St. Louis (STL) to Las Vegas (LAS): On-Time Performance
Data through May 2026
The calendar drives reliability on STL–LAS. January 2025 flights landed on schedule 87% of the time, but April 2026 dropped to 71% — a gap of 16 points. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 71%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 5.6
- last 12 months
- Duration
- 3h 36m
- scheduled
- Distance
- 1,371 mi
Best airline from STL to LAS
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 81% | 12 min | 0.5% | 3,512 |
| Frontier Airlines | 78% | 24 min | 3.1% | 546 |
Monthly on-time trend
Best time to fly from STL to LAS
Aim for departures around 5 a.m. (96% on-time); avoid 10 p.m. departures (63%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 18 min |
| Tuesday | 84% | 10 min |
| Wednesday | 84% | 7 min |
| Thursday | 77% | 15 min |
| Friday | 79% | 12 min |
| Saturdaybest | 85% | 9 min |
| Sunday | 77% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft51%
- Airline operations29%
- National airspace system18%
- Weather2%
Frequently asked questions
- How often are flights from STL to LAS delayed?
- 20% of STL–LAS 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 13 minutes.
- Which airline is most reliable from STL to LAS?
- Southwest Airlines has the best on-time record on this route at 81%, based on 3,512 flights. 2 airlines flew STL–LAS frequently enough to compare in this period.
- What is the best time of day to fly from STL to LAS?
- Departures around 5 a.m. have the best record (96% on-time), while departures around 10 p.m. have the worst (63%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to LAS?
- The scheduled STL–LAS flight time averages 3h 36m over 1,371 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are STL to LAS flights cancelled?
- 0.9% 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 STL to LAS?
- April 2026 was the roughest month in this dataset, with only 71% of arrivals on time. The best was January 2025 at 87%. If your dates are flexible, that 16-point gap is worth planning around.
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Based on 4,104 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.