Best Time to Fly SLC to DEN: On-Time Stats by Hour & Airline
Salt Lake City International → Denver International
Data through July 2026 · Last updated October 18, 2026
7,728 flights were scheduled from Salt Lake City (SLC) to Denver (DEN) in the last 12 months, and 79.0% of those that flew arrived on time, 1.4 points above the US average of 77.6%.
SkyWest Airlines was the most punctual of the 5 airlines on the route at 85.3%, while Southwest Airlines trailed at 72.8%.
September has been the best month (84% on time) and Friday the weakest day of the week (73%).
0.5% of flights were cancelled, versus 1.8% nationally.
SLC to DEN 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 |
|---|---|---|---|---|
| SkyWest Airlines | 85.3% | 68 min | 0.7% | 1,394 |
| Delta Air Lines | 80.9% | 67 min | 0.2% | 1,696 |
| United Airlines | 80.8% | 63 min | 0.4% | 1,309 |
| Frontier Airlines | 79.2% | 76 min | 0.8% | 1,023 |
| Southwest Airlines | 72.8% | 48 min | 0.6% | 2,306 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to DEN
On-time arrival % by scheduled departure hour (local time), 15,539 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.6% | 0.5% | 897 |
| 6am–7am | 90.1% | 1.1% | 715 |
| 7am–8am | 83.5% | 0.3% | 1,663 |
| 8am–9am | 72.7% | 0.2% | 1,194 |
| 9am–10am | 86.0% | 0.0% | 608 |
| 10am–11am | 79.5% | 0.4% | 1,651 |
| 11am–12pm | 83.0% | 0.2% | 559 |
| 12pm–1pm | 83.5% | 1.3% | 461 |
| 1pm–2pm | 82.7% | 0.4% | 1,597 |
| 2pm–3pm | 69.4% | 0.3% | 1,174 |
| 3pm–4pm | 65.5% | 0.2% | 471 |
| 4pm–5pm | 58.7% | 0.7% | 677 |
| 5pm–6pm | 69.3% | 0.2% | 1,130 |
| 6pm–7pm | 68.3% | 0.9% | 1,098 |
| 7pm–8pm | 74.5% | 0.0% | 374 |
| 8pm–9pm | 69.4% | 0.7% | 606 |
| 9pm–10pm | 80.6% | 0.3% | 574 |
| 10pm–11pm | 76.1% | 0.0% | 88 |
| 11pm–12am | Limited data | 2 | |
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 DEN
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) | 80.2% | +1.3 pts | 0.0% | 273 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.5% | +1.6 pts | 0.2% | 616 |
| Summer peak (Jun 15 - Aug 15) | 70.2% | -8.7 pts | 0.6% | 2,731 |
| All other days | 78.9% | — | 0.4% | 11,919 |
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).