Route on-time record
DSM to LAS: most on-time flights and the best time to fly
Des Moines (Des Moines International Airport) to Las Vegas (Harry Reid International Airport). 595 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was Southwest 2127 at 12:25 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
DSM → LAS
Des Moines to Las Vegas: 595 nonstop flights a year
On time (12 months)
82%
Cancelled
0.5%
avg delay 18 min
Best time to leave
9 AM to noon
90% on time vs 73% 3 to 6 PM
Most reliable airline
Southwest
84% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Southwest 2127
12:25 PM → 1:40 PM3h 15m nonstop
Local times, typical schedule. Last flown 2026-05-29.
88%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 87% of the time (23 flights, Jun 2025 to May 2026).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 2127 fares Opens this date on Aviasales#2 · Allegiant 447
11:00 AM → 12:16 PM3h 16m nonstop
Local times, typical schedule. Last flown 2026-05-17.
85%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 24 min
- Arrived on time 89% of the time (27 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 90% on time; 3 to 6 PM: 73%).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (27 flights), so its score leans on the airline's record at this hour.
Limited track record · 27 flights
Find Allegiant 447 fares Opens this date on Aviasales#3 · Southwest 2387
12:45 PM → 1:55 PM3h 10m nonstop
Local times, typical schedule. Last flown 2026-04-06.
84%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 79% of the time (28 flights, Jun 2025 to May 2026).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- 67% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find Southwest 2387 fares Opens this date on Aviasales#4 · Southwest 1150
12:00 PM → 1:10 PM3h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 20 min
- Arrived on time 75% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 1150 fares Opens this date on Aviasales#5 · Allegiant 93
8:15 PM → 9:31 PM3h 16m nonstop
Local times, typical schedule. Last flown 2026-05-08.
69%
chance on time
- On time (history)
- 58%
- Cancelled
- 0.0%
- Avg arrival delay
- 26 min
- Arrived on time 58% of the time (12 flights, Jun 2025 to May 2026).
- Short track record (12 flights), so its score leans on the airline's record at this hour.
Limited track record · 12 flights
Find Allegiant 93 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines84%
365 flights · 85% on time as flown · 0.5% cancel
- Allegiant Air77%
230 flights · 76% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM81%
63 flights · avg delay 45 min
- 9 AM to noon90%
130 flights · avg delay 11 min
- Noon to 3 PM86%
264 flights · avg delay 10 min
- 3 to 6 PM73%
84 flights · avg delay 25 min
Best day: Wednesday (86%). Worst: Thursday (75%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)31%
- Late-arriving aircraft28%
- Air traffic control and airport volume21%
- Severe weather20%
- Security1%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
DSM to LAS questions
- What time of day is best to fly DSM to LAS?
- 9 AM to noon: 90% of flights arrived on time, against 73% for departures 3 to 6 PM.
- Which airline is most on time from DSM to LAS?
- Southwest, with a season-adjusted 84% chance of operating and arriving on time over 365 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on DSM to LAS?
- July (69% on time); the best was November (91%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from DSM
- LAS to DSM (return)
- DSM to ORD 73%
- DSM to DEN 83%
- DSM to DFW 73%
- DSM to ATL 89%
- DSM to PHX 82%
- DSM to CLT 83%
- DSM to DCA 77%
- DSM to STL 90%
- DSM to IAH 90%
- DSM to PHL 80%
Live status: FAA delays and ground stops