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Route Reliability

Chicago → San Francisco

MDW–SFO · 1,855 miles · Chicago Midway International Airport to San Francisco International Airport

50
A Little Dicey
WanderNerd Reliability Score
55%
Arrive within 15 minutes
23 min
Average arrival delay
1.4%
Cancelled
425
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 55% of the time across 425 flights. No comparison to make.

What the data says

Morning-you made the right choice.

MDW–SFO flights departing between 6–9 AM arrived on time 75% of the time, versus 34% between 9 PM–12 AM.

Wednesdays have been rough.

MDW–SFO flights arrived on time 67% of the time on Saturdays and just 47% on Wednesdays. That gap is worth planning around.

Recent months have been rougher.

MDW–SFO flights arrived on time 35% of the time over the last three months in the data, compared with 71% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon52%(60 flights)
  • Tue54%(56 flights)
  • Wed47%(55 flights)
  • Thu59%(59 flights)
  • Fri48%(62 flights)
  • Sat67%(63 flights)
  • Sun54%(63 flights)
On-time by departure window
  • 6–9 AM75%(96 flights)
  • 9 AM–12 PM50%(125 flights)
  • 12–3 PM57%(88 flights)
  • 3–6 PM63%(24 flights)
  • 6–9 PM—(8 flights)
  • 9 PM–12 AM34%(77 flights)
On-time trend by month
21%
May

Jun 60% → May 21% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%30
July 202560%30
August 202581%31
September 202580%30
October 202563%30
November 202572%29
December 202558%31
January 202671%14
February 202684%19
March 202657%53
April 202627%59
May 202621%62

Same trip, other airports

Keep nerding

Based on 425 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.