STL to LAS flight delays & on-time performance
Nonstop flights from St. Louis Lambert International Airport to Harry Reid International Airport · 1,371 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STL or LAS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from St. Louis (STL) to Las Vegas (LAS) arrived on time 76% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.6% were cancelled, and 7% arrived an hour or more late.
- Frontier Airlines was the most punctual airline here (76% on time); Southwest Airlines was the least (76%).
- Departures scheduled around 5am did best (96% on time); around 7pm did worst (55%).
- Tuesday was the most reliable day to fly (81% on time) and Monday the least (70%).
- The largest source of delay minutes was late-arriving aircraft (48%).
Which airline is most on time from STL to LAS?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Frontier Airlines | 76% | 2.6% | 33 min | 9.7% | 309 |
| Southwest Airlines | 76% | 0.3% | 14 min | 7.1% | 1,785 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am96%178 flights
- 6am93%160 flights
- 7am90%144 flights
- 8am85%99 flights
- 9am81%99 flights
- 10am83%40 flights
- 12pm86%86 flights
- 1pm72%110 flights
- 2pm72%262 flights
- 3pm70%37 flights
- 4pm68%80 flights
- 5pm83%111 flights
- 6pm62%109 flights
- 7pm55%167 flights
- 8pm76%98 flights
- 9pm62%219 flights
- 10pm57%77 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday70%0.9% cancelled
- Tuesday81%0.4% cancelled
- Wednesday81%0.4% cancelled
- Thursday75%0.0% cancelled
- Friday75%0.9% cancelled
- Saturday80%0.4% cancelled
- Sunday72%1.2% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft48%
- Airline (crew, maintenance, cleaning, fueling)34%
- Air traffic control & airport congestion16%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)62%
- Extreme weather38%
- Air traffic control & airport congestion0%
- Security0%
STL to LAS: common questions
- How often are STL to LAS flights on time?
- 76% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from St. Louis to Las Vegas cancelled?
- 0.6% of scheduled flights were cancelled (13 of 2,094).
- How long are typical delays?
- Across all flights the average arrival delay was 17 min (early arrivals count as zero). Flights that were late arrived 65 min behind schedule on average, and 7.5% of flights were an hour or more late.
- How long is taxi time at STL?
- Flights on this route spent 12 min taxiing from the gate to takeoff on average.
Related routes
Return trip: LAS to STL — 79% on time
More flights from St. Louis
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: STL → LAS, nonstop flights by US airlines that report to the DOT. How we calculate this.