Skip to content
WanderNerd
Check a flight

Route Reliability

Washington → MDT

IAD–MDT · 93 miles · Washington Dulles International Airport to MDT Airport

80
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
14 min
Average arrival delay
1.7%
Cancelled
1,092
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 81% of the time across 1,092 flights. No comparison to make.

What the data says

Morning flights do better here.

IAD–MDT flights departing between 6–9 AM arrived on time 86% of the time, versus 76% between 3–6 PM.

Tuesday comes out ahead.

A small edge: 84% on time on Tuesdays against 78% on Thursdays.

Trending in the right direction.

IAD–MDT flights arrived on time 88% 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
  • Mon80%(153 flights)
  • Tue84%(152 flights)
  • Wed82%(153 flights)
  • Thu78%(167 flights)
  • Fri79%(163 flights)
  • Sat84%(133 flights)
  • Sun81%(151 flights)
On-time by departure window
  • 6–9 AM86%(291 flights)
  • 12–3 PM83%(347 flights)
  • 3–6 PM76%(278 flights)
  • 9 PM–12 AM77%(156 flights)
On-time trend by month
87%
May

Jun 75% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%113
July 202572%95
August 202583%93
September 202595%78
October 202591%92
November 202572%78
December 202569%87
January 202674%81
February 202680%79
March 202686%92
April 202691%90
May 202687%94

Keep nerding

Based on 1,092 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.