Denver (DEN) to Knoxville (TYS): On-Time Performance
Data through July 2026
The calendar drives reliability on DEN–TYS. November 2025 flights landed on schedule 94% of the time, but July 2025 dropped to 52% — a gap of 42 points. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (84% vs 72%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 2.7
- last 12 months
- Duration
- 2h 54m
- scheduled
- Distance
- 1,162 mi
Best airline from DEN to TYS
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 81% | 11 min | 0.3% | 678 |
| SkyWest Airlines | 78% | 15 min | 1.1% | 841 |
| Southwest Airlines | 77% | 11 min | 0.0% | 73 |
| Frontier Airlines | 76% | 15 min | 0.0% | 261 |
| Allegiant Air | 75% | 42 min | 0.6% | 176 |
Monthly on-time trend
Best time to fly from DEN to TYS
Aim for departures around 8 a.m. (89% on-time); avoid 1 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 12 min |
| Tuesdaybest | 81% | 10 min |
| Wednesday | 80% | 12 min |
| Thursday | 79% | 14 min |
| Friday | 75% | 19 min |
| Saturday | 75% | 15 min |
| Sunday | 78% | 25 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft37%
- Airline operations36%
- National airspace system20%
- Weather7%
Frequently asked questions
- How often are flights from DEN to TYS delayed?
- 22% of DEN–TYS 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 DEN to TYS?
- United Airlines has the best on-time record on this route at 81%, based on 678 flights. 5 airlines flew DEN–TYS frequently enough to compare in this period.
- What is the best time of day to fly from DEN to TYS?
- Departures around 8 a.m. have the best record (89% on-time), while departures around 1 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from DEN to TYS?
- The scheduled DEN–TYS flight time averages 2h 54m over 1,162 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are DEN to TYS flights cancelled?
- 0.6% 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 DEN to TYS?
- July 2025 was the roughest month in this dataset, with only 52% of arrivals on time. The best was November 2025 at 94%. If your dates are flexible, that 42-point gap is worth planning around.
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Based on 2,029 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.