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Route Reliability

Washington → Portland

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

81
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
9 min
Average arrival delay
2.0%
Cancelled
1,181
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 1,181 flights. No comparison to make.

What the data says

Morning-you made the right choice.

IAD–PWM flights departing between 6–9 AM arrived on time 91% of the time, versus 72% between 9 PM–12 AM.

Skip Thursday if you can.

IAD–PWM flights arrived on time 89% of the time on Tuesdays. On Thursdays: 78%.

Trending in the right direction.

IAD–PWM flights arrived on time 87% 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%(158 flights)
  • Tue89%(157 flights)
  • Wed79%(166 flights)
  • Thu78%(169 flights)
  • Fri83%(172 flights)
  • Sat86%(157 flights)
  • Sun81%(175 flights)
On-time by departure window
  • 6–9 AM91%(253 flights)
  • 12–3 PM90%(354 flights)
  • 3–6 PM74%(376 flights)
  • 9 PM–12 AM72%(171 flights)
On-time trend by month
93%
May

Jun 78% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%140
July 202575%112
August 202592%109
September 202593%94
October 202585%113
November 202579%106
December 202560%88
January 202668%68
February 202694%53
March 202686%64
April 202683%90
May 202693%117

Same trip, other airports

Keep nerding

Based on 1,181 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.