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Route Reliability

Washington → Portland

IAD–PDX · 2,327 miles · Washington Dulles International Airport to Portland International Airport

80
Pretty Reliable
WanderNerd Reliability Score
73%
Arrive within 15 minutes
12 min
Average arrival delay
0%
Cancelled
291
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 291 flights. No comparison to make.

What the data says

The 3–6 PM departure wins.

IAD–PDX flights departing between 3–6 PM arrived on time 75% of the time, versus 60% between 6–9 PM.

Thursdays have been rough.

IAD–PDX flights arrived on time 81% of the time on Sundays and just 64% on Thursdays. That gap is worth planning around.

It basically never cancels.

Out of 291 scheduled flights, only 0.0% were cancelled.

Ticking up lately.

IAD–PDX flights arrived on time 75% of the time over the last three months in the data, compared with 71% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon71%(42 flights)
  • Tue78%(40 flights)
  • Wed68%(40 flights)
  • Thu64%(42 flights)
  • Fri79%(42 flights)
  • Sat71%(42 flights)
  • Sun81%(43 flights)
On-time by departure window
  • 3–6 PM75%(256 flights)
  • 6–9 PM60%(35 flights)
On-time trend by month
77%
May

Jun 63% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%30
July 202552%31
August 202584%31
September 202587%30
October 202590%31
November 202570%30
December 202553%15
March 202663%27
April 202683%30
May 202677%31

Same trip, other airports

Keep nerding

Based on 291 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.