Airport reliability
Knoxville (TYS) on-time performance
How reliably flights leave Knoxville, TN (TYS) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.
Knoxville, TN13,696 departures in 12 months
- Departures on time
- 75.1% U.S. average 75.6%
- Cancelled
- 2.1% U.S. average 1.9%
- 60+ minutes late
- 9.9% U.S. average 8.1%
- Scheduled departures
- 13,696 12 months
What this means
TYS departures ran below the U.S. average.
- 75.1% of the 13,696 scheduled departures from Knoxville (TYS) arrived at their destination on time, 0.5 points lower than the U.S. average of 75.6%.
- 2.1% of departures were cancelled (U.S. average 1.9%), and 9.9% arrived an hour or more late.
- Flights arriving at TYS were on time 70.4% of the time.
- Among airlines with at least 300 departures, Delta Air Lines was the most punctual from TYS (86.2%) and PSA Airlines the least (69.5%).
- Over the last 3 years, October was the most reliable month for departures from TYS (83.6% on time) and July the least reliable (70.8%).
- Cancellations peaked in January, when 6.4% of flights were cancelled.
- Flights scheduled to depart before 6 am were the most punctual (89.7% on time); flights scheduled to depart 9 pm to 10 pm were the least (34.9%).
Airlines at TYS
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Departures |
|---|---|---|---|---|---|
| Delta Air Lines | 86.2% | 1.8% | 4.8% | 81 min | 1,729 |
| United Airlines | 82.7% | 0.5% | 8.8% | 108 min | 728 |
| Southwest Airlines | 80.4% | 0.2% | 5.5% | 57 min | 1,010 |
| Envoy AirSold as American Eagle | 79.1% | 1.1% | 7.2% | 70 min | 759 |
| Frontier Airlines | 75.8% | 0.0% | 9.8% | 60 min | 132 |
| Republic AirwaysSold as American Eagle, Delta Connection, United Express | 74.8% | 0.9% | 12.2% | 72 min | 115 |
| American Airlines | 74.2% | 3.1% | 9.5% | 113 min | 1,563 |
| Allegiant Air | 72.0% | 0.5% | 10.8% | 84 min | 3,341 |
| SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska | 71.3% | 3.0% | 11.7% | 113 min | 1,323 |
| PSA AirlinesSold as American Eagle | 69.5% | 4.3% | 13.4% | 116 min | 2,996 |
Tap a heading to sort.
On-time rate by departure hour
Share of scheduled flights on time TYS average 75.1%
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing before 6 am | 89.7% | 707 |
| Departing 6 am to 7 am | 85.0% | 1,301 |
| Departing 7 am to 8 am | 81.9% | 1,565 |
| Departing 8 am to 9 am | 85.3% | 1,116 |
| Departing 9 am to 10 am | 82.9% | 211 |
| Departing 10 am to 11 am | 80.2% | 652 |
| Departing 11 am to noon | 75.0% | 900 |
| Departing noon to 1 pm | 76.8% | 885 |
| Departing 1 pm to 2 pm | 71.3% | 930 |
| Departing 2 pm to 3 pm | 76.5% | 642 |
| Departing 3 pm to 4 pm | 69.4% | 503 |
| Departing 4 pm to 5 pm | 73.1% | 1,179 |
| Departing 5 pm to 6 pm | 61.8% | 1,166 |
| Departing 6 pm to 7 pm | 63.8% | 1,028 |
| Departing 7 pm to 8 pm | 64.2% | 438 |
| Departing 8 pm to 9 pm | 59.8% | 266 |
| Departing 9 pm to 10 pm | 34.9% | 166 |
| Departing 10 pm to 11 pm | Insufficient sample | 37 |
| Departing 11 pm to midnight | Insufficient sample | 4 |
Best and worst months at TYS
Share of scheduled flights on time 12-month average 75.1%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | 71.3% | 3,000 |
| February | 81.1% | 2,768 |
| March | 79.5% | 3,473 |
| April | 81.5% | 3,419 |
| May | 76.1% | 3,784 |
| June | 73.7% | 4,022 |
| July | 70.8% | 4,145 |
| August | 76.3% | 3,960 |
| September | 83.0% | 3,751 |
| October | 83.6% | 4,317 |
| November | 83.6% | 3,609 |
| December | 78.1% | 3,504 |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 81.3% | 1,097 |
| Oct 2025 | 73.8% | 1,277 |
| Nov 2025 | 74.3% | 1,048 |
| Dec 2025 | 68.1% | 969 |
| Jan 2026 | 70.2% | 921 |
| Feb 2026 | 79.8% | 816 |
| Mar 2026 | 74.8% | 1,119 |
| Apr 2026 | 82.6% | 1,152 |
| May 2026 | 79.2% | 1,308 |
| Jun 2026 | 71.3% | 1,328 |
| Jul 2026 | 71.9% | 1,352 |
| Aug 2026 | 73.9% | 1,309 |
Busiest routes from TYS
| To | On time | Cancelled | Airlines | Flights |
|---|---|---|---|---|
| Chicago (ORD) | 65.6% | 4.0% | 5 | 2,165 |
| Dallas/Fort Worth (DFW) | 74.6% | 3.3% | 4 | 1,761 |
| Atlanta (ATL) | 86.2% | 1.8% | 2 | 1,728 |
| Denver (DEN) | 84.0% | 0.5% | 5 | 1,029 |
| Washington (DCA) | 66.4% | 4.4% | 3 | 1,021 |
| Charlotte (CLT) | 76.1% | 2.6% | 4 | 913 |
| Sanford (SFB) | 68.3% | 0.6% | 1 | 635 |
| St. Petersburg (PIE) | 72.6% | 0.8% | 1 | 525 |
| Miami (MIA) | 82.6% | 0.6% | 3 | 506 |
| Fort Lauderdale (FLL) | 51.0% | 0.8% | 1 | 478 |
| Nashville (BNA) | 80.8% | 0.3% | 1 | 359 |
| Philadelphia (PHL) | 79.8% | 2.8% | 2 | 351 |
| Orlando (MCO) | 74.2% | 0.7% | 2 | 295 |
| Punta Gorda (PGD) | 70.8% | 0.0% | 1 | 219 |
| Dallas (DAL) | 80.0% | 0.0% | 1 | 180 |
| Baltimore (BWI) | 93.3% | 0.0% | 1 | 179 |
| Newark (EWR) | 89.0% | 2.1% | 1 | 145 |
| Boston (BOS) | 91.0% | 0.0% | 1 | 144 |
| Phoenix (PHX) | 75.4% | 0.0% | 1 | 122 |
| Las Vegas (LAS) | 82.2% | 0.0% | 1 | 118 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Scheduled nonstop domestic departures from Knoxville, TN (TYS) by airlines that report to the DOT.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.