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Route Reliability

Knoxville → Washington

TYS–IAD · 420 miles · McGhee Tyson Airport to Washington Dulles International Airport

85
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
1 min
Average arrival delay
1.7%
Cancelled
1,359
Flights in the data

Data through May 2026.

Airlines on this route

  • United Airlines84% on time · 1,265 flights
  • Allegiant Air90% 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.

TYS–IAD flights departing between 3–6 AM arrived on time 94% of the time, versus 80% between 12–3 PM.

Friday is doing you no favors.

TYS–IAD flights arrived on time 88% of the time on Wednesdays. On Fridays: 78%.

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

On-time by weekday
  • Mon87%(200 flights)
  • Tue82%(179 flights)
  • Wed88%(177 flights)
  • Thu84%(198 flights)
  • Fri78%(199 flights)
  • Sat87%(179 flights)
  • Sun83%(202 flights)
On-time by departure window
  • 3–6 AM94%(174 flights)
  • 6–9 AM—(5 flights)
  • 9 AM–12 PM84%(374 flights)
  • 12–3 PM80%(400 flights)
  • 3–6 PM86%(14 flights)
  • 6–9 PM84%(367 flights)
On-time trend by month
81%
May

Jun 80% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%128
July 202573%124
August 202584%127
September 202588%116
October 202593%104
November 202584%127
December 202585%117
January 202686%92
February 202688%90
March 202682%100
April 202690%98
May 202681%111

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.