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Flight Reliability

UA 5839 · United Airlines

BFL → Denver (BFL–DEN)97% of its flights flew this route. The rest (ORD–GRB) are included in these numbers.

98
Nerd Approved
WanderNerd Reliability Score
93%
Arrive within 15 minutes
4 min early
Average arrival delay
0.3%
Cancelled
12 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

The 3–6 AM departure wins.

UA 5839 departing between 3–6 AM arrived on time 93% of the time, versus 82% between 9 AM–12 PM.

Saturday is the weak spot.

UA 5839 arrived on time 100% of the time on Fridays. On Saturdays: 86%.

A bit ahead of the BFL–DEN route.

UA 5839 arrived on time 93% of the time, versus 87% across the BFL–DEN route.

Better than the United Airlines network average.

UA 5839 arrived on time 93% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon90%(52 flights)
  • Tue94%(52 flights)
  • Wed94%(51 flights)
  • Thu92%(52 flights)
  • Fri100%(51 flights)
  • Sat86%(51 flights)
  • Sun93%(53 flights)
On-time by departure window
  • 3–6 AM93%(351 flights)
  • 9 AM–12 PM82%(11 flights)
On-time trend by month
87%
May

Jun 100% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 202590%31
August 202597%31
September 2025100%30
October 2025100%31
November 202590%30
December 202593%30
January 202677%30
February 202693%27
March 202694%31
April 202693%30
May 202687%31
Departures on time
94%
Diverted
0.3%
Flights flown
362
Months covered
12

Same route, other flights

Keep nerding

Based on 364 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.