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Route Reliability

Denver → San Antonio

DEN–SAT · 794 miles · Denver International Airport to San Antonio International Airport

83
Pretty Reliable
WanderNerd Reliability Score
77%
Arrive within 15 minutes
8 min
Average arrival delay
0.3%
Cancelled
3,015
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines81%1,224 flights
  2. 2.Frontier Airlines80%357 flights
  3. 3.Southwest Airlines73%1,434 flights

What the data says

Morning flights do better here.

DEN–SAT flights departing between 6–9 AM arrived on time 90% of the time, versus 58% between 6–9 PM.

Thursday is the weak spot.

DEN–SAT flights arrived on time 83% of the time on Wednesdays. On Thursdays: 72%.

United Airlines runs this route best.

United Airlines arrived on time 81% of the time on this route; Southwest Airlines managed 73%.

It basically never cancels.

Out of 3,015 scheduled flights, only 0.3% were cancelled.

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
  • Mon78%(447 flights)
  • Tue78%(397 flights)
  • Wed83%(385 flights)
  • Thu72%(463 flights)
  • Fri74%(455 flights)
  • Sat82%(408 flights)
  • Sun76%(445 flights)
On-time by departure window
  • 3–6 AM90%(19 flights)
  • 6–9 AM90%(306 flights)
  • 9 AM–12 PM87%(633 flights)
  • 12–3 PM85%(680 flights)
  • 3–6 PM70%(780 flights)
  • 6–9 PM58%(461 flights)
  • 9 PM–12 AM67%(121 flights)
On-time trend by month
80%
May

Jun 63% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%262
July 202558%278
August 202576%235
September 202582%220
October 202584%252
November 202588%242
December 202577%281
January 202680%224
February 202686%193
March 202674%298
April 202685%249
May 202680%266

Keep nerding

Based on 3,015 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.