Route on-time record
LAS to DEN: most on-time flights and the best time to fly
Las Vegas (Harry Reid International Airport) to Denver (Denver International Airport). 7,060 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 596 at 5:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LAS → DEN
Las Vegas to Denver: 7,060 nonstop flights a year
On time (12 months)
77%
Cancelled
0.8%
avg delay 16 min
Best time to leave
Before 9 AM
90% on time vs 64% 3 to 6 PM
Most reliable airline
United
82% chance on time
Lowest nonstop fare seen in the next two months: $83 (Frontier 2350 on 2026-11-19). 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 · United 596
5:30 AM → 8:35 AM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
96%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.3%
- Avg arrival delay
- 2 min
- Arrived on time 96% of the time (362 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 64%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Strong track record · 362 flights
Find United 596 fares Opens this date on Aviasales#2 · Southwest 3115
5:15 AM → 8:05 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
94%
chance on time
- On time (history)
- 100%
- Cancelled
- 3.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (1 of 33).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 64%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Limited track record · 31 flights
Find Southwest 3115 fares Opens this date on Aviasales#3 · Southwest 1916
5:35 AM → 8:25 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 97% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 64%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Limited track record · 39 flights
Find Southwest 1916 fares Opens this date on Aviasales#4 · United 1824
10:50 AM → 1:54 PM2h 04m nonstop
Local times, typical schedule. Last flown 2026-05-20.
93%
chance on time
- On time (history)
- 98%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 98% of the time (50 flights, Jun 2025 to May 2026).
- Never cancelled in 50 scheduled flights.
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (50 flights), so its score leans on the airline's record at this hour.
Limited track record · 50 flights
Find United 1824 fares Opens this date on Aviasales#5 · United 617
9:05 AM → 12:09 PM2h 04m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1590; its record covers all of them.
92%
chance on time
- On time (history)
- 96%
- Cancelled
- 1.9%
- Avg arrival delay
- 8 min
- Arrived on time 96% of the time (51 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Short track record (51 flights), so its score leans on the airline's record at this hour.
Limited track record · 51 flights
Find United 617 fares Opens this date on Aviasales#6 · United 1315
9:37 AM → 12:41 PM2h 04m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 1315 fares Opens this date on Aviasales#7 · United 501
9:19 AM → 12:18 PM1h 59m nonstop
Local times, typical schedule. Last flown 2026-03-28.
89%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 91% of the time (138 flights, Jun 2025 to May 2026).
- Never cancelled in 138 scheduled flights.
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Moderate track record · 138 flights
Find United 501 fares Opens this date on Aviasales#8 · United 1006
11:53 AM → 2:53 PM1h 59m nonstop
Local times, typical schedule. Last flown 2026-05-20.
88%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 91% of the time (150 flights, Jun 2025 to May 2026).
- Never cancelled in 150 scheduled flights.
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 150 flights
Find United 1006 fares Opens this date on Aviasales#9 · United 1484
9:58 AM → 12:57 PM1h 59m nonstop
Local times, typical schedule. Last flown 2026-03-27.
88%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 86% of the time (21 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Short track record (21 flights), so its score leans on the airline's record at this hour.
Limited track record · 21 flights
Find United 1484 fares Opens this date on Aviasales#10 · Frontier 4968
8:14 AM → 11:19 AM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.7%
- Avg arrival delay
- 10 min
- Arrived on time 88% of the time (137 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 64%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- 61% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 137 flights
Find Frontier 4968 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines82%
2,454 flights · 83% on time as flown · 0.5% cancel
- Frontier Airlines78%
1,480 flights · 79% on time as flown · 0.9% cancel
- Southwest Airlines70%
3,126 flights · 71% on time as flown · 1.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
1,591 flights · avg delay 7 min
- 9 AM to noon86%
1,449 flights · avg delay 9 min
- Noon to 3 PM67%
1,171 flights · avg delay 21 min
- 3 to 6 PM64%
1,350 flights · avg delay 27 min
- 6 to 9 PM70%
937 flights · avg delay 22 min
- After 9 PM77%
562 flights · avg delay 15 min
Best day: Wednesday (82%). Worst: Friday (72%).
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
- Late-arriving aircraft44%
- Air traffic control and airport volume29%
- Airline (crew, maintenance, boarding)23%
- Severe weather4%
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
LAS to DEN questions
- What time of day is best to fly LAS to DEN?
- Before 9 AM: 90% of flights arrived on time, against 64% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from LAS to DEN?
- United, with a season-adjusted 82% chance of operating and arriving on time over 2,454 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 LAS to DEN?
- June (65% on time); the best was December (85%), 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 LAS
- DEN to LAS (return)
- LAS to LAX 79%
- LAS to SAN 68%
- LAS to PHX 78%
- LAS to SFO 66%
- LAS to SEA 82%
- LAS to ORD 77%
- LAS to DFW 81%
- LAS to ATL 84%
- LAS to SNA 82%
- LAS to SMF 79%
- LAS to BUR 80%
- LAS to RNO 80%
Live status: FAA delays and ground stops