Las Vegas (LAS) to St. Louis (STL): On-Time Performance
Data through May 2026
Las Vegas (LAS) to St. Louis (STL) effectively runs on two schedules. In November 2024, 88% of arrivals were on time; in July 2024 that fell to 71% — a 18-point seasonal swing. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 68%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 5.6
- last 12 months
- Duration
- 3h 12m
- scheduled
- Distance
- 1,371 mi
Best airline from LAS to STL
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlinesmost reliable | 82% | 12 min | 2.2% | 546 |
| Southwest Airlines | 79% | 12 min | 0.3% | 3,519 |
Monthly on-time trend
Best time to fly from LAS to STL
Aim for departures around 6 a.m. (94% on-time); avoid 7 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 13 min |
| Tuesday | 86% | 8 min |
| Wednesday | 87% | 8 min |
| Thursday | 75% | 15 min |
| Friday | 78% | 15 min |
| Saturdaybest | 87% | 7 min |
| Sunday | 74% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft48%
- Airline operations41%
- National airspace system10%
- Weather1%
Frequently asked questions
- How often are flights from LAS to STL delayed?
- 20% of LAS–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 12 minutes.
- Which airline is most reliable from LAS to STL?
- Frontier Airlines has the best on-time record on this route at 82%, based on 546 flights. 2 airlines flew LAS–STL frequently enough to compare in this period.
- What is the best time of day to fly from LAS to STL?
- Departures around 6 a.m. have the best record (94% on-time), while departures around 7 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LAS to STL?
- The scheduled LAS–STL flight time averages 3h 12m over 1,371 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are LAS to STL flights cancelled?
- 0.6% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from LAS to STL?
- July 2024 was the roughest month in this dataset, with only 71% of arrivals on time. The best was November 2024 at 88%. If your dates are flexible, that 18-point gap is worth planning around.
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Based on 4,111 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.