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Flight Reliability

UA 647 · United Airlines

Boston → Denver (BOS–DEN)100% of its flights flew this route. The rest (TYS–DEN) are included in these numbers.

93
Nerd Approved
WanderNerd Reliability Score
91%
Arrive within 15 minutes
6 min early
Average arrival delay
1.6%
Cancelled
9 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Wednesday comes out ahead.

A small edge: 94% on time on Wednesdays against 89% on Saturdays.

Better than the BOS–DEN route average.

UA 647 arrived on time 91% of the time, versus 77% across the BOS–DEN route.

Better than the United Airlines network average.

UA 647 arrived on time 91% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 647 arrived on time 93% of the time over the last three months in the data, compared with 85% in the three months before that.

The breakdown

On-time by weekday
  • Mon90%(50 flights)
  • Tue92%(51 flights)
  • Wed94%(50 flights)
  • Thu92%(52 flights)
  • Fri92%(51 flights)
  • Sat89%(52 flights)
  • Sun89%(53 flights)
On-time trend by month
97%
May

Jun 93% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202597%31
August 202590%31
September 202590%30
October 202594%31
November 202593%29
December 202584%31
January 202683%30
February 202688%25
March 202687%30
April 202697%30
May 202697%31
Departures on time
94%
Diverted
0%
Flights flown
359
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.