Airport month record
CMHJUL
John Glenn Columbus International in July 2025
- Departures
- 3,933
- Month
- July 2025
- National, same month
- 71.1%
- Carriers
- 11
Historical statistics for July 2025, not live status or a forecast for this year’s July. For today’s conditions at CMH, see live FAA status.
CMH in July carries a cancellation problem, not just a delay problem: 3.4% of scheduled flights never operate, against 2.5% nationally. Of the ones that do fly, close to three flights in four arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 3,933 flights, of which Delta Air Lines flew 399 at 82.2% on time.
Delta Air Lines is the most reliable of the three carriers covered here at 82.2% on time across 399 flights.
Key figures
On time
73.3%
Arrivals under 15 minutes late, of 3,775 completed departures
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
3.41%
Nationally in July: 2.45%
Whole year
80.1%
CMH across all twelve months
These figures cover 3,933 departures from John Glenn Columbus International in July 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
July next to CMH's other months
Against CMH's own year, July ran 7 points worse than the twelve-month rate of 80.1%, which makes it number eleven of twelve months, best first. Cancellations are where July stands out: 3.41% of scheduled departures were called off, 1.7 times the airport's rate across the year.
| Month | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| July 2025 (this page) | 3,933 | 73.3% | 79 min | 3.41% | C− |
| August 2025 | 3,758 | 82.1% | 68 min | 1.41% | B |
| September 2025 | 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 July
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 37 points, against 9 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,107 flights90.1%
- 8am–11am602 flights85.5%
- 11am–2pm582 flights77.2%
- 2pm–5pm638 flights57.7%
- 5pm–8pm787 flights53.1%
- 8pm–5am217 flights55.2%
Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 53.1% on time, against 90.1% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 1,107 flights scheduled in it.
Across the week, Tuesday is the strongest day at 78.8% on time and Sunday the weakest at 66.9%. 12 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at CMH in July
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 82.2% of the time; Southwest Airlines manages 73.6%. Sample sizes sit next to every figure, because a two-point gap across 1,092 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 1,092 | 73.6% | 66 min | 1.28% | C |
| Republic Airways | 1,055 | 77.8% | 80 min | 6.54% | B− |
| Delta Air Lines | 399 | 82.2% | 70 min | 1.00% | B |
| American Airlinesthin sample | 355 | 72.1% | 80 min | 4.23% | C− |
| United Airlinesthin sample | 260 | 60.3% | 85 min | 0.38% | D+ |
| Envoy Airthin sample | 255 | 73.1% | 97 min | 0.39% | C+ |
| Spirit Airlinesthin sample | 154 | 72.1% | 67 min | 4.55% | C− |
| PSA Airlinesthin sample | 146 | 62.9% | 129 min | 9.59% | D− |
| SkyWest Airlinesthin sample | 124 | 58.6% | 106 min | 6.45% | D− |
| Alaska Airlinesthin sample | 61 | 65.0% | 48 min | 1.64% | C |
| Frontier Airlinesthin sample | 32 | 53.1% | 71 min | 0.00% | F+ |
Republic Airways cancels 6.5% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Route by route
Busiest routes out of CMH in July
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| CMH to ORD · Chicago | 398 | 65.3% | 102 min | 2.26% | C |
| CMH to ATL · Atlantathin sample | 299 | 81.4% | 71 min | 0.33% | B+ |
| CMH to LGA · New Yorkthin sample | 252 | 75.0% | 77 min | 13.49% | B− |
| CMH to DCA · Washingtonthin sample | 180 | 61.6% | 109 min | 10.56% | D− |
| CMH to MCO · Orlandothin sample | 178 | 73.1% | 74 min | 0.56% | C+ |
| CMH to BOS · Bostonthin sample | 172 | 82.4% | 95 min | 0.58% | B+ |
| CMH to CLT · Charlottethin sample | 165 | 85.1% | 81 min | 2.42% | A |
| CMH to DEN · Denverthin sample | 163 | 70.7% | 76 min | 0.61% | C+ |
| CMH to EWR · Newarkthin sample | 160 | 72.4% | 75 min | 8.75% | C− |
| CMH to JFK · New Yorkthin sample | 154 | 75.4% | 76 min | 6.49% | B− |
| CMH to DFW · Dallas-Fort Worththin sample | 153 | 73.8% | 70 min | 3.27% | C− |
| CMH to MDW · Chicagothin sample | 131 | 71.5% | 72 min | 0.76% | C+ |
| CMH to PHL · Philadelphiathin sample | 127 | 53.4% | 76 min | 7.87% | F− |
| CMH to DTW · Detroitthin sample | 123 | 82.0% | 98 min | 0.81% | B+ |
| CMH to MSP · Minneapolisthin sample | 116 | 72.6% | 60 min | 2.59% | C |
| CMH to PHX · Phoenixthin sample | 114 | 84.1% | 123 min | 0.88% | B+ |
| CMH to FLL · Fort Lauderdalethin sample | 94 | 75.3% | 62 min | 1.06% | B |
| CMH to BWI · Baltimorethin sample | 92 | 83.5% | 69 min | 7.61% | B− |
| CMH to BNA · Nashvillethin sample | 88 | 73.6% | 50 min | 1.14% | C |
| CMH to IAD · Washingtonthin sample | 85 | 74.0% | 132 min | 9.41% | C− |
| CMH to MIA · Miamithin sample | 82 | 71.6% | 65 min | 0.00% | C+ |
| CMH to LAS · Las Vegasthin sample | 78 | 75.6% | 47 min | 0.00% | B+ |
| CMH to TPA · Tampathin sample | 70 | 75.7% | 60 min | 0.00% | B+ |
| CMH to SEA · Seattlethin sample | 61 | 65.0% | 48 min | 1.64% | C |
| CMH to STL · St. Louisthin sample | 57 | 73.7% | 65 min | 0.00% | C+ |
Delay causes
What held CMH up in July
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 80,000 reported delay minutes.
- 36%Late-arriving aircraft
- 28%Carrier
- 26%National Airspace System
- 9%Extreme weather
- 0%Security
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 80,000 reported delay minutes here, that single category outweighs weather by 4 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 79,860 reported delay minutes.
Cancellations run at 3.41%, against 2.45% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.5% of arrivals land a full hour or more behind schedule, against 12.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
What to do with this
Flying from CMH in July
For a July trip through CMH: plan on this being one of the airport's harder months. The 5am–8am departures held up best at 90.1% on time, and with 11.5% of arrivals an hour or more late, a connection here deserves more slack than the same trip in September would.
Related
Where to go next
- John Glenn Columbus International (CMH), the whole year
- CMH in August82.1%
- CMH in September85.2%
- 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.