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Route Reliability

Ontario → Chicago

ONT–MDW · 1,706 miles · Ontario International Airport to Chicago Midway International Airport

95
Nerd Approved
WanderNerd Reliability Score
91%
Arrive within 15 minutes
3 min early
Average arrival delay
0.3%
Cancelled
360
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 91% of the time across 360 flights. No comparison to make.

What the data says

The 6–9 AM departure wins.

ONT–MDW flights departing between 6–9 AM arrived on time 93% of the time, versus 77% between 3–6 AM.

Wednesday is the weak spot.

ONT–MDW flights arrived on time 96% of the time on Sundays. On Wednesdays: 87%.

It basically never cancels.

Out of 360 scheduled flights, only 0.3% were cancelled.

Ticking up lately.

ONT–MDW flights arrived on time 92% of the time over the last three months in the data, compared with 88% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon87%(52 flights)
  • Tue94%(51 flights)
  • Wed87%(52 flights)
  • Thu90%(52 flights)
  • Fri94%(51 flights)
  • Sat87%(46 flights)
  • Sun96%(53 flights)
On-time by departure window
  • 3–6 AM77%(26 flights)
  • 6–9 AM93%(200 flights)
  • 9 AM–12 PM89%(36 flights)
  • 12–3 PM—(8 flights)
  • 9 PM–12 AM92%(87 flights)
On-time trend by month
97%
May

Jun 83% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202584%31
August 202593%30
September 202597%30
October 2025100%31
November 202590%29
December 202587%31
January 202689%27
February 202689%27
March 202694%31
April 202686%29
May 202697%31

Same trip, other airports

Keep nerding

Based on 360 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.