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Flight Reliability

UA 558 · United Airlines

Denver → Boston (DEN–BOS)91% of its flights flew this route. The rest (BOS–EWR) are included in these numbers.

93
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
7 min early
Average arrival delay
0.8%
Cancelled
12 min early
Median arrival delay

Based on 372 historical flights. Data through May 2026.

What the data says

Skip Monday if you can.

UA 558 arrived on time 94% of the time on Tuesdays. On Mondays: 85%.

Well ahead of the DEN–BOS route.

UA 558 arrived on time 90% of the time, versus 72% across the DEN–BOS route.

Better than the United Airlines network average.

UA 558 arrived on time 90% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon85%(54 flights)
  • Tue94%(52 flights)
  • Wed91%(54 flights)
  • Thu91%(55 flights)
  • Fri93%(56 flights)
  • Sat86%(44 flights)
  • Sun87%(53 flights)
On-time by departure window
  • 6–9 AM90%(337 flights)
  • 3–6 PM87%(31 flights)
On-time trend by month
97%
May

Jun 90% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202597%31
August 202584%31
September 202587%30
October 202577%30
November 202589%26
December 202592%24
January 202693%42
February 202694%32
March 202684%31
April 202693%30
May 202697%31
Departures on time
92%
Diverted
0.3%
Flights flown
368
Months covered
12

Same route, other flights

Keep nerding

Based on 372 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.