FlightRecord

John Glenn Columbus International Airport (CMH): Delays & On-Time Performance

Data through May 2026

John Glenn Columbus International Airport (CMH) is a tale of two seasons: departures ran 90% on-time in October 2024 but sank to 73% in July 2025. Across the year it averages 82% against a national 78%, over roughly 122 departures a day to 46 destinations.

Departures on-time
82%
left <15 min late
Avg dep delay
14 min
Arrivals on-time
78%
Cancelled
1.7%
Destinations
46
nonstop
Airlines
12

Monthly on-time trend

Monthly departure on-time percentage at CMH50%75%100%June 2024: 82% on-time (3,629 flights)82Jun 2024July 2024: 78% on-time (3,797 flights)78August 2024: 81% on-time (3,707 flights)81September 2024: 89% on-time (3,549 flights)89Sep 2024October 2024: 90% on-time (3,849 flights)90November 2024: 89% on-time (3,610 flights)89December 2024: 81% on-time (3,528 flights)81Dec 2024January 2025: 85% on-time (3,283 flights)85February 2025: 85% on-time (3,103 flights)85March 2025: 84% on-time (3,760 flights)84Mar 2025April 2025: 84% on-time (3,824 flights)84May 2025: 80% on-time (3,851 flights)80June 2025: 76% on-time (3,926 flights)76Jun 2025July 2025: 73% on-time (3,933 flights)73August 2025: 84% on-time (3,758 flights)84September 2025: 85% on-time (3,726 flights)85Sep 2025October 2025: 83% on-time (4,031 flights)83November 2025: 82% on-time (3,641 flights)82December 2025: 73% on-time (3,567 flights)73Dec 2025January 2026: 83% on-time (3,296 flights)83February 2026: 82% on-time (3,231 flights)82March 2026: 76% on-time (4,010 flights)76Mar 2026April 2026: 85% on-time (3,713 flights)85May 2026: 84% on-time (3,860 flights)84

Best time of day to depart from CMH

On-time percentage by scheduled departure hour at CMH5 a.m.: 94% on-time (3,994 flights)56 a.m.: 93% on-time (12,227 flights)67 a.m.: 90% on-time (8,350 flights)78 a.m.: 90% on-time (6,371 flights)89 a.m.: 90% on-time (3,239 flights)910 a.m.: 88% on-time (4,972 flights)1011 a.m.: 85% on-time (5,684 flights)1112 p.m.: 81% on-time (4,992 flights)121 p.m.: 82% on-time (3,822 flights)132 p.m.: 78% on-time (4,910 flights)143 p.m.: 74% on-time (4,740 flights)154 p.m.: 73% on-time (4,949 flights)165 p.m.: 72% on-time (6,060 flights)176 p.m.: 70% on-time (6,204 flights)187 p.m.: 69% on-time (4,307 flights)198 p.m.: 64% on-time (2,422 flights)209 p.m.: 65% on-time (915 flights)21scheduled departure hour

Busiest routes from CMH

RouteFlights/12moOn-timeAvg delay
CMH → ORD4,79176%21 min
CMH → ATL3,19986%12 min
CMH → LGA3,09981%14 min
CMH → MCO2,22181%15 min
CMH → DCA2,05673%20 min
CMH → CLT2,02780%19 min
CMH → BOS2,00384%11 min
CMH → EWR1,99583%12 min

Most reliable routes

  1. CMH → SLC91%
  2. CMH → BWI89%
  3. CMH → DTW86%
  4. CMH → ATL86%
  5. CMH → IAD85%

Most delay-prone routes

  1. CMH → SFO64%
  2. CMH → SAN66%
  3. CMH → DCA73%
  4. CMH → SEA74%
  5. CMH → IAH76%

Airline performance at CMH

AirlineOn-time departuresAvg delayFlights
Delta Air Lines87%11 min7,335
Republic Airways87%10 min24,932
Envoy Air84%15 min6,397
American Airlines81%23 min7,793
Southwest Airlines80%13 min24,260
United Airlines78%18 min5,943
SkyWest Airlines77%25 min2,460
PSA Airlines76%23 min3,382
Spirit Airlines76%19 min3,935
Alaska Airlines74%13 min930
Frontier Airlines69%25 min718

Frequently asked questions

How often are flights delayed at CMH?
18% of departures from John Glenn Columbus International Airport left 15+ minutes late between 2024-06 and 2026-05, with an average departure delay of 14 minutes. The national on-time average over the same period was 78%.
What is the best time of day to depart from CMH?
Flights scheduled around 5 a.m. depart on time 94% of the time at CMH, versus 64% around 8 p.m.. Booking before noon is the usual rule of thumb here.
What is the worst month for delays at CMH?
In this dataset, July 2025 was the weakest month at CMH, with 73% of departures on time.
How often are flights cancelled at CMH?
1.7% of scheduled departures from CMH were cancelled in this period, compared with a national rate of 1.6%.

Popular route pages from this airport

Based on 88,182 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.