Best Time to Fly MDW to SLC: On-Time Stats by Hour & Airline
Chicago Midway International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 70.0% of Chicago (MDW) to Salt Lake City (SLC) flights arrived on time (619 scheduled flights). That is 7.7 points below the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (79% on time) and June the worst month (59%).
The cancellation rate was 1.9% (US average 1.8%).
MDW to SLC 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 | 70.0% | 42 min | 1.9% | 619 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to SLC
On-time arrival % by scheduled departure hour (local time), 1,277 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 73.9% | 1.1% | 89 |
| 8am–9am | 86.9% | 0.0% | 236 |
| 9am–10am | 88.1% | 0.0% | 126 |
| 10am–11am | 75.8% | 0.0% | 198 |
| 11am–12pm | Limited data | 17 | |
| 12pm–1pm | Limited data | 27 | |
| 1pm–2pm | Limited data | 6 | |
| 2pm–3pm | 80.0% | 0.0% | 35 |
| 3pm–4pm | Limited data | 2 | |
| 4pm–5pm | Limited data | 25 | |
| 5pm–6pm | Limited data | 28 | |
| 6pm–7pm | Limited data | 10 | |
| 7pm–8pm | Limited data | 21 | |
| 8pm–9pm | 70.5% | 3.0% | 133 |
| 9pm–10pm | 61.0% | 2.8% | 211 |
| 10pm–11pm | 65.2% | 0.9% | 113 |
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 SLC
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) | 62.0% | -17.0 pts | 0.0% | 50 |
| Summer peak (Jun 15 - Aug 15) | 63.8% | -15.3 pts | 1.3% | 232 |
| All other days | 79.0% | — | 0.9% | 974 |
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).