Best Time to Fly SJC to MDW: On-Time Stats by Hour & Airline
Norman Y. Mineta San Jose International → Chicago Midway International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.2% of San Jose (SJC) to Chicago (MDW) flights arrived on time (519 scheduled flights). That is 6.6 points above the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (91% on time) and May the worst month (69%).
The cancellation rate was 0.2% (US average 1.8%).
SJC 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 | 84.2% | 32 min | 0.2% | 519 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SJC to MDW
On-time arrival % by scheduled departure hour (local time), 1,060 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 93.7% | 0.0% | 174 |
| 7am–8am | 94.0% | 0.8% | 119 |
| 8am–9am | 91.8% | 0.0% | 124 |
| 9am–10am | 87.0% | 0.0% | 54 |
| 10am–11am | 78.1% | 0.0% | 97 |
| 11am–12pm | 74.1% | 0.4% | 228 |
| 12pm–1pm | Limited data | 23 | |
| 1pm–2pm | 65.2% | 0.0% | 46 |
| 2pm–3pm | Limited data | 18 | |
| 6pm–7pm | Limited data | 28 | |
| 10pm–11pm | 94.0% | 0.0% | 149 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SJC 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) | Limited data | 14 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 86.7% | -0.9 pts | 0.0% | 30 |
| Summer peak (Jun 15 - Aug 15) | 78.0% | -9.6 pts | 0.4% | 272 |
| All other days | 87.5% | — | 0.1% | 744 |
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).