Best Time to Fly STL to LAS: On-Time Stats by Hour & Airline
St Louis Lambert International → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
2,094 flights were scheduled from St. Louis (STL) to Las Vegas (LAS) in the last 12 months, and 75.9% of those that flew arrived on time, 1.8 points below the US average of 77.6%.
Among 2 airlines, Frontier Airlines led with 76.3% on time and Southwest Airlines was last with 75.8%.
Over 24 months, Tuesday was the most reliable day (85% on time) and June the worst month (64%).
The cancellation rate was 0.6% (US average 1.8%).
STL 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 |
|---|---|---|---|---|
| Frontier Airlines | 76.3% | 137 min | 2.6% | 309 |
| Southwest Airlines | 75.8% | 53 min | 0.3% | 1,785 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly STL to LAS
On-time arrival % by scheduled departure hour (local time), 4,103 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.7% | 0.0% | 326 |
| 6am–7am | 95.3% | 0.6% | 342 |
| 7am–8am | 90.4% | 0.5% | 209 |
| 8am–9am | 89.1% | 0.5% | 203 |
| 9am–10am | 87.4% | 0.4% | 262 |
| 10am–11am | 85.1% | 1.1% | 88 |
| 11am–12pm | Limited data | 21 | |
| 12pm–1pm | 85.4% | 1.8% | 167 |
| 1pm–2pm | 79.0% | 0.4% | 234 |
| 2pm–3pm | 75.5% | 0.9% | 444 |
| 3pm–4pm | 74.8% | 0.8% | 128 |
| 4pm–5pm | 62.7% | 0.7% | 135 |
| 5pm–6pm | 80.0% | 0.0% | 205 |
| 6pm–7pm | 65.5% | 1.4% | 356 |
| 7pm–8pm | 60.1% | 0.5% | 199 |
| 8pm–9pm | 78.9% | 0.4% | 244 |
| 9pm–10pm | 64.0% | 1.8% | 338 |
| 10pm–11pm | 62.1% | 1.1% | 184 |
| 11pm–12am | Limited data | 18 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on STL 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) | 63.8% | -17.2 pts | 0.0% | 80 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.2% | -6.8 pts | 0.0% | 179 |
| Summer peak (Jun 15 - Aug 15) | 71.5% | -9.5 pts | 1.0% | 706 |
| All other days | 80.9% | — | 0.8% | 3,138 |
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).