Route Reliability
Washington → Knoxville
IAD–TYS · 420 miles · Washington Dulles International Airport to McGhee Tyson Airport
- 78%
- Arrive within 15 minutes
- 18 min
- Average arrival delay
- 1.3%
- Cancelled
- 1,359
- Flights in the data
Data through May 2026.
Airlines on this route
- United Airlines77% on time · 1,265 flights
- Allegiant Air84% on time · 94 flights
Too little history on this route to call a winner. We rank airlines only after 100 flights each.
What the data says
Morning-you made the right choice.
IAD–TYS flights departing between 6–9 AM arrived on time 87% of the time, versus 66% between 6–9 PM.
Sunday scaries are real for this one.
IAD–TYS flights arrived on time 84% of the time on Mondays. On Sundays: 71%.
Ticking up lately.
IAD–TYS flights arrived on time 84% of the time over the last three months in the data, compared with 77% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon84%(201 flights)
- Tue82%(176 flights)
- Wed81%(178 flights)
- Thu77%(197 flights)
- Fri74%(199 flights)
- Sat75%(180 flights)
- Sun71%(205 flights)
- 6–9 AM87%(140 flights)
- 9 AM–12 PM84%(217 flights)
- 12–3 PM79%(377 flights)
- 3–6 PM80%(192 flights)
- 6–9 PM66%(228 flights)
- 9 PM–12 AM72%(182 flights)
Jun 59% → May 75% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 59% | 128 |
| July 2025 | 68% | 127 |
| August 2025 | 75% | 127 |
| September 2025 | 91% | 111 |
| October 2025 | 81% | 107 |
| November 2025 | 82% | 125 |
| December 2025 | 62% | 115 |
| January 2026 | 83% | 93 |
| February 2026 | 88% | 91 |
| March 2026 | 83% | 101 |
| April 2026 | 94% | 99 |
| May 2026 | 75% | 112 |
Same trip, other airports
Keep nerding
Based on 1,359 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.