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Flight Reliability

UA 5248 · United Airlines

Sacramento → San Francisco (SMF–SFO)100% of its flights flew this route. The rest (ORD–ASE) are included in these numbers.

56
A Little Dicey
WanderNerd Reliability Score
63%
Arrive within 15 minutes
19 min
Average arrival delay
2.7%
Cancelled
4 min
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Mondays have been rough.

UA 5248 arrived on time 73% of the time on Saturdays and just 56% on Mondays. That gap is worth planning around.

A bit behind the SMF–SFO route.

UA 5248 arrived on time 63% of the time, versus 68% across the SMF–SFO route.

Well behind the United Airlines network.

UA 5248 arrived on time 63% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 5248 arrived on time 64% of the time over the last three months in the data, compared with 56% in the three months before that.

The breakdown

On-time by weekday
  • Mon56%(50 flights)
  • Tue67%(51 flights)
  • Wed63%(51 flights)
  • Thu58%(50 flights)
  • Fri62%(50 flights)
  • Sat73%(51 flights)
  • Sun64%(52 flights)
On-time trend by month
50%
May

Jun 87% → May 50% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%30
July 202590%31
August 202565%31
September 202550%30
October 202561%31
November 202539%23
December 202548%31
January 202662%29
February 202657%28
March 202677%31
April 202663%30
May 202650%30
Departures on time
73%
Diverted
0%
Flights flown
355
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.