Las Vegas (LAS) to Denver (DEN): On-Time Performance
Data through July 2026
Las Vegas (LAS) to Denver (DEN) effectively runs on two schedules. In December 2024, 91% of arrivals were on time; in July 2025 that fell to 63% — a 28-point seasonal swing. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 68%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 19
- last 12 months
- Duration
- 1h 59m
- scheduled
- Distance
- 628 mi
Best airline from LAS to DEN
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 83% | 12 min | 0.5% | 5,080 |
| Frontier Airlines | 77% | 20 min | 1.1% | 3,424 |
| Southwest Airlines | 73% | 16 min | 0.7% | 6,804 |
Monthly on-time trend
Best time to fly from LAS to DEN
Aim for departures around 5 a.m. (96% on-time); avoid 5 p.m. departures (58%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 19 min |
| Tuesday | 80% | 14 min |
| Wednesday | 83% | 12 min |
| Thursday | 74% | 17 min |
| Friday | 74% | 18 min |
| Saturdaybest | 83% | 10 min |
| Sunday | 76% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft45%
- Airline operations24%
- National airspace system28%
- Weather3%
Frequently asked questions
- How often are flights from LAS to DEN delayed?
- 23% of LAS–DEN 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 16 minutes.
- Which airline is most reliable from LAS to DEN?
- United Airlines has the best on-time record on this route at 83%, based on 5,080 flights. 3 airlines flew LAS–DEN frequently enough to compare in this period.
- What is the best time of day to fly from LAS to DEN?
- Departures around 5 a.m. have the best record (96% on-time), while departures around 5 p.m. have the worst (58%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LAS to DEN?
- The scheduled LAS–DEN flight time averages 1h 59m over 628 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are LAS to DEN flights cancelled?
- 0.7% 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 LAS to DEN?
- July 2025 was the roughest month in this dataset, with only 63% of arrivals on time. The best was December 2024 at 91%. If your dates are flexible, that 28-point gap is worth planning around.
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Based on 15,308 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.