Chicago Midway International (MDW) Delays and On-Time Departures
Chicago, IL · ranked 316th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
71.8% of the 73,744 flights scheduled to depart Chicago (MDW) in the last 12 months left on time, 5.6 points below the US average of 77.4%.
That ranks 316th of 333 US airports tracked on this site, with 1.5% of departures cancelled.
Among airlines at Chicago (MDW), Delta Air Lines left on time most often (84.1%).
Over 24 months, Wednesday was the most reliable day (79% on time) and July the worst month (61%).
Best time of day to fly out of Chicago (MDW)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 93.9% | 0.7% | 4,745 |
| 6am–7am | 94.3% | 1.1% | 6,406 |
| 7am–8am | 89.6% | 0.8% | 9,714 |
| 8am–9am | 88.1% | 0.7% | 11,676 |
| 9am–10am | 84.6% | 1.1% | 11,960 |
| 10am–11am | 84.6% | 0.9% | 10,517 |
| 11am–12pm | 76.3% | 1.0% | 6,800 |
| 12pm–1pm | 77.2% | 1.3% | 8,637 |
| 1pm–2pm | 76.9% | 1.0% | 10,349 |
| 2pm–3pm | 70.9% | 1.2% | 7,827 |
| 3pm–4pm | 68.7% | 1.1% | 6,542 |
| 4pm–5pm | 67.3% | 1.0% | 6,393 |
| 5pm–6pm | 62.9% | 1.5% | 8,322 |
| 6pm–7pm | 62.4% | 1.5% | 11,397 |
| 7pm–8pm | 62.7% | 1.6% | 7,534 |
| 8pm–9pm | 62.4% | 1.3% | 10,366 |
| 9pm–10pm | 50.1% | 2.1% | 7,079 |
| 10pm–11pm | 53.7% | 1.8% | 3,055 |
Airlines at MDW ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| Delta Air Lines | 84.1% | 87.5% | 2.8% | 1,362 |
| Frontier Airlines | 81.1% | 74.2% | 2.2% | 1,748 |
| SkyWest Airlines | 80.3% | 80.0% | 1.3% | 1,007 |
| Allegiant Air | 72.6% | 71.5% | 0.3% | 322 |
| Southwest Airlines | 71.2% | 75.1% | 1.5% | 69,305 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of MDW
On-time departures by day, 24 months.
Best month to fly out of MDW
On-time departures by month, 24 months.
Holiday travel at Chicago (MDW)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 76.7% | -1.3 pts | 4.9% | 2,739 |
| Christmas & New Year (Dec 20 - Jan 3) | 67.0% | -11.0 pts | 0.5% | 5,789 |
| Summer peak (Jun 15 - Aug 15) | 63.0% | -15.0 pts | 1.5% | 29,418 |
| All other days | 78.0% | — | 1.0% | 111,373 |
Monthly on-time departure trend at MDW
On-time departure % each month, with the 12-month US average for reference.
Routes from Chicago (MDW)
Every route from MDW with its own page, by number of flights (last 12 months, on-time arrivals).