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Route Reliability

Chicago → San Antonio

MDW–SAT · 1,036 miles · Chicago Midway International Airport to San Antonio International Airport

82
Pretty Reliable
WanderNerd Reliability Score
79%
Arrive within 15 minutes
5 min
Average arrival delay
1.0%
Cancelled
685
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 79% of the time across 685 flights. No comparison to make.

What the data says

Morning-you made the right choice.

MDW–SAT flights departing between 6–9 AM arrived on time 87% of the time, versus 68% between 9 PM–12 AM.

Skip Monday if you can.

MDW–SAT flights arrived on time 86% of the time on Wednesdays. On Mondays: 72%.

Slipping a little lately.

MDW–SAT flights arrived on time 78% of the time over the last three months in the data, compared with 82% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon72%(104 flights)
  • Tue73%(94 flights)
  • Wed86%(94 flights)
  • Thu82%(103 flights)
  • Fri78%(103 flights)
  • Sat83%(82 flights)
  • Sun78%(97 flights)
On-time by departure window
  • 6–9 AM87%(237 flights)
  • 9 AM–12 PM82%(108 flights)
  • 12–3 PM—(8 flights)
  • 3–6 PM71%(76 flights)
  • 6–9 PM81%(89 flights)
  • 9 PM–12 AM68%(159 flights)
On-time trend by month
76%
May

Jun 68% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%71
July 202571%73
August 202578%60
September 202588%56
October 202589%62
November 202584%55
December 202575%60
January 202675%36
February 202696%28
March 202684%55
April 202675%59
May 202676%62

Same trip, other airports

Keep nerding

Based on 685 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.