77% of flights from Las Vegas to Des Moines arrived on time over the past 12 months. That is about the typical U.S. route. The 10 a.m. departures ran on time 81% of the time; the 1 p.m. ones 80%. Most reliable airline: Southwest Airlines (78%). 6% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for LAS → DSM: when a flight was late, it was under 45 minutes late 62% of the time. About 1 in 22 flights landed an hour or more late, and 1 in 99 three hours or more; 0.3% were cancelled outright.
- On time or early77%
- 15–30 min late8.7%
- 30–60 min late8.4%
- 1–2 hours late2.5%
- 2–3 hours late1.0%
- 3+ hours late1.0%
- Diverted0.7%
- Cancelled0.3%
Share of all 595 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Southwest Airlines | 365 | 78% | 0.5% | −4 min | 2.2% | +39 min | Southwest Airlines |
| Allegiant Air | 230 | 77% | 0.0% | −6 min | 8.3% | +99 min | Allegiant Air |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at LAS). Delays build through the day as late planes knock on, so early flights usually do best.
By month
Each calendar month pooled over 2023–2026. Best: November (89%). Worst: July (69%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 106 | 69% | 0.0% |
| Tuesday | 53 | — | — |
| Wednesday | 73 | — | — |
| Thursday | 101 | 79% | 0.0% |
| Friday | 104 | 79% | 0.0% |
| Saturday | 54 | — | — |
| Sunday | 104 | 69% | 1.9% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 2
Month by month
Not enough months with data to draw a trend.
Questions
How often are flights from LAS to DSM on time?
77% of 595 scheduled flights from Las Vegas, NV to Des Moines, IA arrived within 15 minutes of schedule between September 2025 and August 2026. 0.3% were cancelled.
What is the best time of day to fly LAS to DSM?
Flights scheduled to leave at 10 a.m. were the most reliable (81% on time). The 1 p.m. departures were the least (80%).
Which airline is most on time from LAS to DSM?
Southwest Airlines: 78% of its 365 flights on the route arrived on time. Allegiant Air: 77%.
What month has the most delays from LAS to DSM?
July (69% on time). The best month is November (89%), over 2023–2026.
Related
- DSM → LAS (return)
- Las Vegas Harry Reid (LAS) delays by hour
- Flights into Des Moines (DSM)
- Southwest Airlines on-time record
- Allegiant Air on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.