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Flight Reliability

UA 2173 · United Airlines

Boise → Denver (BOI–DEN)85% of its flights flew this route. The rest (DEN–HDN) are included in these numbers.

76
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
17 min
Average arrival delay
0.2%
Cancelled
2 min early
Median arrival delay

Based on 428 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 2173 arrived on time 82% of the time on Wednesdays and just 64% on Fridays. That gap is worth planning around.

A bit behind the BOI–DEN route.

UA 2173 arrived on time 75% of the time, versus 81% across the BOI–DEN route.

A bit behind the United Airlines network.

UA 2173 arrived on time 75% of the time, versus 79% across the United Airlines network.

It basically never cancels.

Out of 428 scheduled flights, only 0.2% were cancelled.

The breakdown

On-time by weekday
  • Mon72%(61 flights)
  • Tue80%(59 flights)
  • Wed82%(61 flights)
  • Thu66%(59 flights)
  • Fri64%(61 flights)
  • Sat77%(61 flights)
  • Sun81%(63 flights)
On-time by departure window
  • 12–3 PM75%(361 flights)
  • 6–9 PM73%(64 flights)
On-time trend by month
74%
May

Jun 57% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%30
July 202560%30
August 202552%31
September 202562%29
October 202581%31
November 202579%29
December 202584%31
January 202684%31
February 202689%28
March 202685%34
April 202682%60
May 202674%61
Departures on time
78%
Diverted
0.5%
Flights flown
425
Months covered
12

Same route, other flights

Keep nerding

Based on 428 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.