% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so CMH departures were 5.9 points above the national departure figure.

A year earlier, in August 2024, the airport had 3,707 departures with 79.7% leaving on time: a change of +3.0 points, with flights up 1%.

Flights arriving at CMH that month were on time 77.4% of the time (3,758 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 38%, air carrier 34% and national aviation system 28%.

On time 80.8%
Arrived 15+ minutes late 17.6%
Cancelled 1.4%
Diverted 0.2%

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

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

Measure	Aug 2025	Aug 2024	CMH, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	82.7%	79.7%	79.6%	76.8%
Arrived on time	80.8%	79.2%	79.0%	76.3%
Cancelled	1.4%	2.2%	2.0%	1.1%
Average departure delay (late minutes only)	12.6 min	16.8 min	15.0 min	17.6 min
Scheduled departures a day	125	124	123	20,079
Scheduled departures	3,758	3,707	44,711	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	1,073	29%	84.2%	-0.5 min	1.2%
WN Southwest Airlines	915	24%	83.7%	2.0 min	0.5%
DL Delta Air Lines	379	10%	86.3%	0.0 min	2.1%
AA American Airlines	350	9%	73.1%	15.7 min	2.3%
UA United Airlines	288	8%	68.8%	14.1 min	2.1%
MQ Envoy Air	246	7%	83.7%	2.2 min	1.2%
OH PSA Airlines	196	5%	77.0%	16.5 min	2.0%
NK Spirit Airlines	150	4%	82.7%	0.6 min	0.7%
OO SkyWest Airlines	66	2%	62.1%	20.3 min	4.5%
AS Alaska Airlines	57	2%	73.7%	7.6 min	0.0%
F9 Frontier Airlines	38	1%	55.3%	29.3 min	5.3%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMH–ORD	Columbus to Chicago	407	74.4%	5.7 min	3.4%
CMH–ATL	Columbus to Atlanta	296	85.1%	1.0 min	2.0%
CMH–LGA	Columbus to New York	228	82.9%	1.3 min	1.3%
CMH–DCA	Columbus to Washington	180	77.8%	6.8 min	1.1%
CMH–BOS	Columbus to Boston	175	87.4%	-1.8 min	1.1%
CMH–PHL	Columbus to Philadelphia	169	75.1%	12.3 min	3.0%
CMH–CLT	Columbus to Charlotte	165	83.6%	14.4 min	0.6%
CMH–MCO	Columbus to Orlando	157	77.1%	10.8 min	0.6%
CMH–JFK	Columbus to New York	155	80.6%	-1.1 min	1.3%
CMH–EWR	Columbus to Newark	152	81.6%	1.1 min	1.3%
CMH–DEN	Columbus to Denver	148	72.3%	12.3 min	0.7%
CMH–DFW	Columbus to Dallas/Fort Worth	140	71.4%	20.4 min	2.9%

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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	33.9%	33.1%	15,318
Late-arriving aircraft	37.8%	40.5%	17,093
National Aviation System	27.7%	19.2%	12,515
Extreme weather	0.6%	7.0%	267
Security	0.0%	0.1%	0

45,193 delay minutes on 662 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 August 2025?

82.7% of 3,758 scheduled domestic departures left less than 15 minutes late, and 80.8% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 79.7% of 3,707 departures left on time and 2.2% were cancelled, against 82.7% and 1.4% in August 2025.

Provenance

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