Denver (DEN) to Las Vegas (LAS): On-Time Performance
Data through July 2026
The calendar drives reliability on DEN–LAS. December 2024 flights landed on schedule 86% of the time, but July 2025 dropped to 63% — a gap of 24 points. Across the full period the route averages 75% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 65%), which matters most in the rough months.
- On-time
- 75%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 20
- last 12 months
- Duration
- 2h 3m
- scheduled
- Distance
- 628 mi
Best airline from DEN to LAS
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 78% | 15 min | 0.4% | 5,085 |
| Frontier Airlines | 76% | 19 min | 0.9% | 3,420 |
| Southwest Airlines | 73% | 16 min | 0.6% | 6,819 |
Monthly on-time trend
Best time to fly from DEN to LAS
Aim for departures around 5 a.m. (98% on-time); avoid 9 p.m. departures (60%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 74% | 19 min |
| Tuesdaybest | 80% | 14 min |
| Wednesday | 80% | 13 min |
| Thursday | 70% | 21 min |
| Friday | 71% | 20 min |
| Saturday | 80% | 12 min |
| Sunday | 75% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft51%
- Airline operations26%
- National airspace system21%
- Weather3%
Frequently asked questions
- How often are flights from DEN to LAS delayed?
- 25% of DEN–LAS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 17 minutes.
- Which airline is most reliable from DEN to LAS?
- United Airlines has the best on-time record on this route at 78%, based on 5,085 flights. 3 airlines flew DEN–LAS frequently enough to compare in this period.
- What is the best time of day to fly from DEN to LAS?
- Departures around 5 a.m. have the best record (98% on-time), while departures around 9 p.m. have the worst (60%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from DEN to LAS?
- The scheduled DEN–LAS flight time averages 2h 3m over 628 miles. Actual arrival times vary — flights on this route land 15+ minutes late 25% of the time.
- How often are DEN to LAS flights cancelled?
- 0.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from DEN to LAS?
- July 2025 was the roughest month in this dataset, with only 63% of arrivals on time. The best was December 2024 at 86%. If your dates are flexible, that 24-point gap is worth planning around.
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Based on 15,324 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.