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Flight Reliability

UA 5491 · United Airlines

San Francisco → PSC (SFO–PSC)88% of its flights flew this route. The rest (IAH–MAF, DFW–IAH) are included in these numbers.

98
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
1 min
Average arrival delay
0%
Cancelled
6 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 94% of the time, against 89% between 9 AM–12 PM.

Wednesday is the weak spot.

UA 5491 arrived on time 94% of the time on Thursdays. On Wednesdays: 83%.

Better than the SFO–PSC route average.

UA 5491 arrived on time 90% of the time, versus 81% across the SFO–PSC route.

Better than the United Airlines network average.

UA 5491 arrived on time 90% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon90%(52 flights)
  • Tue92%(52 flights)
  • Wed83%(52 flights)
  • Thu94%(51 flights)
  • Fri85%(52 flights)
  • Sat92%(52 flights)
  • Sun91%(53 flights)
On-time by departure window
  • 3–6 AM—(9 flights)
  • 9 AM–12 PM89%(321 flights)
  • 3–6 PM94%(32 flights)
  • 6–9 PM—(2 flights)
On-time trend by month
71%
May

Jun 93% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202594%31
August 202597%31
September 202590%30
October 202587%31
November 2025100%30
December 202597%31
January 202684%31
February 202678%27
March 202694%31
April 202690%30
May 202671%31
Departures on time
86%
Diverted
0%
Flights flown
364
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.