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Flight Reliability

UA 4454 · United Airlines

St. Louis → Washington (STL–IAD)

53
A Little Dicey
WanderNerd Reliability Score
68%
Arrive within 15 minutes
40 min
Average arrival delay
0.8%
Cancelled
2 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 4454 arrived on time 73% of the time on Tuesdays. On Fridays: 64%.

A bit behind the STL–IAD route.

UA 4454 arrived on time 68% of the time, versus 74% across the STL–IAD route.

Lagging the United Airlines network.

UA 4454 arrived on time 68% of the time, versus 79% across the United Airlines network.

Ticking up lately.

UA 4454 arrived on time 71% of the time over the last three months in the data, compared with 67% in the three months before that.

The breakdown

On-time by weekday
  • Mon67%(52 flights)
  • Tue73%(51 flights)
  • Wed66%(50 flights)
  • Thu71%(52 flights)
  • Fri64%(52 flights)
  • Sat68%(50 flights)
  • Sun68%(50 flights)
On-time trend by month
71%
May

Jun 63% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%27
July 202567%30
August 202565%31
September 202583%30
October 202571%31
November 202555%29
December 202560%30
January 202662%29
February 202679%28
March 202665%31
April 202677%30
May 202671%31
Departures on time
68%
Diverted
1.1%
Flights flown
357
Months covered
12

Same route, other flights

Keep nerding

Based on 364 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.