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Flight Reliability

UA 5937 · United Airlines

San Francisco → Santa Ana (SFO–SNA)85% of its flights flew this route. The rest (ORD–MLI, MTJ–ORD) are included in these numbers.

88
Pretty Reliable
WanderNerd Reliability Score
87%
Arrive within 15 minutes
3 min
Average arrival delay
1.5%
Cancelled
9 min early
Median arrival delay

Based on 331 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

UA 5937 departing between 6–9 AM arrived on time 89% of the time, versus 77% between 6–9 PM.

Friday is doing you no favors.

UA 5937 arrived on time 95% of the time on Saturdays. On Fridays: 81%.

A bit ahead of the SFO–SNA route.

UA 5937 arrived on time 87% of the time, versus 82% across the SFO–SNA route.

Better than the United Airlines network average.

UA 5937 arrived on time 87% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon83%(46 flights)
  • Tue94%(46 flights)
  • Wed83%(47 flights)
  • Thu94%(48 flights)
  • Fri81%(52 flights)
  • Sat95%(43 flights)
  • Sun81%(43 flights)
On-time by departure window
  • 6–9 AM89%(282 flights)
  • 9 AM–12 PM—(3 flights)
  • 12–3 PM—(9 flights)
  • 6–9 PM77%(31 flights)
On-time trend by month
86%
May

Jul 90% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202590%31
August 202584%31
September 2025100%30
October 202590%31
November 202580%25
December 202579%29
January 202696%28
February 202687%23
March 202690%31
April 202676%29
May 202686%29
Departures on time
87%
Diverted
0.3%
Flights flown
325
Months covered
12

Same route, other flights

Keep nerding

Based on 331 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.