St. Louis (STL) to Las Vegas (LAS): On-Time Performance
Data through July 2026
The calendar drives reliability on STL–LAS. January 2025 flights landed on schedule 87% of the time, but June 2026 dropped to 55% — a gap of 32 points. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 68%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 5.7
- last 12 months
- Duration
- 3h 35m
- scheduled
- Distance
- 1,371 mi
Best airline from STL to LAS
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 79% | 12 min | 0.5% | 3,682 |
| Frontier Airlines | 75% | 28 min | 3.0% | 575 |
Monthly on-time trend
Best time to fly from STL to LAS
Aim for departures around 5 a.m. (96% on-time); avoid 7 p.m. departures (60%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 20 min |
| Tuesdaybest | 84% | 10 min |
| Wednesday | 81% | 9 min |
| Thursday | 75% | 16 min |
| Friday | 77% | 14 min |
| Saturday | 83% | 9 min |
| Sunday | 75% | 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 operations30%
- National airspace system17%
- Weather3%
Frequently asked questions
- How often are flights from STL to LAS delayed?
- 22% of STL–LAS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from STL to LAS?
- Southwest Airlines has the best on-time record on this route at 79%, based on 3,682 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 7 p.m. have the worst (60%). 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 35m over 1,371 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are STL to LAS flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from STL to LAS?
- June 2026 was the roughest month in this dataset, with only 55% of arrivals on time. The best was January 2025 at 87%. If your dates are flexible, that 32-point gap is worth planning around.
Explore related pages
More routes from STL
Other ways to fly to Las Vegas (LAS)
Related guides
Based on 4,291 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.