John Glenn Columbus International in May 2025

79.0%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 2025, reporting carriers scheduled 3,851 domestic departures from John Glenn Columbus International (CMH). 79.0% left less than 15 minutes late and 76.5% reached their destination on time; 1.2% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so CMH departures were 2.3 points above the national departure figure.

A year earlier, in May 2024, the airport had 3,580 departures with 79.0% leaving on time: a change of 0.0 points, with flights up 8%.

Flights arriving at CMH that month were on time 72.4% of the time (3,857 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, national aviation system 35%, late-arriving aircraft 34% and air carrier 24%.

On time 76.5%
Arrived 15+ minutes late 22.0%
Cancelled 1.2%
Diverted 0.2%

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

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

Measure	May 2025	May 2024	CMH, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	79.0%	79.0%	79.6%	76.7%
Arrived on time	76.5%	78.4%	79.0%	75.4%
Cancelled	1.2%	1.1%	2.0%	1.0%
Average departure delay (late minutes only)	15.9 min	15.3 min	15.0 min	17.5 min
Scheduled departures a day	128	119	123	20,188
Scheduled departures	3,851	3,580	44,711	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	1,046	27%	76.6%	11.5 min	2.4%
WN Southwest Airlines	1,038	27%	81.6%	3.7 min	0.1%
DL Delta Air Lines	360	9%	81.4%	2.4 min	0.0%
MQ Envoy Air	316	8%	75.0%	9.0 min	0.6%
AA American Airlines	307	8%	70.4%	15.3 min	2.3%
UA United Airlines	280	7%	75.7%	11.3 min	0.4%
NK Spirit Airlines	208	5%	69.7%	16.0 min	1.9%
OH PSA Airlines	159	4%	56.6%	33.5 min	3.8%
OO SkyWest Airlines	73	2%	84.9%	2.9 min	1.4%
AS Alaska Airlines	48	1%	75.0%	4.9 min	0.0%
F9 Frontier Airlines	16	0%	50.0%	16.9 min	6.3%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMH–ORD	Columbus to Chicago	416	79.8%	6.3 min	0.7%
CMH–ATL	Columbus to Atlanta	290	78.3%	3.8 min	0.0%
CMH–LGA	Columbus to New York	276	73.2%	14.7 min	1.4%
CMH–MCO	Columbus to Orlando	189	71.4%	12.9 min	1.6%
CMH–DCA	Columbus to Washington	176	62.5%	23.5 min	2.3%
CMH–BOS	Columbus to Boston	173	80.3%	9.0 min	0.0%
CMH–CLT	Columbus to Charlotte	159	68.6%	14.7 min	0.6%
CMH–JFK	Columbus to New York	155	74.2%	12.0 min	1.3%
CMH–DFW	Columbus to Dallas/Fort Worth	154	66.2%	18.2 min	3.2%
CMH–DEN	Columbus to Denver	148	78.4%	8.2 min	0.0%
CMH–DTW	Columbus to Detroit	143	93.7%	-1.6 min	0.0%
CMH–IAD	Columbus to Washington	129	83.7%	4.0 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), May 2025.

Delay causes

BTS cause category	Share of delay minutes	National, May 2025	Minutes
Air carrier	24.4%	29.3%	14,978
Late-arriving aircraft	34.3%	37.8%	21,064
National Aviation System	34.5%	25.9%	21,173
Extreme weather	6.8%	6.9%	4,159
Security	0.0%	0.1%	0

61,374 delay minutes on 848 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 May 2025?

79.0% of 3,851 scheduled domestic departures left less than 15 minutes late, and 76.5% reached their destination on time. The national figures that month were 76.7% and 75.4%.

How does that compare with a year earlier?

In May 2024, 79.0% of 3,580 departures left on time and 1.1% were cancelled, against 79.0% and 1.2% in May 2025.

Provenance

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