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Route Reliability

Washington → JST

IAD–JST · 119 miles · Washington Dulles International Airport to JST Airport

52
A Little Dicey
WanderNerd Reliability Score
74%
Arrive within 15 minutes
35 min
Average arrival delay
3.5%
Cancelled
347
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 74% of the time across 347 flights. No comparison to make.

What the data says

Wednesdays have been rough.

IAD–JST flights arrived on time 86% of the time on Saturdays and just 66% on Wednesdays. That gap is worth planning around.

Keep a backup plan handy.

This route was cancelled 3.5% of the time. Typical for U.S. flights is around 1–2%.

Trending in the right direction.

IAD–JST flights arrived on time 76% of the time over the last three months in the data, compared with 68% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon71%(49 flights)
  • Tue74%(43 flights)
  • Wed66%(50 flights)
  • Thu72%(47 flights)
  • Fri77%(51 flights)
  • Sat86%(42 flights)
  • Sun74%(50 flights)
On-time trend by month
73%
May

Jun 57% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%30
July 202574%31
August 202581%31
September 202587%30
October 202590%31
November 202570%30
December 202552%27
January 202681%26
February 202670%27
March 202669%26
April 202686%21
May 202673%22

Keep nerding

Based on 347 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.