John Glenn Columbus International in May 2026

82.8%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 May 2026, reporting carriers scheduled 3,860 domestic departures from John Glenn Columbus International (CMH). 82.8% left less than 15 minutes late and 82.2% reached their destination on time; 1.2% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so CMH departures were 5.7 points above the national departure figure.

A year earlier, in May 2025, the airport had 3,851 departures with 79.0% leaving on time: a change of +3.8 points, with flights up 0%.

Flights arriving at CMH that month were on time 78.7% of the time (3,862 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 43%, national aviation system 28% and air carrier 27%.

On time 82.2%
Arrived 15+ minutes late 16.3%
Cancelled 1.2%
Diverted 0.2%

Every scheduled departure from CMH 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	CMH, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	82.8%	79.0%	79.6%	77.1%
Arrived on time	82.2%	76.5%	79.0%	77.6%
Cancelled	1.2%	1.2%	2.0%	0.9%
Average departure delay (late minutes only)	11.8 min	15.9 min	15.0 min	16.0 min
Scheduled departures a day	129	128	123	20,391
Scheduled departures	3,860	3,851	44,711	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	1,111	29%	87.3%	-5.6 min	1.4%
WN Southwest Airlines	1,045	27%	77.7%	5.4 min	0.5%
AA American Airlines	383	10%	80.9%	4.4 min	2.1%
DL Delta Air Lines	367	10%	89.6%	-7.0 min	1.4%
UA United Airlines	322	8%	73.3%	13.7 min	1.2%
MQ Envoy Air	242	6%	88.8%	-10.8 min	0.4%
OH PSA Airlines	163	4%	79.1%	3.5 min	1.8%
OO SkyWest Airlines	135	3%	80.7%	5.8 min	2.2%
F9 Frontier Airlines	46	1%	67.4%	2.1 min	2.2%
AS Alaska Airlines	44	1%	72.7%	7.3 min	0.0%
NK Spirit Airlines	2	0%	50.0%	-26.0 min	50.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMH–ORD	Columbus to Chicago	459	82.8%	1.9 min	1.3%
CMH–ATL	Columbus to Atlanta	270	85.6%	-2.6 min	1.9%
CMH–LGA	Columbus to New York	251	83.3%	-1.7 min	2.4%
CMH–CLT	Columbus to Charlotte	195	85.1%	-6.7 min	0.5%
CMH–EWR	Columbus to Newark	179	87.7%	-6.2 min	2.2%
CMH–DCA	Columbus to Washington	178	71.9%	12.3 min	1.1%
CMH–BOS	Columbus to Boston	168	86.9%	-9.7 min	0.6%
CMH–DEN	Columbus to Denver	152	81.6%	1.5 min	0.0%
CMH–DFW	Columbus to Dallas/Fort Worth	152	72.4%	10.6 min	3.9%
CMH–MCO	Columbus to Orlando	152	76.3%	1.2 min	2.0%
CMH–DTW	Columbus to Detroit	150	90.0%	-5.8 min	0.7%
CMH–PHL	Columbus to Philadelphia	138	84.1%	3.6 min	1.4%

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	26.7%	33.0%	10,991
Late-arriving aircraft	42.7%	40.4%	17,573
National Aviation System	27.8%	20.5%	11,442
Extreme weather	2.8%	6.0%	1,143
Security	0.0%	0.1%	3

41,152 delay minutes on 631 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 2026?

82.8% of 3,860 scheduled domestic departures left less than 15 minutes late, and 82.2% 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, 79.0% of 3,851 departures left on time and 1.2% were cancelled, against 82.8% and 1.2% 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 CMH · methodology · corrections.