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Flight Reliability

UA 5220 · United Airlines

San Francisco → Sacramento (SFO–SMF)

80
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
7 min
Average arrival delay
2.5%
Cancelled
5 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

UA 5220 departing between 6–9 AM arrived on time 86% of the time, versus 75% between 9 AM–12 PM.

Thursdays have been rough.

UA 5220 arrived on time 88% of the time on Tuesdays and just 71% on Thursdays. That gap is worth planning around.

A bit ahead of the United Airlines network.

UA 5220 arrived on time 82% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 5220 arrived on time 88% of the time over the last three months in the data, compared with 66% in the three months before that.

The breakdown

On-time by weekday
  • Mon80%(50 flights)
  • Tue88%(51 flights)
  • Wed88%(51 flights)
  • Thu71%(48 flights)
  • Fri78%(50 flights)
  • Sat86%(51 flights)
  • Sun83%(52 flights)
On-time by departure window
  • 6–9 AM86%(241 flights)
  • 9 AM–12 PM75%(112 flights)
On-time trend by month
94%
May

Jun 90% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202587%31
August 202590%31
September 202580%30
October 202590%31
November 202583%23
December 202576%29
January 202657%28
February 202664%28
March 202684%31
April 202687%30
May 202694%31
Departures on time
82%
Diverted
0%
Flights flown
353
Months covered
12

Same route, other flights

Keep nerding

Based on 362 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.