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Flight Reliability

UA 5590 · United Airlines

San Francisco → Salt Lake City (SFO–SLC)94% of its flights flew this route. The rest (TVC–ORD, ORD–TVC) are included in these numbers.

91
Nerd Approved
WanderNerd Reliability Score
83%
Arrive within 15 minutes
2 min early
Average arrival delay
0%
Cancelled
10 min early
Median arrival delay

Based on 294 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 5590 arrived on time 88% of the time on Tuesdays. On Fridays: 80%.

A bit ahead of the SFO–SLC route.

UA 5590 arrived on time 83% of the time, versus 79% across the SFO–SLC route.

A bit ahead of the United Airlines network.

UA 5590 arrived on time 83% of the time, versus 79% across the United Airlines network.

It basically never cancels.

Out of 294 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon82%(45 flights)
  • Tue88%(33 flights)
  • Wed84%(44 flights)
  • Thu80%(45 flights)
  • Fri80%(44 flights)
  • Sat87%(37 flights)
  • Sun85%(46 flights)
On-time by departure window
  • 12–3 PM—(9 flights)
  • 6–9 PM83%(285 flights)
On-time trend by month
82%
May

Jun 93% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202587%30
August 202587%31
September 202593%30
October 202587%30
November 202579%29
December 202562%26
March 202695%19
April 202676%25
May 202682%39
Departures on time
82%
Diverted
0%
Flights flown
294
Months covered
11

Same route, other flights

Keep nerding

Based on 294 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.