Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 557 · United Airlines

Charleston → Denver (CHS–DEN)90% of its flights flew this route. The rest (DEN–HDN, DEN–SNA) are included in these numbers.

64
A Little Dicey
WanderNerd Reliability Score
71%
Arrive within 15 minutes
19 min
Average arrival delay
0.8%
Cancelled
0 min
Median arrival delay

Based on 398 historical flights. Data through May 2026.

What the data says

6–9 PM has a slight edge.

Departures between 6–9 PM arrived on time 76% of the time, against 70% between 3–6 PM.

Saturdays have been rough.

UA 557 arrived on time 81% of the time on Mondays and just 61% on Saturdays. That gap is worth planning around.

Lagging the United Airlines network.

UA 557 arrived on time 71% of the time, versus 79% across the United Airlines network.

Recent months have been rougher.

UA 557 arrived on time 71% of the time over the last three months in the data, compared with 84% in the three months before that.

The breakdown

On-time by weekday
  • Mon81%(57 flights)
  • Tue68%(56 flights)
  • Wed76%(55 flights)
  • Thu70%(57 flights)
  • Fri74%(53 flights)
  • Sat61%(54 flights)
  • Sun66%(56 flights)
On-time by departure window
  • 3–6 PM70%(351 flights)
  • 6–9 PM76%(37 flights)
On-time trend by month
70%
May

Jun 45% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202545%29
July 202550%28
August 202560%30
September 202573%30
October 202565%31
November 202582%28
December 202580%40
January 202694%34
February 202679%28
March 202676%54
April 202666%29
May 202670%27
Departures on time
75%
Diverted
1.8%
Flights flown
388
Months covered
12

Same route, other flights

Keep nerding

Based on 398 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.