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Route Reliability

Salt Lake City → San Antonio

SLC–SAT · 1,087 miles · Salt Lake City International Airport to San Antonio International Airport

87
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
3 min
Average arrival delay
0.9%
Cancelled
1,007
Flights in the data

Data through May 2026.

Delta Air Lines is the only airline in this data on this route, arriving on time 84% of the time across 1,007 flights. No comparison to make.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 86% of the time, against 81% between 6–9 PM.

Skip Thursday if you can.

SLC–SAT flights arrived on time 88% of the time on Tuesdays. On Thursdays: 80%.

Ticking up lately.

SLC–SAT flights arrived on time 86% of the time over the last three months in the data, compared with 82% 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
  • Mon87%(151 flights)
  • Tue88%(150 flights)
  • Wed83%(148 flights)
  • Thu80%(148 flights)
  • Fri83%(148 flights)
  • Sat85%(103 flights)
  • Sun82%(147 flights)
On-time by departure window
  • 9 AM–12 PM86%(361 flights)
  • 12–3 PM86%(276 flights)
  • 3–6 PM83%(54 flights)
  • 6–9 PM81%(304 flights)
On-time trend by month
85%
May

Jun 84% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202584%83
July 202573%88
August 202587%82
September 202584%76
October 202594%84
November 202583%77
December 202586%84
January 202679%86
February 202682%78
March 202692%88
April 202681%84
May 202685%85

Keep nerding

Based on 1,007 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.