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Route Reliability

Seattle → Chicago

SEA–MDW · 1,733 miles · Seattle–Tacoma International Airport to Chicago Midway International Airport

86
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
0 min
Average arrival delay
0.4%
Cancelled
673
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 673 flights. No comparison to make.

What the data says

Morning flights do better here.

SEA–MDW flights departing between 3–6 AM arrived on time 93% of the time, versus 42% between 12–3 PM.

Friday is doing you no favors.

SEA–MDW flights arrived on time 90% of the time on Saturdays. On Fridays: 75%.

Recent months have been rougher.

SEA–MDW flights arrived on time 88% of the time over the last three months in the data, compared with 98% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon83%(97 flights)
  • Tue84%(97 flights)
  • Wed85%(98 flights)
  • Thu76%(98 flights)
  • Fri75%(97 flights)
  • Sat90%(89 flights)
  • Sun80%(91 flights)
On-time by departure window
  • 3–6 AM93%(127 flights)
  • 6–9 AM93%(218 flights)
  • 9 AM–12 PM80%(39 flights)
  • 12–3 PM42%(76 flights)
  • 9 PM–12 AM78%(207 flights)
On-time trend by month
90%
May

Jun 76% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%78
July 202569%85
August 202568%88
September 202571%86
October 202597%33
November 202597%29
December 202594%31
January 2026100%31
February 2026100%28
March 202695%56
April 202680%60
May 202690%62

Same trip, other airports

Keep nerding

Based on 673 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.