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Flight Reliability

UA 5643 · United Airlines

Denver → SAF (DEN–SAF)90% of its flights flew this route. The rest (ORD–CAK, ORD–SYR) are included in these numbers.

73
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
15 min
Average arrival delay
1.7%
Cancelled
6 min early
Median arrival delay

Based on 355 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 5643 departing between 3–6 PM arrived on time 79% of the time, versus 38% between 6–9 PM.

Tuesdays have been rough.

UA 5643 arrived on time 87% of the time on Saturdays and just 72% on Tuesdays. That gap is worth planning around.

A bit behind the DEN–SAF route.

UA 5643 arrived on time 77% of the time, versus 81% across the DEN–SAF route.

Trending in the right direction.

UA 5643 arrived on time 87% of the time over the last three months in the data, compared with 71% in the three months before that.

The breakdown

On-time by weekday
  • Mon77%(51 flights)
  • Tue72%(46 flights)
  • Wed76%(50 flights)
  • Thu74%(49 flights)
  • Fri77%(51 flights)
  • Sat87%(47 flights)
  • Sun76%(53 flights)
On-time by departure window
  • 3–6 PM79%(315 flights)
  • 6–9 PM38%(16 flights)
  • 9 PM–12 AM69%(16 flights)
On-time trend by month
90%
May

Jun 55% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202555%29
July 202562%29
August 202570%27
September 202580%30
October 202593%30
November 202586%21
December 202555%31
January 202677%31
February 202682%28
March 202677%31
April 202693%30
May 202690%30
Departures on time
79%
Diverted
0.6%
Flights flown
347
Months covered
12

Same route, other flights

Keep nerding

Based on 355 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.