Louisville (SDF) to Las Vegas (LAS): On-Time Performance
Data through May 2026
The calendar drives reliability on SDF–LAS. December 2025 flights landed on schedule 97% of the time, but September 2024 dropped to 67% — a gap of 30 points. Across the full period the route averages 81% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 62%), which matters most in the rough months.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 1.1
- last 12 months
- Duration
- 4h 9m
- scheduled
- Distance
- 1,624 mi
Best airline from SDF to LAS
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 83% | 10 min | 0.5% | 738 |
| Spirit Airlines | 71% | 27 min | 1.6% | 124 |
Monthly on-time trend
Best time to fly from SDF to LAS
Aim for departures around 8 a.m. (95% on-time); avoid 8 p.m. departures (64%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 10 min |
| Tuesday | 84% | 12 min |
| Wednesdaybest | 85% | 9 min |
| Thursday | 82% | 13 min |
| Friday | 80% | 15 min |
| Saturday | 76% | 12 min |
| Sunday | 80% | 17 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations32%
- National airspace system25%
- Weather3%
Frequently asked questions
- How often are flights from SDF to LAS delayed?
- 19% of SDF–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 13 minutes.
- Which airline is most reliable from SDF to LAS?
- Southwest Airlines has the best on-time record on this route at 83%, based on 738 flights. 2 airlines flew SDF–LAS frequently enough to compare in this period.
- What is the best time of day to fly from SDF to LAS?
- Departures around 8 a.m. have the best record (95% on-time), while departures around 8 p.m. have the worst (64%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SDF to LAS?
- The scheduled SDF–LAS flight time averages 4h 9m over 1,624 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are SDF to LAS flights cancelled?
- 0.7% 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 SDF to LAS?
- September 2024 was the roughest month in this dataset, with only 67% of arrivals on time. The best was December 2025 at 97%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 863 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.