Salt Lake City (SLC) to Denver (DEN): On-Time Performance
Data through July 2026
The calendar drives reliability on SLC–DEN. October 2024 flights landed on schedule 87% of the time, but July 2025 dropped to 63% — a gap of 24 points. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (83% vs 71%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 21
- last 12 months
- Duration
- 1h 36m
- scheduled
- Distance
- 391 mi
Best airline from SLC to DEN
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 84% | 15 min | 0.5% | 2,856 |
| United Airlines | 77% | 15 min | 0.5% | 2,750 |
| Delta Air Lines | 77% | 16 min | 0.4% | 3,467 |
| Frontier Airlines | 76% | 19 min | 1.0% | 2,134 |
| Southwest Airlines | 74% | 15 min | 0.4% | 5,035 |
Monthly on-time trend
Best time to fly from SLC to DEN
Aim for departures around 5 a.m. (94% on-time); avoid 4 p.m. departures (59%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 16 min |
| Tuesday | 78% | 15 min |
| Wednesday | 78% | 16 min |
| Thursday | 77% | 17 min |
| Friday | 73% | 18 min |
| Saturdaybest | 80% | 15 min |
| Sunday | 78% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft29%
- Airline operations35%
- National airspace system33%
- Weather4%
Frequently asked questions
- How often are flights from SLC to DEN delayed?
- 23% of SLC–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 16 minutes.
- Which airline is most reliable from SLC to DEN?
- SkyWest Airlines has the best on-time record on this route at 84%, based on 2,856 flights. 5 airlines flew SLC–DEN frequently enough to compare in this period.
- What is the best time of day to fly from SLC to DEN?
- Departures around 5 a.m. have the best record (94% 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 SLC to DEN?
- The scheduled SLC–DEN flight time averages 1h 36m over 391 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are SLC to DEN flights cancelled?
- 0.5% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SLC to DEN?
- July 2025 was the roughest month in this dataset, with only 63% of arrivals on time. The best was October 2024 at 87%. If your dates are flexible, that 24-point gap is worth planning around.
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Based on 16,242 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.