Best Time to Fly CMH to MDW: On-Time Stats by Hour & Airline
John Glenn Columbus International → Chicago Midway International
Data through July 2026 · Last updated October 18, 2026
1,239 flights were scheduled from Columbus (CMH) to Chicago (MDW) in the last 12 months, and 81.3% of those that flew arrived on time, 3.6 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (91% on time) and July the worst month (73%).
The cancellation rate was 1.6% (US average 1.8%).
CMH to MDW 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 | 81.3% | 58 min | 1.6% | 1,239 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CMH to MDW
On-time arrival % by scheduled departure hour (local time), 2,501 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 92.9% | 1.2% | 400 |
| 7am–8am | 94.5% | 0.7% | 147 |
| 8am–9am | 90.2% | 0.7% | 154 |
| 9am–10am | 88.9% | 1.8% | 110 |
| 10am–11am | 96.4% | 0.0% | 56 |
| 11am–12pm | 91.6% | 1.2% | 84 |
| 12pm–1pm | 85.2% | 1.1% | 178 |
| 1pm–2pm | 94.4% | 0.9% | 108 |
| 2pm–3pm | 89.8% | 0.9% | 109 |
| 3pm–4pm | 80.5% | 2.2% | 183 |
| 4pm–5pm | 79.5% | 0.9% | 217 |
| 5pm–6pm | 75.9% | 0.0% | 87 |
| 6pm–7pm | 79.5% | 1.3% | 158 |
| 7pm–8pm | 76.8% | 1.3% | 231 |
| 8pm–9pm | 57.1% | 0.0% | 241 |
| 9pm–10pm | 63.6% | 2.9% | 34 |
| 10pm–11pm | Limited data | 4 | |
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 MDW
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) | 73.9% | -11.3 pts | 4.2% | 48 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.7% | -9.5 pts | 0.0% | 107 |
| Summer peak (Jun 15 - Aug 15) | 78.2% | -7.0 pts | 1.2% | 499 |
| All other days | 85.2% | — | 1.0% | 1,847 |
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).