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Flight Reliability

UA 5583 · United Airlines

Tucson → San Francisco (TUS–SFO)84% of its flights flew this route. The rest (SFO–RNO) are included in these numbers.

83
Pretty Reliable
WanderNerd Reliability Score
78%
Arrive within 15 minutes
9 min
Average arrival delay
0.5%
Cancelled
8 min early
Median arrival delay

Based on 400 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 5583 departing between 9 AM–12 PM arrived on time 100% of the time, versus 58% between 3–6 PM.

Friday is doing you no favors.

UA 5583 arrived on time 87% of the time on Tuesdays and just 64% on Fridays. That gap is worth planning around.

Slipping a little lately.

UA 5583 arrived on time 67% 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
  • Mon75%(57 flights)
  • Tue87%(55 flights)
  • Wed83%(59 flights)
  • Thu79%(58 flights)
  • Fri64%(58 flights)
  • Sat76%(50 flights)
  • Sun80%(60 flights)
On-time by departure window
  • 9 AM–12 PM100%(37 flights)
  • 12–3 PM80%(284 flights)
  • 3–6 PM58%(76 flights)
On-time trend by month
63%
May

Jun 93% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202590%31
August 202594%31
September 2025100%24
November 202587%30
December 202568%31
January 202673%30
February 202671%28
March 202674%58
April 202664%50
May 202663%48
Departures on time
75%
Diverted
0.3%
Flights flown
397
Months covered
12

Same route, other flights

Keep nerding

Based on 400 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.