Dulles (IAD) to Knoxville/Maryville (TYS) flights
CommuteAir, Mesa Airlines, Allegiant Air fly nonstop from Washington Dulles International Airport to McGhee Tyson Airport, with about 29 flights a week in July 2026. The 420-mile flight takes about 1h 40m gate to gate.
- Distance
- 420 mi · 676 km
- Flight time
- 1h 40m
- Airlines
- 3
- Seats filled
- 79%
Airlines flying IAD to TYS
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| CommuteAir | 20 | Embraer ERJ-145 | 49,300 | 1h 41m |
| Mesa Airlines | 7 | Embraer E175 | 5,004 | 1h 33m |
| Allegiant Air | 2 | Airbus A320-100/200 | 9,703 | 1h 29m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAD to TYS flight schedule
5 flight numbers flew this route in August 2026, 4 of them almost daily. The first usually leaves at 9:00am and the last at 10:15pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| UA 4257United Airlines · operated by CommuteAir | 9:00am | 10:37am | 25 | 80% |
| UA 4070United Airlines · operated by Mesa Airlines | 12:50pm | 2:37pm | 20 | 90% |
| UA 6110United Airlines · operated by Mesa Airlines | 12:50pm | 2:27pm | 10 | 83% |
| UA 4914United Airlines · operated by CommuteAir | 6:42pm | 8:24pm | 31 | 75% |
| UA 4304United Airlines · operated by CommuteAir | 10:15pm | 11:59pm | 31 | 73% |
Is IAD to TYS on time?
From September 2025 to August 2026, 79% of 1,353 flights arrived within 15 minutes of schedule and 1.3% were cancelled. Flights leaving around 12pm were the most punctual (81%), those around 6pm the least (67%). Most delay time was caused by late-arriving aircraft (50%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,266 | 79% | 30 min | 1.3% |
| Allegiant Air | 87 | 86% | 10 min | 1.1% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 8am to 9am | 54 | 93% | |
| 9am to 10am | 306 | 80% | |
| 12pm to 1pm | 312 | 81% | |
| 1pm to 2pm | 55 | 91% | |
| 3pm to 4pm | 28 | 86% | |
| 5pm to 6pm | 149 | 80% | |
| 6pm to 7pm | 161 | 67% | |
| 7pm to 8pm | 60 | 81% | |
| 10pm to 11pm | 181 | 73% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 128 | 5,728 | |
| September 2025 | 114 | 5,054 | |
| October 2025 | 107 | 5,107 | |
| November 2025 | 126 | 5,502 | |
| December 2025 | 116 | 5,552 | |
| January 2026 | 93 | 3,672 | |
| February 2026 | 91 | 4,002 | |
| March 2026 | 101 | 4,995 | |
| April 2026 | 99 | 4,942 | |
| May 2026 | 112 | 5,682 | |
| June 2026 | 128 | 6,865 | |
| July 2026 | 131 | 7,095 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.