Best Time to Fly SLC to MDW: On-Time Stats by Hour & Airline
Salt Lake City International → Chicago Midway International
Data through July 2026 · Last updated October 18, 2026
619 flights were scheduled from Salt Lake City (SLC) to Chicago (MDW) in the last 12 months, and 83.7% of those that flew arrived on time, 6.1 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Friday was the most reliable day (88% on time) and March the worst month (78%).
The cancellation rate was 0.7% (US average 1.8%).
SLC 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 | 83.7% | 33 min | 0.7% | 619 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to MDW
On-time arrival % by scheduled departure hour (local time), 1,276 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.8% | 0.5% | 216 |
| 6am–7am | 95.7% | 2.1% | 96 |
| 7am–8am | 93.2% | 0.0% | 266 |
| 8am–9am | 97.2% | 0.0% | 107 |
| 9am–10am | Limited data | 9 | |
| 10am–11am | Limited data | 9 | |
| 11am–12pm | Limited data | 13 | |
| 12pm–1pm | 89.1% | 0.0% | 55 |
| 1pm–2pm | 73.3% | 0.0% | 228 |
| 2pm–3pm | 74.1% | 1.1% | 174 |
| 3pm–4pm | 74.4% | 0.0% | 86 |
| 4pm–5pm | Limited data | 17 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SLC 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 | 21 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 84.0% | -2.5 pts | 0.0% | 50 |
| Summer peak (Jun 15 - Aug 15) | 85.2% | -1.3 pts | 0.4% | 232 |
| All other days | 86.5% | — | 0.4% | 973 |
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).