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Route Reliability

Washington → Buffalo

IAD–BUF · 283 miles · Washington Dulles International Airport to Buffalo Niagara International Airport

73
Usually Fine
WanderNerd Reliability Score
78%
Arrive within 15 minutes
14 min
Average arrival delay
2.7%
Cancelled
1,169
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 78% of the time across 1,169 flights. No comparison to make.

What the data says

Morning flights do better here.

IAD–BUF flights departing between 6–9 AM arrived on time 86% of the time, versus 70% between 9 PM–12 AM.

Sunday scaries are real for this one.

IAD–BUF flights arrived on time 83% of the time on Thursdays. On Sundays: 75%.

Trending in the right direction.

IAD–BUF flights arrived on time 82% 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
  • Mon79%(170 flights)
  • Tue77%(156 flights)
  • Wed77%(153 flights)
  • Thu83%(171 flights)
  • Fri75%(166 flights)
  • Sat83%(150 flights)
  • Sun75%(170 flights)
On-time by departure window
  • 6–9 AM86%(242 flights)
  • 12–3 PM83%(330 flights)
  • 3–6 PM74%(351 flights)
  • 9 PM–12 AM70%(213 flights)
On-time trend by month
85%
May

Jun 63% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%107
July 202572%112
August 202578%114
September 202590%98
October 202589%89
November 202579%84
December 202566%73
January 202673%64
February 202682%68
March 202676%105
April 202686%106
May 202685%116

Same trip, other airports

Keep nerding

Based on 1,169 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.