Best Time to Fly CMH to STL: On-Time Stats by Hour & Airline
John Glenn Columbus International → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.6% of Columbus (CMH) to St. Louis (STL) flights arrived on time (673 scheduled flights). That is 6.9 points above the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (90% on time) and July the worst month (75%).
The cancellation rate was 0.7% (US average 1.8%).
CMH to STL on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 84.6% | 65 min | 0.7% | 673 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CMH to STL
On-time arrival % by scheduled departure hour (local time), 1,342 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 1 | |
| 6am–7am | 90.3% | 2.7% | 74 |
| 7am–8am | 96.8% | 0.0% | 185 |
| 8am–9am | 96.6% | 0.4% | 237 |
| 9am–10am | 94.2% | 1.3% | 158 |
| 10am–11am | Limited data | 3 | |
| 11am–12pm | Limited data | 12 | |
| 12pm–1pm | Limited data | 14 | |
| 1pm–2pm | Limited data | 6 | |
| 2pm–3pm | Limited data | 1 | |
| 3pm–4pm | Limited data | 14 | |
| 4pm–5pm | Limited data | 15 | |
| 6pm–7pm | 90.1% | 1.0% | 102 |
| 7pm–8pm | 75.8% | 1.5% | 134 |
| 8pm–9pm | 71.4% | 1.3% | 235 |
| 9pm–10pm | 69.3% | 0.7% | 151 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on CMH to STL
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 26 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 75.5% | -11.8 pts | 0.0% | 53 |
| Summer peak (Jun 15 - Aug 15) | 78.2% | -9.1 pts | 0.4% | 231 |
| All other days | 87.2% | — | 1.1% | 1,032 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).