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Route Reliability

Chicago → Ontario

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

74
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
14 min
Average arrival delay
1.1%
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 72% of the time across 360 flights. No comparison to make.

What the data says

The 12–3 PM departure wins.

MDW–ONT flights departing between 12–3 PM arrived on time 85% of the time, versus 44% between 9 PM–12 AM.

Sunday scaries are real for this one.

MDW–ONT flights arrived on time 79% of the time on Wednesdays and just 62% on Sundays. That gap is worth planning around.

Recent months have been rougher.

MDW–ONT flights arrived on time 65% of the time over the last three months in the data, compared with 77% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon76%(50 flights)
  • Tue73%(52 flights)
  • Wed79%(52 flights)
  • Thu79%(52 flights)
  • Fri69%(52 flights)
  • Sat67%(46 flights)
  • Sun62%(52 flights)
On-time by departure window
  • 6–9 AM85%(113 flights)
  • 9 AM–12 PM68%(87 flights)
  • 12–3 PM85%(47 flights)
  • 3–6 PM64%(50 flights)
  • 6–9 PM54%(43 flights)
  • 9 PM–12 AM44%(16 flights)
On-time trend by month
55%
May

Jun 63% → May 55% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%30
July 202561%31
August 202570%30
September 202577%30
October 202577%31
November 202596%28
December 202565%31
January 202678%27
February 202689%27
March 202667%30
April 202673%30
May 202655%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.