Airport month record
CMHJUN
John Glenn Columbus International in June 2026
- Departures
- 3,876
- Month
- June 2026
- National, same month
- 74.3%
- Carriers
- 10
Historical statistics for June 2026, not live status or a forecast for this year’s June. For today’s conditions at CMH, see live FAA status.
CMH in June lands a B, 7 points better than the national rate of 74.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 3,876 flights, of which Delta Air Lines flew 373 at 89.4% on time.
Delta Air Lines is the most reliable of the four carriers covered here at 89.4% on time across 373 flights.
Key figures
On time
81.0%
Arrivals under 15 minutes late, of 3,799 completed departures
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
1.57%
Nationally in June: 1.65%
Whole year
80.1%
CMH across all twelve months
These figures cover 3,876 departures from John Glenn Columbus International in June 2026. 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
June next to CMH's other months
Against CMH's own year, June ran level with the twelve-month rate of 80.1%, which makes it number eight of twelve months, best first.
| 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 | 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 (this page) | 3,876 | 81.0% | 78 min | 1.57% | B |
Departure window
The best time of day to leave CMH in June
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 26 points, against 14 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,070 flights91.8%
- 8am–11am701 flights91.4%
- 11am–2pm577 flights78.1%
- 2pm–5pm671 flights72.4%
- 5pm–8pm652 flights66.0%
- 8pm–5am205 flights71.4%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 91.8% of the time, against 66.0% for the evening window. That is 26 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 1,070 flights scheduled in it.
Across the week, Tuesday is the strongest day at 87.2% on time and Sunday the weakest at 76.0%. 11 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at CMH in June
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 89.4% of the time; Southwest Airlines manages 75.9%. Sample sizes sit next to every figure, because a two-point gap across 1,033 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways | 1,121 | 86.0% | 77 min | 2.59% | A |
| Southwest Airlines | 1,033 | 75.9% | 53 min | 0.19% | B+ |
| American Airlines | 377 | 79.8% | 117 min | 2.65% | B |
| Delta Air Lines | 373 | 89.4% | 96 min | 1.07% | A |
| United Airlinesthin sample | 293 | 71.4% | 96 min | 1.37% | C |
| Envoy Airthin sample | 253 | 82.6% | 100 min | 1.58% | B |
| PSA Airlinesthin sample | 165 | 83.9% | 72 min | 2.42% | B |
| SkyWest Airlinesthin sample | 150 | 83.8% | 82 min | 1.33% | B |
| Alaska Airlinesthin sample | 57 | 77.2% | 41 min | 0.00% | B+ |
| Frontier Airlinesthin sample | 54 | 57.7% | 120 min | 3.70% | D− |
The spread between Delta and Southwest is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.
Route by route
Busiest routes out of CMH in June
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| CMH to ORD · Chicago | 450 | 79.0% | 96 min | 3.33% | B− |
| CMH to ATL · Atlantathin sample | 270 | 85.4% | 88 min | 1.11% | A |
| CMH to LGA · New Yorkthin sample | 220 | 85.4% | 67 min | 3.18% | A− |
| CMH to DCA · Washingtonthin sample | 176 | 76.8% | 75 min | 3.41% | B− |
| CMH to EWR · Newarkthin sample | 176 | 84.4% | 80 min | 1.14% | B |
| CMH to DTW · Detroitthin sample | 173 | 91.3% | 86 min | 0.00% | A+ |
| CMH to CLT · Charlottethin sample | 170 | 86.3% | 106 min | 1.18% | A |
| CMH to BOS · Bostonthin sample | 169 | 90.5% | 77 min | 0.00% | A+ |
| CMH to PHL · Philadelphiathin sample | 168 | 84.6% | 106 min | 3.57% | B− |
| CMH to DEN · Denverthin sample | 157 | 79.1% | 87 min | 0.00% | B+ |
| CMH to DFW · Dallas-Fort Worththin sample | 150 | 73.0% | 99 min | 4.00% | C− |
| CMH to MCO · Orlandothin sample | 140 | 71.6% | 63 min | 1.43% | C |
| CMH to JFK · New Yorkthin sample | 114 | 83.0% | 95 min | 7.02% | B− |
| CMH to MDW · Chicagothin sample | 113 | 79.3% | 62 min | 1.77% | B |
| CMH to MIA · Miamithin sample | 110 | 90.0% | 87 min | 0.00% | A+ |
| CMH to MSP · Minneapolisthin sample | 110 | 86.2% | 93 min | 0.91% | A+ |
| CMH to BNA · Nashvillethin sample | 102 | 83.3% | 50 min | 0.00% | B+ |
| CMH to PHX · Phoenixthin sample | 95 | 75.8% | 63 min | 0.00% | B+ |
| CMH to BWI · Baltimorethin sample | 86 | 82.6% | 65 min | 0.00% | B+ |
| CMH to TPA · Tampathin sample | 69 | 78.3% | 60 min | 0.00% | B+ |
| CMH to LAS · Las Vegasthin sample | 67 | 77.6% | 37 min | 0.00% | B+ |
| CMH to LAX · Los Angelesthin sample | 60 | 70.0% | 87 min | 0.00% | C+ |
| CMH to SEA · Seattlethin sample | 57 | 77.2% | 41 min | 0.00% | B+ |
| CMH to STL · St. Louisthin sample | 56 | 87.5% | 55 min | 0.00% | A+ |
| CMH to DAL · Dallasthin sample | 54 | 71.7% | 42 min | 0.00% | C+ |
Delay causes
What held CMH up in June
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 56,000 reported delay minutes.
- 41%Late-arriving aircraft
- 29%Carrier
- 28%National Airspace System
- 2%Extreme weather
- 0%Security
41% 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 56,000 reported delay minutes here, that single category outweighs weather by 21 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 56,228 reported delay minutes.
Cancellations sit at 1.57% against a national 1.65%, which is ordinary. Diversions add another 0.41%.
7.6% of arrivals land an hour or more late, close to the national 9.7%. 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 a little over an hour, which a normal layover absorbs.
What to do with this
Flying from CMH in June
For a June trip through CMH: expect 81.0% on time and 1.57% cancelled, going by June 2026. The 5am–8am window was the strongest part of the day.
Related
Where to go next
- John Glenn Columbus International (CMH), the whole year
- CMH in July73.3%
- 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%
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.