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Route Reliability

Chicago → St. Louis

MDW–STL · 251 miles · Chicago Midway International Airport to St. Louis Lambert International Airport

87
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
2 min
Average arrival delay
0.9%
Cancelled
1,705
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 83% of the time across 1,705 flights. No comparison to make.

What the data says

Morning flights do better here.

MDW–STL flights departing between 3–6 AM arrived on time 100% of the time, versus 64% between 9 PM–12 AM.

Sunday scaries are real for this one.

MDW–STL flights arrived on time 88% of the time on Wednesdays. On Sundays: 76%.

Slipping a little lately.

MDW–STL flights arrived on time 80% of the time over the last three months in the data, compared with 85% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon80%(258 flights)
  • Tue86%(263 flights)
  • Wed88%(259 flights)
  • Thu82%(255 flights)
  • Fri84%(254 flights)
  • Sat83%(162 flights)
  • Sun76%(237 flights)
On-time by departure window
  • 3–6 AM100%(50 flights)
  • 6–9 AM94%(378 flights)
  • 9 AM–12 PM91%(348 flights)
  • 12–3 PM84%(284 flights)
  • 3–6 PM68%(212 flights)
  • 6–9 PM74%(258 flights)
  • 9 PM–12 AM64%(158 flights)
On-time trend by month
80%
May

Jun 80% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%161
July 202572%167
August 202584%153
September 202593%151
October 202587%130
November 202586%123
December 202580%138
January 202686%120
February 202689%110
March 202675%132
April 202685%149
May 202680%154

Same trip, other airports

Keep nerding

Based on 1,705 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.