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Flight Reliability

UA 4503 · United Airlines

Richmond → Washington (RIC–IAD)

86
Pretty Reliable
WanderNerd Reliability Score
86%
Arrive within 15 minutes
2 min
Average arrival delay
1.7%
Cancelled
14 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Mondays have been rough.

UA 4503 arrived on time 98% of the time on Sundays and just 75% on Mondays. That gap is worth planning around.

A bit ahead of the RIC–IAD route.

UA 4503 arrived on time 86% of the time, versus 82% across the RIC–IAD route.

Better than the United Airlines network average.

UA 4503 arrived on time 86% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 4503 arrived on time 90% of the time over the last three months in the data, compared with 72% in the three months before that.

The breakdown

On-time by weekday
  • Mon75%(51 flights)
  • Tue90%(50 flights)
  • Wed88%(51 flights)
  • Thu85%(52 flights)
  • Fri86%(49 flights)
  • Sat83%(52 flights)
  • Sun98%(51 flights)
On-time trend by month
90%
May

Jun 90% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%29
July 202593%29
August 202594%31
September 202587%30
October 202597%31
November 202587%30
December 202561%31
January 202682%28
February 202674%27
March 202686%29
April 202693%30
May 202690%31
Departures on time
87%
Diverted
0.3%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.