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Route Reliability

STS → San Diego

STS–SAN · 508 miles · STS Airport to San Diego International Airport

68
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
10 min
Average arrival delay
3.8%
Cancelled
938
Flights in the data

Data through May 2026.

Airlines on this route

  • Alaska Airlines76% on time · 853 flights
  • Southwest Airlines86% on time · 85 flights

Too little history on this route to call a winner. We rank airlines only after 100 flights each.

What the data says

Morning-you made the right choice.

STS–SAN flights departing between 6–9 AM arrived on time 91% of the time, versus 62% between 6–9 PM.

Skip Thursday if you can.

STS–SAN flights arrived on time 85% of the time on Wednesdays. On Thursdays: 70%.

Keep a backup plan handy.

This route was cancelled 3.8% of the time. Typical for U.S. flights is around 1–2%.

Trending in the right direction.

STS–SAN flights arrived on time 78% of the time over the last three months in the data, compared with 68% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon73%(142 flights)
  • Tue83%(108 flights)
  • Wed85%(116 flights)
  • Thu70%(139 flights)
  • Fri74%(143 flights)
  • Sat81%(111 flights)
  • Sun73%(141 flights)
On-time by departure window
  • 6–9 AM91%(304 flights)
  • 9 AM–12 PM75%(144 flights)
  • 12–3 PM71%(88 flights)
  • 3–6 PM75%(134 flights)
  • 6–9 PM62%(230 flights)
On-time trend by month
82%
May

Jun 70% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%59
July 202585%61
August 202578%71
September 202573%79
October 202583%82
November 202576%80
December 202561%49
January 202678%50
February 202666%44
March 202677%69
April 202675%121
May 202682%135

Keep nerding

Based on 938 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.