Knoxville (TYS) to Sanford (SFB): On-Time Performance
Data through July 2026
When you fly TYS to SFB matters as much as anything else about the booking: the route swung from 89% on-time in September 2025 to just 36% in July 2026. Across the full period the route averages 69% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 61%), which matters most in the rough months.
- On-time
- 69%
- arrived <15 min late
- Avg delay
- 27 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 1.8
- last 12 months
- Duration
- 1h 35m
- scheduled
- Distance
- 511 mi
Monthly on-time trend
Best time to fly from TYS to SFB
Aim for departures around 8 a.m. (93% on-time); avoid 10 p.m. departures (36%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 69% | 37 min |
| Tuesday | 76% | 16 min |
| Wednesdaybest | 79% | 15 min |
| Thursday | 78% | 13 min |
| Friday | 65% | 31 min |
| Saturday | 67% | 32 min |
| Sunday | 59% | 36 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft56%
- Airline operations19%
- National airspace system15%
- Weather9%
Frequently asked questions
- How often are flights from TYS to SFB delayed?
- 31% of TYS–SFB 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 27 minutes.
- What is the best time of day to fly from TYS to SFB?
- Departures around 8 a.m. have the best record (93% on-time), while departures around 10 p.m. have the worst (36%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from TYS to SFB?
- The scheduled TYS–SFB flight time averages 1h 35m over 511 miles. Actual arrival times vary — flights on this route land 15+ minutes late 31% of the time.
- How often are TYS to SFB flights cancelled?
- 1.1% 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 TYS to SFB?
- July 2026 was the roughest month in this dataset, with only 36% of arrivals on time. The best was September 2025 at 89%. If your dates are flexible, that 54-point gap is worth planning around.
Explore related pages
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Related guides
Based on 1,336 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.