Denver (DEN) to Rock Springs (RKS): On-Time Performance
Data through May 2026
Denver (DEN) to Rock Springs (RKS) effectively runs on two schedules. In November 2025, 95% of arrivals were on time; in July 2025 that fell to 57% — a 38-point seasonal swing. Across the full period the route averages 78% on-time against a national 78%.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 21 min
- completed flights
- Cancelled
- 1.0%
- Flights/day
- 2.0
- last 12 months
- Duration
- 1h 12m
- scheduled
- Distance
- 260 mi
Monthly on-time trend
Best time to fly from DEN to RKS
Aim for departures around 8 a.m. (91% on-time); avoid 11 a.m. departures (72%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 74% | 20 min |
| Tuesday | 81% | 25 min |
| Wednesday | 80% | 18 min |
| Thursday | 77% | 33 min |
| Friday | 78% | 16 min |
| Saturdaybest | 81% | 13 min |
| Sunday | 78% | 24 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft28%
- Airline operations49%
- National airspace system15%
- Weather9%
Frequently asked questions
- How often are flights from DEN to RKS delayed?
- 22% of DEN–RKS 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 21 minutes.
- What is the best time of day to fly from DEN to RKS?
- Departures around 8 a.m. have the best record (91% on-time), while departures around 11 a.m. have the worst (72%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from DEN to RKS?
- The scheduled DEN–RKS flight time averages 1h 12m over 260 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are DEN to RKS flights cancelled?
- 1% 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 DEN to RKS?
- July 2025 was the roughest month in this dataset, with only 57% of arrivals on time. The best was November 2025 at 95%. If your dates are flexible, that 38-point gap is worth planning around.
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Based on 1,457 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.