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Route Reliability

Portland → Washington

PWM–IAD · 493 miles · Portland International Jetport to Washington Dulles International Airport

81
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
5 min
Average arrival delay
1.9%
Cancelled
1,182
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 82% of the time across 1,182 flights. No comparison to make.

What the data says

Morning-you made the right choice.

PWM–IAD flights departing between 3–6 AM arrived on time 91% of the time, versus 73% between 12–3 PM.

Saturday has been the better bet.

A small edge: 85% on time on Saturdays against 78% on Sundays.

Trending in the right direction.

PWM–IAD flights arrived on time 91% of the time over the last three months in the data, compared with 68% 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%(167 flights)
  • Tue84%(153 flights)
  • Wed83%(158 flights)
  • Thu82%(169 flights)
  • Fri83%(173 flights)
  • Sat85%(161 flights)
  • Sun78%(175 flights)
On-time by departure window
  • 3–6 AM91%(172 flights)
  • 9 AM–12 PM91%(359 flights)
  • 12–3 PM73%(375 flights)
  • 6–9 PM77%(250 flights)
On-time trend by month
94%
May

Jun 82% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%140
July 202581%110
August 202587%111
September 202584%94
October 202583%115
November 202584%107
December 202553%89
January 202671%66
February 202681%53
March 202688%65
April 202690%89
May 202694%117

Same trip, other airports

Keep nerding

Based on 1,182 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.