Best Time to Fly MDW to LAS: On-Time Stats by Hour & Airline
Chicago Midway International → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.7% of Chicago (MDW) to Las Vegas (LAS) flights arrived on time (2,273 scheduled flights). That is 0.9 points below the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
October has been the best month (87% on time) and Friday the weakest day of the week (76%).
0.8% of flights were cancelled, versus 1.8% nationally.
MDW to LAS 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 | 76.7% | 51 min | 0.8% | 2,271 |
| Allegiant Air | Limited data | 2 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to LAS
On-time arrival % by scheduled departure hour (local time), 5,096 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 92.7% | 0.0% | 342 |
| 6am–7am | 93.8% | 0.3% | 322 |
| 7am–8am | 91.0% | 0.2% | 413 |
| 8am–9am | 89.3% | 0.0% | 308 |
| 9am–10am | 87.1% | 0.8% | 391 |
| 10am–11am | 82.6% | 0.5% | 196 |
| 11am–12pm | 82.0% | 0.3% | 306 |
| 12pm–1pm | 81.2% | 1.2% | 340 |
| 1pm–2pm | 76.4% | 0.4% | 261 |
| 2pm–3pm | 75.3% | 0.6% | 167 |
| 3pm–4pm | 69.2% | 0.8% | 249 |
| 4pm–5pm | 71.6% | 1.1% | 287 |
| 5pm–6pm | 74.0% | 0.9% | 336 |
| 6pm–7pm | 66.7% | 0.0% | 250 |
| 7pm–8pm | 73.1% | 1.0% | 206 |
| 8pm–9pm | 67.7% | 0.8% | 380 |
| 9pm–10pm | 65.4% | 2.1% | 186 |
| 10pm–11pm | 68.6% | 1.9% | 156 |
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 LAS
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) | 76.7% | -4.9 pts | 5.4% | 92 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.7% | -12.9 pts | 0.0% | 202 |
| Summer peak (Jun 15 - Aug 15) | 73.9% | -7.7 pts | 0.9% | 931 |
| All other days | 81.6% | — | 0.5% | 3,871 |
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).