Knoxville/Maryville (TYS) to Dulles (IAD) flights
CommuteAir, Mesa Airlines, Allegiant Air fly nonstop from McGhee Tyson Airport to Washington Dulles International Airport, with about 30 flights a week in July 2026. The 420-mile flight takes about 1h 37m gate to gate.
- Distance
- 420 mi · 676 km
- Flight time
- 1h 37m
- Airlines
- 3
- Seats filled
- 79%
Airlines flying TYS to IAD
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| CommuteAir | 21 | Embraer ERJ-145 | 49,490 | 1h 38m |
| Mesa Airlines | 7 | Embraer E175 | 5,112 | 1h 32m |
| Allegiant Air | 2 | Airbus A320-100/200 | 9,646 | 1h 25m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
TYS to IAD flight schedule
5 flight numbers flew this route in August 2026, 4 of them almost daily. The first usually leaves at 5:45am and the last at 7:20pm. 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 4311United Airlines · operated by CommuteAir | 5:45am | 7:25am | 25 | 92% |
| UA 4325United Airlines · operated by CommuteAir | 9:45am | 11:31am | 31 | 84% |
| UA 4848United Airlines · operated by CommuteAir | 1:00pm | 2:46pm | 31 | 83% |
| UA 6297United Airlines · operated by Mesa Airlines | 7:19pm | 9:03pm | 10 | 78% |
| UA 6255United Airlines · operated by Mesa Airlines | 7:20pm | 9:04pm | 21 | 86% |
Is TYS to IAD on time?
From September 2025 to August 2026, 86% of 1,353 flights arrived within 15 minutes of schedule and 1.3% were cancelled. Flights leaving around 5am were the most punctual (92%), those around 1pm the least (81%). Most delay time was caused by late-arriving aircraft (49%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,266 | 85% | 13 min | 1.3% |
| Allegiant Air | 87 | 90% | 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 |
|---|---|---|---|
| 5am to 6am | 175 | 92% | |
| 9am to 10am | 283 | 84% | |
| 10am to 11am | 83 | 84% | |
| 1pm to 2pm | 116 | 81% | |
| 2pm to 3pm | 262 | 84% | |
| 7pm to 8pm | 368 | 85% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 129 | 6,047 | |
| September 2025 | 117 | 5,292 | |
| October 2025 | 104 | 4,927 | |
| November 2025 | 127 | 5,721 | |
| December 2025 | 118 | 5,581 | |
| January 2026 | 92 | 3,704 | |
| February 2026 | 90 | 3,918 | |
| March 2026 | 101 | 4,937 | |
| April 2026 | 98 | 4,985 | |
| May 2026 | 113 | 6,215 | |
| June 2026 | 129 | 6,415 | |
| July 2026 | 132 | 6,659 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.