Best Time to Fly LAS to STL: On-Time Stats by Hour & Airline
Harry Reid International → St Louis Lambert International
Data through July 2026 · Last updated October 18, 2026
2,101 flights were scheduled from Las Vegas (LAS) to St. Louis (STL) in the last 12 months, and 78.6% of those that flew arrived on time, 1.0 points above the US average of 77.6%.
Among 2 airlines, Frontier Airlines led with 83.4% on time and Southwest Airlines was last with 77.8%.
Over 24 months, Tuesday was the most reliable day (87% on time) and July the worst month (70%).
The cancellation rate was 0.4% (US average 1.8%).
LAS to STL 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 | 83.4% | 77 min | 1.9% | 309 |
| Southwest Airlines | 77.8% | 53 min | 0.1% | 1,792 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LAS to STL
On-time arrival % by scheduled departure hour (local time), 4,110 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.8% | 0.4% | 242 |
| 6am–7am | 94.3% | 0.4% | 461 |
| 7am–8am | 94.2% | 1.0% | 209 |
| 8am–9am | 88.5% | 1.2% | 424 |
| 9am–10am | 88.6% | 0.0% | 149 |
| 10am–11am | 88.6% | 0.7% | 150 |
| 11am–12pm | 76.1% | 0.6% | 177 |
| 12pm–1pm | 74.3% | 0.3% | 304 |
| 1pm–2pm | 75.8% | 0.0% | 207 |
| 2pm–3pm | 68.8% | 0.0% | 293 |
| 3pm–4pm | 74.7% | 1.5% | 268 |
| 4pm–5pm | 73.5% | 0.6% | 324 |
| 5pm–6pm | 69.8% | 0.0% | 267 |
| 6pm–7pm | 74.7% | 0.3% | 354 |
| 7pm–8pm | 56.5% | 1.2% | 170 |
| 8pm–9pm | 58.7% | 0.9% | 111 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LAS to STL
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) | 91.2% | +10.1 pts | 0.0% | 80 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.9% | -2.2 pts | 0.0% | 185 |
| Summer peak (Jun 15 - Aug 15) | 72.1% | -9.0 pts | 0.4% | 706 |
| All other days | 81.1% | — | 0.6% | 3,139 |
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).