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Route Reliability

JST → Washington

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

55
A Little Dicey
WanderNerd Reliability Score
74%
Arrive within 15 minutes
40 min
Average arrival delay
3.2%
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

Mondays have been rough.

JST–IAD flights arrived on time 84% of the time on Saturdays and just 65% on Mondays. That gap is worth planning around.

Keep a backup plan handy.

This route was cancelled 3.2% of the time. Typical for U.S. flights is around 1–2%.

Trending in the right direction.

JST–IAD flights arrived on time 73% of the time over the last three months in the data, compared with 62% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon65%(48 flights)
  • Tue70%(43 flights)
  • Wed75%(51 flights)
  • Thu80%(51 flights)
  • Fri76%(50 flights)
  • Sat84%(43 flights)
  • Sun72%(50 flights)
On-time by departure window
  • 6–9 AM74%(335 flights)
  • 9 AM–12 PM—(1 flights)
On-time trend by month
96%
May

Jun 73% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202590%31
August 202574%31
September 202587%30
October 202594%31
November 202567%30
December 202548%27
January 202674%27
February 202664%28
March 202657%28
April 202667%21
May 202696%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.