Miami (MIA) to Las Vegas (LAS): On-Time Performance
Data through May 2026
Miami (MIA) to Las Vegas (LAS) effectively runs on two schedules. In April 2025, 85% of arrivals were on time; in July 2024 that fell to 50% — a 35-point seasonal swing. Across the full period the route averages 72% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 67%), which matters most in the rough months.
- On-time
- 72%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 4.1
- last 12 months
- Duration
- 5h 25m
- scheduled
- Distance
- 2,174 mi
Best airline from MIA to LAS
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlinesmost reliable | 81% | 13 min | 1.9% | 104 |
| American Airlines | 72% | 20 min | 0.8% | 2,634 |
| Spirit Airlines | 71% | 21 min | 2.7% | 447 |
Monthly on-time trend
Best time to fly from MIA to LAS
Aim for departures around 8 a.m. (89% on-time); avoid 4 p.m. departures (59%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 72% | 24 min |
| Tuesday | 76% | 19 min |
| Wednesday | 73% | 18 min |
| Thursday | 69% | 21 min |
| Friday | 73% | 18 min |
| Saturdaybest | 77% | 15 min |
| Sunday | 65% | 28 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft34%
- Airline operations37%
- National airspace system23%
- Weather5%
- Security1%
Frequently asked questions
- How often are flights from MIA to LAS delayed?
- 28% of MIA–LAS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 20 minutes.
- Which airline is most reliable from MIA to LAS?
- Frontier Airlines has the best on-time record on this route at 81%, based on 104 flights. 3 airlines flew MIA–LAS frequently enough to compare in this period.
- What is the best time of day to fly from MIA to LAS?
- Departures around 8 a.m. have the best record (89% on-time), while departures around 4 p.m. have the worst (59%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MIA to LAS?
- The scheduled MIA–LAS flight time averages 5h 25m over 2,174 miles. Actual arrival times vary — flights on this route land 15+ minutes late 28% of the time.
- How often are MIA to LAS flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from MIA to LAS?
- July 2024 was the roughest month in this dataset, with only 50% of arrivals on time. The best was April 2025 at 85%. If your dates are flexible, that 35-point gap is worth planning around.
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Based on 3,191 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.