Route Reliability

Airport reliability

Chicago (MDW) on-time performance

How reliably flights leave Chicago, IL (MDW) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

Chicago, IL73,750 departures in 12 months

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Three-letter airport codes, nonstop U.S. domestic flights. One direction at a time.

Departures on time
72.9%
U.S. average 75.6%
Cancelled
1.5%
U.S. average 1.9%
60+ minutes late
7.4%
U.S. average 8.1%
Scheduled departures
73,750
12 months

What this means

MDW departures ran below the U.S. average.

  • 72.9% of the 73,750 scheduled departures from Chicago (MDW) arrived at their destination on time, 2.7 points lower than the U.S. average of 75.6%.
  • 1.5% of departures were cancelled (U.S. average 1.9%), and 7.4% arrived an hour or more late.
  • Flights arriving at MDW were on time 74.8% of the time.
  • Among airlines with at least 300 departures, Delta Air Lines was the most punctual from MDW (84.0%) and Frontier Airlines the least (70.5%).
  • Over the last 3 years, February was the most reliable month for departures from MDW (83.7% on time) and July the least reliable (66.1%).
  • Cancellations peaked in January, when 4.4% of flights were cancelled.
  • Flights scheduled to depart before 6 am were the most punctual (92.3% on time); flights scheduled to depart 10 pm to 11 pm were the least (50.3%).

Airlines at MDW

Ranked by on-time arrival

Departures from MDW, September 2025 to August 2026. On time means arrived at the destination within 15 minutes of schedule.
AirlineOn timeCancelled 60+ min lateAvg delay when lateDepartures
Delta Air Lines 84.0%2.7% 5.4%95 min 1,359
SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska 79.6%1.3% 7.8%87 min 849
Southwest Airlines 72.6%1.5% 7.4%55 min 69,564
Allegiant Air 71.4%0.3% 11.4%122 min 308
Frontier Airlines 70.5%2.3% 11.0%83 min 1,670

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On-time rate by departure hour

<6a 92.3%
6a 87.0%
7a 86.6%
8a 85.1%
9a 83.0%
10a 78.9%
11a 71.7%
12p 73.9%
1p 75.7%
2p 67.9%
3p 68.5%
4p 65.3%
5p 62.3%
6p 62.6%
7p 62.5%
8p 64.5%
9p 54.5%
10p 50.3%
Share of scheduled flights on time MDW average 72.9%
Departures from MDW by scheduled local departure hour, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing before 6 am 92.3% 2,416
Departing 6 am to 7 am 87.0% 2,896
Departing 7 am to 8 am 86.6% 5,726
Departing 8 am to 9 am 85.1% 5,218
Departing 9 am to 10 am 83.0% 4,635
Departing 10 am to 11 am 78.9% 6,777
Departing 11 am to noon 71.7% 3,109
Departing noon to 1 pm 73.9% 4,633
Departing 1 pm to 2 pm 75.7% 5,271
Departing 2 pm to 3 pm 67.9% 3,520
Departing 3 pm to 4 pm 68.5% 3,014
Departing 4 pm to 5 pm 65.3% 2,682
Departing 5 pm to 6 pm 62.3% 4,223
Departing 6 pm to 7 pm 62.6% 6,245
Departing 7 pm to 8 pm 62.5% 3,761
Departing 8 pm to 9 pm 64.5% 4,474
Departing 9 pm to 10 pm 54.5% 4,431
Departing 10 pm to 11 pm 50.3% 719

Best and worst months at MDW

Jan 74.9%
Feb 83.7%
Mar 74.8%
Apr 79.2%
May 72.2%
Jun 67.0%
Jul 66.1%
Aug 72.5%
Sep 81.2%
Oct 82.2%
Nov 83.3%
Dec 76.5%
Share of scheduled flights on time 12-month average 72.9%
Departures from MDW by calendar month, September 2023 to August 2026 pooled. Scale starts at zero.
Show as table
PeriodOn timeFlights
January 74.9% 15,923
February 83.7% 14,514
March 74.8% 19,298
April 79.2% 19,124
May 72.2% 19,370
June 67.0% 21,661
July 66.1% 22,694
August 72.5% 20,667
September 81.2% 20,417
October 82.2% 20,933
November 83.3% 18,266
December 76.5% 18,523

Month by month, last 12 months

Sep 83.8%
Oct 79.9%
Nov 76.5%
Dec 69.3%
Jan 79.1%
Feb 80.7%
Mar 65.9%
Apr 76.6%
May 73.6%
Jun 62.9%
Jul 67.0%
Aug 65.1%
Share of scheduled flights on time U.S. average 75.6%
Departures from MDW, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Sep 2025 83.8% 6,459
Oct 2025 79.9% 6,536
Nov 2025 76.5% 5,620
Dec 2025 69.3% 5,738
Jan 2026 79.1% 4,848
Feb 2026 80.7% 4,537
Mar 2026 65.9% 6,508
Apr 2026 76.6% 6,282
May 2026 73.6% 6,269
Jun 2026 62.9% 6,937
Jul 2026 67.0% 7,279
Aug 2026 65.1% 6,737

Busiest routes from MDW

Nonstop routes from MDW by scheduled flights, September 2025 to August 2026.
ToOn timeCancelledAirlinesFlights
Atlanta (ATL) 76.8%2.0%33,538
Phoenix (PHX) 73.4%1.6%22,719
Orlando (MCO) 73.5%1.6%22,707
New York (LGA) 64.2%4.5%12,391
Minneapolis (MSP) 75.5%1.8%22,275
Denver (DEN) 71.6%1.3%22,259
Las Vegas (LAS) 75.2%0.9%22,236
Dallas (DAL) 74.2%2.0%12,204
Kansas City (MCI) 76.8%1.4%12,108
Washington (DCA) 66.9%2.0%12,100
Nashville (BNA) 78.1%1.4%11,873
Houston (HOU) 72.4%1.2%11,849
Baltimore (BWI) 75.4%2.7%21,843
St. Louis (STL) 79.4%1.2%11,701
Tampa (TPA) 75.3%1.3%21,569
Philadelphia (PHL) 73.1%1.7%21,513
Austin (AUS) 75.0%0.9%11,374
Boston (BOS) 65.0%1.3%11,368
Omaha (OMA) 73.6%1.1%11,316
Los Angeles (LAX) 67.4%0.9%11,296
Airliner parked at a terminal gate
Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source
U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period
September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through
August 2026
Processed
2026-11-03
Scope
Scheduled nonstop domestic departures from Chicago, IL (MDW) by airlines that report to the DOT.
Method
Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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