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Route Reliability

Washington → ITH

IAD–ITH · 250 miles · Washington Dulles International Airport to ITH Airport

50
A Little Dicey
WanderNerd Reliability Score
73%
Arrive within 15 minutes
31 min
Average arrival delay
3.8%
Cancelled
837
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 73% of the time across 837 flights. No comparison to make.

What the data says

Morning flights do better here.

IAD–ITH flights departing between 6–9 AM arrived on time 85% of the time, versus 70% between 3–6 PM.

Sunday scaries are real for this one.

IAD–ITH flights arrived on time 77% of the time on Saturdays. On Sundays: 66%.

Keep a backup plan handy.

This route was cancelled 3.8% of the time. Typical for U.S. flights is around 1–2%.

Ticking up lately.

IAD–ITH flights arrived on time 78% of the time over the last three months in the data, compared with 74% 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

On-time by weekday
  • Mon76%(113 flights)
  • Tue76%(116 flights)
  • Wed71%(107 flights)
  • Thu74%(113 flights)
  • Fri74%(116 flights)
  • Sat77%(116 flights)
  • Sun66%(113 flights)
On-time by departure window
  • 6–9 AM85%(99 flights)
  • 3–6 PM70%(347 flights)
  • 9 PM–12 AM73%(348 flights)
On-time trend by month
82%
May

Jun 56% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202556%59
July 202557%54
August 202559%61
September 202581%59
October 202580%84
November 202581%58
December 202572%58
January 202672%58
February 202677%52
March 202670%82
April 202684%87
May 202682%82

Keep nerding

Based on 837 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.