Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 1550 · United Airlines

Denver → SBP (DEN–SBP)88% of its flights flew this route. The rest (DTW–DEN, ORD–BWI) are included in these numbers.

67
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
20 min
Average arrival delay
0.5%
Cancelled
4 min early
Median arrival delay

Based on 398 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 1550 departing between 3–6 PM arrived on time 83% of the time, versus 46% between 12–3 PM.

Sunday scaries are real for this one.

UA 1550 arrived on time 84% of the time on Fridays and just 61% on Sundays. That gap is worth planning around.

A bit behind the United Airlines network.

UA 1550 arrived on time 75% of the time, versus 79% across the United Airlines network.

Recent months have been rougher.

UA 1550 arrived on time 76% of the time over the last three months in the data, compared with 86% in the three months before that.

The breakdown

On-time by weekday
  • Mon82%(54 flights)
  • Tue77%(56 flights)
  • Wed80%(55 flights)
  • Thu67%(54 flights)
  • Fri84%(55 flights)
  • Sat73%(56 flights)
  • Sun61%(57 flights)
On-time by departure window
  • 12–3 PM46%(11 flights)
  • 3–6 PM83%(59 flights)
  • 6–9 PM74%(317 flights)
On-time trend by month
58%
May

Jun 46% → May 58% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202546%35
July 202560%60
August 202569%29
September 202582%27
October 202587%30
November 202589%27
December 202587%30
January 202687%30
February 202686%28
March 202684%31
April 202686%29
May 202658%31
Departures on time
72%
Diverted
2.3%
Flights flown
387
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.