Best Time to Fly MDW to JAX: On-Time Stats by Hour & Airline
Chicago Midway International → Jacksonville International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 72.8% of Chicago (MDW) to Jacksonville (JAX) flights arrived on time (416 scheduled flights). That is 4.8 points below 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 (84% on time) and June the worst month (62%).
The cancellation rate was 1.0% (US average 1.8%).
MDW to JAX 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 | 72.8% | 51 min | 1.0% | 416 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to JAX
On-time arrival % by scheduled departure hour (local time), 836 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 7 | |
| 8am–9am | 87.5% | 0.0% | 56 |
| 9am–10am | 84.8% | 1.7% | 60 |
| 10am–11am | 88.6% | 0.0% | 70 |
| 11am–12pm | 76.8% | 1.2% | 84 |
| 12pm–1pm | 85.3% | 0.0% | 75 |
| 1pm–2pm | 80.9% | 0.0% | 163 |
| 2pm–3pm | Limited data | 18 | |
| 3pm–4pm | 87.9% | 0.0% | 33 |
| 5pm–6pm | 74.1% | 0.0% | 59 |
| 6pm–7pm | 57.6% | 0.8% | 119 |
| 7pm–8pm | 69.1% | 4.2% | 71 |
| 8pm–9pm | Limited data | 18 | |
| 9pm–10pm | Limited data | 3 | |
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 JAX
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 | 13 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 66.7% | -14.5 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 67.8% | -13.4 pts | 1.6% | 187 |
| All other days | 81.2% | — | 0.5% | 606 |
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).