Airport month record
CMHSEP
John Glenn Columbus International in September 2025
- Departures
- 3,726
- Month
- September 2025
- National, same month
- 83.4%
- Carriers
- 11
Historical statistics for September 2025, not live status or a forecast for this year’s September. For today’s conditions at CMH, see live FAA status.
CMH in September earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 2 points better than the national rate of 83.4%. When something does go wrong the average delay runs about an hour. That rests on 3,726 flights, of which Southwest Airlines flew 870 at 87.8% on time.
Key figures
On time
85.2%
Arrivals under 15 minutes late, of 3,700 completed departures
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.51%
Nationally in September: 0.51%
Whole year
80.1%
CMH across all twelve months
These figures cover 3,726 departures from John Glenn Columbus International in September 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.
Against the year
September next to CMH's other months
Against CMH's own year, September ran 5 points better than the twelve-month rate of 80.1%, which makes it the best of the twelve months in the data. Cancellations were unusually low for CMH in September, at 0.51% against 2.05% across the year. Either side of it, August ran 82.1% on time and October 81.1%, so a trip moved by a few weeks would have landed in a worse stretch.
| Month | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| July 2025 | 3,933 | 73.3% | 79 min | 3.41% | C− |
| August 2025 | 3,758 | 82.1% | 68 min | 1.41% | B |
| September 2025 (this page) | 3,726 | 85.2% | 67 min | 0.51% | A+ |
| October 2025 | 4,031 | 81.1% | 67 min | 0.72% | B+ |
| November 2025 | 3,641 | 79.9% | 77 min | 1.81% | B |
| December 2025 | 3,567 | 70.7% | 75 min | 1.68% | C |
| January 2026 | 3,296 | 81.6% | 78 min | 6.28% | B− |
| February 2026 | 3,231 | 82.9% | 75 min | 2.72% | B |
| March 2026 | 4,010 | 76.4% | 86 min | 3.24% | B− |
| April 2026 | 3,713 | 84.2% | 72 min | 0.51% | B+ |
| May 2026 | 3,860 | 83.4% | 65 min | 1.22% | B |
| June 2026 | 3,876 | 81.0% | 78 min | 1.57% | B |
Departure window
The best time of day to leave CMH in September
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 20 points, against 2 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am913 flights93.7%
- 8am–11am595 flights93.3%
- 11am–2pm746 flights86.5%
- 2pm–5pm583 flights76.0%
- 5pm–8pm723 flights74.1%
- 8pm–5am166 flights82.9%
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 93.7% of the time, against 74.1% for the evening window. That is 20 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 913 flights scheduled in it.
Across the week, Tuesday is the strongest day at 88.9% on time and Thursday the weakest at 80.7%. 8 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at CMH in September
The two carriers here are closely matched: 2 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways | 1,085 | 85.8% | 67 min | 1.11% | A |
| Southwest Airlines | 870 | 87.8% | 51 min | 0.11% | A+ |
| American Airlinesthin sample | 352 | 86.4% | 111 min | 1.14% | A |
| United Airlinesthin sample | 339 | 76.9% | 56 min | 0.00% | B+ |
| Delta Air Linesthin sample | 332 | 93.1% | 94 min | 0.00% | A+ |
| Envoy Airthin sample | 227 | 88.5% | 89 min | 0.00% | A+ |
| Spirit Airlinesthin sample | 205 | 76.5% | 64 min | 0.49% | B+ |
| PSA Airlinesthin sample | 142 | 77.5% | 58 min | 0.00% | B+ |
| SkyWest Airlinesthin sample | 92 | 76.9% | 56 min | 1.09% | B |
| Alaska Airlinesthin sample | 48 | 89.6% | 52 min | 0.00% | A+ |
| Frontier Airlinesthin sample | 34 | 67.6% | 74 min | 0.00% | C+ |
No carrier stands out. Southwest tops the table at 87.8%, 2 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Route by route
Busiest routes out of CMH in September
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| CMH to ORD · Chicago | 411 | 78.3% | 70 min | 0.24% | B+ |
| CMH to ATL · Atlantathin sample | 277 | 93.5% | 93 min | 0.00% | A+ |
| CMH to LGA · New Yorkthin sample | 260 | 87.8% | 80 min | 1.15% | A |
| CMH to EWR · Newarkthin sample | 200 | 80.9% | 67 min | 3.00% | B |
| CMH to BOS · Bostonthin sample | 180 | 66.1% | 63 min | 1.67% | C |
| CMH to DCA · Washingtonthin sample | 171 | 81.9% | 55 min | 0.00% | B+ |
| CMH to MCO · Orlandothin sample | 168 | 85.1% | 52 min | 0.00% | A+ |
| CMH to CLT · Charlottethin sample | 159 | 91.8% | 59 min | 0.00% | A+ |
| CMH to JFK · New Yorkthin sample | 150 | 91.3% | 73 min | 0.67% | A+ |
| CMH to DEN · Denverthin sample | 146 | 85.5% | 52 min | 0.00% | A+ |
| CMH to IAD · Washingtonthin sample | 136 | 91.2% | 41 min | 0.00% | A+ |
| CMH to DFW · Dallas-Fort Worththin sample | 127 | 87.8% | 148 min | 1.57% | A |
| CMH to PHL · Philadelphiathin sample | 126 | 78.4% | 59 min | 0.79% | B+ |
| CMH to MDW · Chicagothin sample | 115 | 93.9% | 33 min | 0.00% | A+ |
| CMH to MSP · Minneapolisthin sample | 97 | 84.5% | 86 min | 0.00% | B+ |
| CMH to DTW · Detroitthin sample | 95 | 91.6% | 71 min | 0.00% | A+ |
| CMH to BWI · Baltimorethin sample | 90 | 88.9% | 49 min | 0.00% | A+ |
| CMH to BNA · Nashvillethin sample | 88 | 87.5% | 44 min | 0.00% | A+ |
| CMH to LAS · Las Vegasthin sample | 84 | 81.0% | 44 min | 0.00% | B+ |
| CMH to PHX · Phoenixthin sample | 73 | 87.3% | 117 min | 1.37% | A |
| CMH to FLL · Fort Lauderdalethin sample | 67 | 79.1% | 55 min | 0.00% | B+ |
| CMH to TPA · Tampathin sample | 62 | 96.8% | 71 min | 0.00% | A+ |
| CMH to MIA · Miamithin sample | 60 | 90.0% | 49 min | 0.00% | A+ |
| CMH to STL · St. Louisthin sample | 56 | 94.5% | 38 min | 1.79% | A |
| CMH to IAH · Houstonthin sample | 56 | 76.8% | 113 min | 0.00% | B+ |
Delay causes
What held CMH up in September
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 37,000 reported delay minutes.
- 34%Carrier
- 32%Late-arriving aircraft
- 30%National Airspace System
- 3%Extreme weather
- 0%Security
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 93.7% on time here. The split is drawn from 36,833 reported delay minutes.
Cancellations are rare at 0.51%, below the national 0.51% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
5.0% of arrivals land an hour or more late, close to the national 5.4%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
What to do with this
Flying from CMH in September
For a September trip through CMH: this is one of the better months to be flying from here, 85.2% on time with 0.51% cancelled. That is a base rate for the month as a whole; a single storm can still spoil a particular day.
Related
Where to go next
- John Glenn Columbus International (CMH), the whole year
- CMH in July73.3%
- CMH in August82.1%
- CMH in October81.1%
- CMH in November79.9%
- CMH in December70.7%
- CMH in January81.6%
- CMH in February82.9%
- CMH in March76.4%
- CMH in April84.2%
- CMH in May83.4%
- CMH in June81.0%
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.