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Flight Reliability

UA 1255 · United Airlines

Spokane → Denver (GEG–DEN)91% of its flights flew this route. The rest (DEN–MEM) are included in these numbers.

83
Pretty Reliable
WanderNerd Reliability Score
78%
Arrive within 15 minutes
8 min
Average arrival delay
0%
Cancelled
7 min early
Median arrival delay

Based on 399 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

UA 1255 departing between 6–9 PM arrived on time 97% of the time, versus 77% between 12–3 PM.

Friday is doing you no favors.

UA 1255 arrived on time 86% of the time on Sundays. On Fridays: 73%.

A bit behind the GEG–DEN route.

UA 1255 arrived on time 78% of the time, versus 84% across the GEG–DEN route.

It basically never cancels.

Out of 399 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon76%(58 flights)
  • Tue77%(56 flights)
  • Wed79%(56 flights)
  • Thu78%(55 flights)
  • Fri73%(56 flights)
  • Sat79%(57 flights)
  • Sun86%(58 flights)
On-time by departure window
  • 12–3 PM77%(361 flights)
  • 6–9 PM97%(35 flights)
On-time trend by month
97%
May

Jun 52% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202552%29
July 202555%29
August 202561%31
September 202560%30
October 202587%37
November 202590%57
December 202578%32
January 202694%31
February 202689%28
March 202668%31
April 202697%30
May 202697%31
Departures on time
80%
Diverted
0.8%
Flights flown
396
Months covered
12

Same route, other flights

Keep nerding

Based on 399 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.