Best Time to Fly MDW to DEN: On-Time Stats by Hour & Airline
Chicago Midway International → Denver International
Data through July 2026 · Last updated October 18, 2026
2,271 flights were scheduled from Chicago (MDW) to Denver (DEN) in the last 12 months, and 74.4% of those that flew arrived on time, 3.3 points below the US average of 77.6%.
Among 2 airlines, Southwest Airlines led with 74.5% on time and Frontier Airlines was last with 68.6%.
Over 24 months, Wednesday was the most reliable day (83% on time) and June the worst month (65%).
The cancellation rate was 1.3% (US average 1.8%).
MDW to DEN 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 | 74.5% | 59 min | 1.3% | 2,198 |
| Frontier Airlines | 68.6% | 62 min | 1.4% | 73 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to DEN
On-time arrival % by scheduled departure hour (local time), 5,202 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.4% | 0.3% | 369 |
| 6am–7am | 89.7% | 1.4% | 345 |
| 7am–8am | 87.1% | 0.3% | 342 |
| 8am–9am | 84.3% | 0.7% | 302 |
| 9am–10am | 88.0% | 1.4% | 347 |
| 10am–11am | 84.4% | 1.0% | 304 |
| 11am–12pm | 81.8% | 0.7% | 305 |
| 12pm–1pm | 83.0% | 1.2% | 341 |
| 1pm–2pm | 87.1% | 0.6% | 179 |
| 2pm–3pm | 70.2% | 1.5% | 324 |
| 3pm–4pm | 70.0% | 0.4% | 233 |
| 4pm–5pm | 59.9% | 1.6% | 309 |
| 5pm–6pm | 60.3% | 0.8% | 368 |
| 6pm–7pm | 56.6% | 1.7% | 231 |
| 7pm–8pm | 71.3% | 1.6% | 184 |
| 8pm–9pm | 73.9% | 0.3% | 300 |
| 9pm–10pm | 60.1% | 1.8% | 222 |
| 10pm–11pm | 70.8% | 2.5% | 197 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MDW to DEN
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) | 76.6% | -3.8 pts | 4.3% | 116 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.5% | -9.9 pts | 0.9% | 229 |
| Summer peak (Jun 15 - Aug 15) | 68.0% | -12.3 pts | 1.2% | 1,069 |
| All other days | 80.3% | — | 0.9% | 3,788 |
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).