DSM to LAS flight delays
Des Moines, IA (DSM) Las Vegas, NV (LAS) · 1,216 miles
594 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
79.53%
Arrived on time
Within 15 minutes of schedule
0.34%
Cancelled
Share of scheduled flights
90 min
When late, late by
Average across delayed arrivals
19 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. Southwest Airlines arrived on time 10.2 points more often than Allegiant Air over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The season swings this route hard. In October it ran 26.5 points more punctual than in December — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The shape of the lateness matters here. Flights on this route are not late often, but when they are late they are late by about 90 minutes — long enough to lose a connection or an evening. The on-time percentage looks reassuring and understates the consequence of being on the wrong flight.
This is a thin route — 594 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over January 2025 – August 2026, Southwest Airlines arrived on time most often on DSM to LAS. Allegiant Air was late most often. Flights ran closest to schedule in October and worst in December.
Every airline on DSM to LAS
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 365 | 83.47% | 0.55% | 58 min | B |
| Allegiant Air | 229 | 73.25% | 0% | 121 min | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
LAS to DSM Las Vegas back to Des Moines 79.25% on time COther routes from Des Moines
Common questions
Are flights from Des Moines to Las Vegas usually delayed?
79.53% of flights on the DSM to LAS route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from Des Moines to Las Vegas?
Southwest Airlines, at 83.47% on time across 365 flights. The least punctual on the route was Allegiant Air at 73.25%.
How often are DSM to LAS flights cancelled?
0.34% of scheduled flights did not operate — about 3 in every thousand. That is in the normal range.
What is the best month to fly Des Moines to Las Vegas?
October, when 92.5% of flights arrived on time. The worst was December at 66%.
When DSM to LAS flights are late, how late are they?
About 90 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on DSM to LAS during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →