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Route Reliability

San Antonio → Chicago

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

85
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
5 min
Average arrival delay
0.9%
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 82% of the time across 685 flights. No comparison to make.

What the data says

Morning-you made the right choice.

SAT–MDW flights departing between 3–6 AM arrived on time 94% of the time, versus 66% between 3–6 PM.

Sunday scaries are real for this one.

SAT–MDW flights arrived on time 88% of the time on Saturdays and just 70% on Sundays. That gap is worth planning around.

Flights on this route

The breakdown

On-time by weekday
  • Mon84%(104 flights)
  • Tue83%(95 flights)
  • Wed85%(94 flights)
  • Thu78%(103 flights)
  • Fri85%(104 flights)
  • Sat88%(81 flights)
  • Sun70%(96 flights)
On-time by departure window
  • 3–6 AM94%(89 flights)
  • 6–9 AM94%(130 flights)
  • 9 AM–12 PM88%(113 flights)
  • 12–3 PM72%(184 flights)
  • 3–6 PM66%(119 flights)
  • 6–9 PM83%(42 flights)
On-time trend by month
81%
May

Jun 92% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202592%71
July 202589%73
August 202585%60
September 202586%56
October 202589%62
November 202585%54
December 202573%60
January 202683%36
February 202661%28
March 202655%56
April 202685%59
May 202681%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.