Best Time to Fly SLC to LAS: On-Time Stats by Hour & Airline
Salt Lake City International → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.2% of Salt Lake City (SLC) to Las Vegas (LAS) flights arrived on time (3,744 scheduled flights). That is 0.5 points above the national average of 77.6%.
Among 4 airlines, Delta Air Lines led with 79.8% on time and Spirit Airlines was last with 74.0%.
Over 24 months, Saturday was the most reliable day (85% on time) and June the worst month (72%).
The cancellation rate was 0.7% (US average 1.8%).
SLC to LAS on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 79.8% | 58 min | 0.6% | 1,718 |
| Frontier Airlines | 78.5% | 118 min | 1.3% | 528 |
| Southwest Airlines | 76.2% | 48 min | 0.4% | 1,444 |
| Spirit Airlines | 74.0% | 100 min | 3.9% | 52 |
| SkyWest Airlines | Limited data | 2 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to LAS
On-time arrival % by scheduled departure hour (local time), 7,801 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 97.1% | 0.0% | 35 |
| 6am–7am | 97.5% | 0.2% | 597 |
| 7am–8am | 94.7% | 0.6% | 324 |
| 8am–9am | 86.0% | 0.4% | 543 |
| 9am–10am | 91.0% | 1.0% | 201 |
| 10am–11am | 80.7% | 0.0% | 171 |
| 11am–12pm | 79.1% | 0.4% | 1,126 |
| 12pm–1pm | 83.1% | 0.4% | 250 |
| 1pm–2pm | 64.1% | 0.8% | 354 |
| 2pm–3pm | 68.3% | 0.4% | 242 |
| 3pm–4pm | 76.0% | 0.5% | 921 |
| 4pm–5pm | 61.9% | 1.0% | 313 |
| 5pm–6pm | 68.0% | 0.2% | 644 |
| 6pm–7pm | 76.0% | 1.4% | 351 |
| 7pm–8pm | 72.5% | 0.0% | 204 |
| 8pm–9pm | 63.3% | 0.5% | 394 |
| 9pm–10pm | 72.5% | 0.7% | 427 |
| 10pm–11pm | 77.0% | 0.7% | 408 |
| 11pm–12am | 75.0% | 0.0% | 296 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SLC to LAS
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 81.3% | +2.5 pts | 0.7% | 135 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.0% | -5.9 pts | 1.0% | 311 |
| Summer peak (Jun 15 - Aug 15) | 71.6% | -7.2 pts | 0.5% | 1,255 |
| All other days | 78.8% | — | 0.5% | 6,100 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).