Best Time to Fly DEN to SLC: On-Time Stats by Hour & Airline
Denver International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
7,733 flights were scheduled from Denver (DEN) to Salt Lake City (SLC) in the last 12 months, and 78.8% of those that flew arrived on time, 1.1 points above the US average of 77.6%.
Among 5 airlines, Delta Air Lines led with 83.4% on time and Southwest Airlines was last with 72.8%.
Over 24 months, Tuesday was the most reliable day (81% on time) and July the worst month (66%).
The cancellation rate was 0.4% (US average 1.8%).
DEN to SLC 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 | 83.4% | 82 min | 0.3% | 1,696 |
| Frontier Airlines | 82.2% | 54 min | 0.3% | 1,023 |
| SkyWest Airlines | 80.5% | 65 min | 0.6% | 1,399 |
| United Airlines | 78.8% | 55 min | 0.1% | 1,308 |
| Southwest Airlines | 72.8% | 51 min | 0.4% | 2,307 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to SLC
On-time arrival % by scheduled departure hour (local time), 15,550 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 2 | |
| 5am–6am | 88.2% | 0.3% | 613 |
| 6am–7am | 94.7% | 0.0% | 473 |
| 7am–8am | 89.7% | 0.0% | 759 |
| 8am–9am | 88.5% | 0.3% | 1,525 |
| 9am–10am | 84.3% | 0.5% | 385 |
| 10am–11am | 85.2% | 0.7% | 585 |
| 11am–12pm | 79.4% | 0.3% | 1,329 |
| 12pm–1pm | 81.9% | 0.5% | 852 |
| 1pm–2pm | 81.4% | 0.1% | 1,062 |
| 2pm–3pm | 76.1% | 0.1% | 706 |
| 3pm–4pm | 78.9% | 0.8% | 1,365 |
| 4pm–5pm | 71.8% | 0.0% | 505 |
| 5pm–6pm | 69.2% | 0.2% | 951 |
| 6pm–7pm | 67.2% | 0.2% | 994 |
| 7pm–8pm | 65.6% | 0.8% | 1,038 |
| 8pm–9pm | 70.2% | 0.3% | 1,015 |
| 9pm–10pm | 63.6% | 0.8% | 644 |
| 10pm–11pm | 66.6% | 0.7% | 739 |
| 11pm–12am | Limited data | 8 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN to SLC
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) | 76.5% | -4.0 pts | 0.0% | 272 |
| Christmas & New Year (Dec 20 - Jan 3) | 71.8% | -8.7 pts | 0.0% | 616 |
| Summer peak (Jun 15 - Aug 15) | 66.4% | -14.0 pts | 0.8% | 2,732 |
| All other days | 80.5% | — | 0.3% | 11,930 |
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).